/* ===== HD 立搏汉鼎 官网设计系统 =====
   基于 Ardot 设计稿 1:1 还原 — Apple 风 / Action Blue */
:root{
  --blue:#0066cc; --blue-hover:#0071e3; --blue-on-dark:#2997ff;
  --ink:#1d1d1f; --ink-mut:#6e6e73; --ink-soft:#86868b;
  --canvas:#ffffff; --parchment:#f5f5f7; --pearl:#fafafc;
  --tile-dark:#272729; --tile-dark2:#2a2a2c; --hairline:#e0e0e0;
  --nav-bg:#000000;
  --card-bg:#ffffff; --text-1:#1d1d1f; --text-2:#6e6e73;
  --radius-s:8px; --radius-m:12px; --radius-l:18px; --radius-xl:24px; --radius-pill:9999px;
  --shadow-product:0 24px 60px -18px rgba(0,0,0,.28);
  --shadow-card:0 4px 24px rgba(0,0,0,.06);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
[data-theme="dark"]{
  --canvas:#000000; --parchment:#161617; --pearl:#1d1d1f;
  --card-bg:#1d1d1f; --text-1:#f5f5f7; --text-2:#a1a1a6;
  --hairline:#3a3a3c;
  --shadow-card:0 4px 24px rgba(0,0,0,.5);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--canvas);color:var(--text-1);-webkit-font-smoothing:antialiased;transition:background .4s ease,color .4s ease}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
[dir="rtl"]{direction:rtl}
.container{max-width:1280px;margin:0 auto;padding:0 40px}
/* ---------- 全局导航 ---------- */
.nav{position:sticky;top:0;z-index:100;background:var(--nav-bg);height:56px;display:flex;align-items:center}
.nav-inner{width:100%;max-width:1440px;margin:0 auto;padding:0 40px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo img{height:26px;width:auto}
.nav-logo span{color:#fff;font-size:16px;font-weight:600;letter-spacing:.02em}
.mobile-menu-btn{display:none;background:none;border:0;color:#fff;font-size:22px;cursor:pointer}
.nav-links{display:flex;gap:36px;list-style:none}
.nav-links a{color:#ccc;font-size:14px;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-tools{display:flex;align-items:center;gap:16px}
.nav-tools button{background:none;border:none;cursor:pointer;color:#fff;display:flex;align-items:center;gap:6px;font-size:12px;font-family:var(--font)}
.nav-tools svg{width:17px;height:17px;stroke:#fff}
/* 语言面板 */
.lang-wrap{position:relative}
.lang-panel{position:absolute;top:34px;right:0;width:210px;background:#1d1d1f;border-radius:14px;padding:12px 0;box-shadow:0 16px 44px rgba(0,0,0,.45);display:none;z-index:120}
.lang-panel.open{display:block}
.lang-panel .lang-title{font-size:11px;color:#999;padding:0 18px 8px;font-weight:600;letter-spacing:.02em}
.lang-panel button{display:block;width:100%;text-align:left;background:none;border:none;color:#fff;font-size:13.5px;padding:8px 18px;cursor:pointer;font-family:var(--font)}
.lang-panel button:hover{background:rgba(255,255,255,.08)}
.lang-panel button.on{color:var(--blue-on-dark)}
[dir="rtl"] .lang-panel{right:auto;left:0}
[dir="rtl"] .lang-panel button{text-align:right}
/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--font);font-size:16px;font-weight:500;padding:13px 28px;border-radius:var(--radius-pill);cursor:pointer;border:none;transition:transform .15s ease,background .2s;white-space:nowrap}
.btn:active{transform:scale(.95)}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-hover)}
.btn-ghost{background:transparent;color:var(--blue);border:1.5px solid var(--blue)}
[data-theme="dark"] .btn-ghost{color:var(--blue-on-dark);border-color:var(--blue-on-dark)}
/* ---------- Hero ---------- */
.hero{position:relative;height:min(88vh,760px);min-height:560px;display:flex;align-items:flex-end;overflow:hidden;background:#000}
.hero video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.25) 0%,rgba(0,0,0,.05) 40%,rgba(0,0,0,.72) 100%)}
.hero-content{position:relative;z-index:2;width:100%;padding:0 0 64px}
.hero-badge{display:inline-block;background:rgba(255,255,255,.14);backdrop-filter:blur(12px);color:#fff;font-size:12.5px;font-weight:600;letter-spacing:.04em;padding:9px 18px;border-radius:var(--radius-pill);margin-bottom:22px}
.hero h1{font-size:clamp(34px,4.6vw,60px);line-height:1.08;font-weight:600;letter-spacing:-.02em;color:#fff;max-width:780px}
.hero p{margin-top:18px;font-size:17.5px;line-height:1.65;color:rgba(255,255,255,.82);max-width:640px}
.hero-cta{margin-top:32px;display:flex;gap:16px;flex-wrap:wrap}
.hero-cta .btn-ghost{color:#fff;border-color:rgba(255,255,255,.7)}
/* ---------- 区块通用 ---------- */
.section{padding:96px 0}
.section.alt{background:var(--parchment);transition:background .4s ease}
.section.dark{background:var(--tile-dark);color:#fff}
.section-head{text-align:center;max-width:820px;margin:0 auto 56px}
.section-head h2{font-size:clamp(28px,3.2vw,42px);font-weight:600;letter-spacing:-.01em}
.section-head p{margin-top:14px;font-size:17px;color:var(--text-2);line-height:1.6}
.section.dark .section-head p{color:#ccc}
/* ---------- 数据概览 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat b{display:block;font-size:clamp(34px,3.6vw,46px);font-weight:600;letter-spacing:-.02em}
.stat span{font-size:13.5px;color:var(--text-2)}
/* ---------- 产品磁贴 ---------- */
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.tile{border-radius:var(--radius-xl);padding:40px;display:flex;flex-direction:column;gap:12px;overflow:hidden;background:var(--parchment);transition:background .4s ease}
.tile.dark{background:var(--tile-dark)}
.tile h3{font-size:27px;font-weight:600}
.tile.dark h3{color:#fff}
.tile p{font-size:15px;line-height:1.6;color:var(--text-2)}
.tile.dark p{color:#ccc}
.tile .more{font-size:15px;font-weight:600}
.tile.dark .more{color:var(--blue-on-dark)}
.tile img{margin-top:14px;border-radius:var(--radius-m);width:100%;height:300px;object-fit:cover;background:#fff}
/* ---------- 优势 ---------- */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.why-card{background:var(--tile-dark2);border-radius:var(--radius-l);padding:30px}
.why-card .num{font-size:22px;font-weight:600;color:var(--blue-on-dark)}
.why-card h4{margin:12px 0 10px;font-size:18px;color:#fff;font-weight:600}
.why-card p{font-size:13.5px;line-height:1.65;color:#ccc}
/* ---------- 证言 ---------- */
.quotes{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.quote{background:var(--parchment);border-radius:var(--radius-l);padding:38px;transition:background .4s ease}
.quote p{font-size:16.5px;line-height:1.7}
.quote footer{margin-top:22px;font-size:13px;font-weight:600;color:var(--text-2)}
/* ---------- 新闻卡 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{background:var(--card-bg);border:1px solid var(--hairline);border-radius:var(--radius-l);padding:30px;transition:background .4s ease,border-color .4s ease,transform .2s}
.news-card:hover{transform:translateY(-4px)}
.news-card .meta{font-size:12px;font-weight:600;color:var(--blue);margin-bottom:12px}
.news-card h4{font-size:17px;line-height:1.5;font-weight:600}
.news-card p{margin-top:12px;font-size:13px;line-height:1.6;color:var(--text-2)}
/* ---------- CTA ---------- */
.cta-band{background:var(--tile-dark);text-align:center;padding:88px 40px}
.cta-band h2{font-size:34px;color:#fff;font-weight:600}
.cta-band p{margin:16px auto 30px;color:#ccc;font-size:16.5px;max-width:560px}
/* ---------- 页脚 ---------- */
.footer{background:var(--parchment);padding:64px 0 36px;transition:background .4s ease}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1.1fr;gap:48px}
.footer h5{font-size:14px;font-weight:600;margin-bottom:14px}
.footer ul{list-style:none}
.footer li{margin-bottom:11px}
.footer li a{color:var(--text-2);font-size:13px}
.footer li a:hover{color:var(--blue)}
.footer-brand img{height:96px;width:auto;margin-bottom:14px}
.footer-brand img.logo-dark-only{display:none}
[data-theme="dark"] .footer-brand img.logo-light-only{display:none}
[data-theme="dark"] .footer-brand img.logo-dark-only{display:block}
/* 社交链接 */
.social-row{display:flex;gap:14px;margin-top:18px}
.social-row a{display:inline-flex;width:38px;height:38px;border-radius:50%;overflow:hidden;transition:transform .2s}
.social-row a:hover{transform:translateY(-3px)}
.social-row img{width:100%;height:100%}
.footer-brand .slogan{color:var(--blue);font-size:14px;font-weight:600;margin-bottom:12px}
.footer-brand p{font-size:13px;line-height:1.7;color:var(--text-2)}
.footer-brand .certs{margin-top:14px;font-size:12px;font-weight:600;color:var(--text-2)}
.footer-bottom{margin-top:44px;padding-top:26px;border-top:1px solid var(--hairline);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--text-2)}
/* ---------- 页头（子页） ---------- */
.page-head{background:var(--parchment);padding:64px 0 48px;transition:background .4s ease}
.crumb{font-size:13px;color:var(--text-2);margin-bottom:14px}
.page-head h1{font-size:40px;font-weight:600;letter-spacing:-.01em}
.page-head .sub{margin-top:12px;font-size:17px;color:var(--text-2)}
/* ---------- 产品中心 ---------- */
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.chip{padding:9px 18px;border-radius:var(--radius-pill);font-size:13.5px;border:none;cursor:pointer;background:var(--card-bg);color:var(--text-1);font-family:var(--font);border:1px solid var(--hairline);transition:all .2s}
.chip.on{background:var(--blue);color:#fff;border-color:var(--blue)}
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.prod-card{background:var(--card-bg);border:1px solid var(--hairline);border-radius:var(--radius-l);padding:20px;display:flex;flex-direction:column;gap:10px;transition:transform .2s,box-shadow .2s}
.prod-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-card)}
.prod-card img{width:100%;height:210px;object-fit:cover;border-radius:10px;background:#f5f5f7}
.prod-card .tag{font-size:11px;font-weight:600;color:var(--blue)}
.prod-card h4{font-size:16.5px;font-weight:600}
.prod-card p{font-size:12.5px;line-height:1.55;color:var(--text-2)}
.prod-card .go{margin-top:auto;font-size:13.5px;font-weight:600}
/* ---------- 产品详情 ---------- */
.detail-main{display:grid;grid-template-columns:640px 1fr;gap:56px;padding:56px 0 72px}
.detail-main .main-img{width:100%;height:500px;object-fit:cover;border-radius:var(--radius-l);background:var(--parchment)}
.thumbs{display:flex;gap:16px;margin-top:16px}
.thumbs img{width:calc(50% - 8px);height:150px;object-fit:cover;border-radius:12px;cursor:pointer;background:var(--parchment)}
.p-tag{font-size:13px;font-weight:600;color:var(--blue);margin:14px 0 4px}
.detail-main h1{font-size:40px;font-weight:600;letter-spacing:-.01em}
.p-overview{margin-top:16px;font-size:15px;line-height:1.7;color:var(--text-2)}
.p-cta{margin-top:24px;display:flex;gap:14px;flex-wrap:wrap}
.specs{display:grid;grid-template-columns:1fr 1fr;gap:28px 32px;margin-top:34px}
.spec b{display:block;font-size:22px;font-weight:600}
.spec span{font-size:12px;color:var(--text-2)}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat-card{background:var(--card-bg);border-radius:var(--radius-l);padding:32px;border:1px solid var(--hairline)}
.feat-card h4{font-size:19px;font-weight:600;margin-bottom:12px}
.feat-card p{font-size:13.5px;line-height:1.65;color:var(--text-2)}
table.spec-table{width:min(880px,100%);margin:0 auto;border-collapse:separate;border-spacing:0;border:1px solid var(--hairline);border-radius:14px;overflow:hidden;font-size:14px}
.spec-table td{padding:18px 28px;border-bottom:1px solid var(--hairline)}
.spec-table tr:last-child td{border-bottom:none}
.spec-table tr:nth-child(even){background:var(--parchment)}
.spec-table td:first-child{width:240px;font-weight:600;color:var(--text-2)}
/* ---------- 关于 ---------- */
.about-grid{display:grid;grid-template-columns:1fr 480px;gap:64px;align-items:center}
.about-grid h2{font-size:32px;line-height:1.32;font-weight:600;margin-bottom:20px}
.about-grid p{font-size:15px;line-height:1.8;color:var(--text-2);margin-bottom:16px}
.about-grid .certs{color:var(--blue);font-weight:600;font-size:14px}
.about-grid img{border-radius:var(--radius-l);width:100%;height:440px;object-fit:cover}
.mv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.mv-card{background:var(--tile-dark2);border-radius:var(--radius-l);padding:32px}
.mv-card h4{font-size:19px;color:var(--blue-on-dark);font-weight:600;margin-bottom:12px}
.mv-card p{font-size:14px;line-height:1.7;color:#ccc}
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.tl b{display:block;font-size:26px;color:var(--blue);font-weight:600;margin-bottom:8px}
.tl p{font-size:13px;line-height:1.65;color:var(--text-2)}
/* ---------- 新闻列表 ---------- */
.news-row{display:flex;gap:32px;align-items:flex-start;background:var(--card-bg);border:1px solid var(--hairline);border-radius:16px;padding:28px;margin-bottom:20px;transition:transform .2s}
.news-row:hover{transform:translateY(-3px)}
.news-row .date{width:120px;flex-shrink:0;text-align:center}
.news-row .date b{display:block;font-size:28px;font-weight:600}
.news-row .date span{font-size:12px;color:var(--text-2)}
.news-row .body{flex:1;min-width:0}
.news-row h2{font-size:18px;font-weight:600;margin-bottom:8px;line-height:1.45}
.news-row p{font-size:13px;line-height:1.6;color:var(--text-2)}
.news-row .news-meta{font-size:12px;font-weight:600;color:var(--blue);margin-bottom:8px}
.news-row .go{font-size:14px;font-weight:600;white-space:nowrap;background:none;border:0;color:var(--blue);font-family:var(--font);cursor:pointer;padding:4px 0}
.news-detail{margin-top:18px;padding-top:18px;border-top:1px solid var(--hairline)}
.news-detail p{color:var(--text-1);font-size:14px;line-height:1.8}
.news-status{text-align:center;color:var(--text-2)}
.contact-people{display:grid;grid-template-columns:repeat(2,minmax(130px,1fr));gap:18px}
.contact-person{display:flex;flex-direction:column;align-items:flex-start;gap:6px;padding:16px;border:1px solid var(--hairline);border-radius:14px;background:var(--card-bg)}
.contact-name{font-size:17px;font-weight:700;color:#25d366}
.contact-person>a:not(.contact-name){font-size:13px}
.qr-link{width:112px;margin-top:6px;border-radius:10px;overflow:hidden;background:#fff}
.qr-link img{width:112px;height:112px;object-fit:contain}
.wechat-contact{display:flex;align-items:center;gap:16px;margin-top:18px}
.wechat-contact img{width:132px;height:132px;object-fit:contain;background:#fff;border-radius:12px}
.wechat-contact span{font-size:13px;color:var(--text-2)}
.footer-contact-links{display:flex;flex-direction:column;gap:7px;margin-top:16px}
.footer-contact-links a{font-size:13px;color:var(--text-2)}
.footer-contact-links a:hover{color:#25d366}
.form-note{color:var(--text-2);font-size:13px;line-height:1.6;margin:-10px 0 22px}
.form-status{font-size:14px;line-height:1.5;margin:14px 0 0;min-height:0}
.form-status:empty{margin:0}
.form-status.success{color:#2e9e5b}
.form-status.error{color:#e5484d}
.form-card .btn:disabled{opacity:.6;cursor:not-allowed}
.field label{display:block;font-size:13px;font-weight:600;margin-bottom:7px;color:var(--text-2)}
.footer-lang{padding:0;border:0;background:none;color:var(--text-2);font:inherit;font-size:13px;cursor:pointer}
.social-placeholder{display:inline-flex;width:38px;height:38px;border-radius:50%;overflow:hidden;opacity:.65}
:focus-visible{outline:2px solid var(--blue-on-dark);outline-offset:3px}
.field input:focus-visible,.field textarea:focus-visible{outline:2px solid var(--blue);outline-offset:1px}
/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:420px 1fr;gap:80px;padding:72px 0 96px}
.c-item{margin-bottom:28px}
.c-item b{display:block;font-size:13px;color:var(--blue);font-weight:600;margin-bottom:6px}
.c-item p{font-size:16px;line-height:1.6}
.form-card{background:var(--card-bg);border:1px solid var(--hairline);border-radius:20px;padding:40px}
.form-card h3{font-size:24px;font-weight:600;margin-bottom:22px}
.field{margin-bottom:18px}
.field input,.field textarea{width:100%;font-family:var(--font);font-size:14px;padding:14px 22px;border-radius:var(--radius-pill);border:1px solid var(--hairline);background:var(--canvas);color:var(--text-1);outline:none;transition:border .2s}
.field textarea{border-radius:18px;min-height:130px;resize:vertical}
.field input:focus,.field textarea:focus{border-color:var(--blue)}
/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .prod-grid,.why-grid{grid-template-columns:repeat(2,1fr)}
  .tiles,.quotes,.about-grid,.contact-grid,.detail-main{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr);gap:36px}
  .feat-grid,.news-grid,.mv-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .container{padding:0 22px}
  .mobile-menu-btn{display:block;order:2}
  .nav-inner{padding:0 22px;gap:10px}
  .nav-inner nav{position:absolute;left:0;right:0;top:56px;background:#111;display:none;padding:14px 22px;border-top:1px solid #333}
  .nav-inner nav.open{display:block}
  .nav-links{display:flex;flex-direction:column;gap:0}
  .nav-links li{border-bottom:1px solid #2b2b2b}
  .nav-links a{display:block;padding:14px 0}
  .nav-tools{margin-left:auto;order:3}
  .nav-logo{order:1}
  .nav-logo span{display:none}
  .hero{height:78vh;min-height:480px}
  .section{padding:64px 0}
  .prod-grid,.feat-grid,.news-grid,.mv-grid,.timeline,.why-grid,.stats,.tiles,.quotes{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .specs{grid-template-columns:1fr}
  .news-row{flex-direction:column;align-items:flex-start;gap:14px}
  .contact-people{grid-template-columns:1fr 1fr}
  .qr-link,.qr-link img{width:96px;height:96px}
  .page-head h1{font-size:30px}
}
/* 主题切换平滑 */
body,.section,.tile,.quote,.footer,.page-head,.news-card,.prod-card,.feat-card,.form-card{transition:background .4s ease,color .4s ease,border-color .4s ease}