:root{
    --ink:#1c0e0e;
    --ink-soft:#5b4242;
    --mist:#fdf6f5;
    --line:#f2e3e1;
    --brand:#d92b2b;
    --brand-deep:#9e1b1b;
    --brand-glow:rgba(217,43,43,.12);
    --accent:#ff7a45;
    --warm:#ff9f43;
    --green:#1f9d55;
    --radius:18px;
    --shadow:0 12px 32px rgba(60,15,15,.08);
    --maxw:1180px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
    color:var(--ink);
    background:
      radial-gradient(1100px 520px at 82% -12%, rgba(255,122,69,.12), transparent 62%),
      radial-gradient(900px 460px at -8% 4%, rgba(217,43,43,.14), transparent 60%),
      #fdfbfb;
    line-height:1.78;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;text-decoration:none;}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px;}

  /* ============ 顶部导航 ============ */
  .topbar{
    position:sticky;top:0;z-index:80;
    backdrop-filter:blur(16px);
    background:rgba(253,251,251,.84);
    border-bottom:1px solid var(--line);
  }
  .topbar-in{
    max-width:var(--maxw);margin:0 auto;padding:14px 22px;
    display:flex;align-items:center;gap:28px;
  }
  .logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:.4px;}
  .logo-mark{
    width:32px;height:32px;border-radius:10px;
    background:linear-gradient(135deg,var(--brand),var(--accent));
    display:grid;place-items:center;color:#fff;font-size:15px;font-weight:900;
    box-shadow:0 6px 16px var(--brand-glow);
  }
  .logo small{display:block;font-size:10px;font-weight:600;color:var(--ink-soft);letter-spacing:1.6px;line-height:1;}
  .nav{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap;}
  .nav a{padding:9px 14px;border-radius:10px;font-size:14.5px;font-weight:600;color:var(--ink-soft);transition:.22s;}
  .nav a:hover{background:var(--brand-glow);color:var(--brand-deep);}
  .nav a.hot{background:var(--ink);color:#fff;}
  .nav a.hot:hover{background:var(--brand-deep);}

  /* ============ 通用 ============ */
  section{padding:74px 0;}
  .sec-head{max-width:760px;margin-bottom:42px;}
  .eyebrow{
    display:inline-flex;align-items:center;gap:8px;
    font-size:12.5px;font-weight:800;letter-spacing:2px;
    color:var(--brand-deep);text-transform:uppercase;
    padding:6px 14px;border-radius:999px;
    background:var(--brand-glow);margin-bottom:16px;
  }
  h1{font-size:clamp(30px,4.6vw,50px);line-height:1.22;margin:0 0 18px;letter-spacing:-.8px;}
  h2{font-size:clamp(23px,3vw,34px);line-height:1.3;margin:0 0 14px;letter-spacing:-.5px;}
  h3{font-size:19px;margin:0 0 10px;letter-spacing:-.2px;}
  p{margin:0 0 14px;color:var(--ink-soft);}
  .lead{font-size:17.5px;color:var(--ink-soft);max-width:760px;}
  .grid{display:grid;gap:22px;}
  .g2{grid-template-columns:repeat(2,1fr);}
  .g3{grid-template-columns:repeat(3,1fr);}
  .g4{grid-template-columns:repeat(4,1fr);}
  @media(max-width:960px){.g3,.g4{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:680px){.g2,.g3,.g4{grid-template-columns:1fr;}.nav a{padding:7px 10px;font-size:13.5px;}}

  .card{
    background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:26px;box-shadow:var(--shadow);transition:.26s;
  }
  .card:hover{transform:translateY(-4px);border-color:#f7ccc7;}
  .card .ico{
    width:44px;height:44px;border-radius:13px;display:grid;place-items:center;
    font-size:20px;margin-bottom:14px;
    background:linear-gradient(135deg,rgba(217,43,43,.14),rgba(255,122,69,.18));
  }
  .card p:last-child{margin-bottom:0;}

  /* ============ Hero ============ */
  .hero{padding:86px 0 70px;position:relative;overflow:hidden;}
  .hero::after{
    content:"";position:absolute;right:-160px;top:-80px;width:520px;height:520px;
    border-radius:50%;
    background:conic-gradient(from 200deg,rgba(217,43,43,.16),rgba(255,122,69,.16),transparent 70%);
    filter:blur(6px);z-index:-1;
  }
  .hero-in{display:grid;grid-template-columns:1.08fr .92fr;gap:52px;align-items:center;}
  @media(max-width:940px){.hero-in{grid-template-columns:1fr;gap:36px;}}
  .btnrow{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px;}
  .btn{display:inline-flex;align-items:center;gap:9px;padding:14px 26px;border-radius:13px;font-weight:800;font-size:15.5px;transition:.24s;}
  .btn-main{background:var(--ink);color:#fff;box-shadow:0 12px 26px rgba(60,15,15,.22);}
  .btn-main:hover{background:var(--brand-deep);transform:translateY(-2px);}
  .btn-ghost{border:1.6px solid var(--line);background:#fff;color:var(--ink);}
  .btn-ghost:hover{border-color:var(--brand);color:var(--brand-deep);}

  .dev-stage{background:#fff;border:1px solid var(--line);border-radius:26px;padding:26px;box-shadow:0 22px 54px rgba(60,15,15,.1);}
  .dev-stage h4{margin:0 0 16px;font-size:13px;letter-spacing:1.8px;color:var(--ink-soft);text-transform:uppercase;font-weight:800;}
  .dev-row{
    display:flex;align-items:center;gap:13px;padding:13px 15px;border-radius:13px;
    border:1px solid var(--line);margin-bottom:10px;background:var(--mist);transition:.24s;
  }
  .dev-row:hover{background:#fff;border-color:#f7ccc7;transform:translateX(4px);}
  .dev-row span:nth-child(2){font-weight:700;font-size:15px;}
  .dev-row em{margin-left:auto;font-style:normal;font-size:12.5px;font-weight:700;color:var(--brand-deep);background:rgba(217,43,43,.1);padding:4px 11px;border-radius:999px;}
  .sync-bar{margin-top:16px;padding:15px 17px;border-radius:14px;background:linear-gradient(120deg,#2a1010,#4c1c1c);color:#f3cfc9;font-size:13.5px;}
  .sync-bar b{color:#fff;}

  /* ============ 分栏推文区 ============ */
  .split-showcase{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .showcase-block{
    position:relative;border-radius:22px;padding:30px;
    border:1px solid var(--line);background:var(--mist);
    overflow:hidden;transition:.28s;
  }
  .showcase-block:hover{transform:translateY(-4px);border-color:#f7ccc7;box-shadow:var(--shadow);}
  .showcase-block .tagnum{
    position:absolute;right:18px;top:12px;font-size:62px;font-weight:900;line-height:1;
    color:rgba(217,43,43,.08);letter-spacing:-3px;
  }
  .showcase-block h3{position:relative;z-index:1;}
  .showcase-block p{position:relative;z-index:1;font-size:14.6px;}
  .showcase-block .go{
    position:relative;z-index:1;display:inline-flex;align-items:center;gap:6px;
    font-size:13.5px;font-weight:800;color:var(--brand-deep);margin-top:8px;
  }
  .showcase-block .go::after{content:"→";transition:.24s;}
  .showcase-block:hover .go::after{transform:translateX(5px);}

  /* ============ 时间线 ============ */
  .timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:step;}
  @media(max-width:900px){.timeline{grid-template-columns:1fr;}}
  .time-card{
    position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
    padding:26px 26px 26px 72px;box-shadow:var(--shadow);transition:.26s;
  }
  .time-card:hover{transform:translateY(-4px);border-color:#f7ccc7;}
  .time-card::before{
    counter-increment:step;content:counter(step);
    position:absolute;left:24px;top:26px;width:32px;height:32px;border-radius:10px;
    display:grid;place-items:center;font-size:14px;font-weight:900;color:#fff;
    background:linear-gradient(135deg,var(--brand),var(--accent));
    box-shadow:0 6px 14px var(--brand-glow);
  }
  .time-card h3{margin-bottom:6px;}
  .time-card p:last-child{margin-bottom:0;}

  /* ============ 友情链接 ============ */
  .friendlinks{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:44px 0;}
  .friendlinks h4{font-size:13px;letter-spacing:2px;text-transform:uppercase;color:var(--ink-soft);margin:0 0 18px;font-weight:800;}
  .link-cloud{display:flex;flex-wrap:wrap;gap:10px 12px;}
  .link-cloud a{
    display:inline-block;font-size:13.6px;font-weight:600;padding:7px 15px;border-radius:999px;
    border:1px solid var(--line);color:var(--ink-soft);background:var(--mist);transition:.22s;
  }
  .link-cloud a:hover{color:#fff;background:var(--brand);border-color:var(--brand);transform:translateY(-2px);box-shadow:0 8px 18px var(--brand-glow);}
  .link-cloud a.more{background:transparent;border-style:dashed;color:var(--brand-deep);}
  .link-cloud a.more:hover{background:var(--brand-deep);color:#fff;border-style:solid;}

  /* ============ 页脚 ============ */
  footer{background:#1c0e0e;color:#c9a9a5;padding:60px 0 30px;margin-top:30px;}
  .foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px;}
  @media(max-width:900px){.foot-grid{grid-template-columns:1fr 1fr;}}
  @media(max-width:560px){.foot-grid{grid-template-columns:1fr;}}
  footer h5{color:#fff;font-size:14px;margin:0 0 15px;letter-spacing:1.2px;}
  footer a{display:block;font-size:13.8px;padding:5px 0;color:#c9a9a5;transition:.2s;}
  footer a:hover{color:#fff;padding-left:5px;}
  .foot-bottom{
    border-top:1px solid rgba(255,255,255,.1);margin-top:42px;padding-top:22px;
    font-size:12.8px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;
  }
  .foot-note{font-size:12.5px;line-height:1.85;color:#b08d89;}

  /* ================================================================
     新增版块 01：智能设备自检
  ================================================================ */
  .smart-check{
    background:linear-gradient(135deg,#fff 0%,#fff8f7 100%);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
  }
  .check-shell{
    display:grid;grid-template-columns:.9fr 1.1fr;gap:44px;align-items:center;
  }
  @media(max-width:900px){.check-shell{grid-template-columns:1fr;gap:30px;}}
  .check-panel{
    background:#fff;border:1px solid var(--line);border-radius:24px;
    padding:30px;box-shadow:0 20px 48px rgba(60,15,15,.09);
  }
  .check-panel h4{
    margin:0 0 6px;font-size:17px;letter-spacing:-.2px;
  }
  .check-panel .hint{font-size:13.5px;color:var(--ink-soft);margin-bottom:20px;}
  .os-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:22px;}
  @media(max-width:560px){.os-grid{grid-template-columns:repeat(2,1fr);}}
  .os-btn{
    display:flex;flex-direction:column;align-items:center;gap:7px;
    padding:16px 8px;border-radius:14px;border:1.6px solid var(--line);
    background:var(--mist);cursor:pointer;transition:.22s;font-size:12.8px;font-weight:700;
    color:var(--ink-soft);text-align:center;
  }
  .os-btn .os-ico{font-size:22px;line-height:1;}
  .os-btn:hover{border-color:var(--brand);color:var(--brand-deep);transform:translateY(-2px);}
  .os-btn.active{
    background:linear-gradient(135deg,var(--brand),var(--accent));
    border-color:transparent;color:#fff;
    box-shadow:0 10px 22px var(--brand-glow);
  }
  .check-result{
    border-radius:16px;padding:20px 22px;
    background:linear-gradient(120deg,#2a1010,#4c1c1c);color:#f3cfc9;
    font-size:14px;line-height:1.8;min-height:98px;
  }
  .check-result b{color:#fff;}
  .check-result .res-title{
    display:block;font-size:12px;letter-spacing:1.8px;text-transform:uppercase;
    color:#e28b83;font-weight:800;margin-bottom:8px;
  }
  .check-result a{color:#ffb4a8;font-weight:800;text-decoration:underline;text-underline-offset:3px;}
  .check-visual{
    display:flex;flex-direction:column;gap:14px;
  }
  .check-visual .stat-strip{
    display:flex;gap:12px;flex-wrap:wrap;
  }
  .check-visual .stat-pill{
    flex:1;min-width:140px;
    background:#fff;border:1px solid var(--line);border-radius:16px;
    padding:16px 18px;box-shadow:var(--shadow);
  }
  .check-visual .stat-pill strong{
    display:block;font-size:26px;letter-spacing:-1px;
    background:linear-gradient(135deg,var(--brand),var(--accent));
    -webkit-background-clip:text;background-clip:text;color:transparent;
  }
  .check-visual .stat-pill span{font-size:12.8px;color:var(--ink-soft);font-weight:600;}

  /* ================================================================
     新增版块 02：节点状态可视化
  ================================================================ */
  .node-board{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .node-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
  @media(max-width:960px){.node-grid{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:560px){.node-grid{grid-template-columns:1fr;}}
  .node-card{
    border:1px solid var(--line);border-radius:16px;
    padding:18px 20px;background:var(--mist);transition:.24s;
  }
  .node-card:hover{background:#fff;border-color:#f7ccc7;transform:translateY(-3px);box-shadow:var(--shadow);}
  .node-card .node-top{
    display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;
  }
  .node-card .node-name{font-weight:800;font-size:14.5px;}
  .node-card .node-dot{
    width:9px;height:9px;border-radius:50%;background:var(--green);
    box-shadow:0 0 0 4px rgba(31,157,85,.14);
  }
  .node-card .node-dot.warn{background:var(--warm);box-shadow:0 0 0 4px rgba(255,159,67,.16);}
  .node-card .node-dot.busy{background:var(--brand);box-shadow:0 0 0 4px rgba(217,43,43,.14);}
  .load-track{
    height:7px;border-radius:999px;background:#f0dedb;overflow:hidden;margin-bottom:8px;
  }
  .load-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--brand));}
  .load-fill.mid{background:linear-gradient(90deg,#ffb84d,var(--warm));}
  .load-fill.high{background:linear-gradient(90deg,#f06a6a,var(--brand));}
  .node-meta{display:flex;justify-content:space-between;font-size:12.6px;color:var(--ink-soft);font-weight:600;}
  .node-board .board-note{
    margin-top:22px;font-size:12.8px;color:#a08b8b;
    display:flex;align-items:center;gap:8px;
  }

  /* ================================================================
     新增版块 03：连接拓扑图
  ================================================================ */
  .topo-section{
    background:linear-gradient(160deg,#1c0e0e 0%,#331414 100%);
    color:#f3cfc9;
  }
  .topo-section .eyebrow{background:rgba(255,180,168,.12);color:#ffb4a8;}
  .topo-section h2{color:#fff;}
  .topo-section .lead{color:#d8b3ae;}
  .topo{display:grid;grid-template-columns:1fr auto 1fr;gap:20px;align-items:center;margin-top:34px;}
  @media(max-width:860px){.topo{grid-template-columns:1fr;gap:22px;}}
  .topo-col{display:flex;flex-direction:column;gap:12px;}
  .topo-node{
    display:flex;align-items:center;gap:12px;
    padding:14px 18px;border-radius:14px;
    background:rgba(255,255,255,.06);
    border:1px solid rgba(255,180,168,.16);
    font-size:14px;font-weight:700;color:#fff;
    transition:.24s;
  }
  .topo-node:hover{background:rgba(255,180,168,.1);border-color:rgba(255,180,168,.34);transform:translateX(4px);}
  .topo-node .t-ico{font-size:19px;}
  .topo-node small{display:block;font-size:11.8px;color:#c9a09a;font-weight:600;letter-spacing:.3px;}
  .topo-hub{
    text-align:center;padding:26px 30px;border-radius:22px;
    background:linear-gradient(135deg,var(--brand),var(--accent));
    box-shadow:0 20px 48px rgba(217,43,43,.32);
    min-width:190px;
  }
  .topo-hub .hub-q{
    font-size:34px;font-weight:900;color:#fff;letter-spacing:-1px;line-height:1;
    margin-bottom:6px;
  }
  .topo-hub .hub-label{font-size:12.5px;color:rgba(255,255,255,.86);font-weight:700;letter-spacing:1.2px;text-transform:uppercase;}
  .topo-hub .hub-desc{font-size:12px;color:rgba(255,255,255,.7);margin-top:8px;line-height:1.6;}
  .topo-lines{
    display:flex;flex-direction:column;gap:2px;align-items:center;
  }
  .topo-lines span{
    font-size:11px;letter-spacing:1.6px;color:#b08d89;font-weight:700;text-transform:uppercase;
  }
  .topo-lines .arrow{
    font-size:20px;color:var(--accent);line-height:1;
  }

  /* ================================================================
     新增版块 04：数据面板
  ================================================================ */
  .data-strip{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
  @media(max-width:900px){.data-grid{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:480px){.data-grid{grid-template-columns:1fr;}}
  .data-cell{text-align:center;padding:10px;}
  .data-cell .num{
    font-size:clamp(34px,5vw,52px);font-weight:900;line-height:1;letter-spacing:-2px;
    background:linear-gradient(135deg,var(--brand),var(--accent));
    -webkit-background-clip:text;background-clip:text;color:transparent;
  }
  .data-cell .num em{font-style:normal;font-size:.45em;letter-spacing:0;font-weight:800;}
  .data-cell .cap{margin-top:8px;font-size:14px;font-weight:700;color:var(--ink);}
  .data-cell .sub{font-size:12.5px;color:var(--ink-soft);line-height:1.65;margin-top:4px;}

  /* ================================================================
     新增版块 05：安全徽章墙
  ================================================================ */
  .badge-wall{background:var(--mist);}
  .badges{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;}
  .badge{
    display:inline-flex;align-items:center;gap:9px;
    padding:11px 20px;border-radius:999px;
    background:#fff;border:1px solid var(--line);
    font-size:13.8px;font-weight:700;color:var(--ink);
    box-shadow:0 6px 16px rgba(60,15,15,.05);
    transition:.22s;
  }
  .badge:hover{transform:translateY(-3px);border-color:#f7ccc7;box-shadow:0 12px 26px rgba(60,15,15,.09);}
  .badge .b-dot{width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--accent));}

  /* ================================================================
     新增版块 06：FAQ 速查
  ================================================================ */
  .faq-section{background:#fff;border-top:1px solid var(--line);}
  .faq-list{display:grid;gap:12px;max-width:880px;margin:0 auto;}
  .faq-item{
    border:1px solid var(--line);border-radius:16px;background:var(--mist);
    overflow:hidden;transition:.22s;
  }
  .faq-item:hover{border-color:#f7ccc7;}
  .faq-item summary{
    list-style:none;cursor:pointer;padding:18px 22px;
    font-weight:700;font-size:15.2px;color:var(--ink);
    display:flex;align-items:center;gap:12px;
    transition:.22s;
  }
  .faq-item summary::-webkit-details-marker{display:none;}
  .faq-item summary::before{
    content:"?";flex:0 0 auto;
    width:24px;height:24px;border-radius:8px;
    display:grid;place-items:center;
    font-size:13px;font-weight:900;color:#fff;
    background:linear-gradient(135deg,var(--brand),var(--accent));
    transition:.22s;
  }
  .faq-item[open] summary::before{content:"—";}
  .faq-item summary::after{
    content:"+";margin-left:auto;font-size:20px;font-weight:400;
    color:var(--ink-soft);transition:.24s;
  }
  .faq-item[open] summary::after{transform:rotate(45deg);color:var(--brand-deep);}
  .faq-item[open]{background:#fff;box-shadow:var(--shadow);}
  .faq-body{padding:0 22px 20px 58px;font-size:14.4px;color:var(--ink-soft);line-height:1.82;}
  .faq-body a{color:var(--brand-deep);font-weight:700;text-decoration:underline;text-underline-offset:3px;}