/* ============================================================
   AUMI Bio — 全站共享样式 (main.css)
   版本: 20260814-1
   说明:
   - 动态主题变量 (:root / --hero-gradient / --logo-icon-bg)
     由 includes/header.php 内联输出, 本文件只含静态样式
   - 页面私有样式仍通过 $extraStyle 内联注入
   ============================================================ */

/* ── Reset & Base ── */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans JP', sans-serif;
    color: #1a1a2e;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Header ── */
.header {
    position: fixed; top: 0; left: 0; right: 0;
    height: var(--header-height);
    background: rgba(255,255,255,.97);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    display: flex; align-items: center;
}
.header-inner {
    width: 100%; max-width: var(--max-width);
    margin: 0 auto; padding: 0 40px;
    display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon { width: 36px; height: 36px; background: var(--logo-icon-bg); border-radius: 4px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; font-weight: 800; flex-shrink: 0; }
.logo-img { height: 40px; width: auto; max-width: 150px; object-fit: contain; flex-shrink: 0; }
.logo-text { display: flex; flex-direction: column; justify-content: center; line-height: 1.2; }
.logo-brand { font-weight: 700; font-size: 15px; letter-spacing: 0.5px; color: var(--text-secondary); white-space: nowrap; }
.logo-sub-en { font-weight: 500; color: var(--text-muted); font-size: 9px; letter-spacing: 0.2px; text-transform: uppercase; white-space: nowrap; margin-top: 2px; }
.logo-brand-en { text-transform: uppercase; font-size: 12px; letter-spacing: 0.3px; line-height: 1.3; white-space: nowrap; }
.nav { display: flex; gap: 16px; align-items: center; }
.nav a { text-decoration: none; color: var(--text-secondary); font-size: 14px; font-weight: 500; transition: color .2s; position: relative; white-space: nowrap; }
.nav a:hover, .nav a.active { color: var(--primary); }
.nav a::after { content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px; background: var(--primary); transform: scaleX(0); transition: transform .2s; }
.nav a:hover::after, .nav a.active::after { transform: scaleX(1); }
.lang-switch { display: flex; gap: 6px; align-items: center; font-size: 13px; color: var(--text-muted); margin-left: 12px; padding-left: 12px; border-left: 1px solid var(--border); }
.lang-switch a { color: var(--text-muted); text-decoration: none; padding: 2px 6px; border-radius: 4px; transition: all .2s; }
.lang-switch a:hover, .lang-switch a.active { color: var(--primary); background: var(--primary-light); }
.gt-switch { margin-left: 8px; }
.gt-switch select { font-size: 12px; padding: 3px 6px; border-radius: 4px; border: 1px solid var(--border); background: var(--white); color: var(--text-secondary); cursor: pointer; }
.goog-te-banner-frame { display: none !important; }
.goog-te-gadget { font-size: 0 !important; }
.goog-te-gadget .goog-te-combo { margin: 0 !important; }
body { top: 0 !important; }
.goog-tooltip, .goog-tooltip:hover { display: none !important; }
.goog-text-highlight { background: none !important; box-shadow: none !important; }
.mobile-toggle { display: none; background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text); padding: 8px; border-radius: 6px; transition: background .2s; }
.mobile-toggle:active { background: var(--bg-lighter); }
.mobile-toggle .icon-close { display: none; }
.mobile-toggle.open .icon-menu { display: none; }
.mobile-toggle.open .icon-close { display: inline; }
.mobile-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,.45); z-index: 998; backdrop-filter: blur(2px); }
@media (min-width: 769px) {
    .mobile-overlay { display: none !important; }
}

/* ── Member Menu (desktop) ── */
.member-menu { display: flex; align-items: center; gap: 8px; margin-left: 8px; padding-left: 8px; border-left: 1px solid var(--border); }
.member-menu a { font-size: 14px; text-decoration: none; color: var(--text-secondary); }
.member-menu a:hover { color: var(--primary); }
.member-name-link { color: var(--primary) !important; font-weight: 500; display: inline-flex; align-items: center; gap: 6px; }
.member-logout-form { display: inline; }
.member-logout-btn { background: none; border: none; font-size: 13px; color: var(--text-muted); cursor: pointer; padding: 0; }
.member-logout-btn:hover { color: var(--primary); }

/* ── Hero (首页) ── */
.hero {
    margin-top: var(--header-height);
    min-height: 85vh;
    display: flex; align-items: center; justify-content: center;
    position: relative; overflow: hidden;
    background: var(--hero-gradient);
    /* 创建独立层叠上下文：防止 iOS Safari 上 <video> 突破 fixed header 的层级覆盖 */
    z-index: 1;
    transform: translateZ(0);
}
.hero-bg-video {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover; z-index: -1; pointer-events: none;
}
.hero-bg-image {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover; background-position: center; z-index: -1;
}
.hero-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 1;
}
.hero-content { position: relative; z-index: 2; text-align: center; color: #fff; padding: 0 40px; max-width: 800px; }
.hero-badge { display: inline-block; font-size: 14px; font-weight: 500; letter-spacing: 3px; text-transform: uppercase; color: rgba(255,255,255,.7); margin-bottom: 24px; }
.hero-title { font-size: clamp(36px,5.5vw,64px); font-weight: 800; line-height: 1.15; margin-bottom: 24px; letter-spacing: -1.5px; }
.hero-desc { font-size: clamp(16px,1.5vw,19px); color: rgba(255,255,255,.8); max-width: 640px; margin: 0 auto 36px; line-height: 1.7; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ── Page Banner (子页面横幅) ── */
.page-banner {
    margin-top: var(--header-height);
    background: var(--hero-gradient);
    padding: 80px 40px; text-align: center; color: #fff;
}
.page-banner h1 { font-size: clamp(28px, 4vw, 48px); font-weight: 800; letter-spacing: -1px; margin-bottom: 12px; }
.page-banner p { font-size: 17px; color: rgba(255,255,255,.75); max-width: 600px; margin: 0 auto; line-height: 1.7; }
.page-banner__bg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; }
.page-banner__overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,.45); z-index: 1; }
.page-banner__content { position: relative; z-index: 2; }

/* ── 通用 Section ── */
section { padding: 100px 40px; }
.section-inner { max-width: var(--max-width); margin: 0 auto; }
.section-label { font-size: 13px; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; }
.section-heading { font-size: clamp(28px, 3.5vw, 42px); font-weight: 700; line-height: 1.2; margin-bottom: 20px; letter-spacing: -.8px; color: var(--text); }
.section-desc { font-size: 17px; color: var(--text-secondary); max-width: 680px; line-height: 1.75; white-space: pre-line; }
.section--alt { background: var(--bg-light); }
.section--dark { background: var(--primary-dark); color: #fff; }
.section--dark .section-heading, .section--dark .section-label, .section--dark .section-desc { color: #fff; }
.section--dark .stat-card__number, .section--dark .stat-card__label { color: #fff; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 40px; }

/* ── 首页布局工具类 ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; margin-top: 56px; }
.text-center { text-align: center; }
.media-frame { aspect-ratio: 4/3; border-radius: var(--radius); overflow: hidden; }
.media-frame video { width: 100%; height: 100%; object-fit: cover; }
.media-bg { border-radius: var(--radius); aspect-ratio: 4/3; background-position: center; background-size: cover; }
.home-icon-box { width: 48px; height: 48px; background: var(--primary-light); border-radius: 8px; display: flex; align-items: center; justify-content: center; color: var(--primary); margin-bottom: 20px; }
.home-card-title { font-size: 20px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.home-card-desc { font-size: 14.5px; color: var(--text-secondary); line-height: 1.65; flex: 1; margin-bottom: 20px; }
.home-explore-link { background: var(--bg-lighter); border-radius: var(--radius); padding: 48px 32px; text-decoration: none; color: var(--text); border: 1px solid var(--border); text-align: left; display: block; }
.explore-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.explore-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.stat-num { font-size: clamp(36px,4.5vw,52px); font-weight: 800; color: #1e3a7a; line-height: 1; margin-bottom: 12px; letter-spacing: -1px; }
.stat-label { font-size: 15px; color: #333; max-width: 240px; margin: 0 auto; line-height: 1.5; }

/* ── 按钮 ── */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 6px; font-size: 15px; font-weight: 600; text-decoration: none; transition: all .25s; cursor: pointer; border: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.35); }
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.1); }
.btn-text { background: none; color: var(--primary); padding: 8px 0; font-weight: 600; display: inline-flex; align-items: center; gap: 6px; transition: gap .2s; border: none; cursor: pointer; font-size: 15px; text-decoration: none; }
.btn-text:hover { gap: 12px; }
.btn-text svg { width: 18px; height: 18px; }

/* ── 卡片 ── */
.card-grid { display: grid; gap: 28px; }
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--4 { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--white); border-radius: var(--radius); padding: 36px 28px; border: 1px solid var(--border); }
.card--business { transition: all .3s; }
.card--business:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.card__icon {
    width: 56px; height: 56px; margin-bottom: 20px;
    display: flex; align-items: center; justify-content: center;
    background: var(--primary-light);
    border-radius: 12px;
    color: var(--primary);
    font-size: 28px;
}
.card__icon svg { width: 28px; height: 28px; }
.card__title { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.card__desc { font-size: 14.5px; color: var(--text-secondary); line-height: 1.65; white-space: pre-line; }

/* ── 数据统计 ── */
.stats { background: var(--bg-lighter); }
.stats__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.stat-card { padding: 40px 24px; text-align: center; }
.stat-card__number { font-size: clamp(36px, 4.5vw, 52px); font-weight: 800; color: var(--primary-dark); line-height: 1; margin-bottom: 12px; letter-spacing: -1px; }
.stat-card__label { font-size: 15px; color: var(--text-secondary); max-width: 240px; margin: 0 auto; line-height: 1.5; }

/* ── Overview / Feature 占位图 ── */
.overview-image, .feature-image, .sustainability-image, .science-image {
    border-radius: var(--radius);
    aspect-ratio: 4/3;
    display: flex; align-items: center; justify-content: center;
    font-size: 64px;
}
.overview-image { background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg-light) 100%); }
.feature-image { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent) 100%); color: #fff; }
.sustainability-image { background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg-light) 100%); }
.science-image { background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent) 100%); color: #fff; }

/* ── 页脚（深蓝底 + 白字，与首页数据统计板块完全同色） ── */
.footer-links {
    background: var(--primary-dark);
    border-top: none;
    border-bottom: none;
    color: #fff;
}
.footer-links-inner { max-width: var(--max-width); margin: 0 auto; padding: 60px 40px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 48px; }
.footer-col h5 { font-size: 14px; font-weight: 600; color: #fff; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
.footer-col p { font-size: 14px; color: rgba(255,255,255,.82); line-height: 1.6; margin-bottom: 12px; }
.footer-col--about .btn-text,
.footer-col--biz .btn-text {
    display: inline-flex; align-items: center; gap: 6px; font-size: 13px;
    color: #fff; text-decoration: none; font-weight: 500;
    border-bottom: 1px solid rgba(255,255,255,.4); padding-bottom: 2px;
}
.footer-col--about .btn-text:hover,
.footer-col--biz .btn-text:hover { border-color: #fff; }
.footer-col--about .btn-text svg,
.footer-col--biz .btn-text svg { width: 14px; height: 14px; }
.footer-contact-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    margin: 6px 0;
    border-radius: 8px;
    text-decoration: none;
    color: #fff;
    font-size: 14px;
    min-height: 40px;
    transition: background .2s;
}
.footer-contact-link:hover { background: rgba(255,255,255,.1); }
.footer-contact-link strong { display: block; font-weight: 600; color: #fff; font-size: 14px; }
.footer-contact-link em { display: block; font-style: normal; font-size: 12px; color: rgba(255,255,255,.65); margin-top: 2px; }
.footer-contact-link--static { cursor: default; }
.footer-contact-icon {
    width: 34px; height: 34px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(255,255,255,.15);
    border-radius: 8px;
    flex-shrink: 0;
    color: #fff;
}

/* ── 二维码列 ── */
.footer-qr-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px 12px;
}
.footer-qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: inherit;
}
.footer-qr-box {
    width: 100%;
    aspect-ratio: 1 / 1;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 10px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform .2s, box-shadow .2s;
}
.footer-qr-item:hover .footer-qr-box {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,.25);
}
/* 伪二维码样式：用渐变 + 角标模拟，未来替换成 <img> 即可 */
.footer-qr-box::before {
    content: "";
    position: absolute;
    inset: 6px;
    background-color: #d0d5dd;
    background-image:
        radial-gradient(circle at 25% 25%, #555 2px, transparent 2.5px),
        radial-gradient(circle at 75% 25%, #555 2px, transparent 2.5px),
        radial-gradient(circle at 25% 75%, #555 2px, transparent 2.5px),
        radial-gradient(circle at 75% 75%, #555 2px, transparent 2.5px),
        radial-gradient(circle at 50% 50%, #444 1.5px, transparent 2px);
    background-size: 10px 10px, 10px 10px, 10px 10px, 10px 10px, 8px 8px;
    border-radius: 4px;
    opacity: .5;
}
.footer-qr-icon {
    position: relative;
    z-index: 2;
    width: 36px;
    height: 36px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.footer-qr-icon .icon-wechat   { color: #07C160; }
.footer-qr-icon .icon-whatsapp { color: #25D366; }
.footer-qr-icon .icon-facebook { color: #1877F2; }
.footer-qr-icon .icon-instagram {
    color: #E4405F;
    background: linear-gradient(45deg,#f09433 0%,#e6683c 25%,#dc2743 50%,#cc2366 75%,#bc1888 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.footer-qr-label {
    font-size: 12px;
    color: rgba(255,255,255,.85);
    font-weight: 500;
    text-align: center;
    line-height: 1.3;
}
.footer-qr-tip {
    margin-top: 12px;
    padding: 8px 10px;
    background: var(--primary-light);
    border-radius: 6px;
    font-size: 12px;
    color: var(--primary);
    line-height: 1.5;
}

.footer-main { background: var(--white); padding: 32px 40px; }
.footer-main-inner { max-width: var(--max-width); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-legal { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-legal a { font-size: 13px; color: var(--text-muted); text-decoration: none; }
.footer-legal a:hover { color: var(--primary); }
.footer-copy { font-size: 13px; color: var(--text-muted); }

/* ── 防盗图：禁止拖拽图片 ── */
img {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}
/* 右下角提示条 */
.img-protect-toast {
    position: fixed;
    bottom: 30px;
    right: 20px;
    background: rgba(0,0,0,.75);
    color: #fff;
    padding: 10px 18px;
    border-radius: 6px;
    font-size: 13px;
    z-index: 9999;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity .3s, transform .3s;
    pointer-events: none;
}
.img-protect-toast.show {
    opacity: 1;
    transform: translateY(0);
}

/* ── About 页 ── */
.about-overview__header {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 32px;
}
.about-overview__logo {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.about-overview__logo img {
    width: 80px;
    height: 80px;
    object-fit: contain;
}
.about-overview__title {
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.about-overview__title .section-heading {
    margin-bottom: 0;
    font-size: clamp(28px, 3.5vw, 42px);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -.8px;
    color: var(--text);
}
.about-overview__en {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    margin-top: 6px;
    text-transform: uppercase;
}
.about-overview__desc .section-desc {
    max-width: none;
    font-size: 16px;
    line-height: 1.8;
}

/* ── Innovation 页 ── */
.overview { background: var(--white); }
.overview .section-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.overview-image {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--bg-light) 100%);
    border-radius: var(--radius); aspect-ratio: 4/3;
    display: flex; align-items: center; justify-content: center;
    color: var(--primary); font-size: 18px; font-weight: 600; letter-spacing: 1px; text-align: center;
}
.dimensions { background: var(--bg-light); }
.dim-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 48px; }
.dim-card {
    background: var(--white); border-radius: var(--radius); padding: 36px 24px;
    text-align: center; border: 1px solid var(--border); transition: all .3s;
}
.dim-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }
.dim-icon {
    width: 56px; height: 56px; margin: 0 auto 20px;
    display: flex; align-items: center; justify-content: center;
    background: var(--primary-light);
    border-radius: 12px;
    color: var(--primary);
    font-size: 28px;
}
.dim-icon svg { width: 28px; height: 28px; }
.dim-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.dim-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.tech { background: var(--white); }
.tech-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.tech-tag {
    padding: 12px 24px; background: var(--primary-light); color: var(--primary);
    border-radius: 6px; font-size: 15px; font-weight: 600; border: 1px solid var(--border);
}
.lab { background: var(--bg-lighter); }
.lab-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 48px; }
.lab-card { background: var(--white); border-radius: var(--radius); padding: 32px 24px; border: 1px solid var(--border); }
.lab-card h4 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.lab-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* ── 通用详情页 / 画廊 ── */
.content-body { font-size: 17px; line-height: 1.8; color: var(--text-secondary); margin-bottom: 64px; }
.gallery-grid { display: flex; flex-wrap: wrap; gap: 24px 16px; }
.gallery-item { margin: 0; padding: 0; flex-shrink: 0; }
.gallery-item img { height: 400px; width: auto; display: block; transition: transform .3s; border-radius: var(--radius); }
.gallery-item img:hover { transform: scale(1.03); }

/* ── 首页 Hero 按钮微调 ── */
.hero .btn-primary { background: #fff; color: var(--primary-dark); }
.hero .btn-primary:hover { background: var(--primary-light); }

/* ── 响应式 ── */
@media (max-width: 1024px) {
    .card-grid--3 { grid-template-columns: repeat(2, 1fr); }
    .card-grid--4 { grid-template-columns: repeat(2, 1fr); }
    .card-grid { grid-template-columns: repeat(2, 1fr); }
    .stats__grid { grid-template-columns: repeat(2, 1fr); }
    .overview .section-inner { grid-template-columns: 1fr; gap: 40px; }
    .overview-image { order: -1; }
    .dim-grid { grid-template-columns: 1fr 1fr; }
    .lab-grid { grid-template-columns: 1fr 1fr; }
    .grid-2 { grid-template-columns: 1fr; gap: 40px; }
    .grid-2 > div:last-child { order: -1; }
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    :root { --header-height: 64px; }
    .about-overview__header { flex-direction: column; gap: 16px; align-items: flex-start; }
    .about-overview__logo img { width: 64px; height: 64px; }
    .about-overview__en { font-size: 12px; letter-spacing: 1px; }
    .header-inner { padding: 0 16px; }
    .header { height: 64px; }
    .nav {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px 20px;
        gap: 0;
        overflow-y: auto;
        display: none;
        z-index: 9999;
        box-shadow: 0 8px 32px rgba(0,0,0,.12);
        -webkit-overflow-scrolling: touch;
        /* 强制创建独立层叠上下文，避免被 header 的层叠上下文限制 */
        will-change: transform;
        transform: translateZ(0);
        /* 明确高度，避免某些浏览器对 top+bottom 的处理异常 */
        height: calc(100vh - 64px);
        max-height: calc(100vh - 64px);
    }
    .nav.open {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
        animation: menuSlideIn .25s ease-out;
    }
    .nav.open ~ .mobile-overlay { display: block; }
    @keyframes menuSlideIn {
        from { opacity: 0; }
        to { opacity: 1; }
    }
    .nav > a {
        display: flex;
        align-items: center;
        min-height: 52px;
        padding: 12px 0;
        font-size: 17px;
        font-weight: 500;
        color: var(--text);
        border-bottom: 1px solid var(--border);
        width: 100%;
    }
    .nav > a:hover,
    .nav > a.active {
        color: var(--primary);
        background: none;
    }
    .nav > a::after { display: none; }
    .nav .lang-switch {
        display: flex;
        width: 100%;
        margin: 16px 0 0;
        padding: 16px 0 0;
        border-left: none;
        border-top: 1px solid var(--border);
        gap: 12px;
        justify-content: flex-start;
    }
    .nav .lang-switch a {
        min-width: 48px;
        text-align: center;
        padding: 8px 16px;
        border-radius: 8px;
        background: var(--bg-light);
        font-size: 15px;
    }
    .nav .lang-switch a.active {
        background: var(--primary);
        color: #fff;
    }
    .nav .gt-switch {
        width: 100%;
        margin: 12px 0 0;
    }
    .nav .gt-switch select {
        width: 100%;
        padding: 12px 16px;
        font-size: 16px;
        border-radius: 8px;
    }
    .nav .member-menu {
        display: flex;
        flex-direction: column;
        width: 100%;
        gap: 8px;
        margin-top: 16px;
        padding-top: 16px;
        border-top: 1px solid var(--border);
    }
    .nav .member-menu a,
    .nav .member-menu button {
        width: 100%;
        min-height: 48px;
        padding: 12px 16px;
        border-radius: 8px;
        font-size: 16px;
        text-align: center;
    }
    .nav .member-menu a {
        background: var(--primary-light);
        color: var(--primary);
        text-decoration: none;
    }
    .nav .member-menu button {
        background: transparent;
        border: 1px solid var(--border);
        color: var(--text-secondary);
        cursor: pointer;
    }
    .mobile-toggle { display: block; width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; }
    .logo-brand { font-size: 14px; }
    .logo-sub-en { font-size: 8px; letter-spacing: 0.1px; }
    .logo-brand-en { font-size: 11px; }
    .logo-img { height: 32px; max-width: 120px; }
    section { padding: 56px 16px; }
    .page-banner { padding: 48px 16px; }
    .container { padding: 0 16px; }
    .card-grid--3, .card-grid--2, .card-grid--4, .card-grid { grid-template-columns: 1fr; }
    .stats__grid { grid-template-columns: 1fr; }
    .dim-grid, .lab-grid { grid-template-columns: 1fr; }
    .footer-links-inner { grid-template-columns: 1fr; padding: 32px 16px; gap: 24px; }
    .footer-col { padding-bottom: 20px; border-bottom: 1px solid var(--border); }
    .footer-col:last-child { border-bottom: none; padding-bottom: 0; }
    .footer-col h5 { font-size: 16px; margin-bottom: 12px; }
    .footer-col p { font-size: 15px; }
    .footer-contact-link {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 12px 16px;
        margin: 8px 0;
        background: var(--bg-light);
        border-radius: 10px;
        text-decoration: none;
        color: var(--text);
        font-size: 15px;
        min-height: 48px;
        transition: background .2s;
    }
    .footer-contact-link:active { background: var(--primary-light); }
    .footer-contact-link svg { flex-shrink: 0; }
    .footer-contact-icon {
        width: 40px; height: 40px;
        display: flex; align-items: center; justify-content: center;
        background: var(--primary-light); border-radius: 10px;
        flex-shrink: 0;
    }
    .footer-main-inner { flex-direction: column; text-align: center; gap: 16px; padding: 24px 16px; }
    .footer-legal { justify-content: center; gap: 16px; }
    .footer-copy { font-size: 12px; }
    .grid-3 { grid-template-columns: 1fr; }
    .gallery-grid { grid-template-columns: 1fr; }
    .hero { min-height: 70vh; }
    .hero .btn { width: 100%; justify-content: center; }
    .hero-content { padding: 0 20px; }
    .hero-title { font-size: 28px !important; }
    .hero-desc { font-size: 15px; }
    .hero-actions { flex-direction: column; gap: 12px; }
    .section-inner { padding: 0 16px; }
    .section-heading { font-size: 24px; }
    .section-desc { font-size: 15px; }
    /* 触摸目标优化 */
    .btn, .btn-text, a, button { min-height: 44px; }
    .btn:active { transform: scale(0.97); }
}