/* ============================
   湖南中溯检测研究院 - 主样式表
   ============================ */

/* ---- CSS 变量 ---- */
:root {
    --primary: #1565C0;
    --primary-dark: #0D47A1;
    --primary-light: #42A5F5;
    --accent: #00B0F0;
    --accent-soft: #E3F2FD;
    --dark: #1a2332;
    --gray: #64748b;
    --gray-light: #94a3b8;
    --light: #f1f5f9;
    --lighter: #f8fafc;
    --white: #ffffff;
    --success: #16a34a;
    --shadow: 0 2px 12px rgba(0,0,0,.08);
    --shadow-lg: 0 8px 30px rgba(0,0,0,.12);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 20px;
    --transition: .3s cubic-bezier(.4,0,.2,1);
    --max-width: 1200px;
    --header-h: 64px;
}

/* ---- Reset ---- */
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; font-size:16px; }
body {
    font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color:var(--dark);
    line-height:1.7;
    background:var(--white);
    overflow-x:hidden;
    -webkit-font-smoothing:antialiased;
}
a { color:inherit; text-decoration:none; transition:color var(--transition); }
a:hover { color:var(--primary); }
img { max-width:100%; display:block; }
ul,ol { list-style:none; }
button { font-family:inherit; cursor:pointer; border:none; background:none; }

/* ---- 通用容器 ---- */
.container {
    max-width:var(--max-width);
    margin:0 auto;
    padding:0 20px;
}

/* ---- 区段 ---- */
.section { padding:80px 0; }
.section-tight { padding:60px 0; }
.bg-light { background:var(--lighter); }
.bg-primary { background:linear-gradient(135deg,var(--primary-dark),var(--primary)); color:#fff; }
.bg-accent-soft { background:var(--accent-soft); }

/* ---- 标题 ---- */
.section-title {
    text-align:center;
    margin-bottom:12px;
    font-size:2rem;
    font-weight:700;
    color:var(--dark);
}
.section-title.light { color:#fff; }
.section-subtitle {
    text-align:center;
    margin-bottom:48px;
    font-size:1rem;
    color:var(--gray);
    letter-spacing:1px;
}
.section-subtitle.light { color:rgba(255,255,255,.8); }
.section-subtitle::before,
.section-subtitle::after {
    content:'';
    display:inline-block;
    width:30px;
    height:2px;
    background:var(--accent);
    vertical-align:middle;
    margin:0 10px;
    border-radius:2px;
}
.section-subtitle.light::before,
.section-subtitle.light::after { background:rgba(255,255,255,.5); }

/* ============================
   头部导航
   ============================ */
.header {
    position:fixed;
    top:0; left:0; right:0;
    height:var(--header-h);
    background:rgba(255,255,255,.95);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    z-index:1000;
    transition:box-shadow var(--transition), background var(--transition);
    border-bottom:1px solid rgba(0,0,0,.05);
}
.header.scrolled { box-shadow:0 2px 20px rgba(0,0,0,.08); }
.header-inner {
    max-width:var(--max-width);
    margin:0 auto;
    height:100%;
    padding:0 20px;
    display:flex;
    align-items:center;
    justify-content:space-between;
}

/* Logo */
.logo {
    display:flex;
    align-items:center;
    gap:10px;
    font-weight:700;
    font-size:1.1rem;
    color:var(--primary-dark);
    flex-shrink:0;
}
.logo svg { width:36px; height:36px; flex-shrink:0; }
.logo-text { white-space:nowrap; }
.logo-text small { display:block; font-size:.7rem; font-weight:400; color:var(--gray); }

/* 导航 */
.nav { display:flex; align-items:center; gap:4px; }
.nav a {
    padding:8px 16px;
    border-radius:var(--radius-sm);
    font-size:.95rem;
    color:var(--dark);
    font-weight:500;
    transition:all var(--transition);
    position:relative;
}
.nav a:hover { color:var(--primary); background:var(--accent-soft); }
.nav a.active { color:var(--primary); background:var(--accent-soft); }
.nav a.active::after {
    content:'';
    position:absolute;
    bottom:-2px; left:50%;
    transform:translateX(-50%);
    width:20px; height:3px;
    background:var(--primary);
    border-radius:2px;
}

/* 汉堡菜单 */
.menu-toggle { display:none; flex-direction:column; gap:5px; padding:8px; }
.menu-toggle span {
    width:24px; height:2px;
    background:var(--dark);
    border-radius:2px;
    transition:all var(--transition);
}
.menu-toggle.active span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity:0; }
.menu-toggle.active span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }

/* ============================
   Hero / Banner
   ============================ */
.hero {
    position:relative;
    min-height:560px;
    display:flex;
    align-items:center;
    background:linear-gradient(135deg, #0D47A1 0%, #1565C0 50%, #1976D2 100%);
    overflow:hidden;
    margin-top:var(--header-h);
}
/* 科技感网格背景 */
.hero::before {
    content:'';
    position:absolute;
    inset:0;
    background-image:
        linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
    background-size:50px 50px;
    pointer-events:none;
}
/* 光晕 */
.hero::after {
    content:'';
    position:absolute;
    top:-100px; right:-100px;
    width:500px; height:500px;
    background:radial-gradient(circle, rgba(0,176,240,.15), transparent 70%);
    border-radius:50%;
    pointer-events:none;
}
.hero-content {
    position:relative;
    z-index:2;
    max-width:600px;
    color:#fff;
    padding:60px 0;
}
.hero-badge {
    display:inline-flex;
    align-items:center;
    gap:6px;
    padding:6px 14px;
    background:rgba(255,255,255,.12);
    border:1px solid rgba(255,255,255,.2);
    border-radius:30px;
    font-size:.85rem;
    margin-bottom:24px;
    backdrop-filter:blur(6px);
}
.hero-badge .dot {
    width:8px; height:8px;
    background:#4ade80;
    border-radius:50%;
    box-shadow:0 0 8px #4ade80;
    animation:pulse 2s infinite;
}
@keyframes pulse {
    0%,100% { opacity:1; }
    50% { opacity:.5; }
}
.hero h1 {
    font-size:2.8rem;
    font-weight:800;
    line-height:1.3;
    margin-bottom:16px;
}
.hero p { font-size:1.15rem; color:rgba(255,255,255,.85); margin-bottom:32px; }

/* 按钮 */
.btn {
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:12px 28px;
    border-radius:var(--radius-sm);
    font-size:.95rem;
    font-weight:600;
    transition:all var(--transition);
    cursor:pointer;
    border:none;
}
.btn-primary {
    background:#fff;
    color:var(--primary-dark);
}
.btn-primary:hover {
    background:var(--accent-soft);
    color:var(--primary-dark);
    transform:translateY(-2px);
    box-shadow:0 8px 24px rgba(0,0,0,.15);
}
.btn-outline {
    background:transparent;
    color:#fff;
    border:2px solid rgba(255,255,255,.4);
}
.btn-outline:hover {
    background:rgba(255,255,255,.1);
    border-color:#fff;
}
.btn-accent {
    background:var(--primary);
    color:#fff;
}
.btn-accent:hover {
    background:var(--primary-dark);
    transform:translateY(-2px);
    box-shadow:0 8px 24px rgba(21,101,192,.35);
}
.btn-group { display:flex; gap:16px; flex-wrap:wrap; }

/* 内页 Banner */
.page-banner {
    margin-top:var(--header-h);
    padding:80px 0;
    background:linear-gradient(135deg, #0D47A1 0%, #1565C0 50%, #1976D2 100%);
    position:relative;
    overflow:hidden;
    text-align:center;
}
.page-banner::before {
    content:'';
    position:absolute;
    inset:0;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size:40px 40px;
}
.page-banner h1 { font-size:2.2rem; color:#fff; font-weight:700; position:relative; z-index:2; }
.page-banner p { color:rgba(255,255,255,.8); margin-top:8px; position:relative; z-index:2; }

/* 面包屑 */
.breadcrumb {
    padding:16px 0;
    font-size:.85rem;
    color:var(--gray);
}
.breadcrumb a:hover { color:var(--primary); }
.breadcrumb span { margin:0 6px; }

/* ============================
   统计数据
   ============================ */
.stats {
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:30px;
    text-align:center;
}
.stat-item .num {
    font-size:2.5rem;
    font-weight:800;
    color:#fff;
    line-height:1;
}
.stat-item .label {
    margin-top:8px;
    font-size:.9rem;
    color:rgba(255,255,255,.7);
}

/* ============================
   服务卡片
   ============================ */
.service-grid {
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:24px;
}
.service-card {
    background:#fff;
    border:1px solid #e8edf2;
    border-radius:var(--radius);
    padding:32px 24px;
    transition:all var(--transition);
    position:relative;
    overflow:hidden;
}
.service-card::before {
    content:'';
    position:absolute;
    top:0; left:0;
    width:100%; height:3px;
    background:linear-gradient(90deg, var(--primary), var(--accent));
    transform:scaleX(0);
    transform-origin:left;
    transition:transform var(--transition);
}
.service-card:hover {
    transform:translateY(-6px);
    box-shadow:var(--shadow-lg);
    border-color:transparent;
}
.service-card:hover::before { transform:scaleX(1); }
.service-card .icon {
    width:56px; height:56px;
    border-radius:14px;
    background:var(--accent-soft);
    display:flex;
    align-items:center;
    justify-content:center;
    margin-bottom:20px;
    transition:all var(--transition);
}
.service-card:hover .icon {
    background:var(--primary);
    transform:scale(1.05);
}
.service-card .icon svg { width:28px; height:28px; color:var(--primary); transition:color var(--transition); }
.service-card:hover .icon svg { color:#fff; }
.service-card h3 {
    font-size:1.1rem;
    font-weight:600;
    margin-bottom:10px;
    color:var(--dark);
}
.service-card p {
    font-size:.9rem;
    color:var(--gray);
    line-height:1.6;
}
.service-card .tags {
    margin-top:16px;
    display:flex;
    flex-wrap:wrap;
    gap:6px;
}
.service-card .tag {
    font-size:.75rem;
    padding:3px 10px;
    background:var(--light);
    color:var(--gray);
    border-radius:20px;
    transition:all var(--transition);
}
.service-card:hover .tag { background:var(--accent-soft); color:var(--primary); }

/* ============================
   关于我们
   ============================ */
.about-grid {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:60px;
    align-items:center;
}
.about-text h2 { font-size:1.8rem; font-weight:700; margin-bottom:20px; }
.about-text p { color:var(--gray); margin-bottom:16px; }
.about-text .highlights {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:16px;
    margin-top:24px;
}
.about-text .highlight-item {
    display:flex;
    align-items:center;
    gap:10px;
    font-size:.9rem;
    color:var(--dark);
}
.about-text .highlight-item svg { width:20px; height:20px; color:var(--primary); flex-shrink:0; }

/* 关于右侧装饰 */
.about-visual {
    position:relative;
    aspect-ratio:1.2;
    border-radius:var(--radius-lg);
    background:linear-gradient(135deg,var(--primary-dark),var(--primary));
    overflow:hidden;
    display:flex;
    align-items:center;
    justify-content:center;
}
.about-visual::before {
    content:'';
    position:absolute;
    inset:0;
    background-image:
        linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
    background-size:40px 40px;
}
.about-visual .visual-content { position:relative; z-index:2; text-align:center; color:#fff; padding:40px; }
.about-visual .visual-content .big-num { font-size:3.5rem; font-weight:800; line-height:1; }
.about-visual .visual-content .desc { font-size:1rem; color:rgba(255,255,255,.8); margin-top:8px; }
.about-visual .ring {
    position:absolute;
    border:2px solid rgba(255,255,255,.1);
    border-radius:50%;
}
.about-visual .ring:nth-child(1) { width:200px; height:200px; top:20%; left:15%; }
.about-visual .ring:nth-child(2) { width:300px; height:300px; top:10%; left:5%; border-color:rgba(255,255,255,.05); }

/* ============================
   优势
   ============================ */
.advantage-grid {
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:24px;
}
.advantage-item {
    text-align:center;
    padding:32px 20px;
}
.advantage-item .icon-circle {
    width:72px; height:72px;
    margin:0 auto 20px;
    border-radius:50%;
    background:linear-gradient(135deg,var(--primary),var(--accent));
    display:flex;
    align-items:center;
    justify-content:center;
    box-shadow:0 8px 24px rgba(21,101,192,.2);
}
.advantage-item .icon-circle svg { width:32px; height:32px; color:#fff; }
.advantage-item h3 { font-size:1.05rem; font-weight:600; margin-bottom:8px; }
.advantage-item p { font-size:.85rem; color:var(--gray); }

/* ============================
   产品服务 - 筛选
   ============================ */
.filter-bar {
    background:#fff;
    border-radius:var(--radius);
    padding:24px;
    box-shadow:var(--shadow);
    margin-bottom:40px;
}
.filter-row {
    display:flex;
    align-items:flex-start;
    gap:12px;
    padding:10px 0;
    border-bottom:1px solid var(--light);
}
.filter-row:last-child { border-bottom:none; }
.filter-label {
    font-size:.85rem;
    font-weight:600;
    color:var(--dark);
    min-width:60px;
    padding-top:6px;
    flex-shrink:0;
}
.filter-tags { display:flex; flex-wrap:wrap; gap:8px; }
.filter-tag {
    padding:6px 16px;
    border-radius:20px;
    font-size:.85rem;
    color:var(--gray);
    background:var(--light);
    cursor:pointer;
    transition:all var(--transition);
    border:1px solid transparent;
}
.filter-tag:hover { color:var(--primary); border-color:var(--primary-light); }
.filter-tag.active { background:var(--primary); color:#fff; }

/* ============================
   CTA
   ============================ */
.cta-section {
    background:linear-gradient(135deg,var(--primary-dark),var(--primary));
    border-radius:var(--radius-lg);
    padding:60px 40px;
    text-align:center;
    position:relative;
    overflow:hidden;
}
.cta-section::before {
    content:'';
    position:absolute;
    inset:0;
    background-image:
        linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size:30px 30px;
}
.cta-section h2 { font-size:1.8rem; color:#fff; font-weight:700; position:relative; z-index:2; }
.cta-section p { color:rgba(255,255,255,.8); margin-top:12px; position:relative; z-index:2; }
.cta-section .btn-group { justify-content:center; margin-top:32px; position:relative; z-index:2; }

/* ============================
   检测流程 - 时间线
   ============================ */
.timeline {
    max-width:800px;
    margin:0 auto;
    position:relative;
}
.timeline::before {
    content:'';
    position:absolute;
    left:40px;
    top:0; bottom:0;
    width:2px;
    background:linear-gradient(to bottom, var(--primary), var(--accent), transparent);
}
.timeline-item {
    position:relative;
    padding-left:100px;
    padding-bottom:50px;
}
.timeline-item:last-child { padding-bottom:0; }
.timeline-dot {
    position:absolute;
    left:31px;
    top:0;
    width:20px; height:20px;
    background:#fff;
    border:4px solid var(--primary);
    border-radius:50%;
    box-shadow:0 0 0 4px var(--accent-soft);
}
.timeline-content {
    background:#fff;
    border:1px solid #e8edf2;
    border-radius:var(--radius);
    padding:24px 28px;
    transition:all var(--transition);
}
.timeline-content:hover {
    box-shadow:var(--shadow-lg);
    transform:translateX(6px);
    border-color:var(--primary-light);
}
.timeline-content .step-num {
    display:inline-block;
    padding:2px 12px;
    background:var(--accent-soft);
    color:var(--primary);
    border-radius:20px;
    font-size:.8rem;
    font-weight:600;
    margin-bottom:10px;
}
.timeline-content h3 { font-size:1.15rem; font-weight:600; margin-bottom:8px; }
.timeline-content p { font-size:.9rem; color:var(--gray); }
.timeline-content .details {
    margin-top:12px;
    display:flex;
    flex-wrap:wrap;
    gap:8px;
}
.timeline-content .detail-tag {
    font-size:.78rem;
    padding:4px 12px;
    background:var(--light);
    border-radius:6px;
    color:var(--gray);
}

/* ============================
   联系我们
   ============================ */
.contact-grid {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:40px;
}
.contact-info-card {
    background:#fff;
    border:1px solid #e8edf2;
    border-radius:var(--radius);
    padding:32px;
    transition:all var(--transition);
}
.contact-info-card:hover { box-shadow:var(--shadow); }
.contact-info-item {
    display:flex;
    align-items:flex-start;
    gap:16px;
    padding:20px 0;
    border-bottom:1px solid var(--light);
}
.contact-info-item:last-child { border-bottom:none; }
.contact-info-item .ci-icon {
    width:48px; height:48px;
    border-radius:12px;
    background:var(--accent-soft);
    display:flex;
    align-items:center;
    justify-content:center;
    flex-shrink:0;
}
.contact-info-item .ci-icon svg { width:24px; height:24px; color:var(--primary); }
.contact-info-item .ci-content h4 { font-size:.95rem; font-weight:600; margin-bottom:4px; }
.contact-info-item .ci-content p { font-size:.9rem; color:var(--gray); }
.contact-info-item .ci-content a { color:var(--primary); font-weight:600; }

/* 表单 */
.contact-form {
    background:#fff;
    border:1px solid #e8edf2;
    border-radius:var(--radius);
    padding:32px;
}
.contact-form h3 { font-size:1.2rem; font-weight:600; margin-bottom:24px; }
.form-group { margin-bottom:20px; }
.form-group label {
    display:block;
    font-size:.85rem;
    font-weight:600;
    margin-bottom:6px;
    color:var(--dark);
}
.form-group label .required { color:#dc2626; }
.form-control {
    width:100%;
    padding:12px 16px;
    border:1px solid #d1d9e0;
    border-radius:var(--radius-sm);
    font-size:.9rem;
    font-family:inherit;
    transition:all var(--transition);
    background:var(--lighter);
}
.form-control:focus {
    outline:none;
    border-color:var(--primary);
    background:#fff;
    box-shadow:0 0 0 3px rgba(21,101,192,.1);
}
textarea.form-control { resize:vertical; min-height:120px; }
.form-row {
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:16px;
}

/* 地图占位 */
.map-placeholder {
    margin-top:40px;
    height:360px;
    background:var(--light);
    border-radius:var(--radius);
    overflow:hidden;
    position:relative;
    border:1px solid #e8edf2;
}
.map-placeholder iframe { width:100%; height:100%; border:0; }

/* ============================
   FAQ
   ============================ */
.faq-list { max-width:800px; margin:0 auto; }
.faq-item {
    border:1px solid #e8edf2;
    border-radius:var(--radius-sm);
    margin-bottom:12px;
    overflow:hidden;
    transition:all var(--transition);
}
.faq-item:hover { border-color:var(--primary-light); }
.faq-question {
    padding:18px 24px;
    font-weight:600;
    font-size:.95rem;
    cursor:pointer;
    display:flex;
    justify-content:space-between;
    align-items:center;
    background:var(--lighter);
    transition:background var(--transition);
}
.faq-question:hover { background:var(--accent-soft); }
.faq-question .arrow {
    transition:transform var(--transition);
    flex-shrink:0;
    margin-left:12px;
}
.faq-question .arrow svg { width:18px; height:18px; color:var(--gray); }
.faq-item.open .faq-question .arrow { transform:rotate(180deg); }
.faq-answer {
    max-height:0;
    overflow:hidden;
    transition:max-height var(--transition);
}
.faq-answer-inner {
    padding:18px 24px;
    font-size:.9rem;
    color:var(--gray);
    line-height:1.7;
}
.faq-item.open .faq-answer { max-height:300px; }

/* ============================
   Footer
   ============================ */
.footer {
    background:var(--dark);
    color:rgba(255,255,255,.7);
    padding:60px 0 0;
}
.footer-grid {
    display:grid;
    grid-template-columns:2fr 1fr 1fr;
    gap:40px;
    padding-bottom:40px;
    border-bottom:1px solid rgba(255,255,255,.1);
}
.footer-brand h4 { color:#fff; font-size:1.1rem; margin-bottom:16px; }
.footer-brand p { font-size:.85rem; line-height:1.8; }
.footer-brand .footer-info { margin-top:16px; }
.footer-brand .footer-info li { font-size:.85rem; padding:4px 0; }
.footer-col h4 { color:#fff; font-size:1rem; margin-bottom:16px; }
.footer-col ul li { padding:6px 0; font-size:.85rem; }
.footer-col ul li a:hover { color:#fff; }
.footer-bottom {
    padding:20px 0;
    text-align:center;
    font-size:.8rem;
    color:rgba(255,255,255,.5);
}
.footer-bottom a { color:rgba(255,255,255,.5); }
.footer-bottom a:hover { color:#fff; }
.footer-links {
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:12px;
    margin-top:8px;
}
.footer-links a { font-size:.78rem; color:rgba(255,255,255,.4); }

/* ============================
   滚动顶部按钮
   ============================ */
.scroll-top {
    position:fixed;
    right:24px; bottom:24px;
    width:44px; height:44px;
    background:var(--primary);
    color:#fff;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
    cursor:pointer;
    opacity:0;
    visibility:hidden;
    transition:all var(--transition);
    z-index:999;
    box-shadow:0 4px 12px rgba(21,101,192,.3);
}
.scroll-top.show { opacity:1; visibility:visible; }
.scroll-top:hover { background:var(--primary-dark); transform:translateY(-3px); }

/* ============================
   动画
   ============================ */
.reveal {
    opacity:0;
    transform:translateY(30px);
    transition:opacity .6s ease, transform .6s ease;
}
.reveal.active { opacity:1; transform:translateY(0); }
.reveal:nth-child(2) { transition-delay:.1s; }
.reveal:nth-child(3) { transition-delay:.2s; }
.reveal:nth-child(4) { transition-delay:.3s; }
.reveal:nth-child(5) { transition-delay:.4s; }
.reveal:nth-child(6) { transition-delay:.5s; }
.reveal:nth-child(7) { transition-delay:.6s; }
.reveal:nth-child(8) { transition-delay:.7s; }

/* ============================
   响应式
   ============================ */
@media (max-width:1024px) {
    .service-grid { grid-template-columns:repeat(3,1fr); }
    .advantage-grid { grid-template-columns:repeat(2,1fr); }
    .stats { grid-template-columns:repeat(4,1fr); }
    .about-grid { grid-template-columns:1fr; gap:40px; }
}

@media (max-width:768px) {
    .section { padding:50px 0; }
    .section-title { font-size:1.6rem; }
    .hero { min-height:480px; }
    .hero h1 { font-size:1.8rem; }
    .hero p { font-size:1rem; }
    .hero-badge { font-size:.78rem; }

    /* 导航变汉堡 */
    .nav {
        position:fixed;
        top:var(--header-h);
        left:0; right:0;
        background:#fff;
        flex-direction:column;
        align-items:stretch;
        padding:12px;
        gap:4px;
        box-shadow:0 8px 24px rgba(0,0,0,.1);
        transform:translateY(-200%);
        transition:transform var(--transition);
        max-height:calc(100vh - var(--header-h));
        overflow-y:auto;
    }
    .nav.open { transform:translateY(0); }
    .nav a { padding:14px 16px; border-radius:var(--radius-sm); }
    .nav a.active::after { display:none; }
    .menu-toggle { display:flex; }

    .service-grid { grid-template-columns:1fr; }
    .advantage-grid { grid-template-columns:repeat(2,1fr); }
    .stats { grid-template-columns:repeat(2,1fr); gap:24px; }
    .stat-item .num { font-size:2rem; }
    .about-text .highlights { grid-template-columns:1fr; }
    .contact-grid { grid-template-columns:1fr; }
    .form-row { grid-template-columns:1fr; }
    .footer-grid { grid-template-columns:1fr; gap:30px; }
    .timeline::before { left:20px; }
    .timeline-item { padding-left:60px; }
    .timeline-dot { left:11px; }
    .cta-section { padding:40px 24px; }
    .cta-section h2 { font-size:1.4rem; }
    .btn { padding:10px 22px; font-size:.88rem; }
    .btn-group { flex-direction:column; }
    .btn-group .btn { width:100%; justify-content:center; }
    .logo-text { font-size:.95rem; }
    .logo-text small { font-size:.65rem; }
    .container { padding:0 16px; }
}

@media (max-width:480px) {
    .hero h1 { font-size:1.5rem; }
    .section-title { font-size:1.4rem; }
    .stats { grid-template-columns:repeat(2,1fr); }
    .advantage-grid { grid-template-columns:1fr; }
    .logo svg { width:30px; height:30px; }
    .logo-text { font-size:.85rem; }
    .logo-text small { display:none; }
}

/* 打印 */
@media print {
    .header,.scroll-top,.menu-toggle { display:none; }
    .hero,.page-banner { min-height:auto; padding:20px 0; }
}