/* ============================================================
   网络公司官网 - 前台样式（现代响应式模板）
   配色：深蓝 + 品牌蓝 + 青色渐变，科技感
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-deep: #0f1f4d;
    --accent: #06b6d4;
    --gradient: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
    --gradient-deep: linear-gradient(135deg, #0f1f4d 0%, #1b3a8f 45%, #0e7490 100%);
    --text: #1f2937;
    --muted: #6b7280;
    --bg: #ffffff;
    --bg-alt: #f6f8fc;
    --border: #e5e7eb;
    --radius: 14px;
    --radius-sm: 9px;
    --shadow-sm: 0 2px 8px rgba(15, 31, 77, .06);
    --shadow: 0 10px 30px rgba(15, 31, 77, .09);
    --shadow-lg: 0 20px 50px rgba(15, 31, 77, .14);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* ---------- 基础 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    color: var(--text);
    line-height: 1.7;
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
::selection { background: rgba(37, 99, 235, .18); }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 顶部信息条 ---------- */
.topbar {
    background: var(--primary-deep);
    color: rgba(255, 255, 255, .82);
    font-size: 13px;
    padding: 7px 0;
}
.topbar-inner { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.topbar-item { margin-right: 18px; white-space: nowrap; }
.topbar-right .topbar-item { margin-right: 0; margin-left: 18px; }
.topbar a:hover { color: #fff; }

/* ---------- 导航 ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, .92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(15, 31, 77, .06);
    transition: box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 20px; }

.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
    width: 42px; height: 42px;
    display: grid; place-items: center;
    background: var(--gradient);
    color: #fff; font-weight: 800; font-size: 22px;
    border-radius: 12px;
    box-shadow: 0 6px 16px rgba(37, 99, 235, .35);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-size: 19px; font-weight: 800; color: var(--primary-deep); letter-spacing: .5px; }
.brand-slogan { font-size: 11.5px; color: var(--muted); }

.main-nav { display: flex; align-items: center; gap: 26px; }
.nav-list { display: flex; align-items: center; gap: 6px; }
.nav-link {
    display: block;
    padding: 8px 14px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    border-radius: 8px;
    transition: color .2s, background .2s;
    position: relative;
}
.nav-link:hover { color: var(--primary); background: rgba(37, 99, 235, .06); }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
    content: '';
    position: absolute;
    left: 14px; right: 14px; bottom: 3px;
    height: 2.5px;
    border-radius: 2px;
    background: var(--gradient);
}
.nav-cta { margin-left: 4px; }

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px; height: 42px;
    background: none; border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
}
.nav-toggle span {
    height: 2.5px; width: 100%;
    background: var(--primary-deep);
    border-radius: 2px;
    transition: transform .3s, opacity .3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 26px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: transform .2s, box-shadow .2s, background .2s, color .2s;
    white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--gradient); color: #fff; box-shadow: 0 8px 20px rgba(37, 99, 235, .35); }
.btn-primary:hover { box-shadow: 0 12px 28px rgba(37, 99, 235, .45); }
.btn-light { background: #fff; color: var(--primary-deep); box-shadow: 0 8px 24px rgba(0, 0, 0, .18); }
.btn-light:hover { box-shadow: 0 12px 30px rgba(0, 0, 0, .25); }
.btn-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-block { width: 100%; }

/* ---------- Hero 轮播 ---------- */
.hero {
    position: relative;
    overflow: hidden;
    min-height: 560px;
    background: var(--primary-deep);
}
.hero-slides { position: relative; height: 560px; }
.hero-slide {
    position: absolute; inset: 0;
    display: flex; align-items: center;
    opacity: 0;
    transition: opacity .8s ease;
    visibility: hidden;
    pointer-events: none;
}
.hero-slide.active { opacity: 1; visibility: visible; pointer-events: auto; }
.hero-bg {
    position: absolute; inset: 0;
    background-size: cover; background-position: center;
}
.hero-bg::after {
    content: '';
    position: absolute; inset: 0;
    background:
        radial-gradient(600px 300px at 80% 20%, rgba(6, 182, 212, .35), transparent 70%),
        radial-gradient(500px 300px at 10% 80%, rgba(37, 99, 235, .45), transparent 70%);
}
.hero-content { position: relative; z-index: 2; color: #fff; max-width: 680px; }
.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    font-size: 13px;
    letter-spacing: 1px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .14);
    border: 1px solid rgba(255, 255, 255, .25);
    backdrop-filter: blur(4px);
    margin-bottom: 22px;
}
.hero-title { font-size: clamp(30px, 4.6vw, 50px); line-height: 1.25; font-weight: 800; letter-spacing: .5px; margin-bottom: 18px; }
.hero-subtitle { font-size: clamp(15px, 2vw, 18px); color: rgba(255, 255, 255, .88); margin-bottom: 32px; max-width: 560px; }

.hero-dots {
    position: absolute;
    bottom: 26px; left: 0; right: 0;
    display: flex; justify-content: center; gap: 10px;
    z-index: 5;
}
.hero-dot {
    width: 10px; height: 10px;
    border-radius: 999px;
    border: none;
    background: rgba(255, 255, 255, .4);
    cursor: pointer;
    transition: width .3s, background .3s;
}
.hero-dot.active { width: 30px; background: #fff; }

/* ---------- 通用 section ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.section-eyebrow {
    display: inline-block;
    font-size: 12.5px;
    font-weight: 700;
    letter-spacing: 2.5px;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 10px;
}
.section-title { font-size: clamp(24px, 3.4vw, 34px); font-weight: 800; color: var(--primary-deep); margin-bottom: 12px; }
.section-desc { color: var(--muted); }
.section-more { text-align: center; margin-top: 42px; }

/* ---------- 统计 ---------- */
.section-stats { padding: 0; }
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 34px;
    background: var(--gradient);
    border-radius: 18px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-46px);
    margin-bottom: -46px;
    position: relative;
    z-index: 4;
}
.stat-item { text-align: center; color: #fff; }
.stat-num { display: block; font-size: 40px; font-weight: 800; line-height: 1.2; }
.stat-label { font-size: 14px; color: rgba(255, 255, 255, .85); }

/* ---------- 栅格与卡片 ---------- */
.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform .3s ease, box-shadow .3s ease, border-color .3s;
}
a.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: rgba(37, 99, 235, .3); }

.card-thumb-wrap { position: relative; }
.card-thumb, .thumb-placeholder { width: 100%; height: 200px; object-fit: cover; }
.thumb-placeholder {
    display: grid; place-items: center;
    background: linear-gradient(135deg, #e8efff 0%, #d6f4f9 100%);
}
.thumb-placeholder span { font-size: 46px; font-weight: 800; color: rgba(37, 99, 235, .35); }
.card-category {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12.5px;
    font-weight: 600;
    border-radius: 999px;
    background: rgba(37, 99, 235, .1);
    color: var(--primary);
}
.card-thumb-wrap .card-category {
    position: absolute;
    left: 14px; top: 14px;
    background: rgba(255, 255, 255, .92);
    color: var(--primary-deep);
    box-shadow: var(--shadow-sm);
}
.card-body { padding: 22px; }
.card-title { font-size: 17.5px; font-weight: 700; margin: 10px 0 8px; color: var(--primary-deep); line-height: 1.45; }
.card-text { font-size: 14px; color: var(--muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-more { display: inline-block; margin-top: 14px; font-size: 14px; font-weight: 600; color: var(--primary); }

/* 案例卡片 */
.case-card .card-thumb, .case-card .thumb-placeholder { height: 190px; }
.case-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.case-client { font-size: 12.5px; color: var(--muted); }

/* 特性卡片 */
.feature-card { text-align: center; padding: 34px 22px; }
.feature-icon { font-size: 36px; display: block; margin-bottom: 14px; }
.feature-card h3 { font-size: 17px; margin-bottom: 8px; color: var(--primary-deep); }
.feature-card p { font-size: 14px; color: var(--muted); }

/* ---------- 关于（首页 intro） ---------- */
.about-intro { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.about-intro-text p { color: var(--muted); margin-bottom: 24px; }
.about-intro-features { display: flex; flex-direction: column; gap: 18px; }
.feature-item {
    display: flex; align-items: flex-start; gap: 16px;
    background: #fff;
    padding: 18px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}
.feature-item .feature-icon { font-size: 26px; margin: 0; }
.feature-item strong { color: var(--primary-deep); }
.feature-item p { font-size: 13.5px; color: var(--muted); }

/* ---------- 页面横幅 / 面包屑 ---------- */
.page-hero {
    background: var(--gradient-deep);
    color: #fff;
    padding: 64px 0 58px;
    position: relative;
    overflow: hidden;
}
.page-hero::after {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(500px 260px at 85% 30%, rgba(6, 182, 212, .3), transparent 70%);
}
.page-hero .container { position: relative; z-index: 2; }
.page-hero-title { font-size: clamp(26px, 3.6vw, 38px); font-weight: 800; margin-bottom: 10px; }
.breadcrumb { display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255, 255, 255, .7); }
.breadcrumb a:hover { color: #fff; }

/* ---------- 分类筛选 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 44px; }
.filter-chip {
    padding: 9px 22px;
    font-size: 14px;
    border-radius: 999px;
    background: #fff;
    border: 1.5px solid var(--border);
    color: var(--muted);
    cursor: pointer;
    transition: all .25s;
}
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--gradient); color: #fff; border-color: transparent; box-shadow: 0 6px 16px rgba(37, 99, 235, .3); }

/* ---------- 分页 ---------- */
.pagination { display: flex; justify-content: center; align-items: center; gap: 8px; margin-top: 48px; flex-wrap: wrap; }
.page-link {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 40px; height: 40px;
    padding: 0 12px;
    font-size: 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    transition: all .2s;
}
.page-link:hover { border-color: var(--primary); color: var(--primary); }
.page-link.active { background: var(--gradient); color: #fff; border-color: transparent; }
.page-link.disabled { opacity: .45; pointer-events: none; }
.page-ellipsis { color: var(--muted); padding: 0 4px; }

/* ---------- 关于页 ---------- */
.about-page-main { display: grid; grid-template-columns: 1fr 1.25fr; gap: 48px; align-items: start; }
.about-page-image .about-image, .about-page-image .thumb-placeholder { width: 100%; height: 100%; min-height: 380px; border-radius: var(--radius); object-fit: cover; }
.about-page-text .rich-text { color: #374151; }
.about-vm { margin-top: 56px; }
.vm-card { padding: 34px; }
.vm-icon { font-size: 34px; }
.vm-card h3 { font-size: 19px; margin: 12px 0 10px; color: var(--primary-deep); }
.vm-card p { color: var(--muted); }

/* ---------- 详情页 ---------- */
.product-detail-main { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: start; margin-bottom: 44px; }
.product-detail-thumb .detail-image, .product-detail-thumb .thumb-placeholder { width: 100%; height: 100%; min-height: 400px; border-radius: var(--radius); object-fit: cover; }
.product-detail-info h2 { font-size: 28px; color: var(--primary-deep); margin: 14px 0 12px; }
.product-detail-summary { color: var(--muted); margin-bottom: 26px; font-size: 15.5px; }
.product-detail-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.product-highlights { margin-top: 6px; }
.product-highlights li { padding: 8px 0; font-size: 14.5px; color: #374151; border-bottom: 1px dashed var(--border); }

.detail-content { padding: 38px; }
.detail-content h3 { font-size: 22px; color: var(--primary-deep); margin-bottom: 18px; padding-bottom: 14px; border-bottom: 2px solid rgba(37, 99, 235, .12); }
.rich-text { font-size: 15.5px; color: #374151; line-height: 1.9; }
.rich-text p { margin-bottom: 14px; }
.rich-text ul, .rich-text ol { padding-left: 22px; margin-bottom: 14px; }
.rich-text li { margin-bottom: 6px; }
.rich-text li::marker { color: var(--primary); }

.related-section { margin-top: 52px; }
.related-title { font-size: 21px; color: var(--primary-deep); margin-bottom: 22px; }

.detail-banner { width: 100%; max-height: 420px; object-fit: cover; border-radius: var(--radius); margin-bottom: 28px; }
.case-detail-meta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.meta-chip {
    padding: 6px 16px;
    font-size: 13.5px;
    border-radius: 999px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    color: #374151;
}
.case-summary {
    padding: 18px 22px;
    border-left: 4px solid var(--primary);
    background: var(--bg-alt);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 26px;
    color: var(--primary-deep);
    font-weight: 500;
    font-size: 15.5px;
}
.case-detail-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; padding-top: 24px; border-top: 1px solid var(--border); }

/* ---------- 联系页 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 52px; align-items: start; }
.contact-info > p { color: var(--muted); margin-bottom: 30px; }
.contact-list { display: flex; flex-direction: column; gap: 0; }
.contact-list li {
    display: flex; align-items: flex-start; gap: 16px;
    padding: 16px 0;
    border-bottom: 1px dashed var(--border);
}
.contact-icon {
    width: 46px; height: 46px;
    flex-shrink: 0;
    display: grid; place-items: center;
    font-size: 20px;
    background: rgba(37, 99, 235, .08);
    border-radius: 12px;
}
.contact-list strong { display: block; font-size: 13.5px; color: var(--muted); font-weight: 600; margin-bottom: 2px; }
.contact-list a, .contact-list span { color: var(--primary-deep); font-weight: 600; font-size: 15.5px; }
.contact-list a:hover { color: var(--primary); }

.contact-form-card { padding: 34px; }
.contact-form-card h3 { font-size: 21px; color: var(--primary-deep); margin-bottom: 6px; }
.form-tip { font-size: 13.5px; color: var(--muted); margin-bottom: 22px; }
.required { color: #ef4444; }
.form { display: flex; flex-direction: column; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { display: flex; flex-direction: column; gap: 7px; }
.form-group label { font-size: 14px; font-weight: 600; color: #374151; }
.form-group input, .form-group textarea {
    padding: 12px 15px;
    font-size: 14.5px;
    font-family: inherit;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color .2s, box-shadow .2s;
    background: #fbfcfe;
    resize: vertical;
}
.form-group input:focus, .form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, .1);
    background: #fff;
}

/* ---------- CTA ---------- */
.cta { background: var(--gradient); color: #fff; padding: 58px 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.cta h2 { font-size: clamp(22px, 3vw, 30px); font-weight: 800; margin-bottom: 8px; }
.cta p { color: rgba(255, 255, 255, .88); }

/* ---------- 页脚 ---------- */
.site-footer { background: #0b1533; color: rgba(255, 255, 255, .75); }
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 44px;
    padding: 60px 24px 44px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand-name { font-size: 19px; font-weight: 800; color: #fff; }
.footer-about p { font-size: 14px; line-height: 1.9; }
.footer-col h4 {
    font-size: 15.5px; color: #fff;
    margin-bottom: 18px;
    letter-spacing: .5px;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a, .footer-contact a { font-size: 14px; transition: color .2s, padding-left .2s; }
.footer-links a:hover { color: #4fc3f7; padding-left: 4px; }
.footer-contact li { font-size: 14px; margin-bottom: 12px; display: flex; gap: 8px; }
.footer-contact a:hover { color: #4fc3f7; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .09); }
.footer-bottom-inner {
    display: flex; justify-content: space-between; align-items: center;
    gap: 12px; flex-wrap: wrap;
    padding: 18px 24px;
    font-size: 13px;
}
.footer-bottom a { margin-left: 16px; }
.footer-bottom a:hover { color: #fff; }
.admin-link { opacity: .6; }

/* ---------- 提示 ---------- */
.flash {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    margin: 24px 0 0;
    font-size: 14.5px;
    font-weight: 500;
}
.flash-success { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.flash-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

.empty-tip {
    text-align: center;
    padding: 60px 20px;
    color: var(--muted);
    background: var(--bg-alt);
    border-radius: var(--radius);
    border: 1.5px dashed var(--border);
}

/* ---------- 404 ---------- */
.not-found { text-align: center; padding: 70px 20px; }
.nf-code {
    font-size: clamp(80px, 14vw, 140px);
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1;
}
.not-found h1 { font-size: 26px; margin: 16px 0 10px; color: var(--primary-deep); }
.not-found p { color: var(--muted); margin-bottom: 30px; }

/* ---------- 滚动显现动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

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

@media (max-width: 860px) {
    .main-nav {
        position: fixed;
        top: 0; right: -320px;
        width: 300px; height: 100vh;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 8px;
        background: #fff;
        box-shadow: var(--shadow-lg);
        padding: 90px 22px 30px;
        transition: right .32s ease;
        z-index: 101;
        overflow-y: auto;
    }
    .main-nav.open { right: 0; }
    .nav-list { flex-direction: column; align-items: stretch; gap: 4px; }
    .nav-link { padding: 13px 16px; font-size: 16px; }
    .nav-link.active::after { display: none; }
    .nav-link.active { background: rgba(37, 99, 235, .08); }
    .nav-cta { margin: 12px 0 0; }
    .nav-toggle { display: flex; }

    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .about-intro, .about-page-main, .product-detail-main, .contact-grid { grid-template-columns: 1fr; gap: 36px; }
    .hero, .hero-slides { min-height: 480px; height: 480px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; padding: 26px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .section { padding: 62px 0; }
}

@media (max-width: 560px) {
    .container { padding: 0 18px; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); padding: 22px; transform: translateY(-34px); margin-bottom: -34px; }
    .stat-num { font-size: 30px; }
    .topbar-inner { justify-content: center; }
    .detail-content { padding: 24px; }
    .contact-form-card { padding: 24px; }
    .cta-inner { justify-content: center; text-align: center; }
    .product-detail-actions .btn { width: 100%; }
}

/* ---------- 修复：禁止手机端页面左右横向拖动 ----------
   原因：移动端导航抽屉关闭时停在屏幕外右侧(right:-320px)，
   把页面撑宽约 320px，导致整页可以左右拉。
   用 overflow-x: clip 裁剪（不破坏 sticky 吸顶导航），
   旧浏览器回退到 overflow-x: hidden。 */
html, body { overflow-x: hidden; }
@supports (overflow: clip) {
    html, body { overflow-x: clip; }
}