/* ========================================
   S-OPTO — Industrial Factory Theme
   工业工厂风格：深蓝主色 + 橙黄强调 + 硬朗线条
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&display=swap');

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Industrial palette — 工厂工业配色 */
    --bg: #f4f6f8;
    --bg-alt: #e9edf1;
    --surface: #ffffff;
    --surface-dark: #1e3a5f;
    --text: #1a2332;
    --text-muted: #5a6b82;
    --text-light: #8fa0b8;
    --primary: #1e3a5f;
    --primary-light: #2d5a8c;
    --primary-bg: #e8f0fa;
    --primary-dark: #0f2744;
    --accent: #f59e0b;
    --accent-dark: #d97706;
    --accent-light: #fbbf24;
    --border: #d1d9e4;
    --border-dark: #a8b6c8;
    --success: #059669;
    --error: #dc2626;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    font-weight: 400;
}

/* Typography — 工业硬朗风格 */
h1, h2, h3, h4, h5 {
    font-family: 'Oswald', sans-serif;
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    color: var(--primary);
}

.serif {
    font-family: 'Oswald', sans-serif;
}

.sans {
    font-family: 'Inter', sans-serif;
}

h1 { font-size: 3.5rem; font-weight: 700; }
h2 { font-size: 2.5rem; font-weight: 600; }
h3 { font-size: 1.75rem; font-weight: 600; }
h4 { font-size: 1.25rem; font-weight: 600; }
h5 { font-size: 1rem; font-weight: 600; }

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Utility classes */
.w-5 { width: 20px; }
.h-5 { height: 20px; }
.mr-2 { margin-right: 8px; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.fixed { position: fixed; }
.bottom-6 { bottom: 24px; }
.right-6 { right: 24px; }
.z-50 { z-index: 50; }

/* ========================================
   Navigation — Industrial
   工业风格导航：深蓝顶栏 + 硬朗线条
   ======================================== */
header {
    background: var(--primary);
    border-bottom: 3px solid var(--accent);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 40px;
}

.logo {
    font-family: 'Oswald', sans-serif;
    font-size: 26px;
    font-weight: 700;
    color: #ffffff;
    text-decoration: none;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.logo:hover {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    transition: all 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}

.nav-links a:hover {
    color: #ffffff;
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-links .nav-cta {
    color: var(--primary);
    background: var(--accent);
    padding: 10px 22px;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
}

.nav-links .nav-cta::after {
    display: none;
}

.nav-links .nav-cta:hover {
    background: var(--accent-dark);
    color: var(--primary-dark);
    transform: translateY(-1px);
}

.lang-switcher select {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    outline: none;
    padding: 6px 10px;
}

.lang-switcher select:focus {
    color: #ffffff;
    border-color: var(--accent);
}

.lang-switcher select option {
    background: var(--primary);
    color: #ffffff;
}

/* Mobile menu */
.mobile-menu {
    display: none;
    background: none;
    border: none;
    color: #ffffff;
    font-size: 24px;
    cursor: pointer;
}

.mobile-nav {
    display: none;
    background: var(--primary-dark);
    padding: 20px 40px;
    border-top: 2px solid var(--accent);
}

.mobile-nav a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 16px 0;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-nav a:hover {
    color: var(--accent);
}

/* ========================================
   Hero — Industrial Factory Style
   工业风格Hero：深蓝渐变背景 + 几何线条
   ======================================== */
.hero {
    padding: 100px 40px 140px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    color: #ffffff;
}

/* 工业装饰网格线 */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

/* 装饰条 */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--accent);
}

.hero-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-dark);
    background: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 32px;
    padding: 8px 16px;
}

.hero h1 {
    font-size: clamp(42px, 6vw, 80px);
    line-height: 1.1;
    margin-bottom: 32px;
    color: #ffffff;
    font-weight: 700;
}

.hero h1 em {
    font-style: normal;
    color: var(--accent);
}

.hero-desc {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.75);
    max-width: 520px;
    margin-bottom: 48px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 20px;
    align-items: center;
}

/* Buttons — Industrial style */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 36px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: 'Inter', sans-serif;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--accent);
    color: var(--primary-dark);
    clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.3);
}

.btn-outline {
    background: transparent;
    color: #ffffff;
    border: 2px solid rgba(255, 255, 255, 0.4);
    clip-path: polygon(12px 0, 100% 0, 100% 100%, 0 100%, 0 12px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
    color: var(--accent);
}

/* Hero visual — industrial gear style */
.hero-visual {
    position: relative;
    height: 550px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-circle {
    position: absolute;
    width: 450px;
    height: 450px;
    border: 3px solid rgba(245, 158, 11, 0.3);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
}

.hero-circle::before {
    content: '';
    position: absolute;
    inset: 50px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
}

.hero-number {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: 'Oswald', sans-serif;
    font-size: 160px;
    font-weight: 700;
    color: rgba(245, 158, 11, 0.2);
    line-height: 1;
    letter-spacing: 0.05em;
}

/* ========================================
   Stats — Industrial Strip
   工厂数据统计条：深蓝底色 + 橙色数字
   ======================================== */
.stats-strip {
    background: var(--primary-dark);
    color: #ffffff;
    padding: 56px 40px;
    position: relative;
    border-top: 4px solid var(--accent);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.stats-strip::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 80px 100%;
    pointer-events: none;
}

.stats-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    position: relative;
    z-index: 2;
}

.stat-item {
    text-align: left;
    position: relative;
    padding-left: 24px;
    border-left: 3px solid var(--accent);
}

.stat-number {
    font-family: 'Oswald', sans-serif;
    font-size: 52px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}

.stat-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 500;
}

/* ========================================
   Section — Industrial Layout
   工业风格分区：硬朗线条 + 几何装饰
   ======================================== */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    margin-bottom: 70px;
    position: relative;
}

.section-label {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: var(--accent-dark);
    background: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 20px;
    padding: 6px 14px;
}

.section-title {
    font-size: clamp(32px, 4.5vw, 56px);
    line-height: 1.15;
    margin-bottom: 20px;
    max-width: 800px;
    color: var(--primary);
}

.section-desc {
    font-size: 17px;
    color: var(--text-muted);
    max-width: 600px;
    line-height: 1.8;
}

/* ========================================
   Categories — Industrial Cards
   工业风格分类卡片：硬朗边框 + 几何装饰
   ======================================== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.cat-card {
    background: var(--surface);
    padding: 56px 48px;
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
    border: 2px solid var(--border);
    border-left: 6px solid var(--primary);
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.cat-card:hover {
    border-color: var(--accent);
    border-left-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(30, 58, 95, 0.12);
}

.cat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary) 0%, transparent 60%);
    opacity: 0.06;
    transition: all 0.4s;
}

.cat-card:hover::before {
    opacity: 0.12;
    width: 160px;
    height: 160px;
}

.cat-card::after {
    content: '';
    position: absolute;
    bottom: 24px;
    left: 48px;
    right: 48px;
    height: 1px;
    background: var(--border);
}

.cat-num {
    font-family: 'Oswald', sans-serif;
    font-size: 64px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 20px;
    letter-spacing: 0.02em;
}

.cat-card h3 {
    font-size: 28px;
    margin-bottom: 14px;
    font-weight: 600;
    position: relative;
    z-index: 2;
}

.cat-card p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 28px;
    position: relative;
    z-index: 2;
}

.cat-link {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s;
    position: relative;
    z-index: 2;
    padding: 10px 0;
}

.cat-link::after {
    content: '';
    display: inline-block;
    width: 24px;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s;
}

.cat-link:hover {
    color: var(--accent-dark);
    gap: 14px;
}

.cat-link:hover::after {
    width: 36px;
}

/* ========================================
   Advantages — Industrial Numbered List
   工业风格优势列表：硬朗线条 + 几何编号
   ======================================== */
.advantages-section {
    background: var(--bg-alt);
    position: relative;
}

.advantages-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(rgba(30, 58, 95, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 58, 95, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.adv-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    position: relative;
    z-index: 2;
}

.adv-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 40px;
    padding: 44px 0;
    border-bottom: 2px solid var(--border);
    align-items: start;
    transition: all 0.3s;
    position: relative;
}

.adv-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.4s;
    transform: translateY(-50%);
}

.adv-item:hover::before {
    width: 60px;
}

.adv-item:last-child {
    border-bottom: none;
}

.adv-num {
    font-family: 'Oswald', sans-serif;
    font-size: 72px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    letter-spacing: 0.02em;
    position: relative;
    padding-left: 24px;
    border-left: 4px solid var(--accent);
}

.adv-content h4 {
    font-size: 26px;
    margin-bottom: 12px;
    font-weight: 600;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
    display: inline-block;
}

.adv-content p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.75;
    max-width: 650px;
}

/* ========================================
   Products — Industrial Tech Cards
   工业风格产品卡片：专业技术感 + 硬朗边框
   ======================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.prod-card {
    background: var(--surface);
    border: 2px solid var(--border);
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.prod-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
    z-index: 3;
    transition: background 0.3s;
}

.prod-card:hover {
    border-color: var(--accent);
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(30, 58, 95, 0.15);
}

.prod-card:hover::before {
    background: var(--accent);
}

.prod-visual {
    height: 220px;
    background: var(--bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border);
}

.prod-visual::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(30, 58, 95, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 58, 95, 0.04) 1px, transparent 1px);
    background-size: 30px 30px;
}

.prod-visual::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 24px;
    right: 24px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border), transparent);
}

.prod-icon {
    font-size: 56px;
    position: relative;
    z-index: 1;
    color: var(--primary);
    transition: transform 0.4s;
}

.prod-card:hover .prod-icon {
    transform: scale(1.1) rotate(-5deg);
}

/* 产品图片样式 */
.prod-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    z-index: 1;
    transition: transform 0.5s ease;
}

.prod-card:hover .prod-img {
    transform: scale(1.08);
}

.prod-body {
    padding: 24px 24px 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}

.prod-body::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 24px;
    width: 40px;
    height: 3px;
    background: var(--accent);
    transition: width 0.4s;
}

.prod-card:hover .prod-body::after {
    width: 80px;
}

.prod-body h5 {
    font-family: 'Oswald', sans-serif;
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    line-height: 1.3;
    min-height: 46px;
    letter-spacing: 0.01em;
}

.prod-model {
    font-size: 12px;
    color: var(--accent-dark);
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.prod-link {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s;
    margin-top: auto;
}

.prod-link::after {
    content: '→';
    font-size: 14px;
    transition: transform 0.3s;
}

.prod-link:hover {
    color: var(--accent-dark);
    gap: 14px;
}

.prod-link:hover::after {
    transform: translateX(4px);
}

/* ========================================
   Filter Bar — Industrial Style
   工业风格筛选栏：硬朗边框 + 几何装饰
   ======================================== */
.filter-bar {
    margin-bottom: 56px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-top: 4px solid var(--primary);
    position: relative;
}

.filter-bar::before {
    content: '';
    position: absolute;
    top: -4px;
    right: 0;
    width: 120px;
    height: 4px;
    background: var(--accent);
}

/* 筛选顶部栏：分类 + 搜索 + 清除 */
.filter-header {
    display: flex;
    gap: 16px;
    padding: 28px 32px;
    border-bottom: 2px solid var(--border);
    align-items: center;
    flex-wrap: wrap;
    background: var(--bg-alt);
}

.filter-header select,
.filter-header input {
    padding: 12px 18px;
    background: var(--surface);
    border: 2px solid var(--border);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    outline: none;
    transition: all 0.25s;
    border-radius: 0;
    min-width: 200px;
    font-weight: 500;
}

.filter-header select:focus,
.filter-header input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.filter-search {
    flex: 1;
    min-width: 200px;
}

.filter-clear-btn {
    padding: 12px 24px;
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.filter-clear-btn:hover {
    background: var(--primary);
    color: var(--surface);
    transform: translateY(-1px);
}

/* 已选筛选标签 */
.filter-active-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 18px 32px;
    background: var(--primary-dark);
    border-bottom: 2px solid var(--border);
    align-items: center;
}

.filter-active-tags:empty {
    display: none;
}

.filter-active-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-right: 8px;
    font-family: 'Oswald', sans-serif;
}

.filter-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--accent);
    color: var(--primary-dark);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.filter-tag-close {
    background: none;
    border: none;
    color: var(--primary-dark);
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    padding: 0;
    opacity: 0.7;
    transition: all 0.2s;
    font-weight: 700;
}

.filter-tag-close:hover {
    opacity: 1;
    transform: scale(1.2);
}

/* 筛选分组区域 */
.filter-groups {
    padding: 32px;
}

.filter-group {
    margin-bottom: 28px;
}

.filter-group:last-child {
    margin-bottom: 0;
}

.filter-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
    position: relative;
    font-family: 'Oswald', sans-serif;
}

.filter-label::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 50px;
    height: 2px;
    background: var(--accent);
}

.filter-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 10px;
}

.filter-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: var(--bg);
    border: 2px solid var(--border);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.25s;
    user-select: none;
    font-weight: 500;
    position: relative;
}

.filter-option:hover {
    border-color: var(--primary);
    background: var(--surface);
    transform: translateY(-1px);
}

.filter-option input[type="checkbox"] {
    margin: 0;
    cursor: pointer;
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.filter-option:has(input:checked) {
    background: var(--primary);
    color: var(--surface);
    border-color: var(--primary);
}

.filter-option:has(input:checked):hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--primary-dark);
}

/* ========================================
   Product Section Title — Industrial
   工业风格产品标题
   ======================================== */
.prod-section-title {
    font-size: 36px;
    margin-bottom: 40px;
    padding-bottom: 16px;
    border-bottom: 3px solid var(--primary);
    position: relative;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.prod-section-title::before {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 80px;
    height: 3px;
    background: var(--accent);
    z-index: 1;
}

.prod-section-title::after {
    content: '';
    position: absolute;
    bottom: 20px;
    left: -20px;
    width: 8px;
    height: 40px;
    background: var(--accent);
}

/* ========================================
   Product Filter Bar — Industrial Dropdown
   工厂风格下拉筛选栏
   ======================================== */
.product-filter-bar {
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 4px solid var(--primary);
    padding: 24px 30px;
    margin-bottom: 40px;
    position: relative;
}

/* 右上角工业装饰块 */
.product-filter-bar::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 80px;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(245, 158, 11, 0.06));
    pointer-events: none;
}

/* 左侧橙色竖条装饰 */
.product-filter-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
}

.pfb-title {
    font-family: 'Oswald', sans-serif;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
    position: relative;
}

.pfb-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent);
}

.pfb-selects {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-end;
}

.pfb-select-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
    min-width: 150px;
    max-width: 220px;
}

.pfb-select-item.pfb-action {
    flex: 0 0 auto;
    min-width: auto;
    max-width: none;
    flex-direction: row;
    align-items: flex-end;
    gap: 10px;
}

.pfb-select-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.pfb-select {
    width: 100%;
    padding: 12px 40px 12px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    outline: none;
    transition: all 0.2s;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M6 8L0 0h12z' fill='%231e3a5f'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 12px 8px;
    border-radius: 0;
}

.pfb-select:hover {
    border-color: var(--primary-light);
}

.pfb-select:focus {
    border-color: var(--primary);
    background-color: var(--surface);
}

.pfb-submit-btn {
    padding: 12px 28px;
    background: var(--primary);
    color: #ffffff;
    border: none;
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all 0.2s;
    clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.pfb-submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.pfb-reset-btn {
    padding: 12px 24px;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    font-family: 'Inter', sans-serif;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all 0.2s;
}

.pfb-reset-btn:hover {
    border-color: var(--accent);
    color: var(--accent-dark);
}

/* ========================================
   Product Category Quick Navigation
   分类快速导航（锚点）
   ======================================== */
.product-cat-nav {
    background: var(--bg-alt);
    border-left: 4px solid var(--accent);
    padding: 16px 24px;
    margin-bottom: 40px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.cat-nav-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    white-space: nowrap;
}

.cat-nav-link {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    text-decoration: none;
    padding: 4px 10px;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.cat-nav-link:hover {
    color: var(--primary);
    border-bottom-color: var(--accent);
}

/* ========================================
   Products by Category — Industrial Table Style
   工厂风格：按分类分组的产品列表（类表格，不用 table）
   ======================================== */
.products-by-category {
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.product-category-block {
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 4px solid var(--primary);
    position: relative;
    overflow: hidden;
}

/* 右上角工业装饰块 */
.product-category-block::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, transparent 50%, var(--accent) 50%);
    opacity: 0.8;
}

.category-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 30px;
    background: var(--bg-alt);
    border-bottom: 2px solid var(--border);
}

.category-block-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.03em;
    margin: 0;
    padding-left: 16px;
    border-left: 4px solid var(--accent);
}

.category-block-count {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: var(--surface);
    padding: 6px 14px;
    border: 1px solid var(--border);
}

/* Table-like grid header */
.product-table-head {
    display: grid;
    grid-template-columns: 200px 1fr 200px;
    background: var(--primary);
    color: #ffffff;
    padding: 14px 30px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.pth-col {
    display: flex;
    align-items: center;
}

.pth-action {
    justify-content: flex-end;
    gap: 16px;
}

/* Table body */
.product-table-body {
    display: flex;
    flex-direction: column;
}

.product-row {
    display: grid;
    grid-template-columns: 200px 1fr 200px;
    padding: 18px 30px;
    border-bottom: 1px solid var(--border);
    align-items: center;
    transition: all 0.2s;
    position: relative;
}

.product-row:last-child {
    border-bottom: none;
}

.product-row:hover {
    background: var(--bg-alt);
}

.product-row::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent);
    opacity: 0;
    transition: opacity 0.2s;
}

.product-row:hover::before {
    opacity: 1;
}

.pr-col {
    display: flex;
    align-items: center;
}

.pr-model {
    font-family: 'Oswald', sans-serif;
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.03em;
}

.pr-model-code {
    background: var(--bg-alt);
    padding: 4px 10px;
    border-left: 3px solid var(--accent);
}

.product-row:hover .pr-model-code {
    background: var(--surface);
}

.pr-name-text {
    font-size: 14px;
    color: var(--text);
    line-height: 1.5;
}

.pr-action {
    justify-content: flex-end;
    gap: 10px;
}

.pr-detail-btn {
    display: inline-block;
    padding: 7px 16px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    border: 1px solid var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.2s;
}

.pr-detail-btn:hover {
    background: var(--primary);
    color: #ffffff;
}

.pr-inquiry-btn {
    display: inline-block;
    padding: 7px 16px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-dark);
    background: var(--accent);
    border: 1px solid var(--accent);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
}

.pr-inquiry-btn:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
}

/* "查看更多"链接 */
.category-more-link-wrap {
    padding: 18px 30px;
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    text-align: right;
}

.category-more-link {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-bottom: 4px;
    border-bottom: 2px solid var(--accent);
    transition: all 0.2s;
}

.category-more-link:hover {
    color: var(--accent-dark);
    border-bottom-color: var(--primary);
}

/* ========================================
   Pagination — Industrial Style
   工厂风格分页
   ======================================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 2px solid var(--border);
}

.page-btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    background: var(--surface);
    border: 2px solid var(--primary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    transition: all 0.2s;
    position: relative;
}

.page-btn:hover {
    background: var(--primary);
    color: #ffffff;
}

.page-prev {
    clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-next {
    clip-path: polygon(10px 0, 100% 0, 100% 100%, 0 100%);
}

.page-info {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Oswald', sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.page-current {
    font-size: 28px;
    color: var(--primary);
}

.page-sep {
    font-weight: 400;
}

/* ========================================
   CTA — Industrial Statement
   工业风格CTA：深蓝渐变 + 橙色按钮
   ======================================== */
.cta-section {
    padding: 140px 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    color: #ffffff;
    text-align: center;
    position: relative;
    overflow: hidden;
    border-top: 4px solid var(--accent);
    border-bottom: 4px solid var(--accent);
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.cta-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--accent);
}

.cta-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 40px;
    position: relative;
    z-index: 2;
}

.cta-content h2 {
    font-size: clamp(36px, 5vw, 72px);
    margin-bottom: 24px;
    color: #ffffff;
    font-weight: 700;
    line-height: 1.1;
}

.cta-content h2 em {
    font-style: normal;
    color: var(--accent);
}

.cta-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.75);
    margin-bottom: 48px;
    line-height: 1.8;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-content .btn {
    background: var(--accent);
    color: var(--primary-dark);
    font-weight: 700;
    padding: 18px 48px;
    font-size: 14px;
    clip-path: polygon(0 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}

.cta-content .btn:hover {
    background: var(--accent-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(245, 158, 11, 0.4);
}

/* ========================================
   Footer — Industrial Style
   工业风格页脚：深蓝底色 + 硬朗线条
   ======================================== */
footer {
    background: var(--primary-dark);
    border-top: 4px solid var(--accent);
    color: rgba(255, 255, 255, 0.7);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 4px;
    left: 0;
    right: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    pointer-events: none;
}

.footer-main {
    padding: 60px 0 40px;
    position: relative;
    z-index: 2;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 50px;
}

.footer-col-title {
    font-size: 14px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 24px;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    position: relative;
    padding-bottom: 12px;
}

.footer-col-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 3px;
    background: var(--accent);
}

.footer-logo {
    font-family: 'Oswald', sans-serif;
    font-size: 28px;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 13px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 20px;
    font-family: 'Inter', sans-serif;
}

.footer-social {
    display: flex;
    gap: 10px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.25s;
    font-family: 'Inter', sans-serif;
}

.footer-social a:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--primary-dark);
    transform: translateY(-2px);
}

.footer-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-list li {
    margin-bottom: 12px;
}

.footer-list a {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: all 0.25s;
    font-family: 'Inter', sans-serif;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    position: relative;
    padding-left: 12px;
}

.footer-list a::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
    transition: transform 0.25s;
}

.footer-list a:hover {
    color: var(--accent);
    padding-left: 16px;
}

.footer-list a:hover::before {
    transform: translateX(2px);
}

.footer-contact-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-contact-list li {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    align-items: flex-start;
}

.fci-icon {
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-contact-list a,
.footer-contact-list span {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    line-height: 1.6;
    font-family: 'Inter', sans-serif;
    transition: color 0.25s;
}

.footer-contact-list a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    position: relative;
    z-index: 2;
}

.footer-bottom-inner {
    /* display: flex; */
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copy {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    letter-spacing: 0.02em;
    font-family: 'Inter', sans-serif;
}

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

.footer-bottom-links a {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.25s;
    font-family: 'Inter', sans-serif;
}

.footer-bottom-links a:hover {
    color: var(--accent);
}

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .footer-col-about {
        grid-column: span 2;
    }
}

@media (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-col-about {
        grid-column: span 1;
    }

    .footer-bottom-inner {
        flex-direction: column;
        text-align: center;
    }
}

/* ========================================
   Page Hero — Industrial Subpages
   工业风格页面标题区：深蓝背景 + 几何装饰
   ======================================== */
.page-hero {
    padding: 140px 40px 100px;
    text-align: left;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, var(--primary-light) 100%);
    color: #ffffff;
    position: relative;
    overflow: hidden;
    border-bottom: 4px solid var(--accent);
}

.page-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.page-hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--accent);
}

.page-hero-content {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.page-hero-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: var(--primary-dark);
    background: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 28px;
    padding: 8px 18px;
}

.page-hero h1 {
    font-size: clamp(48px, 7vw, 96px);
    line-height: 0.95;
    margin-bottom: 24px;
    color: #ffffff;
    font-weight: 700;
}

.page-hero h1 em {
    font-style: normal;
    color: var(--accent);
}

.page-hero p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.75);
    max-width: 600px;
    line-height: 1.8;
}

/* ========================================
   About Page
   ======================================== */
.about-story {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    padding: 120px 0;
}

.about-text-block h2 {
    font-size: 48px;
    margin-bottom: 32px;
}

.about-text-block p {
    color: var(--text-muted);
    font-size: 17px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-visual {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.about-stat-card {
    background: var(--bg-alt);
    padding: 40px 32px;
    text-align: left;
}

.about-stat-card .stat-val {
    font-family: 'Playfair Display', serif;
    font-size: 48px;
    font-weight: 900;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 12px;
}

.about-stat-card .stat-desc {
    font-size: 14px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* Scope grid */
.scope-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    background: var(--border);
}

.scope-card {
    background: var(--surface);
    padding: 48px 36px;
}

.scope-card h4 {
    font-size: 24px;
    margin-bottom: 16px;
}

.scope-card p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.7;
}

/* ========================================
   Contact Page — Industrial Style
   工业风格联系页面：硬朗边框 + 几何装饰
   ======================================== */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 0;
    padding: 0;
    border: 2px solid var(--border);
}

.contact-info-panel {
    background: var(--primary);
    padding: 56px 48px;
    color: #ffffff;
    position: relative;
    overflow: hidden;
    border-right: 4px solid var(--accent);
}

.contact-info-panel::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.contact-info-panel::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--accent);
}

.contact-info-panel h3 {
    font-size: 30px;
    margin-bottom: 40px;
    color: #ffffff;
    position: relative;
    z-index: 2;
    padding-bottom: 16px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.15);
}

.contact-info-panel h3::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent);
}

.contact-row {
    display: flex;
    gap: 20px;
    margin-bottom: 32px;
    align-items: flex-start;
    position: relative;
    z-index: 2;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.contact-row:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.contact-row .c-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--accent);
    font-size: 22px;
    flex-shrink: 0;
    color: var(--accent);
}

.contact-row h4 {
    font-family: 'Oswald', sans-serif;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 6px;
    color: var(--accent);
}

.contact-row p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.85);
    margin: 0;
    line-height: 1.6;
}

.contact-row a {
    color: var(--accent-light);
    text-decoration: none;
    transition: color 0.2s;
}

.contact-row a:hover {
    color: #ffffff;
}

/* Form */
.contact-form-panel {
    background: var(--surface);
    padding: 56px 48px;
    border: none;
    position: relative;
}

.contact-form-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.contact-form-panel h3 {
    font-size: 32px;
    margin-bottom: 36px;
    padding-bottom: 16px;
    border-bottom: 3px solid var(--primary);
    position: relative;
}

.contact-form-panel h3::before {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 80px;
    height: 3px;
    background: var(--accent);
    z-index: 1;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.form-group {
    margin-bottom: 24px;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 11px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-family: 'Oswald', sans-serif;
}

.form-group label .req {
    color: var(--accent-dark);
    font-weight: 700;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg);
    border: 2px solid var(--border);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    outline: none;
    transition: all 0.25s;
    border-radius: 0;
    font-weight: 500;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary);
    background: var(--surface);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.08);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.form-submit {
    margin-top: 32px;
}

.form-submit .btn {
    background: var(--primary);
    color: #ffffff;
    padding: 16px 48px;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.1em;
    clip-path: polygon(0 0, 100% 0, calc(100% - 14px) 100%, 0 100%);
    transition: all 0.3s;
}

.form-submit .btn:hover {
    background: var(--accent);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.3);
}

/* Cart badge */
.cart-badge-container {
    position: relative;
    display: inline-flex;
}

.cart-count {
    position: absolute;
    top: -6px;
    right: -6px;
    min-width: 20px;
    height: 20px;
    background-color: var(--accent);
    color: white;
    font-size: 11px;
    font-weight: 600;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 6px;
    box-shadow: 0 2px 4px rgba(220, 38, 38, 0.4);
    font-family: 'DM Sans', sans-serif;
    letter-spacing: 0;
    text-transform: none;
}

/* Cart items in inquiry form */
#cart-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 300px;
    overflow-y: auto;
}

#cart-items .text-center {
    text-align: center;
    padding: 48px 0;
    background: var(--bg-alt);
    border: 2px dashed var(--border);
    border-radius: 0;
}

#cart-items svg {
    width: 64px;
    height: 64px;
    color: var(--text-light);
    margin: 0 auto 16px;
    display: block;
}

#cart-items .text-gray-500 {
    color: var(--text-muted);
    font-size: 16px;
    margin-bottom: 16px;
}

#cart-items a.bg-blue-600 {
    display: inline-block;
    background: var(--text);
    color: var(--surface);
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.3s;
}

#cart-items a.bg-blue-600:hover {
    background: var(--accent);
}

/* Individual cart item */
#cart-items .flex {
    display: flex;
}

#cart-items .items-start {
    align-items: flex-start;
}

#cart-items .bg-gray-50 {
    background: var(--bg-alt);
}

#cart-items .hover\:bg-blue-50:hover {
    background: var(--bg-alt);
}

#cart-items .rounded-xl {
    border-radius: 0;
}

#cart-items .p-4 {
    padding: 16px;
}

#cart-items .transition-colors {
    transition: all 0.3s;
}

#cart-items .border {
    border: 1px solid var(--border);
}

#cart-items .border-gray-100 {
    border-color: var(--border);
}

#cart-items .w-14 {
    width: 56px;
}

#cart-items .h-14 {
    height: 56px;
}

#cart-items .object-cover {
    object-fit: cover;
}

#cart-items .mr-4 {
    margin-right: 16px;
}

#cart-items .flex-1 {
    flex: 1;
}

#cart-items .min-w-0 {
    min-width: 0;
}

#cart-items .font-semibold {
    font-weight: 600;
}

#cart-items .text-gray-800 {
    color: var(--text);
}

#cart-items .mb-1 {
    margin-bottom: 4px;
}

#cart-items .truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#cart-items .text-sm {
    font-size: 14px;
}

#cart-items .text-gray-500 {
    color: var(--text-muted);
}

#cart-items .font-mono {
    font-family: 'DM Sans', sans-serif;
}

#cart-items .ml-4 {
    margin-left: 16px;
}

#cart-items .text-red-500 {
    color: var(--accent);
}

#cart-items .hover\:text-red-700:hover {
    color: var(--accent-dark);
}

#cart-items .hover\:bg-red-50:hover {
    background: var(--bg-alt);
}

#cart-items .font-medium {
    font-weight: 500;
}

#cart-items .px-3 {
    padding-left: 12px;
    padding-right: 12px;
}

#cart-items .py-2 {
    padding-top: 8px;
    padding-bottom: 8px;
}

#cart-items .flex-shrink-0 {
    flex-shrink: 0;
}

#cart-items button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--accent);
    font-family: 'DM Sans', sans-serif;
    font-size: 14px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    transition: all 0.2s;
}

#cart-items button:hover {
    color: var(--accent-dark);
}

#cart-items button svg {
    width: 16px;
    height: 16px;
    margin: 0;
    display: inline;
}

#cart-item-count {
    font-size: 14px;
    color: var(--text-muted);
    font-weight: normal;
    font-family: 'DM Sans', sans-serif;
}

/* ========================================
   FAQ — Industrial Style
   工业风格常见问题：硬朗边框 + 几何装饰
   ======================================== */
.faq-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 60px;
}

.faq-item {
    background: var(--surface);
    padding: 36px 32px;
    border: 2px solid var(--border);
    border-left: 5px solid var(--primary);
    position: relative;
    transition: all 0.3s;
}

.faq-item:hover {
    border-color: var(--accent);
    border-left-color: var(--accent);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(30, 58, 95, 0.1);
}

.faq-item::before {
    content: 'Q';
    position: absolute;
    top: 20px;
    right: 24px;
    font-family: 'Oswald', sans-serif;
    font-size: 48px;
    font-weight: 700;
    color: var(--accent);
    opacity: 0.15;
    line-height: 1;
}

.faq-item h4 {
    font-size: 20px;
    margin-bottom: 14px;
    font-weight: 600;
    padding-right: 40px;
    position: relative;
    z-index: 2;
}

.faq-item p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.75;
    margin: 0;
    position: relative;
    z-index: 2;
}

/* ========================================
   Product Detail Page — Industrial Style
   工业风格产品详情：硬朗边框 + 技术感
   ======================================== */
.product-detail-image div[style*="background"] {
    border: 2px solid var(--border);
    position: relative;
}

.product-detail-image div[style*="background"]::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
    z-index: 2;
}

/* ========================================
   Product Description Content — Industrial
   工业风格产品描述内容
   ======================================== */
.product-description-content {
    color: var(--text);
    font-size: 1rem;
    line-height: 1.75;
    word-wrap: break-word;
}

.product-description-content > *:first-child {
    margin-top: 0 !important;
}

.product-description-content > *:last-child {
    margin-bottom: 0 !important;
}

.product-description-content p {
    margin-bottom: 1rem;
    line-height: 1.75;
    color: var(--text-muted);
}

.product-description-content h1,
.product-description-content h2,
.product-description-content h3,
.product-description-content h4,
.product-description-content h5,
.product-description-content h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--primary);
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
    font-family: 'Oswald', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    position: relative;
    padding-left: 16px;
}

.product-description-content h1::before,
.product-description-content h2::before,
.product-description-content h3::before,
.product-description-content h4::before,
.product-description-content h5::before,
.product-description-content h6::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.25em;
    width: 4px;
    height: 0.8em;
    background: var(--accent);
}

.product-description-content h1 { font-size: 1.875rem; }
.product-description-content h2 { font-size: 1.5rem; }
.product-description-content h3 { font-size: 1.25rem; }
.product-description-content h4 { font-size: 1.125rem; }
.product-description-content h5 { font-size: 1rem; }
.product-description-content h6 { font-size: 0.875rem; color: var(--text-muted); }

.product-description-content ul,
.product-description-content ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.product-description-content ul li {
    list-style-type: disc;
    margin-bottom: 0.25rem;
    line-height: 1.75;
    color: var(--text-muted);
}

.product-description-content ol li {
    list-style-type: decimal;
    margin-bottom: 0.25rem;
    line-height: 1.75;
    color: var(--text-muted);
}

.product-description-content strong {
    font-weight: 600;
    color: var(--text);
}

.product-description-content em {
    font-style: italic;
}

.product-description-content a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.product-description-content a:hover {
    color: var(--accent-dark);
}

.product-description-content blockquote {
    border-left: 4px solid var(--accent);
    padding: 0.75rem 1rem;
    margin: 1rem 0;
    color: var(--text-muted);
    font-style: italic;
    background-color: var(--bg-alt);
    border-radius: 0;
}

.product-description-content code {
    background-color: var(--bg-alt);
    color: var(--accent);
    padding: 0.125rem 0.375rem;
    border-radius: 0;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.875em;
}

.product-description-content pre {
    background-color: var(--text);
    color: var(--surface);
    padding: 1rem;
    border-radius: 0;
    overflow-x: auto;
    margin: 1rem 0;
    font-size: 0.875rem;
}

.product-description-content pre code {
    background-color: transparent;
    color: inherit;
    padding: 0;
}

.product-description-content img {
    max-width: 100%;
    height: auto;
    margin: 1rem 0;
}

.product-description-content hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 1.5rem 0;
}

.product-description-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.875rem;
    border: 2px solid var(--primary);
}

.product-description-content th,
.product-description-content td {
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    text-align: left;
}

.product-description-content th {
    background-color: var(--primary);
    font-weight: 600;
    color: #ffffff;
    font-family: 'Oswald', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.8rem;
}

.product-description-content tr:nth-child(even) {
    background-color: var(--bg-alt);
}

.product-description-content tr:hover {
    background-color: rgba(245, 158, 11, 0.08);
}

.specs-content {
    background-color: var(--bg-alt);
    border-radius: 0;
    padding: 1rem 1.25rem;
    border-left: 4px solid var(--accent);
    position: relative;
}

.specs-content::before {
    content: 'SPECIFICATIONS';
    position: absolute;
    top: -10px;
    left: 16px;
    background: var(--accent);
    color: var(--primary-dark);
    font-size: 10px;
    font-weight: 700;
    padding: 2px 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-family: 'Oswald', sans-serif;
}

.specs-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0 4px;
    font-size: 14px;
    background-color: var(--surface);
    border-radius: 0;
    overflow: hidden;
    border: 2px solid var(--border);
}

.specs-content table td {
    border: 1px solid var(--border);
    padding: 10px 14px;
    text-align: left;
}

.specs-content table td strong {
    color: var(--primary);
    font-weight: 600;
    font-family: 'Oswald', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    font-size: 13px;
}

.specs-content table tr:nth-child(even) td {
    background-color: var(--bg-alt);
}

.specs-content table tr:hover td {
    background-color: rgba(245, 158, 11, 0.06);
}

/* ========================================
   Toast Notification — Industrial Style
   工业风格通知：硬朗边框 + 斜切角
   ======================================== */
.toast-notification {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    animation: slideInRight 0.3s ease-out;
}

.toast-notification > div {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 28px 16px 20px;
    color: #ffffff;
    min-width: 320px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
    border-left: 5px solid var(--accent);
    position: relative;
    clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
    font-weight: 500;
}

.toast-notification .bg-gradient-to-r {
    background: var(--primary);
}

.toast-notification .from-green-500 {
    background: var(--primary);
    border-left-color: #10b981;
}

.toast-notification .from-yellow-500 {
    background: var(--primary);
    border-left-color: var(--accent);
}

.toast-notification .from-red-500 {
    background: var(--primary);
    border-left-color: #ef4444;
}

.toast-notification .from-blue-500 {
    background: var(--primary);
    border-left-color: #3b82f6;
}

.toast-notification .flex-shrink-0 {
    flex-shrink: 0;
}

.toast-notification .w-8 {
    width: 32px;
}

.toast-notification .h-8 {
    height: 32px;
}

.toast-notification .bg-white {
    background: rgba(255, 255, 255, 0.2);
}

.toast-notification .bg-opacity-20 {
    background: rgba(255, 255, 255, 0.2);
}

.toast-notification .rounded-full {
    border-radius: 50%;
}

.toast-notification .flex {
    display: flex;
}

.toast-notification .items-center {
    align-items: center;
}

.toast-notification .justify-center {
    justify-content: center;
}

.toast-notification svg {
    width: 20px;
    height: 20px;
}

.toast-notification .font-medium {
    font-weight: 500;
}

/* ========================================
   Animations
   ======================================== */
@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeOutUp {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-spin {
    animation: spin 1s linear infinite;
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

main {
    animation: fadeIn 0.4s ease-out;
}

/* ========================================
   Contact Cards — Industrial Style
   联系信息卡片：工业硬朗风格
   ======================================== */
.contact-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.contact-card {
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 40px 32px;
    position: relative;
    transition: all 0.3s ease;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: var(--accent);
    transition: height 0.4s ease;
}

.contact-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 12px 40px rgba(30, 58, 95, 0.12);
}

.contact-card:hover::before {
    height: 100%;
}

.cc-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-alt);
    border: 2px solid var(--border);
    font-size: 28px;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}

.contact-card h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--primary);
    position: relative;
    z-index: 1;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
}

.contact-card h3::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent);
}

.contact-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}

.contact-card p:last-child {
    margin-bottom: 0;
}

.contact-card a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
    font-weight: 500;
}

.contact-card a:hover {
    color: var(--accent-dark);
}

.cc-hours {
    font-size: 13px !important;
    color: var(--text-light) !important;
    font-style: italic;
    margin-top: 12px !important;
    padding-top: 12px;
    border-top: 1px dashed var(--border);
}

/* ========================================
   Contact Map & Form Layout — Industrial Style
   联系地图/工厂信息 + 表单布局
   ======================================== */
.contact-section {
    padding-top: 20px;
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 0;
    border: 2px solid var(--border);
}

/* 左侧：工厂信息面板 */
.contact-map-panel {
    background: var(--primary);
    padding: 48px 40px;
    color: #ffffff;
    position: relative;
    overflow: hidden;
    border-right: 4px solid var(--accent);
}

.contact-map-panel::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 36px 36px;
    pointer-events: none;
}

.contact-map-panel::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--accent);
}

.map-placeholder {
    position: relative;
    z-index: 2;
    margin-bottom: 36px;
    padding-bottom: 32px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.15);
}

.map-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid var(--accent);
    font-size: 36px;
    margin-bottom: 20px;
}

.map-placeholder h3 {
    font-size: 24px;
    color: #ffffff;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 12px;
}

.map-placeholder h3::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background: var(--accent);
}

.map-placeholder p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.85);
}

/* 工厂信息列表 */
.factory-info-list {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.fi-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.06);
    border-left: 3px solid var(--accent);
    transition: background 0.25s;
}

.fi-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.fi-label {
    font-family: 'Oswald', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: 0.02em;
    min-width: 80px;
}

.fi-value {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

/* 右侧：表单面板 */
.contact-form-panel {
    background: var(--surface);
    padding: 48px 40px;
    position: relative;
}

.contact-form-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.cf-title {
    font-size: 28px;
    margin-bottom: 12px;
    color: var(--primary);
    position: relative;
    padding-bottom: 16px;
    border-bottom: 3px solid var(--primary);
}

.cf-title::before {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 70px;
    height: 3px;
    background: var(--accent);
    z-index: 1;
}

.cf-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 32px;
    line-height: 1.7;
}

/* 表单行（双列） */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* 验证码行 */
.captcha-row {
    display: flex;
    gap: 12px;
    align-items: stretch;
}

.captcha-row input {
    flex: 1;
}

.captcha-row img {
    height: 48px;
    width: 120px;
    cursor: pointer;
    border: 2px solid var(--border);
    background: var(--bg-alt);
    flex-shrink: 0;
    transition: border-color 0.25s;
}

.captcha-row img:hover {
    border-color: var(--primary);
}

/* ========================================
   Breadcrumb — Industrial Style
   面包屑导航
   ======================================== */
.page-breadcrumb {
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    font-family: 'DM Sans', sans-serif;
    font-size: 13px;
}

.breadcrumb-list a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.25s;
}

.breadcrumb-list a:hover {
    color: var(--accent);
}

.breadcrumb-sep {
    color: var(--text-light);
    font-size: 12px;
}

.breadcrumb-current {
    color: var(--primary);
    font-weight: 500;
}

/* ========================================
   Product Detail Hero — Industrial Style
   产品详情页头部区域
   ======================================== */
.pd-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
    color: #ffffff;
}

.pd-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.pd-hero-inner {
    position: relative;
    z-index: 2;
    max-width: 900px;
}

.pd-model-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-left: 3px solid var(--accent);
    padding: 8px 16px;
    margin-bottom: 24px;
}

.pd-model-label {
    font-family: 'DM Sans', sans-serif;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.7);
}

.pd-model-code {
    font-family: 'Oswald', sans-serif;
    font-size: 15px;
    font-weight: 600;
    color: #ffffff;
}

.pd-title {
    font-size: 52px;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 20px;
    color: #ffffff;
}

.pd-subtitle {
    font-size: 17px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.85);
    max-width: 700px;
    font-family: 'DM Sans', sans-serif;
}

.pd-hero-decor {
    position: absolute;
    right: 0;
    bottom: -2px;
    left: 0;
    height: 60px;
    background: var(--surface);
    clip-path: polygon(0 100%, 100% 100%, 100% 40%, 0 100%);
}

/* ========================================
   Product Detail Layout — Industrial Style
   产品详情主体布局
   ======================================== */
.pd-section {
    padding-top: 0;
    margin-top: -40px;
    position: relative;
    z-index: 3;
}

.pd-layout {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 50px;
    align-items: start;
}

/* 左侧：产品图片区 */
.pd-image-col {
    position: sticky;
    top: 100px;
}

.pd-image-frame {
    position: relative;
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    overflow: hidden;
}

.pd-image-frame::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 0, 0, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
}

.pd-image-corner {
    position: absolute;
    width: 24px;
    height: 24px;
    border-color: var(--accent);
    border-style: solid;
    z-index: 2;
}

.pd-image-corner.tl {
    top: 8px;
    left: 8px;
    border-width: 3px 0 0 3px;
}

.pd-image-corner.tr {
    top: 8px;
    right: 8px;
    border-width: 3px 3px 0 0;
}

.pd-image-corner.bl {
    bottom: 8px;
    left: 8px;
    border-width: 0 0 3px 3px;
}

.pd-image-corner.br {
    bottom: 8px;
    right: 8px;
    border-width: 0 3px 3px 0;
}

.pd-main-image {
    max-width: 100%;
    max-height: 380px;
    object-fit: contain;
    position: relative;
    z-index: 1;
}

.pd-icon-placeholder {
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-alt);
    border: 2px solid var(--border);
    position: relative;
    z-index: 1;
}

.pd-icon-big {
    font-size: 96px;
}

.pd-image-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--accent);
    color: #ffffff;
    font-family: 'Oswald', sans-serif;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    padding: 6px 14px;
    z-index: 3;
    text-transform: uppercase;
}

/* 快速规格 */
.pd-quick-specs {
    margin-top: 24px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-top: 3px solid var(--primary);
    padding: 24px;
}

.pd-quick-specs-title {
    font-family: 'Oswald', sans-serif;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
    position: relative;
}

.pd-quick-specs-title::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent);
    z-index: 1;
}

.pd-quick-specs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.pd-quick-spec-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg-alt);
    border-left: 2px solid var(--accent);
    transition: background 0.25s;
}

.pd-quick-spec-item:hover {
    background: var(--primary-bg);
}

.pqs-icon {
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 1px;
}

.pqs-label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.pqs-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    font-family: 'DM Sans', sans-serif;
    line-height: 1.4;
}

/* 右侧：产品信息区 */
.pd-info-col {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.pd-info-card {
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 40px;
    position: relative;
}

.pd-info-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.pd-info-header {
    margin-bottom: 32px;
}

.pd-info-tag {
    display: inline-block;
    background: var(--primary-bg);
    color: var(--primary);
    font-family: 'Oswald', sans-serif;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 6px 14px;
    margin-bottom: 16px;
    border-left: 3px solid var(--accent);
}

.pd-info-title {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.25;
    color: var(--primary);
    margin-bottom: 12px;
}

.pd-info-model {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'DM Sans', sans-serif;
}

.pim-label {
    font-size: 14px;
    color: var(--text-muted);
}

.pim-code {
    font-family: 'Oswald', sans-serif;
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.02em;
}

/* 产品特点列表 */
.pd-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 32px;
}

.pd-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 14px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    transition: all 0.25s;
}

.pd-feature-item:hover {
    border-color: var(--primary);
    background: var(--primary-bg);
    transform: translateX(2px);
}

.pdf-icon {
    color: var(--accent);
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
    margin-top: 2px;
}

.pdf-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.pdf-text strong {
    font-size: 13px;
    color: var(--text);
    font-weight: 600;
}

.pdf-text span {
    font-size: 12px;
    color: var(--text-muted);
}

/* 操作按钮 */
.pd-actions {
    display: flex;
    gap: 14px;
}

.pd-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 20px;
    font-family: 'Oswald', sans-serif;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.25s;
}

.pd-btn-icon {
    font-size: 16px;
}

.pd-btn-primary {
    background: var(--accent);
    color: #ffffff;
    border-color: var(--accent);
}

.pd-btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(220, 38, 38, 0.3);
}

.pd-btn-secondary {
    background: transparent;
    color: var(--primary);
    border-color: var(--primary);
}

.pd-btn-secondary:hover {
    background: var(--primary);
    color: #ffffff;
    transform: translateY(-2px);
}

/* 规格参数面板 */
.pd-specs-panel {
    background: var(--surface);
    border: 2px solid var(--border);
    border-top: 3px solid var(--accent);
    overflow: hidden;
}

.pd-specs-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 28px;
    background: var(--bg-alt);
    border-bottom: 2px solid var(--border);
}

.pd-specs-icon {
    font-size: 20px;
}

.pd-specs-header h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin: 0;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.03em;
}

.pd-specs-body {
    padding: 8px 0;
}

.pd-spec-row {
    display: flex;
    padding: 14px 28px;
    border-bottom: 1px solid var(--border);
    transition: background 0.25s;
}

.pd-spec-row:last-child {
    border-bottom: none;
}

.pd-spec-row:hover {
    background: var(--primary-bg);
}

.pd-spec-label {
    width: 140px;
    flex-shrink: 0;
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.pd-spec-value {
    flex: 1;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.pd-spec-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-bg);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    font-family: 'DM Sans', sans-serif;
    border-left: 2px solid var(--accent);
}

/* 描述和规格section间距 */
.pd-desc-section {
    padding-top: 40px;
}

.pd-specs-section {
    padding-top: 20px;
}

/* ========================================
   Inquiry Page — Industrial Style
   询价页面
   ======================================== */

/* Inquiry Hero */
.inq-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
    color: #ffffff;
}

.inq-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}

.inq-hero-inner {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.inq-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-left: 3px solid var(--accent);
    padding: 8px 16px;
    margin-bottom: 24px;
    font-family: 'Oswald', sans-serif;
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.inq-hero-icon {
    font-size: 16px;
}

.inq-hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 16px;
    color: #ffffff;
}

.inq-hero-title em {
    font-style: normal;
    color: var(--accent);
}

.inq-hero-subtitle {
    font-size: 17px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.85);
    max-width: 650px;
    font-family: 'DM Sans', sans-serif;
}

.inq-hero-decor {
    position: absolute;
    right: 0;
    bottom: -2px;
    left: 0;
    height: 60px;
    background: var(--surface);
    clip-path: polygon(0 100%, 100% 100%, 100% 40%, 0 100%);
}

/* Why Choose Us — Full Width */
.inq-why-us {
    margin-bottom: 50px;
}

.inq-section-header {
    text-align: center;
    margin-bottom: 40px;
}

.inq-section-tag {
    display: inline-block;
    background: var(--primary-bg);
    color: var(--primary);
    font-family: 'Oswald', sans-serif;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    padding: 6px 18px;
    margin-bottom: 16px;
    border-left: 3px solid var(--accent);
    border-right: 3px solid var(--accent);
}

.inq-section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
}

.inq-why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.inq-why-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-top: 3px solid var(--accent);
    padding: 32px 24px;
    text-align: center;
    position: relative;
    transition: all 0.3s;
}

.inq-why-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--accent);
    z-index: 1;
}

.inq-why-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.iwc-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
}

.inq-why-card h4 {
    font-size: 17px;
    font-weight: 600;
    color: var(--primary);
    margin: 0 0 10px 0;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.02em;
}

.inq-why-card p {
    font-size: 13px;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.6;
}

/* Inquiry Layout */
.inq-section {
    padding-top: 0;
    margin-top: -40px;
    position: relative;
    z-index: 3;
}

.inq-layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    align-items: start;
}

.inq-form-col,
.inq-contact-col {
    min-width: 0;
}

/* Right Column: Contact */
.inq-contact-col {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.inq-contact-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-top: 3px solid var(--primary);
    padding: 32px;
    position: relative;
}

.inq-contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--accent);
    z-index: 1;
}

.inq-contact-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
}

.inq-contact-icon {
    font-size: 28px;
}

.inq-contact-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary);
    margin: 0;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.03em;
}

/* Contact Card */
.inq-contact-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.inq-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.inq-contact-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.ic-icon {
    font-size: 18px;
    flex-shrink: 0;
    margin-top: 2px;
}

.ic-text {
    flex: 1;
}

.ic-label {
    font-size: 12px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.ic-text a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.25s;
}

.ic-text a:hover {
    color: var(--accent);
}

.ic-text span {
    font-size: 14px;
    color: var(--text);
    line-height: 1.6;
}

/* Right Column */
.inq-form-col {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

/* Guarantee Card */
.inq-guarantee-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #ffffff;
    border: 2px solid var(--primary);
    padding: 28px;
    position: relative;
    overflow: hidden;
}

.inq-guarantee-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 24px 24px;
    pointer-events: none;
}

.inq-guarantee-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
    position: relative;
    z-index: 1;
}

.inq-guarantee-icon {
    font-size: 24px;
}

.inq-guarantee-header h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.03em;
}

.inq-guarantee-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    z-index: 1;
}

.inq-guarantee-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    line-height: 1.5;
}

.ig-icon {
    width: 20px;
    height: 20px;
    background: var(--accent);
    color: var(--primary-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

/* Cart Panel */
.inq-cart-panel {
    background: var(--surface);
    border: 2px solid var(--border);
    border-top: 3px solid var(--accent);
    overflow: hidden;
}

.inq-cart-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 28px;
    background: var(--bg-alt);
    border-bottom: 2px solid var(--border);
}

.inq-cart-icon {
    font-size: 22px;
}

.inq-cart-header h3 {
    flex: 1;
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin: 0;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.03em;
    display: flex;
    align-items: center;
    gap: 10px;
}

.inq-cart-count {
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    background: var(--primary-bg);
    padding: 2px 10px;
    font-family: 'DM Sans', sans-serif;
}

.inq-cart-clear {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 6px 14px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.25s;
    font-family: 'DM Sans', sans-serif;
}

.inq-cart-clear:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--primary-bg);
}

.inq-cart-body {
    max-height: 200px;
    overflow-y: auto;
    padding: 8px 0;
}

/* Cart Item */
.cart-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 28px;
    border-bottom: 1px solid var(--border);
    transition: background 0.25s;
}

.cart-item:hover {
    background: var(--primary-bg);
}

.cart-item-img {
    width: 48px;
    height: 48px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.cart-item-info {
    flex: 1;
    min-width: 0;
}

.cart-item-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cart-item-model {
    font-size: 12px;
    color: var(--text-muted);
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.02em;
}

.cart-item-remove {
    width: 28px;
    height: 28px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all 0.25s;
    flex-shrink: 0;
}

.cart-item-remove:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
}

/* Cart Empty */
.inq-cart-empty {
    padding: 40px 28px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.ice-icon {
    font-size: 48px;
    opacity: 0.5;
}

.inq-cart-empty p {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.6;
}

.inq-cart-empty .btn {
    padding: 10px 24px;
    font-size: 13px;
}

/* Form Panel */
.inq-form-panel {
    background: var(--surface);
    border: 2px solid var(--border);
    padding: 36px;
    position: relative;
}

.inq-form-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.inq-form-header {
    margin-bottom: 28px;
}

.inq-form-tag {
    display: inline-block;
    background: var(--primary-bg);
    color: var(--primary);
    font-family: 'Oswald', sans-serif;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 6px 14px;
    margin-bottom: 14px;
    border-left: 3px solid var(--accent);
}

.inq-form-header h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    margin: 0 0 8px 0;
}

.inq-form-header p {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
}

/* Submit Button */
.inq-submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    font-family: 'Oswald', sans-serif;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.inq-btn-icon {
    font-size: 18px;
}

/* ========================================
   Responsive — Industrial Style
   ======================================== */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .hero-visual {
        height: 400px;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-story {
        grid-template-columns: 1fr;
    }

    .contact-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-layout {
        grid-template-columns: 1fr;
    }

    .contact-map-panel {
        border-right: none;
        border-bottom: 4px solid var(--accent);
    }

    .pd-title {
        font-size: 40px;
    }

    .pd-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .pd-image-col {
        position: static;
    }

    .pd-features {
        grid-template-columns: 1fr 1fr;
    }

    .inq-hero-title {
        font-size: 40px;
    }

    .inq-section-title {
        font-size: 28px;
    }

    .inq-why-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .inq-layout {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .inq-contact-col {
        position: static;
    }

    .scope-grid {
        grid-template-columns: 1fr;
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }

}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu {
        display: block;
    }

    .mobile-nav.active {
        display: block;
    }

    .hero {
        padding: 80px 24px 120px;
    }

    .hero h1 {
        font-size: 42px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .products-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 70px 0;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
        gap: 32px;
    }

    .footer-copy {
        padding-left: 0;
        border-left: none;
        border-top: 2px solid var(--accent);
        padding-top: 20px;
        order: 2;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        order: 1;
    }

    .adv-item {
        grid-template-columns: 80px 1fr;
        gap: 20px;
        padding: 32px 0;
    }

    .adv-num {
        font-size: 48px;
        padding-left: 16px;
    }

    .container {
        padding: 0 24px;
    }

    .nav-container {
        padding: 16px 24px;
    }

    .page-hero {
        padding: 100px 24px 70px;
    }

    /* 工厂风格产品列表响应式 */
    .product-filter-bar {
        padding: 16px 20px;
    }

    .pfb-title {
        font-size: 16px;
        margin-bottom: 12px;
    }

    .pfb-selects {
        gap: 12px;
    }

    .pfb-select-item {
        min-width: 100%;
        max-width: 100%;
    }

    .pfb-select-item.pfb-action {
        width: 100%;
        flex-direction: row;
    }

    .pfb-submit-btn,
    .pfb-reset-btn {
        flex: 1;
        padding: 12px 16px;
        font-size: 11px;
    }

    .products-by-category {
        gap: 30px;
    }

    .category-block-header {
        padding: 16px 20px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .category-block-title {
        font-size: 18px;
    }

    /* 移动端表格布局：变为卡片式 */
    .product-table-head {
        display: none;
    }

    .product-row {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 16px 20px;
    }

    .product-row::before {
        width: 4px;
    }

    .pr-col {
        width: 100%;
    }

    .pr-model {
        justify-content: flex-start;
    }

    .pr-name-text {
        font-size: 13px;
    }

    .pr-action {
        justify-content: flex-start;
    }

    .pr-detail-btn,
    .pr-inquiry-btn {
        padding: 6px 12px;
        font-size: 11px;
    }

    /* 分页移动端 */
    .pagination {
        gap: 12px;
        margin-top: 40px;
        padding-top: 30px;
    }

    .page-btn {
        padding: 10px 18px;
        font-size: 11px;
    }

    .page-info {
        font-size: 16px;
        gap: 6px;
    }

    .page-current {
        font-size: 22px;
    }

    .category-more-link-wrap {
        padding: 14px 20px;
        text-align: center;
    }

    .category-more-link {
        font-size: 12px;
    }

    .page-hero h1 {
        font-size: 48px;
    }

    .filter-header {
        padding: 20px 24px;
    }

    .filter-groups {
        padding: 24px;
    }

    .cta-section {
        padding: 100px 0;
    }

    .toast-notification {
        left: 16px;
        right: 16px;
        bottom: 16px;
    }

    .toast-notification > div {
        min-width: auto;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .cat-card {
        padding: 36px 28px;
    }

    .cat-num {
        font-size: 48px;
    }

    .contact-cards-grid {
        grid-template-columns: 1fr;
    }

    .contact-map-panel,
    .contact-form-panel {
        padding: 32px 24px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .captcha-row {
        flex-direction: column;
    }

    .captcha-row img {
        width: 100%;
        height: 48px;
    }

    .pd-title {
        font-size: 32px;
    }

    .pd-subtitle {
        font-size: 15px;
    }

    .pd-info-card {
        padding: 28px 24px;
    }

    .pd-info-title {
        font-size: 26px;
    }

    .pd-features {
        grid-template-columns: 1fr;
    }

    .pd-actions {
        flex-direction: column;
    }

    .pd-quick-specs-grid {
        grid-template-columns: 1fr;
    }

    .pd-spec-row {
        flex-direction: column;
        gap: 8px;
        padding: 12px 20px;
    }

    .pd-spec-label {
        width: auto;
    }

    .inq-hero-title {
        font-size: 32px;
    }

    .inq-hero-subtitle {
        font-size: 15px;
    }

    .inq-section-title {
        font-size: 24px;
    }

    .inq-why-grid {
        grid-template-columns: 1fr;
    }

    .inq-why-card {
        padding: 24px 20px;
    }

    .iwc-icon {
        font-size: 32px;
    }

    .inq-contact-card {
        padding: 24px 20px;
    }

    .inq-form-panel {
        padding: 28px 20px;
    }

    .inq-form-header h3 {
        font-size: 22px;
    }

    .inq-cart-header {
        padding: 16px 20px;
    }

    .cart-item {
        padding: 12px 20px;
    }

    .inq-cart-empty {
        padding: 32px 20px;
    }

    .faq-item {
        padding: 28px 24px;
    }



    .prod-section-title {
        font-size: 28px;
    }

    .filter-header select,
    .filter-header input {
        min-width: 100%;
        width: 100%;
    }

    .filter-search {
        min-width: 100%;
    }

    .filter-clear-btn {
        width: 100%;
        justify-content: center;
    }
}

/* ========================================
   404 Error Page — Industrial Style
   404错误页工业风格
   ======================================== */
.error-page {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 80px 0;
    background: var(--bg);
    position: relative;
    overflow: hidden;
}

.error-page::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(30, 58, 95, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(30, 58, 95, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.error-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.error-code {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.error-num {
    font-family: 'Oswald', sans-serif;
    font-size: 120px;
    font-weight: 700;
    line-height: 1;
    color: var(--primary);
    text-shadow: 4px 4px 0 var(--accent);
}

.error-icon {
    font-size: 80px;
    animation: spinGear 4s linear infinite;
}

@keyframes spinGear {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.error-title {
    font-size: 42px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 20px;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.03em;
}

.error-desc {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 40px;
    font-family: 'Inter', sans-serif;
}

.error-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.error-links {
    padding-top: 40px;
    border-top: 2px solid var(--border);
}

.error-links h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 20px;
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.error-links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.error-links-grid a {
    padding: 12px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    transition: all 0.25s;
    display: block;
}

.error-links-grid a:hover {
    border-color: var(--accent);
    color: var(--primary);
    background: var(--primary-bg);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .error-num {
        font-size: 80px;
    }

    .error-icon {
        font-size: 56px;
    }

    .error-title {
        font-size: 28px;
    }

    .error-links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========================================
   Related Products — Industrial Style
   相关产品推荐工业风格
   ======================================== */
.pd-related-section {
    background: var(--bg-alt);
}

.related-products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.rp-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-top: 3px solid var(--accent);
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.rp-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
    border-color: var(--accent);
}

.rp-image-link {
    display: block;
    aspect-ratio: 4 / 3;
    background: var(--bg-alt);
    overflow: hidden;
    position: relative;
}

.rp-image-link img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 16px;
    transition: transform 0.3s ease;
}

.rp-card:hover .rp-image-link img {
    transform: scale(1.05);
}

.rp-icon-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    opacity: 0.5;
}

.rp-content {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.rp-model {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    font-family: 'Oswald', sans-serif;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.rp-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
    line-height: 1.4;
    flex: 1;
    font-family: 'Oswald', sans-serif;
}

.rp-name a {
    color: inherit;
    text-decoration: none;
    transition: color 0.25s;
}

.rp-name a:hover {
    color: var(--accent);
}

.rp-actions {
    display: flex;
    gap: 8px;
}

.rp-add-btn {
    flex: 1;
    padding: 8px 12px;
    background: var(--primary-bg);
    border: 1px solid var(--border);
    color: var(--primary);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s;
    font-family: 'Inter', sans-serif;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.rp-add-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

.rp-view-btn {
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.25s;
    font-family: 'Inter', sans-serif;
    white-space: nowrap;
}

.rp-view-btn:hover {
    background: var(--accent);
    color: var(--primary-dark);
}

@media (max-width: 1024px) {
    .related-products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .related-products-grid {
        grid-template-columns: 1fr;
    }
}