/* ============================================
   CNAutoRU.com — 中国对俄二手车出口询盘站
   专业级样式表 — 支持俄/英/中三语
   ============================================ */

/* === CSS 变量 === */
:root {
    --bg: #f8f9fb;
    --bg2: #ffffff;
    --ink: #1a2332;
    --muted: #6b7785;
    --rule: #e2e8f0;
    --accent: #0a2342;          /* 深蓝 — 专业/中国/信任 */
    --accent2: #c8102e;         /* 红色 — 能量/中国元素 */
    --accent3: #f5a623;         /* 金色 — 高端/价值 */
    --accent-light: #1a4b8c;
    --success: #16a34a;
    --warning: #ea580c;
    --shadow-sm: 0 1px 3px rgba(10,35,66,0.08);
    --shadow-md: 0 4px 12px rgba(10,35,66,0.10);
    --shadow-lg: 0 12px 32px rgba(10,35,66,0.15);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --max-width: 1280px;
    --font: 'Inter', 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
    --font-heading: 'Inter', 'Segoe UI', 'Roboto', sans-serif;
}

/* === 基础重置 === */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: var(--font);
    color: var(--ink);
    background: var(--bg);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-light); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent2); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul, ol { list-style: none; }

/* === 容器 === */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 800px; margin: 0 auto; padding: 0 24px; }

/* === 排版 === */
h1, h2, h3, h4 { font-family: var(--font-heading); font-weight: 700; line-height: 1.25; color: var(--accent); }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }
.section-title { text-align: center; margin-bottom: 0.5rem; }
.section-subtitle { text-align: center; color: var(--muted); font-size: 1.05rem; margin-bottom: 3rem; max-width: 700px; margin-left: auto; margin-right: auto; }
.text-accent { color: var(--accent2); }
.text-gold { color: var(--accent3); }

/* === 按钮 === */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600;
    font-size: 0.95rem; transition: all 0.25s; cursor: pointer; border: 2px solid transparent;
    text-align: center;
}
.btn-primary { background: var(--accent2); color: #fff; }
.btn-primary:hover { background: #a00d24; color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--accent); color: #fff; }
.btn-secondary:hover { background: #061629; color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; border-color: var(--accent); color: var(--accent); }
.btn-outline:hover { background: var(--accent); color: #fff; }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* === 头部导航 === */
.header {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--rule);
    box-shadow: var(--shadow-sm);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 70px;
}
.logo {
    display: flex; align-items: center; gap: 10px;
    font-weight: 800; font-size: 1.3rem; color: var(--accent);
    text-decoration: none;
}
.logo:hover { color: var(--accent); }
.logo-icon {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, var(--accent2), var(--accent3));
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 800; font-size: 1.1rem;
}
.nav {
    display: flex; align-items: center; gap: 4px;
}
.nav a {
    padding: 8px 16px; border-radius: var(--radius-sm);
    color: var(--ink); font-weight: 500; font-size: 0.95rem;
    transition: all 0.2s;
}
.nav a:hover, .nav a.active {
    background: var(--bg); color: var(--accent2);
}
.nav-cta {
    background: var(--accent2); color: #fff !important;
    padding: 10px 20px !important; margin-left: 8px;
}
.nav-cta:hover { background: #a00d24; color: #fff !important; }

/* 语言切换器 */
.lang-switcher {
    display: flex; align-items: center; gap: 2px;
    margin-left: 16px; padding-left: 16px;
    border-left: 1px solid var(--rule);
}
.lang-switcher a {
    padding: 6px 10px; font-size: 0.8rem; font-weight: 600;
    color: var(--muted); border-radius: 4px;
    text-transform: uppercase; letter-spacing: 0.05em;
}
.lang-switcher a.active { background: var(--accent); color: #fff; }
.lang-switcher a:hover:not(.active) { background: var(--bg); color: var(--accent); }

/* 移动端菜单按钮 */
.menu-toggle { display: none; font-size: 1.5rem; color: var(--accent); }

/* === Hero 区域 === */
.hero {
    background: linear-gradient(135deg, var(--accent) 0%, #061629 100%);
    color: #fff; padding: 80px 0 100px; position: relative; overflow: hidden;
}
.hero::before {
    content: ''; position: absolute; top: -50%; right: -10%;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(200,16,46,0.15) 0%, transparent 70%);
    border-radius: 50%;
}
.hero::after {
    content: ''; position: absolute; bottom: -30%; left: -10%;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(245,166,35,0.1) 0%, transparent 70%);
    border-radius: 50%;
}
.hero-content { position: relative; z-index: 2; max-width: 720px; }
.hero h1 { color: #fff; font-size: 3rem; line-height: 1.2; margin-bottom: 1.2rem; }
.hero h1 span { color: var(--accent3); }
.hero-subtitle { font-size: 1.2rem; color: rgba(255,255,255,0.85); margin-bottom: 2rem; line-height: 1.6; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
    margin-top: 4rem; position: relative; z-index: 2;
}
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 2.5rem; font-weight: 800; color: var(--accent3); line-height: 1; }
.hero-stat-label { font-size: 0.9rem; color: rgba(255,255,255,0.7); margin-top: 6px; }

/* === 通用区块 === */
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.bg-white { background: var(--bg2); }
.bg-light { background: var(--bg); }

/* === 特性卡片 === */
.features-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.feature-card {
    background: var(--bg2); border-radius: var(--radius-md); padding: 32px;
    box-shadow: var(--shadow-sm); transition: all 0.3s;
    border: 1px solid var(--rule);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--accent2); }
.feature-icon {
    width: 56px; height: 56px; border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    display: flex; align-items: center; justify-content: center;
    font-size: 1.6rem; margin-bottom: 18px;
}
.feature-icon.red { background: linear-gradient(135deg, var(--accent2), #e63950); }
.feature-icon.gold { background: linear-gradient(135deg, var(--accent3), #ffc658); }
.feature-card h3 { margin-bottom: 10px; font-size: 1.2rem; }
.feature-card p { color: var(--muted); font-size: 0.95rem; line-height: 1.6; }

/* === 流程步骤 === */
.process-steps {
    display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px;
    counter-reset: step;
}
.process-step {
    text-align: center; position: relative; counter-increment: step;
}
.process-step-num {
    width: 64px; height: 64px; margin: 0 auto 18px;
    background: var(--bg2); border: 3px solid var(--accent2);
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; font-weight: 800; color: var(--accent2);
    position: relative; z-index: 2;
}
.process-step::before {
    content: ''; position: absolute; top: 32px; left: 50%; width: 100%;
    border-top: 2px dashed var(--rule); z-index: 1;
}
.process-step:last-child::before { display: none; }
.process-step h4 { margin-bottom: 8px; font-size: 1.05rem; }
.process-step p { color: var(--muted); font-size: 0.88rem; }

/* === 车辆卡片 === */
.cars-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.cars-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }
.car-card {
    background: var(--bg2); border-radius: var(--radius-md); overflow: hidden;
    box-shadow: var(--shadow-sm); transition: all 0.3s;
    border: 1px solid var(--rule); display: flex; flex-direction: column;
}
.car-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.car-card-img {
    position: relative; aspect-ratio: 4/3; overflow: hidden; background: var(--bg);
}
.car-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.car-card:hover .car-card-img img { transform: scale(1.05); }
.car-card-badge {
    position: absolute; top: 12px; left: 12px;
    padding: 4px 12px; border-radius: 20px;
    font-size: 0.75rem; font-weight: 700; color: #fff;
    background: var(--accent2);
}
.car-card-badge.onsale { background: var(--success); }
.car-card-badge.presale { background: var(--warning); }
.car-card-body { padding: 18px; flex: 1; display: flex; flex-direction: column; }
.car-card-title { font-weight: 700; font-size: 1.05rem; color: var(--ink); margin-bottom: 8px; line-height: 1.35; }
.car-card-title a { color: inherit; }
.car-card-title a:hover { color: var(--accent2); }
.car-card-meta {
    display: flex; gap: 16px; margin-bottom: 12px; font-size: 0.85rem; color: var(--muted);
}
.car-card-meta span { display: flex; align-items: center; gap: 4px; }
.car-card-footer {
    margin-top: auto; display: flex; align-items: center; justify-content: space-between;
    padding-top: 12px; border-top: 1px solid var(--rule);
}
.car-card-price { font-size: 1.3rem; font-weight: 800; color: var(--accent2); }
.car-card-price-poa { font-size: 0.9rem; color: var(--muted); font-weight: 600; }

/* === 筛选侧栏 === */
.inventory-layout { display: grid; grid-template-columns: 280px 1fr; gap: 32px; align-items: start; }
.filters {
    background: var(--bg2); border-radius: var(--radius-md); padding: 24px;
    box-shadow: var(--shadow-sm); position: sticky; top: 90px;
}
.filters h3 { font-size: 1.1rem; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--rule); }
.filter-group { margin-bottom: 20px; }
.filter-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.03em; }
.filter-group select, .filter-group input {
    width: 100%; padding: 10px 12px; border: 1px solid var(--rule);
    border-radius: var(--radius-sm); font-family: inherit; font-size: 0.9rem;
    color: var(--ink); background: var(--bg);
}
.filter-group select:focus, .filter-group input:focus { outline: none; border-color: var(--accent2); }
.filter-checkbox { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; cursor: pointer; font-size: 0.9rem; }
.filter-checkbox input { width: auto; }
.inventory-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 24px; padding: 16px 20px; background: var(--bg2);
    border-radius: var(--radius-md); box-shadow: var(--shadow-sm);
}
.inventory-count { font-size: 0.95rem; color: var(--muted); }
.inventory-count strong { color: var(--accent2); font-size: 1.1rem; }
.sort-select {
    padding: 8px 14px; border: 1px solid var(--rule); border-radius: var(--radius-sm);
    font-family: inherit; font-size: 0.9rem; background: var(--bg);
}

/* === CTA 区域 === */
.cta-section {
    background: linear-gradient(135deg, var(--accent) 0%, #061629 100%);
    color: #fff; padding: 60px 0; text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
    content: ''; position: absolute; top: 0; right: 0; bottom: 0; left: 0;
    background: radial-gradient(circle at 30% 50%, rgba(200,16,46,0.15), transparent 60%);
}
.cta-section h2 { color: #fff; position: relative; z-index: 2; }
.cta-section p { color: rgba(255,255,255,0.85); position: relative; z-index: 2; margin-bottom: 2rem; font-size: 1.1rem; }
.cta-section .btn { position: relative; z-index: 2; }

/* === 车辆详情页 === */
.detail-breadcrumb {
    padding: 16px 0; font-size: 0.85rem; color: var(--muted);
}
.detail-breadcrumb a { color: var(--muted); }
.detail-breadcrumb a:hover { color: var(--accent2); }
.detail-breadcrumb span { margin: 0 8px; }

.detail-layout { display: grid; grid-template-columns: 1fr 380px; gap: 32px; align-items: start; }
.detail-main { }
.detail-gallery { margin-bottom: 32px; }
.detail-gallery-main {
    aspect-ratio: 4/3; border-radius: var(--radius-md); overflow: hidden;
    box-shadow: var(--shadow-md); background: var(--bg); margin-bottom: 12px;
}
.detail-gallery-main img { width: 100%; height: 100%; object-fit: cover; }
.detail-gallery-thumbs {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px;
}
.detail-gallery-thumb {
    aspect-ratio: 1; border-radius: var(--radius-sm); overflow: hidden;
    cursor: pointer; border: 2px solid transparent; transition: border 0.2s;
}
.detail-gallery-thumb.active, .detail-gallery-thumb:hover { border-color: var(--accent2); }
.detail-gallery-thumb img { width: 100%; height: 100%; object-fit: cover; }

.detail-title { font-size: 1.8rem; margin-bottom: 8px; }
.detail-price-row { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; }
.detail-price { font-size: 2rem; font-weight: 800; color: var(--accent2); }
.detail-price-poa { font-size: 1.3rem; color: var(--muted); font-weight: 600; }

.specs-table {
    width: 100%; background: var(--bg2); border-radius: var(--radius-md);
    overflow: hidden; box-shadow: var(--shadow-sm); margin-bottom: 32px;
}
.specs-table tr { border-bottom: 1px solid var(--rule); }
.specs-table tr:last-child { border-bottom: none; }
.specs-table td { padding: 14px 20px; font-size: 0.95rem; }
.specs-table td:first-child { color: var(--muted); width: 45%; font-weight: 500; }
.specs-table td:last-child { font-weight: 600; color: var(--ink); }

.features-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 24px; }
.features-list li {
    padding: 10px 0 10px 28px; position: relative; font-size: 0.95rem;
    border-bottom: 1px solid var(--rule);
}
.features-list li::before {
    content: '✓'; position: absolute; left: 0; top: 10px;
    color: var(--success); font-weight: 800;
}

.detail-sidebar {
    position: sticky; top: 90px;
}
.inquiry-form-card {
    background: var(--bg2); border-radius: var(--radius-md); padding: 28px;
    box-shadow: var(--shadow-md); border-top: 4px solid var(--accent2);
}
.inquiry-form-card h3 { margin-bottom: 8px; }
.inquiry-form-card p { color: var(--muted); font-size: 0.9rem; margin-bottom: 20px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: var(--muted); }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 12px 14px; border: 1px solid var(--rule);
    border-radius: var(--radius-sm); font-family: inherit; font-size: 0.95rem;
    color: var(--ink); background: var(--bg); transition: border 0.2s;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none; border-color: var(--accent2); box-shadow: 0 0 0 3px rgba(200,16,46,0.1);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-consent { display: flex; align-items: flex-start; gap: 8px; font-size: 0.82rem; color: var(--muted); margin-bottom: 16px; }
.form-consent input { width: auto; margin-top: 3px; }
.form-success {
    display: none; padding: 16px; background: #dcfce7; color: #166534;
    border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 0.9rem;
}
.form-success.show { display: block; }

/* === 关于我们 === */
.about-hero { background: linear-gradient(135deg, var(--accent) 0%, #061629 100%); color: #fff; padding: 80px 0; text-align: center; }
.about-hero h1 { color: #fff; margin-bottom: 1rem; }
.about-hero p { color: rgba(255,255,255,0.85); font-size: 1.2rem; max-width: 700px; margin: 0 auto; }
.about-content { max-width: 800px; margin: 0 auto; }
.about-content h2 { margin-bottom: 1rem; }
.about-content p { font-size: 1.05rem; color: var(--muted); margin-bottom: 1.5rem; line-height: 1.8; }
.about-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin: 40px 0; }
.about-stat { text-align: center; padding: 24px; background: var(--bg2); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); }
.about-stat-num { font-size: 2.5rem; font-weight: 800; color: var(--accent2); }
.about-stat-label { color: var(--muted); font-size: 0.9rem; margin-top: 4px; }

/* === 流程页 === */
.process-detail { max-width: 900px; margin: 0 auto; }
.process-detail-step {
    display: grid; grid-template-columns: 80px 1fr; gap: 24px; margin-bottom: 40px;
    padding-bottom: 40px; border-bottom: 1px solid var(--rule);
}
.process-detail-step:last-child { border-bottom: none; }
.process-detail-num {
    width: 64px; height: 64px; background: var(--accent2); color: #fff;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; font-weight: 800;
}
.process-detail-step h3 { margin-bottom: 10px; }
.process-detail-step p { color: var(--muted); line-height: 1.8; }
.docs-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 16px; }
.docs-list li { padding: 14px 18px; background: var(--bg2); border-radius: var(--radius-sm); border-left: 3px solid var(--accent2); font-size: 0.95rem; }

/* === 联系页 === */
.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info-card {
    background: var(--bg2); border-radius: var(--radius-md); padding: 28px;
    box-shadow: var(--shadow-sm); margin-bottom: 20px;
}
.contact-info-card h3 { margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.contact-info-card p { margin-bottom: 10px; color: var(--muted); }
.contact-info-card a { font-weight: 600; }
.contact-method { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.contact-method:last-child { border-bottom: none; }
.contact-method-icon { width: 40px; height: 40px; border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; color: #fff; }
.contact-method-icon.phone { background: var(--accent2); }
.contact-method-icon.email { background: var(--accent); }
.contact-method-icon.whatsapp { background: #25D366; }
.contact-method-icon.telegram { background: #0088cc; }
.contact-method-info strong { display: block; font-size: 0.95rem; }
.contact-method-info span { font-size: 0.85rem; color: var(--muted); }

/* === FAQ === */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--bg2); border-radius: var(--radius-md); margin-bottom: 16px;
    box-shadow: var(--shadow-sm); overflow: hidden;
}
.faq-item summary {
    padding: 20px 24px; font-weight: 600; font-size: 1.05rem; cursor: pointer;
    display: flex; align-items: center; justify-content: space-between;
    list-style: none; color: var(--accent);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.5rem; color: var(--accent2); transition: transform 0.2s; }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-answer { padding: 0 24px 20px; color: var(--muted); line-height: 1.7; }

/* === 页脚 === */
.footer {
    background: var(--accent); color: rgba(255,255,255,0.7); padding: 60px 0 24px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; margin-bottom: 40px; }
.footer-brand h3 { color: #fff; margin-bottom: 12px; font-size: 1.3rem; }
.footer-brand p { font-size: 0.9rem; line-height: 1.6; }
.footer-col h4 { color: #fff; margin-bottom: 16px; font-size: 1rem; }
.footer-col a { color: rgba(255,255,255,0.7); font-size: 0.9rem; display: block; padding: 4px 0; }
.footer-col a:hover { color: var(--accent3); }
.footer-contact-item { font-size: 0.9rem; margin-bottom: 8px; display: flex; align-items: flex-start; gap: 8px; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15); padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem;
    flex-wrap: wrap; gap: 12px;
}
.footer-disclaimer { font-size: 0.8rem; opacity: 0.6; }

/* === 响应式 === */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .cars-grid, .cars-grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .process-step::before { display: none; }
    .detail-layout { grid-template-columns: 1fr; }
    .detail-sidebar { position: static; }
    .inventory-layout { grid-template-columns: 1fr; }
    .filters { position: static; }
    .contact-layout { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .about-stats { grid-template-columns: repeat(2, 1fr); }
    .hero h1 { font-size: 2.2rem; }
}

@media (max-width: 768px) {
    .container, .container-sm { padding: 0 16px; }
    .nav, .lang-switcher { display: none; }
    .menu-toggle { display: block; }
    .nav.open {
        display: flex; flex-direction: column; position: absolute; top: 70px; left: 0; right: 0;
        background: #fff; padding: 16px; box-shadow: var(--shadow-md); gap: 0;
    }
    .nav.open a { width: 100%; padding: 12px 16px; }
    .features-grid { grid-template-columns: 1fr; }
    .cars-grid, .cars-grid.cols-4 { grid-template-columns: 1fr; }
    .process-steps { grid-template-columns: 1fr 1fr; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .hero { padding: 50px 0 60px; }
    .hero h1 { font-size: 1.8rem; }
    .hero-subtitle { font-size: 1rem; }
    .section { padding: 50px 0; }
    .detail-gallery-thumbs { grid-template-columns: repeat(4, 1fr); }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .about-stats { grid-template-columns: 1fr 1fr; }
    .process-detail-step { grid-template-columns: 1fr; }
    .docs-list { grid-template-columns: 1fr; }
    .inventory-header { flex-direction: column; gap: 12px; align-items: stretch; }
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.5rem; }
}

/* === 工具类 === */
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }
.mb-2 { margin-bottom: 2rem; }
.hidden { display: none !important; }
.fade-in { animation: fadeIn 0.6s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }