:root{
    --xh-orange:#e95420;
    --xh-orange-d:#c3410f;
    --xh-aubergine:#2c001e;
    --xh-purple:#77216f;
    --xh-green:#0e8420;
    --xh-green-d:#095c17;
    --xh-blue:#69c;
    --xh-ink:#111;
    --xh-ink-2:#1a1a1a;
    --xh-muted:#b0a8a8;
    --xh-line:#2c2c2c;
    --xh-maxw:1200px;
    --font-en:'Google Sans','Roboto','Segoe UI',-apple-system,sans-serif;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:var(--font-en),"Microsoft YaHei","PingFang SC",sans-serif;color:#e8e8e8;background:#0f0f0f;line-height:1.6;-webkit-font-smoothing:antialiased}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--xh-maxw);margin:0 auto;padding:0 32px}
  .chev{display:inline-block;width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:4px solid currentColor;vertical-align:middle;margin-left:5px;opacity:.8}

  /* ---------- 深色顶部导航（仿 ubuntu.com） ---------- */
  header.nav{position:sticky;top:0;z-index:100;background:#0f0f0f;border-bottom:1px solid #222}
  .nav-inner{display:flex;align-items:center;height:60px;gap:24px}
  .brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:500;font-size:15px;letter-spacing:.3px}
  .brand .cof{width:26px;height:26px;flex:none}
  .brand .cof circle{fill:var(--xh-orange)}
  nav.links{display:flex;align-items:center;gap:4px;margin-left:8px;font-size:14px;color:#e3e3e3}
  nav.links a, nav.links .has-menu{display:flex;align-items:center;gap:5px;padding:8px 12px;border-radius:4px;transition:.15s;cursor:pointer;white-space:nowrap}
  nav.links a:hover, nav.links .has-menu:hover{background:rgba(255,255,255,.1);color:#fff}
  .nav-cta{margin-left:auto;display:flex;align-items:center;gap:14px;color:#e3e3e3;font-size:14px}
  .nav-cta .all-sanhana{display:flex;align-items:center;gap:5px;padding:8px 12px;border-radius:4px;cursor:pointer;transition:.15s}
  .nav-cta .all-sanhana:hover{background:rgba(255,255,255,.1);color:#fff}
  .menu-btn{display:none;background:none;border:0;color:#fff;cursor:pointer}
  .menu-btn svg{width:24px;height:24px}

  /* ---------- Hero（深色、大白标题、绿色 CTA、右侧插图） ---------- */
  .hero{background:#0f0f0f;color:#fff;padding:78px 0 86px;position:relative;overflow:hidden}
  .hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
  .hero-copy{position:relative;z-index:1}
  .hero h1{font-size:clamp(36px,5vw,56px);line-height:1.12;font-weight:700;letter-spacing:-.5px;max-width:16ch}
  .hero h1 span{color:#fff}
  .hero p.lead{margin:20px 0 32px;font-size:18px;color:#bbb;max-width:58ch;line-height:1.6}
  .hero-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
  .btn-green{background:var(--xh-green);color:#fff;padding:12px 24px;border-radius:4px;font-weight:500;font-size:15px;transition:.15s;display:inline-flex;align-items:center;gap:8px}
  .btn-green:hover{background:var(--xh-green-d)}
  .btn-text{color:#fff;font-weight:500;font-size:15px;display:inline-flex;align-items:center;gap:6px}
  .btn-text .arr{display:inline-block;transition:.15s}
  .btn-text:hover .arr{transform:translateX(4px)}
  .hero-meta{margin-top:36px;display:flex;gap:28px;flex-wrap:wrap;color:#aaa;font-size:13px}
  .hero-meta span{display:inline-flex;align-items:center;gap:7px}
  .hero-meta i{width:6px;height:6px;border-radius:50%;background:var(--xh-orange)}
  .hero-art{position:relative;z-index:1;min-height:320px;display:flex;align-items:center;justify-content:center}
  .hero-art svg{max-width:100%;height:auto;filter:drop-shadow(0 24px 60px rgba(0,0,0,.45))}
  .hero-art .iso{position:absolute;inset:0;z-index:-1}
  .hero-art .iso svg{width:100%;height:100%}
  .hero::after{content:"";position:absolute;right:-10%;top:-20%;width:680px;height:680px;background:radial-gradient(circle,rgba(233,84,32,.18) 0%,transparent 65%);pointer-events:none}

  /* ---------- 现代化企业与开源（两栏暗色） ---------- */
  .enterprise{background:#0f0f0f;color:#fff;padding:64px 0 90px;border-top:1px solid #222}
  .enterprise-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start}
  .enterprise h2{font-size:clamp(30px,3.8vw,44px);font-weight:700;line-height:1.15;letter-spacing:-.4px;max-width:14ch}
  .enterprise .right{padding-top:6px}
  .enterprise .right h3{font-size:18px;font-weight:700;margin-bottom:16px;color:#fff}
  .enterprise .right p{font-size:15px;color:#bbb;line-height:1.7;margin-bottom:16px;max-width:54ch}
  .enterprise .right a{color:var(--xh-blue);font-weight:500;font-size:15px;display:inline-flex;align-items:center;gap:5px}
  .enterprise .right a .arr{transition:.15s}
  .enterprise .right a:hover .arr{transform:translateX(4px)}

  /* ---------- 广泛的产品组合 ---------- */
  .products{background:#0f0f0f;color:#fff;padding:96px 0 80px;border-top:1px solid #222}
  .products .sec-head{text-align:left;margin:0 0 56px;max-width:none}
  .products .sec-head h2{font-size:clamp(32px,4vw,48px);font-weight:700;letter-spacing:-.4px;margin-bottom:10px}
  .products .sec-head p{color:#aaa;font-size:17px;max-width:60ch}
  .products-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
  .product-card{background:#161616;border:1px solid #222;border-radius:8px;padding:24px;transition:.18s;display:flex;flex-direction:column;height:100%}
  .product-card:hover{border-color:#333;background:#1a1a1a}
  .product-card .art{height:150px;margin-bottom:18px;display:flex;align-items:center;justify-content:center}
  .product-card .art svg{max-width:100%;max-height:100%}
  .product-card h3{font-size:17px;font-weight:700;margin-bottom:10px}
  .product-card p{color:#aaa;font-size:14px;line-height:1.6;margin-bottom:16px;flex:1}
  .product-card a{color:#69c;font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:5px}
  .product-card a .arr{transition:.15s}
  .product-card a:hover .arr{transform:translateX(4px)}

  /* ---------- 加速创新 ---------- */
  .innovation{background:#0f0f0f;color:#fff;padding:0 0 96px;border-top:1px solid #222}
  .innovation h2{font-size:clamp(30px,3.8vw,44px);font-weight:700;letter-spacing:-.4px;margin-bottom:10px}
  .innovation .lead{color:#aaa;font-size:17px;max-width:70ch;margin-bottom:48px}
  .innovation-grid{display:grid;grid-template-columns:260px 1fr;gap:60px;align-items:start}
  .innovation-nav{display:flex;flex-direction:column;gap:8px}
  .innovation-nav button{background:transparent;border:none;color:#aaa;text-align:left;padding:14px 16px;border-radius:6px;font-size:15px;cursor:pointer;transition:.15s;font-family:inherit}
  .innovation-nav button:hover,.innovation-nav button.active{color:#fff;background:#1a1a1a}
  .innovation-pane{display:none}
  .innovation-pane.active{display:block}
  .innovation-pane h3{font-size:18px;font-weight:700;margin-bottom:14px;color:#fff}
  .innovation-pane p{color:#aaa;font-size:15px;line-height:1.7;margin-bottom:28px;max-width:60ch}
  .partner-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
  .partner{background:#161616;border:1px solid #222;border-radius:8px;padding:20px;display:flex;align-items:center;justify-content:center;height:86px}
  .partner span{font-size:17px;font-weight:700;color:#fff;letter-spacing:.5px}
  .partner-more{display:inline-flex;margin-top:26px;color:#69c;font-weight:500;gap:5px;font-size:15px}
  .partner-more .arr{transition:.15s}
  .partner-more:hover .arr{transform:translateX(4px)}

  /* ---------- 特性（深色卡片） ---------- */
  .block{padding:96px 0;background:#0f0f0f}
  .block.alt{background:#131313}
  .sec-head{text-align:center;max-width:680px;margin:0 auto 56px}
  .sec-head .kicker{color:var(--xh-orange);font-weight:700;letter-spacing:1.5px;text-transform:uppercase;font-size:12px}
  .sec-head h2{font-size:clamp(28px,3.4vw,40px);margin:10px 0 12px;font-weight:700;letter-spacing:-.3px;color:#fff}
  .sec-head p{color:#aaa;font-size:17px}
  .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
  .card{background:#161616;border:1px solid #222;border-radius:6px;padding:28px;transition:.18s}
  .card:hover{border-color:#333;box-shadow:0 10px 30px rgba(0,0,0,.4)}
  .card .ico{width:44px;height:44px;border-radius:8px;display:grid;place-items:center;background:linear-gradient(135deg,var(--xh-purple),#a3348f);color:#fff;margin-bottom:16px}
  .card .ico svg{width:22px;height:22px}
  .card h3{font-size:17px;margin-bottom:8px;color:#fff;font-weight:700}
  .card p{color:#aaa;font-size:15px;line-height:1.55}

  /* ---------- 在线体验 ---------- */
  .try{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
  .try .copy h2{font-size:clamp(26px,3vw,34px);font-weight:700;margin-bottom:14px;color:#fff}
  .try .copy p{color:#aaa;font-size:17px;margin-bottom:26px;line-height:1.6}
  .btn-outline{background:transparent;color:#fff;border:1.5px solid #555;padding:11px 22px;border-radius:4px;font-weight:500;font-size:15px;transition:.15s;display:inline-flex;align-items:center;gap:8px}
  .btn-outline:hover{background:#fff;color:#0f0f0f;border-color:#fff}
  .mock{background:#1d1226;border-radius:12px;padding:14px;box-shadow:0 26px 60px rgba(0,0,0,.25);border:1px solid #3a2340}
  .mock .bar{display:flex;align-items:center;gap:8px;padding:6px 4px 12px}
  .mock .bar i{width:11px;height:11px;border-radius:50%;background:#4a3a52;display:block}
  .mock .bar i:first-child{background:var(--xh-orange)}
  .mock .screen{background:linear-gradient(135deg,#3a1230,#5e1a55);border-radius:8px;height:260px;position:relative;overflow:hidden}
  .mock .screen::before{content:"";position:absolute;inset:0;background:radial-gradient(300px 160px at 80% 10%,rgba(233,84,32,.4),transparent 60%)}
  .mock .tb{position:absolute;left:0;right:0;bottom:0;height:34px;background:rgba(20,8,18,.7);display:flex;align-items:center;gap:8px;padding:0 10px}
  .mock .tb .start{width:14px;height:14px;border-radius:3px;background:var(--xh-orange)}
  .mock .tb .app{width:18px;height:18px;border-radius:4px;background:rgba(255,255,255,.22)}
  .mock .desk-ico{position:absolute;top:22px;left:22px;width:34px;height:34px;border-radius:8px;background:rgba(255,255,255,.14);box-shadow:0 4px 14px rgba(0,0,0,.3)}

  /* ---------- 下载 ---------- */
  .editions{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
  .ed{background:#161616;border:1px solid #222;border-radius:6px;padding:28px;display:flex;flex-direction:column;transition:.18s}
  .ed:hover{border-color:#333;box-shadow:0 10px 30px rgba(0,0,0,.4)}
  .ed .tag{font-size:12px;font-weight:700;color:var(--xh-orange);letter-spacing:.5px;text-transform:uppercase}
  .ed h3{font-size:21px;margin:8px 0 10px;color:#fff;font-weight:700}
  .ed p{color:#aaa;font-size:14.5px;line-height:1.55;flex:1}
  .ed .meta{font-size:13px;color:#888;margin:14px 0 18px}
  .ed .note{font-size:13px;color:var(--xh-purple);background:rgba(119,33,111,.07);padding:8px 12px;border-radius:6px;margin-bottom:16px}
  .ed .btn{justify-content:center;border-radius:4px}

  /* ---------- 页脚 ---------- */
  footer{background:#0f0f0f;color:rgba(255,255,255,.72);padding:60px 0 32px;border-top:1px solid #222}
  footer .footer-cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:32px}
  footer .footer-brand .logo{display:inline-block;margin-bottom:14px}
  footer .footer-brand .logo img{height:30px;width:auto;display:block}
  footer .footer-desc{font-size:14px;color:rgba(255,255,255,.55);max-width:34ch;margin-bottom:18px;line-height:1.55}
  footer .footer-socials{display:flex;gap:10px}
  footer .social-btn{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:rgba(255,255,255,.08);color:#fff;font-size:14px;font-weight:700;transition:.18s}
  footer .social-btn:hover{background:var(--xh-orange)}
  footer h4{color:#fff;font-size:12px;letter-spacing:1px;margin-bottom:16px;font-weight:700}
  footer ul{list-style:none}
  footer li{margin-bottom:10px;font-size:14px}
  footer a:hover{color:#fff}
  .footer-bot{border-top:1px solid rgba(255,255,255,.12);margin-top:40px;padding-top:22px;font-size:13px;color:rgba(255,255,255,.45);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
  .footer-bot a:hover{color:#fff}

  /* ---------- 响应式 ---------- */
  @media(max-width:980px){
    .hero-grid,.enterprise-grid,.try{grid-template-columns:1fr;gap:36px}
    .hero-art{order:-1;min-height:240px}
    .grid,.editions,.products-grid{grid-template-columns:1fr 1fr}
    .partner-grid{grid-template-columns:1fr 1fr}
    .innovation-grid{grid-template-columns:1fr;gap:32px}
    footer .footer-cols{grid-template-columns:1fr 1fr}
  }
  @media(max-width:720px){
    nav.links{display:none}
    .nav-cta .all-sanhana{display:none}
    .menu-btn{display:block}
    .grid,.editions,.products-grid,footer .footer-cols{grid-template-columns:1fr}
    .hero{padding:60px 0 72px}
    .wrap{padding:0 20px}
    .mobile-open nav.links{display:flex;position:absolute;top:60px;left:0;right:0;flex-direction:column;background:#0f0f0f;padding:16px 20px;gap:4px;border-bottom:1px solid #222;box-shadow:0 20px 40px rgba(0,0,0,.4)}
    .mobile-open nav.links a,.mobile-open nav.links .has-menu{padding:10px 0}
  }

/* ============ 子页面通用版式 ============ */
.crumb{font-size:13px;color:#888;padding:18px 0 0}
.crumb a{color:#aaa}
.crumb a:hover{color:#fff}
.crumb span{margin:0 6px;color:#555}
.subhero{background:#0f0f0f;color:#fff;padding:54px 0 56px;border-bottom:1px solid #222}
.subhero h1{font-size:clamp(34px,4.4vw,52px);font-weight:700;letter-spacing:-.5px;line-height:1.1;max-width:18ch}
.subhero p{margin-top:16px;font-size:18px;color:#bbb;max-width:62ch;line-height:1.6}
.subbody{padding:72px 0 96px;background:#0f0f0f}
.subbody.alt{background:#131313}
.sub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.sub-grid.two{grid-template-columns:repeat(2,1fr)}
.panel{background:#161616;border:1px solid #222;border-radius:8px;padding:28px;transition:.18s}
.panel:hover{border-color:#333}
.panel h3{font-size:19px;font-weight:700;margin-bottom:12px;color:#fff}
.panel p{color:#aaa;font-size:14.5px;line-height:1.6}
.panel .ico{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--xh-purple),#a3348f);color:#fff;margin-bottom:18px}
.panel .ico svg{width:22px;height:22px}
.panel a.more{display:inline-flex;align-items:center;gap:5px;color:#69c;font-size:14px;font-weight:500;margin-top:16px}
.panel a.more .arr{transition:.15s}
.panel a.more:hover .arr{transform:translateX(4px)}
.lead-block{max-width:760px;margin-bottom:48px}
.lead-block h2{font-size:clamp(26px,3vw,34px);font-weight:700;color:#fff;margin-bottom:14px}
.lead-block p{color:#aaa;font-size:16px;line-height:1.7}
/* 列表型（博客/资源/案例） */
.lists{display:flex;flex-direction:column;gap:14px;max-width:920px}
.list-item{display:flex;gap:18px;align-items:flex-start;background:#161616;border:1px solid #222;border-radius:8px;padding:20px 22px;transition:.18s}
.list-item:hover{border-color:#333;background:#1a1a1a}
.list-item .li-ico{flex:none;width:40px;height:40px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--xh-orange),#c3410f);color:#fff}
.list-item .li-ico svg{width:20px;height:20px}
.list-item h3{font-size:17px;color:#fff;font-weight:700;margin-bottom:6px}
.list-item h3 a{color:inherit}
.list-item p{color:#aaa;font-size:14px;line-height:1.55}
.list-item .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--xh-orange);letter-spacing:.4px;text-transform:uppercase;margin-bottom:6px}
.list-item .meta{font-size:12.5px;color:#777;margin-top:8px}
.list-item a.go{display:inline-flex;align-items:center;gap:5px;color:#69c;font-weight:500;font-size:13.5px;margin-top:10px}
.list-item a.go .arr{transition:.15s}
.list-item a.go:hover .arr{transform:translateX(4px)}
@media(max-width:980px){.sub-grid,.sub-grid.two{grid-template-columns:1fr 1fr}}
@media(max-width:720px){.sub-grid,.sub-grid.two{grid-template-columns:1fr}}

/* ============ 导航下拉（All Sanhana / 生态） ============ */
.dropdown{position:relative}
.dropdown-menu{position:absolute;right:0;top:calc(100% + 10px);min-width:200px;background:#161616;border:1px solid #2a2a2a;border-radius:10px;padding:8px;display:none;flex-direction:column;box-shadow:0 20px 50px rgba(0,0,0,.5);z-index:60}
.dropdown.open .dropdown-menu{display:flex}
.dropdown-menu a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:7px;color:#ddd;font-size:14px;transition:.15s}
.dropdown-menu a:hover{background:#222;color:#fff}
.dropdown-menu a .dot{width:7px;height:7px;border-radius:50%;background:var(--xh-orange);flex:none}
.all-sanhana{cursor:pointer;user-select:none;display:inline-flex;align-items:center;gap:6px;color:#cfcfcf;font-size:14px;padding:8px 12px;border:1px solid #2a2a2a;border-radius:7px;transition:.15s}
.all-sanhana:hover{color:#fff;border-color:#3a3a3a}
.all-sanhana .chev{width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;transition:.2s}
.dropdown.open .all-sanhana .chev{transform:rotate(180deg)}
@media(max-width:720px){.dropdown-menu{position:static;box-shadow:none;border:none;background:transparent;padding:4px 0}}


/* ============ 下载页（仿 ubuntu.com 下载布局） ============ */
.download-hero{background:#0f0f0f;color:#fff;padding:64px 0 72px;border-bottom:1px solid #222}
.download-hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.download-hero h1{font-size:clamp(36px,5vw,56px);font-weight:700;letter-spacing:-.6px;line-height:1.1;max-width:16ch}
.download-hero p.lead{margin-top:18px;font-size:18px;color:#aaa;max-width:58ch;line-height:1.65}
.download-hero .art{min-height:280px;display:flex;align-items:center;justify-content:center}
.download-hero .art svg{max-width:100%;height:auto;filter:drop-shadow(0 24px 60px rgba(0,0,0,.45))}
.download-body{padding:72px 0 96px;background:#0f0f0f}
.download-section{display:grid;grid-template-columns:320px 1fr;gap:40px;align-items:start;padding:42px 0;border-bottom:1px solid #222}
.download-section:first-of-type{padding-top:0}
.download-section:last-of-type{border-bottom:none}
.download-section h2{font-size:clamp(26px,3.2vw,36px);font-weight:700;letter-spacing:-.4px;color:#fff;line-height:1.15;max-width:14ch}
.download-card{background:#161616;border:1px solid #222;border-radius:8px;padding:28px}
.download-card h3{font-size:20px;font-weight:700;color:#fff;margin-bottom:10px}
.download-card .tag{display:inline-block;font-size:12px;font-weight:700;color:var(--xh-orange);letter-spacing:.4px;text-transform:uppercase;margin-bottom:14px}
.download-card p{color:#aaa;font-size:15px;line-height:1.65;margin-bottom:20px;max-width:66ch}
.download-card .meta{font-size:13px;color:#888;margin-bottom:18px}
.download-card .actions{display:flex;gap:14px;flex-wrap:wrap;align-items:center;margin-bottom:22px}
.download-card .btn-green{padding:11px 24px}
.download-card .note{font-size:13px;color:#999;font-style:italic}
.req-list{list-style:none;margin:0;padding:0}
.req-list li{display:flex;align-items:flex-start;gap:10px;color:#aaa;font-size:14px;line-height:1.6;margin-bottom:10px}
.req-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--xh-green);margin-top:8px;flex:none}
.download-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.download-row .download-card{height:100%}
.other-list{display:flex;flex-direction:column;gap:14px}
.other-item{display:flex;gap:16px;align-items:flex-start;background:#161616;border:1px solid #222;border-radius:8px;padding:18px 20px;transition:.18s}
.other-item:hover{border-color:#333;background:#1a1a1a}
.other-item h4{font-size:16px;font-weight:700;color:#fff;margin-bottom:4px}
.other-item p{color:#999;font-size:13.5px;line-height:1.55}
.other-item .go{margin-left:auto;white-space:nowrap;color:#69c;font-weight:500;font-size:14px}
@media(max-width:980px){
  .download-hero-grid{grid-template-columns:1fr;gap:36px}
  .download-hero .art{order:-1;min-height:220px}
  .download-section{grid-template-columns:1fr;gap:22px}
  .download-section h2{max-width:none}
  .download-row{grid-template-columns:1fr}
}
@media(max-width:720px){
  .download-hero{padding:52px 0 60px}
  .download-card{padding:22px}
  .download-card .actions{flex-direction:column;align-items:flex-start}
}