/* ==========================================================
   陆迪盛华 LandSub 官网设计系统
   依据 LandSub Brand Guidelines 2020 调色板：
   主色 Tart Orange #FF3D3A / Jet #2C2C2D / Black / White
   辅色 Independence #48435C / Isabelline #F5EFED /
        Morning Blue #94A89A / Cadet Grey #93A3B1
   字体：Red Hat Text（英） + Noto Sans SC（中）
   ========================================================== */
:root {
  /* 品牌色 */
  --brand: #FF3D3A;            /* Tart Orange 主色 */
  --brand-deep: #D00042;       /* 品牌渐变终点 */
  --jet: #2C2C2D;              /* Jet 深色 */
  --independence: #48435C;     /* Independence 深紫蓝 */
  --isabelline: #F5EFED;       /* Isabelline 浅米白 */
  --morning: #94A89A;          /* Morning Blue */
  --cadet: #93A3B1;            /* Cadet Grey */
  /* 功能映射 */
  --ink-900: #2C2C2D;
  --ink-600: #55565C;
  --ink-400: #8B8C93;
  --bg-light: var(--isabelline);
  --bg-white: #FFFFFF;
  --line: #E7E0DE;
  --radius: 12px;
  --shadow-sm: 0 2px 10px rgba(44, 44, 45, .06);
  --shadow-md: 0 10px 30px rgba(44, 44, 45, .10);
  --shadow-lg: 0 20px 50px rgba(44, 44, 45, .16);
  --maxw: 1200px;
  --font: "Red Hat Text", "Noto Sans", "Noto Naskh Arabic", "Noto Kufi Arabic", sans-serif;
  --font-ar: "Noto Naskh Arabic", "Noto Kufi Arabic", "Noto Sans", sans-serif;
}

/* 阿拉伯文（RTL）字体覆盖 */
[lang="ar"] body { font-family: var(--font-ar); }
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: var(--font); color: var(--ink-900); line-height: 1.7; background: var(--bg-white); font-size: 16px; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 通用排版 ---------- */
h1, h2, h3, h4 { line-height: 1.35; font-weight: 700; color: var(--ink-900); }
.section { padding: 88px 0; }
.section--dark { background: linear-gradient(160deg, #1E1E1F, var(--jet) 55%, var(--independence)); color: #EDE9E7; }
.section--dark h2, .section--dark h3 { color: #fff; }
.section--gray { background: var(--bg-light); }
.sec-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
.sec-tag { display: inline-block; font-size: 13px; letter-spacing: .2em; color: var(--brand); font-weight: 600; text-transform: uppercase; margin-bottom: 12px; }
.sec-tag::before, .sec-tag::after { content: ""; display: inline-block; width: 26px; height: 1px; background: var(--brand); vertical-align: middle; margin: 0 10px; }
.sec-title { font-size: clamp(26px, 3.4vw, 38px); }
.sec-desc { margin-top: 14px; color: var(--ink-600); font-size: 16px; }
.section--dark .sec-desc { color: #B9B3C6; }

/* ---------- 按钮 ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 30px; border-radius: 6px; font-weight: 600; font-size: 15px; transition: all .25s ease; cursor: pointer; border: 1px solid transparent; }
.btn--primary { background: linear-gradient(90deg, var(--brand), var(--brand-deep)); color: #fff; }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(255, 61, 58, .38); }
.btn--ghost { border-color: rgba(255, 255, 255, .4); color: #fff; }
.btn--ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn--outline { border-color: var(--brand); color: var(--brand); }
.btn--outline:hover { background: var(--brand); color: #fff; }
.btn--sm { padding: 9px 20px; font-size: 14px; }

/* ---------- 顶部导航 ---------- */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 100; background: rgba(30, 30, 31, .94); backdrop-filter: blur(10px); border-bottom: 1px solid rgba(255, 255, 255, .06); }
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; }
.logo img { height: 30px; width: auto; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav > li { position: relative; }
.main-nav > li > a { display: block; padding: 24px 13px; color: #D8D4D2; font-size: 15px; transition: color .2s; }
.main-nav > li > a:hover, .main-nav > li > a.active { color: var(--brand); }
.has-sub > a::after { content: ""; display: inline-block; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); margin-left: 7px; }
.sub-nav { position: absolute; top: 100%; left: 50%; transform: translate(-50%, 8px); min-width: 560px; background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-lg); padding: 22px 26px; opacity: 0; visibility: hidden; transition: all .22s ease; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 30px; }
.has-sub:hover .sub-nav { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.sub-group-title { grid-column: span 1; font-size: 12px; letter-spacing: .12em; color: var(--ink-400); padding: 6px 12px 8px; border-bottom: 1px solid var(--line); margin-bottom: 4px; }
.sub-nav a { display: block; padding: 9px 12px; border-radius: 8px; font-size: 14px; color: var(--ink-900); transition: background .2s; }
.sub-nav a:hover { background: var(--bg-light); color: var(--brand); }
.sub-nav a small { display: block; color: var(--ink-400); font-size: 12px; }
.nav-cta { margin-left: 14px; }
.nav-toggle { display: none; background: none; border: 0; width: 44px; height: 44px; cursor: pointer; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px auto; transition: .3s; }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100svh; display: flex; align-items: center; background: radial-gradient(1100px 520px at 78% 18%, rgba(255, 61, 58, .15), transparent 60%), radial-gradient(800px 400px at 12% 85%, rgba(208, 0, 66, .10), transparent 60%), linear-gradient(165deg, #1E1E1F 0%, var(--jet) 52%, var(--independence) 100%); color: #fff; overflow: hidden; padding: 140px 0 90px; }
.hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255, 61, 58, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 61, 58, .05) 1px, transparent 1px); background-size: 56px 56px; mask-image: radial-gradient(ellipse 90% 80% at 50% 40%, #000 30%, transparent 75%); }
.fiber-lines { position: absolute; inset: 0; pointer-events: none; }
.fiber-lines i { position: absolute; height: 1px; width: 42%; background: linear-gradient(90deg, transparent, rgba(255, 61, 58, .8), transparent); animation: fiber 5.5s linear infinite; }
.fiber-lines i:nth-child(1) { top: 24%; animation-delay: 0s; }
.fiber-lines i:nth-child(2) { top: 47%; animation-delay: 1.8s; width: 55%; }
.fiber-lines i:nth-child(3) { top: 71%; animation-delay: 3.4s; }
@keyframes fiber { 0% { left: -45%; opacity: 0; } 12% { opacity: 1; } 88% { opacity: 1; } 100% { left: 105%; opacity: 0; } }
.hero-inner { position: relative; max-width: 880px; }
.hero-eyebrow { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; color: var(--brand); letter-spacing: .14em; border: 1px solid rgba(255, 61, 58, .35); padding: 7px 16px; border-radius: 999px; margin-bottom: 26px; background: rgba(255, 61, 58, .07); }
.hero h1 { color: #fff; font-size: clamp(34px, 5.4vw, 58px); letter-spacing: .01em; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, var(--brand), #FF7A6E); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { margin-top: 22px; font-size: clamp(15px, 1.6vw, 18px); color: #C4BECB; max-width: 640px; }
.hero-actions { margin-top: 38px; display: flex; gap: 16px; flex-wrap: wrap; }
.hero-meta { margin-top: 56px; display: flex; gap: 40px; flex-wrap: wrap; color: #9B93A8; font-size: 13px; }
.hero-meta b { color: #fff; }

/* ---------- 数据看板 ---------- */
.stats-band { background: #1E1E1F; border-top: 1px solid rgba(255, 61, 58, .16); }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat { padding: 44px 20px; text-align: center; border-left: 1px solid rgba(255, 255, 255, .06); }
.stat:first-child { border-left: 0; }
.stat-num { font-size: clamp(30px, 3.6vw, 44px); font-weight: 800; color: var(--brand); font-variant-numeric: tabular-nums; }
.stat-num small { font-size: .45em; font-weight: 600; margin-left: 2px; }
.stat-label { margin-top: 6px; color: #A79FAE; font-size: 14px; }
.stat-note { color: #6E6878; font-size: 12px; margin-top: 2px; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 24px; }
.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(--line); border-radius: var(--radius); padding: 30px; transition: all .28s ease; position: relative; overflow: hidden; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: rgba(255, 61, 58, .45); }
.card-icon { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; background: linear-gradient(135deg, rgba(255, 61, 58, .10), rgba(72, 67, 92, .06)); margin-bottom: 18px; font-size: 24px; }
.card-icon img { width: 34px; height: 34px; }
.card-icon--emoji { font-size: 24px; }
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--ink-600); font-size: 14.5px; }
.card-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; color: var(--brand); font-weight: 600; font-size: 14px; }
.card-link:hover { gap: 10px; }
.card-link::after { content: "→"; transition: inherit; }

/* 业务线大卡 */
.biz-card { border-radius: 16px; padding: 42px 38px; color: #fff; position: relative; overflow: hidden; min-height: 320px; display: flex; flex-direction: column; }
.biz-card--a { background: linear-gradient(150deg, var(--jet), var(--independence)); }
.biz-card--b { background: linear-gradient(150deg, #3A1F26, #7A1E33); }
.biz-card::after { content: ""; position: absolute; right: -60px; bottom: -60px; width: 220px; height: 220px; border-radius: 50%; background: radial-gradient(circle, rgba(255, 61, 58, .25), transparent 70%); }
.biz-tag { font-size: 12px; letter-spacing: .2em; color: var(--brand); margin-bottom: 14px; }
.biz-card h3 { color: #fff; font-size: 24px; margin-bottom: 12px; }
.biz-card p { color: #CFC8D6; font-size: 14.5px; flex: 1; }
.biz-list { margin: 18px 0 22px; }
.biz-list li { padding: 7px 0; border-bottom: 1px dashed rgba(255, 255, 255, .16); color: #E8E2E6; font-size: 14px; }
.biz-list li::before { content: "◆"; color: var(--brand); font-size: 9px; margin-right: 10px; vertical-align: 2px; }

/* 产品卡 */
.product-card { display: flex; flex-direction: column; }
.product-card .p-line { font-size: 12px; color: var(--brand-deep); font-weight: 600; letter-spacing: .08em; margin-bottom: 8px; }
.product-card h3 { font-size: 18px; }
.product-card .p-model { color: var(--ink-400); font-size: 12.5px; margin-bottom: 10px; }
.spec-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 6px; }
.spec-chips span { font-size: 12px; background: var(--bg-light); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; color: var(--ink-600); }
.product-card .card-link { margin-top: auto; padding-top: 16px; }

/* 行业方案卡 */
.ind-card { text-align: left; }
.ind-card .ind-en { font-size: 11px; letter-spacing: .16em; color: var(--ink-400); text-transform: uppercase; }

/* ---------- 参数对比表 ---------- */
.compare-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); font-size: 14.5px; }
.compare-table caption { text-align: left; font-weight: 700; font-size: 16px; padding: 0 0 14px; color: var(--ink-900); }
.compare-table th, .compare-table td { padding: 13px 18px; border-bottom: 1px solid var(--line); text-align: left; }
.compare-table thead th { background: var(--jet); color: #fff; font-size: 14px; }
.compare-table thead th.ours { background: linear-gradient(90deg, var(--brand), var(--brand-deep)); }
.compare-table td.ours { color: var(--brand-deep); font-weight: 700; background: rgba(255, 61, 58, .05); }
.compare-table tbody tr:last-child td { border-bottom: 0; }

/* ---------- 案例 ---------- */
.case-card { display: flex; flex-direction: column; }
.case-badges { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.badge { font-size: 11.5px; padding: 3px 10px; border-radius: 4px; font-weight: 600; }
.badge--cyan { background: rgba(148, 168, 154, .18); color: #5F7A66; }
.badge--gold { background: rgba(255, 61, 58, .10); color: var(--brand-deep); }
.badge--navy { background: rgba(72, 67, 92, .10); color: var(--independence); }
.case-metric { margin-top: auto; padding-top: 18px; }
.case-metric .num { font-size: 30px; font-weight: 800; color: var(--brand); }
.case-metric .num small { font-size: .5em; }
.case-metric .lbl { font-size: 13px; color: var(--ink-400); }

/* ---------- 时间轴 ---------- */
.timeline { position: relative; max-width: 760px; margin: 0 auto; padding-left: 34px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--brand), var(--independence)); }
.timeline li { position: relative; padding: 0 0 34px 22px; }
.timeline li::before { content: ""; position: absolute; left: -32px; top: 7px; width: 12px; height: 12px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 0 5px rgba(255, 61, 58, .15); }
.timeline .t-year { font-weight: 800; color: var(--brand); font-size: 17px; }
.timeline .t-body { color: var(--ink-600); font-size: 14.5px; margin-top: 4px; }

/* ---------- 团队 ---------- */
.team-card { text-align: center; }
.team-avatar { width: 84px; height: 84px; border-radius: 50%; margin: 0 auto 16px; display: grid; place-items: center; font-size: 26px; font-weight: 700; color: #fff; background: linear-gradient(135deg, var(--independence), var(--brand-deep)); }
.team-card h3 { font-size: 18px; }
.team-role { color: var(--brand); font-size: 13px; font-weight: 600; margin: 4px 0 10px; }
.team-card p { font-size: 13.5px; color: var(--ink-600); }

/* ---------- 名录墙 ---------- */
.logo-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.logo-wall li { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 18px 10px; text-align: center; font-weight: 600; color: var(--ink-600); font-size: 14.5px; transition: all .25s; }
.logo-wall li:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-3px); }
.section--dark .logo-wall li { background: rgba(255, 255, 255, .05); border-color: rgba(255, 255, 255, .1); color: #D8D2DA; }

/* ---------- 新闻 ---------- */
.news-item { display: flex; gap: 26px; padding: 26px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.news-date { flex-shrink: 0; width: 110px; color: var(--brand); font-weight: 700; font-variant-numeric: tabular-nums; }
.news-date small { display: block; color: var(--ink-400); font-weight: 400; font-size: 12px; }
.news-item h3 { font-size: 17px; transition: color .2s; }
.news-item:hover h3 { color: var(--brand); }
.news-item p { color: var(--ink-600); font-size: 14px; margin-top: 6px; }
.news-cat { font-size: 12px; color: var(--brand-deep); font-weight: 600; margin-right: 8px; }

/* ---------- FAQ ---------- */
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; }
.faq-q { width: 100%; text-align: left; background: none; border: 0; padding: 20px 24px; font-size: 16px; font-weight: 600; color: var(--ink-900); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; font-family: var(--font); }
.faq-q::after { content: "+"; font-size: 22px; color: var(--brand); transition: transform .25s; flex-shrink: 0; }
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a-inner { padding: 0 24px 22px; color: var(--ink-600); font-size: 14.5px; }

/* ---------- CTA 横幅 ---------- */
.cta-band { background: linear-gradient(120deg, var(--jet), var(--independence) 55%, var(--brand-deep)); border-radius: 18px; padding: 56px 48px; color: #fff; display: flex; align-items: center; justify-content: space-between; gap: 30px; flex-wrap: wrap; position: relative; overflow: hidden; }
.cta-band::after { content: ""; position: absolute; right: -40px; top: -40px; width: 200px; height: 200px; border-radius: 50%; background: radial-gradient(circle, rgba(255, 61, 58, .32), transparent 70%); }
.cta-band h2 { color: #fff; font-size: clamp(22px, 2.6vw, 30px); }
.cta-band p { color: #CFC8D6; margin-top: 8px; }

/* ---------- 页面头（内页） ---------- */
.page-hero { background: linear-gradient(155deg, #1E1E1F, var(--jet) 60%, var(--independence)); color: #fff; padding: 150px 0 72px; position: relative; overflow: hidden; }
.page-hero::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255, 61, 58, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 61, 58, .05) 1px, transparent 1px); background-size: 56px 56px; mask-image: radial-gradient(ellipse 80% 90% at 50% 100%, #000 20%, transparent 75%); }
.page-hero h1 { color: #fff; font-size: clamp(28px, 4vw, 42px); position: relative; }
.page-hero .lead { color: #C4BECB; margin-top: 14px; max-width: 720px; position: relative; }
.breadcrumb { font-size: 13px; color: #9B93A8; margin-bottom: 18px; position: relative; }
.breadcrumb a:hover { color: var(--brand); }
.breadcrumb span::before { content: "/"; margin: 0 8px; color: #5A5464; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px; }
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow-sm); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { margin-bottom: 18px; }
.form-field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 7px; }
.form-field label i { color: var(--brand); font-style: normal; }
.form-field input, .form-field textarea, .form-field select { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; font-size: 14.5px; font-family: var(--font); transition: border-color .2s; background: #FDFBFA; }
.form-field input:focus, .form-field textarea:focus, .form-field select:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(255, 61, 58, .12); }
.contact-info li { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px dashed var(--line); }
.contact-info .ci-icon { width: 44px; height: 44px; flex-shrink: 0; border-radius: 10px; background: var(--bg-light); display: grid; place-items: center; color: var(--brand); font-size: 19px; }
.contact-info b { display: block; font-size: 15px; }
.contact-info span { color: var(--ink-600); font-size: 14px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #1E1E1F; color: #9B93A8; padding: 64px 0 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a:hover { color: var(--brand); }
.footer-brand p { margin-top: 14px; max-width: 300px; line-height: 1.8; }
.footer-brand img { height: 28px; width: auto; }
.footer-slogan { color: var(--brand); font-weight: 700; letter-spacing: .12em; margin-top: 16px; font-size: 15px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .08); padding: 20px 0; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; color: #6E6878; }

/* ---------- 动效 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .fiber-lines { display: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(3) { border-left: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sub-nav { min-width: 480px; }
}
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .nav-toggle { display: block; }
  .main-nav { position: fixed; inset: 72px 0 auto 0; background: #1E1E1F; flex-direction: column; align-items: stretch; padding: 12px 20px 28px; gap: 0; max-height: calc(100svh - 72px); overflow-y: auto; transform: translateY(-12px); opacity: 0; visibility: hidden; transition: all .25s; border-bottom: 1px solid rgba(255,255,255,.1); }
  body.nav-open .main-nav { transform: none; opacity: 1; visibility: visible; }
  body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .main-nav > li > a { padding: 14px 6px; border-bottom: 1px solid rgba(255,255,255,.07); }
  .sub-nav { position: static; transform: none; opacity: 1; visibility: visible; min-width: 0; background: rgba(255,255,255,.04); box-shadow: none; grid-template-columns: 1fr; padding: 8px 6px; display: none; }
  .has-sub.open .sub-nav { display: grid; }
  .sub-nav a { color: #D8D4D2; }
  .sub-nav a small { color: #9B93A8; }
  .sub-group-title { color: #9B93A8; border-color: rgba(255,255,255,.1); }
  .nav-cta { margin: 14px 0 0; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 28px 12px; border-left: 0; }
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
  .news-item { flex-direction: column; gap: 6px; }
  .news-date { width: auto; }
  .cta-band { padding: 40px 28px; }
  .compare-table { display: block; overflow-x: auto; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-meta { gap: 22px; }
}

/* 主导航语义化包裹（不影响既有布局） */
nav[aria-label="主导航"] { display: contents; }

/* 产品卡片图统一比例（4:3 白底 contain，保证 6 卡标题对齐） */
.product-card > img { aspect-ratio: 4 / 3; height: auto; object-fit: contain; background: #fff; }

/* 案例卡标题行高统一（一行/两行标题的卡片正文对齐） */
.case-card h3 { min-height: 2.6em; line-height: 1.3; }

/* ==========================================================
   国际版新增：语言切换器
   ========================================================== */
.lang-switch { position: relative; margin-left: 16px; }
.lang-switch .lang-current { display: inline-flex; align-items: center; gap: 7px; padding: 8px 14px; border: 1px solid rgba(255, 255, 255, .22); border-radius: 999px; color: #D8D4D2; font-size: 14px; cursor: pointer; background: none; font-family: var(--font); transition: all .2s; }
.lang-switch .lang-current:hover { border-color: var(--brand); color: #fff; }
.lang-switch .lang-current::after { content: ""; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translateY(-2px); }
.lang-menu { position: absolute; top: calc(100% + 8px); right: 0; background: #fff; border-radius: 10px; box-shadow: var(--shadow-lg); padding: 6px; min-width: 160px; opacity: 0; visibility: hidden; transform: translateY(6px); transition: all .2s; }
.lang-switch:hover .lang-menu, .lang-switch:focus-within .lang-menu { opacity: 1; visibility: visible; transform: none; }
.lang-menu a { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 14px; border-radius: 7px; color: var(--ink-900); font-size: 14px; }
.lang-menu a:hover { background: var(--bg-light); color: var(--brand); }
.lang-menu a.current { color: var(--brand); font-weight: 600; }
.lang-menu a small { color: var(--ink-400); font-size: 12px; }

/* ==========================================================
   国际版新增：RTL 支持（阿拉伯文）
   ========================================================== */
[dir="rtl"] body { direction: rtl; }
[dir="rtl"] .lang-switch { margin-left: 0; margin-right: 16px; }
[dir="rtl"] .lang-menu { right: auto; left: 0; }
[dir="rtl"] .lang-switch .lang-current::after { transform: rotate(45deg) translateY(-2px) scaleX(-1); }
[dir="rtl"] .sec-head, [dir="rtl"] .sec-desc, [dir="rtl"] .card, [dir="rtl"] .footer-brand p { text-align: right; }
[dir="rtl"] .card-link::after { content: "←"; }
[dir="rtl"] .has-sub > a::after { margin-left: 0; margin-right: 7px; }
[dir="rtl"] .biz-list li::before { margin-right: 0; margin-left: 10px; }
[dir="rtl"] .news-item { flex-direction: row-reverse; }
[dir="rtl"] .news-date { text-align: right; }
[dir="rtl"] .hero-inner { text-align: right; }
[dir="rtl"] .contact-info li { flex-direction: row-reverse; }
[dir="rtl"] .faq-q { text-align: right; }
[dir="rtl"] .timeline { padding-left: 0; padding-right: 34px; }
[dir="rtl"] .timeline::before { left: auto; right: 8px; }
[dir="rtl"] .timeline li { padding: 0 22px 34px 0; }
[dir="rtl"] .timeline li::before { left: auto; right: -32px; }
[dir="rtl"] .compare-table th, [dir="rtl"] .compare-table td { text-align: right; }
[dir="rtl"] .form-field label { text-align: right; }
[dir="rtl"] .breadcrumb { direction: rtl; }

/* ==========================================================
   博客文章排版（Resources / Blog）
   ========================================================== */
.article-body { max-width: 760px; margin: 0 auto; font-size: 16.5px; line-height: 1.85; color: var(--ink-900); }
.article-body .article-lead { font-size: 18px; color: var(--ink-600); border-left: 3px solid var(--brand); padding-left: 18px; margin-bottom: 34px; font-weight: 500; }
.article-meta { color: #9B93A8; font-size: 14px; }
.article-meta .news-cat { color: var(--brand-deep); }
.article-body h2 { font-size: 25px; margin: 44px 0 16px; padding-top: 8px; }
.article-body h3 { font-size: 20px; margin: 30px 0 12px; }
.article-body p { margin: 0 0 18px; }
.article-body strong { color: var(--ink-900); }
.article-body blockquote { margin: 22px 0; padding: 16px 22px; background: var(--bg-light); border-left: 3px solid var(--brand); color: var(--ink-600); font-size: 16px; border-radius: 0 10px 10px 0; }
.article-body ul { margin: 0 0 18px; padding-left: 22px; list-style: disc; }
.article-body li { margin: 8px 0; color: var(--ink-600); }
.article-body li strong { color: var(--ink-900); }
.table-wrap { overflow-x: auto; margin: 24px 0; border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.article-body table { width: 100%; border-collapse: collapse; background: #fff; font-size: 14.5px; min-width: 480px; }
.article-body thead th { background: var(--jet); color: #fff; padding: 12px 16px; text-align: left; font-weight: 600; font-size: 14px; }
.article-body tbody td { padding: 12px 16px; border-bottom: 1px solid var(--line); color: var(--ink-600); }
.article-body tbody tr:last-child td { border-bottom: 0; }
.article-body em { color: var(--ink-900); }
@media (max-width: 768px) {
  .article-body { font-size: 15.5px; }
  .article-body h2 { font-size: 21px; }
}

/* ==========================================================
   面向 AI 的静态 FAQ 页（answer-first，全量展开，不用手风琴）
   ========================================================== */
.faq-q-static { font-size: 17px; font-weight: 700; color: var(--ink-900); margin: 22px 0 8px; line-height: 1.4; }
.faq-q-static::before { content: "Q. "; color: var(--brand); }
.faq-a-static { color: var(--ink-600); font-size: 15.5px; line-height: 1.8; padding-bottom: 8px; border-bottom: 1px dashed var(--line); }
.faq-a-static p { margin: 0; }