:root{
      --bg0:#fbf7ef;
      --bg1:#f3efe6;
      --card:#ffffff;
      --text:#1f2328;
      --muted:#5b616b;
      --line:rgba(35,38,44,.12);
      --shadow: 0 18px 40px rgba(20,28,45,.08);
      --shadow2: 0 10px 22px rgba(20,28,45,.08);
      --accent:#b56b2b;
      --accent2:#7a4a2b;
      --accent3:#b08b4a;
      --focus: rgba(181,107,43,.28);
      --radius:18px;
      --radius2:14px;
      --container: 1120px;
      --pad: 18px;
    }
    *{box-sizing:border-box}
    html,body{height:100%}
    body{
      margin:0;
      color:var(--text);
      font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC","Hiragino Sans GB","Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
      background:
        radial-gradient(900px 500px at 20% -10%, rgba(181,107,43,.18), transparent 60%),
        radial-gradient(700px 420px at 80% 10%, rgba(176,139,74,.14), transparent 62%),
        linear-gradient(180deg, var(--bg0), var(--bg1));
    }
    a{color:inherit}
    .container{
      width:100%;
      max-width: var(--container);
      padding: 0 var(--pad);
      margin: 0 auto;
    }

    header{
      position: sticky;
      top:0;
      z-index:20;
      backdrop-filter: blur(10px);
      background: rgba(251,247,239,.72);
      border-bottom: 1px solid rgba(35,38,44,.08);
    }
    .nav{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap:14px;
      padding: 14px 0;
    }
    .brand{
      display:flex;
      align-items:center;
      gap:12px;
      min-width: 120px;
    }
    .logo{
      width:40px;height:40px;
      border-radius: 12px;
      background:
        radial-gradient(12px 12px at 30% 35%, rgba(255,255,255,.75), transparent 55%),
        linear-gradient(135deg, rgba(181,107,43,.95), rgba(122,74,43,.9));
      box-shadow: 0 10px 22px rgba(181,107,43,.22);
      display:grid;
      place-items:center;
      border:1px solid rgba(255,255,255,.35);
    }
    .logo span{
      color:#fff;
      font-weight:900;
      letter-spacing: .5px;
      font-size:18px;
    }
    .brand b{
      font-size:14px;
      letter-spacing:.2px;
    }
    .brand small{
      display:block;
      margin-top:2px;
      color: var(--muted);
      font-size:12px;
      line-height:1.2;
    }

    .nav-right{
      display:flex;
      align-items:center;
      gap:10px;
    }
    .menu-btn{
      display:none;
      border: 1px solid rgba(35,38,44,.14);
      background: rgba(255,255,255,.72);
      color: var(--text);
      border-radius: 12px;
      padding: 10px 12px;
      cursor:pointer;
      box-shadow: 0 10px 18px rgba(20,28,45,.06);
      transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
    }
    .menu-btn:active{transform: translateY(1px)}
    .menu-btn:focus{outline:none; box-shadow: 0 0 0 4px var(--focus), 0 10px 18px rgba(20,28,45,.06)}
    .menu{
      display:flex;
      align-items:center;
      gap: 16px;
      flex-wrap: wrap;
      justify-content:flex-end;
    }
    .menu a{
      text-decoration:none;
      color: var(--muted);
      font-size:13px;
      padding: 8px 10px;
      border-radius: 12px;
      border: 1px solid transparent;
      transition: background .2s ease, color .2s ease, border-color .2s ease;
      white-space: nowrap;
    }
    .menu a:hover{
      background: rgba(255,255,255,.64);
      border-color: rgba(35,38,44,.10);
      color: var(--text);
    }

    .primary-btn{
      text-decoration:none;
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding: 10px 14px;
      border-radius: 14px;
      background:
        linear-gradient(135deg, rgba(181,107,43,.98), rgba(122,74,43,.96));
      color:#fff;
      border: 1px solid rgba(255,255,255,.18);
      box-shadow: 0 16px 34px rgba(181,107,43,.26);
      font-weight: 700;
      font-size: 13px;
      transition: transform .15s ease, box-shadow .15s ease, filter .15s ease;
      white-space: nowrap;
    }
    .primary-btn:hover{filter: brightness(1.02)}
    .primary-btn:active{transform: translateY(1px); box-shadow: 0 12px 26px rgba(181,107,43,.22)}
    .primary-btn:focus{outline:none; box-shadow: 0 0 0 4px var(--focus), 0 16px 34px rgba(181,107,43,.26)}
    .btn-icon{
      width:26px;height:26px;
      border-radius: 10px;
      background: rgba(255,255,255,.14);
      border: 1px solid rgba(255,255,255,.18);
      display:grid;
      place-items:center;
      font-size:14px;
    }

    main{padding: 22px 0 30px}
    .hero{
      padding: 22px 0 10px;
    }
    .hero-grid{
      display:grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 18px;
      align-items: stretch;
    }
    .hero-card{
      background: rgba(255,255,255,.70);
      border: 1px solid rgba(35,38,44,.10);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      padding: 20px;
      overflow:hidden;
      position: relative;
    }
    .hero-card:before{
      content:"";
      position:absolute;
      inset:-2px;
      background:
        radial-gradient(520px 240px at 18% 18%, rgba(181,107,43,.22), transparent 60%),
        radial-gradient(420px 200px at 80% 20%, rgba(176,139,74,.16), transparent 62%),
        radial-gradient(360px 220px at 60% 90%, rgba(122,74,43,.10), transparent 58%);
      pointer-events:none;
      opacity:.95;
    }
    .hero-inner{position:relative}
    .kicker{
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding: 8px 10px;
      border-radius: 999px;
      background: rgba(255,255,255,.62);
      border: 1px solid rgba(35,38,44,.10);
      color: var(--muted);
      font-size: 12px;
    }
    .kicker .dot{
      width:8px;height:8px;border-radius:50%;
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      box-shadow: 0 0 0 4px rgba(181,107,43,.18);
    }
    h1{
      margin: 12px 0 10px;
      font-size: clamp(22px, 3.2vw, 34px);
      line-height:1.15;
      letter-spacing: -0.4px;
    }
    .lead{
      margin: 0;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.7;
      max-width: 64ch;
    }
    .hero-actions{
      display:flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
      align-items:center;
    }
    .ghost-btn{
      text-decoration:none;
      display:inline-flex;
      align-items:center;
      gap:10px;
      padding: 10px 14px;
      border-radius: 14px;
      border: 1px solid rgba(35,38,44,.14);
      background: rgba(255,255,255,.62);
      color: var(--text);
      font-weight: 700;
      font-size: 13px;
      transition: transform .15s ease, box-shadow .15s ease, background .2s ease;
      white-space: nowrap;
    }
    .ghost-btn:hover{background: rgba(255,255,255,.80); box-shadow: 0 14px 30px rgba(20,28,45,.08)}
    .ghost-btn:active{transform: translateY(1px)}
    .ghost-btn:focus{outline:none; box-shadow: 0 0 0 4px var(--focus)}
    .badge{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding: 10px 12px;
      border-radius: 14px;
      border: 1px dashed rgba(35,38,44,.18);
      color: var(--muted);
      background: rgba(255,255,255,.55);
      font-size: 12px;
    }
    .badge svg{flex:0 0 auto}

    .hero-side{
      background: rgba(255,255,255,.62);
      border: 1px solid rgba(35,38,44,.10);
      border-radius: var(--radius);
      box-shadow: var(--shadow2);
      padding: 16px;
      position: relative;
      overflow:hidden;
    }
    .hero-side:before{
      content:"";
      position:absolute;
      inset:-40px -50px auto auto;
      width: 180px;
      height: 180px;
      background: radial-gradient(circle at 30% 30%, rgba(181,107,43,.28), transparent 60%);
      transform: rotate(18deg);
      pointer-events:none;
    }
    .side-inner{position:relative}
    .side-title{
      margin: 0 0 10px;
      font-size: 14px;
      letter-spacing:.2px;
    }
    .side-list{
      list-style:none;
      padding:0;margin:0;
      display:flex;
      flex-direction:column;
      gap:10px;
    }
    .side-item{
      display:flex;
      gap:10px;
      align-items:flex-start;
      padding: 12px 12px;
      border-radius: 14px;
      background: rgba(255,255,255,.66);
      border: 1px solid rgba(35,38,44,.10);
      transition: transform .18s ease, border-color .18s ease, background .18s ease;
    }
    .side-item:hover{
      transform: translateY(-2px);
      border-color: rgba(181,107,43,.25);
      background: rgba(255,255,255,.82);
    }
    .side-ic{
      width:32px;height:32px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(176,139,74,.35), rgba(181,107,43,.18));
      border: 1px solid rgba(181,107,43,.22);
      display:grid;
      place-items:center;
      color: var(--accent2);
      flex:0 0 auto;
      font-weight: 900;
      font-size: 14px;
    }
    .side-item b{
      font-size: 13px;
      display:block;
      margin-top:1px;
      letter-spacing:.1px;
    }
    .side-item span{
      display:block;
      font-size: 12px;
      color: var(--muted);
      margin-top:4px;
      line-height:1.5;
    }

    .toc{
      margin-top: 18px;
      background: rgba(255,255,255,.62);
      border: 1px solid rgba(35,38,44,.10);
      border-radius: var(--radius);
      box-shadow: 0 14px 30px rgba(20,28,45,.06);
      padding: 16px;
    }
    .toc-top{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap: 12px;
      flex-wrap: wrap;
    }
    .toc h2{
      margin:0;
      font-size: 14px;
      letter-spacing:.2px;
    }
    .toc p{
      margin:0;
      color: var(--muted);
      font-size: 12px;
    }
    .toc-grid{
      display:grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 10px;
      margin-top: 12px;
    }
    .toc a{
      text-decoration:none;
      display:flex;
      align-items:flex-start;
      gap:10px;
      padding: 12px 12px;
      border-radius: 14px;
      border: 1px solid rgba(35,38,44,.10);
      background: rgba(255,255,255,.66);
      transition: transform .18s ease, border-color .18s ease, background .18s ease;
      min-height: 60px;
    }
    .toc a:hover{
      transform: translateY(-2px);
      border-color: rgba(181,107,43,.25);
      background: rgba(255,255,255,.86);
    }
    .toc .tno{
      width:28px;height:28px;border-radius: 12px;
      display:grid;place-items:center;
      background: rgba(181,107,43,.12);
      border: 1px solid rgba(181,107,43,.20);
      color: var(--accent2);
      font-weight: 900;
      font-size: 12px;
      flex:0 0 auto;
    }
    .toc .tt{
      font-size: 12px;
      color: var(--text);
      font-weight: 800;
      letter-spacing:.1px;
      line-height:1.35;
      margin-top:2px;
    }

    section{margin-top: 18px}
    .grid-2{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      align-items:start;
    }
    .card{
      background: rgba(255,255,255,.68);
      border: 1px solid rgba(35,38,44,.10);
      border-radius: var(--radius);
      box-shadow: 0 14px 30px rgba(20,28,45,.06);
      padding: 18px;
      position: relative;
      overflow:hidden;
    }
    .card .cap{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap: 10px;
      margin-bottom: 10px;
    }
    .card h2{
      margin:0;
      font-size: 16px;
      letter-spacing: -.2px;
    }
    .pill{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding: 8px 10px;
      border-radius: 999px;
      border: 1px solid rgba(35,38,44,.12);
      background: rgba(255,255,255,.62);
      color: var(--muted);
      font-size: 12px;
      white-space: nowrap;
    }
    .pill i{
      width:8px;height:8px;border-radius:50%;
      background: linear-gradient(135deg, var(--accent), var(--accent2));
      box-shadow: 0 0 0 4px rgba(181,107,43,.16);
      display:inline-block;
    }

    .steps{
      display:flex;
      flex-direction:column;
      gap: 12px;
      margin-top: 8px;
    }
    .step{
      display:flex;
      gap: 12px;
      align-items:flex-start;
      padding: 12px 12px;
      border-radius: 16px;
      background: rgba(255,255,255,.70);
      border: 1px solid rgba(35,38,44,.10);
    }
    .step .num{
      width:34px;height:34px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(181,107,43,.22), rgba(176,139,74,.12));
      border: 1px solid rgba(181,107,43,.20);
      display:grid;
      place-items:center;
      font-weight: 900;
      color: var(--accent2);
      flex:0 0 auto;
    }
    .step b{display:block; font-size: 13px}
    .step span{display:block; color: var(--muted); margin-top:4px; font-size: 12px; line-height:1.6}

    .list{
      margin: 10px 0 0;
      padding: 0;
      list-style: none;
      display:flex;
      flex-direction:column;
      gap: 10px;
    }
    .list li{
      display:flex;
      gap: 10px;
      align-items:flex-start;
      padding: 12px 12px;
      border-radius: 16px;
      border: 1px solid rgba(35,38,44,.10);
      background: rgba(255,255,255,.70);
    }
    .list .mark{
      width:30px;height:30px;
      border-radius: 12px;
      background: rgba(181,107,43,.10);
      border: 1px solid rgba(181,107,43,.20);
      display:grid;place-items:center;
      font-weight: 900;
      color: var(--accent2);
      flex:0 0 auto;
      font-size: 13px;
    }
    .list b{font-size: 13px}
    .list p{
      margin:4px 0 0;
      color: var(--muted);
      font-size: 12px;
      line-height:1.6;
    }

    .accordion{
      margin-top: 14px;
      display:flex;
      flex-direction:column;
      gap: 10px;
    }
    details{
      border: 1px solid rgba(35,38,44,.10);
      background: rgba(255,255,255,.66);
      border-radius: var(--radius2);
      padding: 12px 12px;
      box-shadow: 0 12px 22px rgba(20,28,45,.04);
    }
    details[open]{
      border-color: rgba(181,107,43,.26);
      background: rgba(255,255,255,.80);
    }
    summary{
      cursor:pointer;
      list-style:none;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap: 12px;
      font-weight: 900;
      font-size: 13px;
      letter-spacing:.1px;
      outline:none;
    }
    summary::-webkit-details-marker{display:none}
    .sum-right{
      display:flex; align-items:center; gap:10px; color: var(--muted); font-weight:800; font-size:12px;
    }
    .chev{
      width:30px;height:30px;border-radius: 12px;
      border: 1px solid rgba(35,38,44,.12);
      background: rgba(255,255,255,.66);
      display:grid;place-items:center;
      transition: transform .2s ease, border-color .2s ease;
      flex:0 0 auto;
    }
    details[open] .chev{transform: rotate(180deg); border-color: rgba(181,107,43,.26)}
    details .answer{
      margin-top: 10px;
      color: var(--muted);
      font-size: 12.5px;
      line-height:1.75;
    }
    details .answer strong{color: var(--text)}
    .conclusion{
      background: rgba(255,255,255,.62);
      border: 1px solid rgba(35,38,44,.10);
      border-radius: var(--radius);
      box-shadow: 0 14px 30px rgba(20,28,45,.06);
      padding: 16px 18px;
      margin-top: 16px;
    }
    .conclusion h2{
      margin:0 0 8px;
      font-size: 16px;
    }
    .conclusion p{
      margin:0;
      color: var(--muted);
      line-height:1.75;
      font-size: 13px;
    }
    .inline-link{
      color: var(--accent2);
      text-decoration: none;
      border-bottom: 1px solid rgba(181,107,43,.38);
      padding-bottom: 2px;
      font-weight: 800;
    }
    .inline-link:hover{border-bottom-color: rgba(181,107,43,.70)}

    .figure{
      margin-top: 14px;
      display:grid;
      grid-template-columns: 1fr;
      gap: 10px;
      align-items:start;
    }
    figure{
      margin:0;
      border-radius: var(--radius);
      border: 1px solid rgba(35,38,44,.10);
      background: rgba(255,255,255,.66);
      box-shadow: 0 14px 30px rgba(20,28,45,.06);
      overflow:hidden;
    }
    .img-wrap{
      padding: 14px;
    }
    .img-frame{
      border-radius: 16px;
      overflow:hidden;
      border: 1px solid rgba(35,38,44,.10);
      background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.55));
    }
    img{
      width:100%;
      height:auto;
      display:block;
      object-fit: contain;
    }
    figcaption{
      padding: 0 16px 14px;
      color: var(--muted);
      font-size: 12.5px;
      line-height:1.6;
    }

    footer{
      background: #2a2f36;
      color: #e9edf2;
      border-top: 1px solid rgba(255,255,255,.10);
      margin-top: 18px;
    }
    .footer-inner{
      padding: 18px 0 16px;
    }
    .foot-grid{
      display:grid;
      grid-template-columns: 1.2fr .8fr;
      gap: 14px;
      align-items:start;
    }
    .foot-title{
      display:flex;
      align-items:center;
      gap: 12px;
      margin-bottom: 6px;
    }
    .foot-logo{
      width:38px;height:38px;border-radius: 14px;
      background: linear-gradient(135deg, rgba(181,107,43,.95), rgba(122,74,43,.92));
      display:grid;place-items:center;
      border: 1px solid rgba(255,255,255,.22);
      box-shadow: 0 14px 26px rgba(181,107,43,.22);
      flex:0 0 auto;
    }
    .foot-logo span{color:#fff;font-weight:900}
    .foot-title b{
      font-size: 14px;
      letter-spacing:.2px;
    }
    .foot-title small{
      display:block;
      margin-top:2px;
      color: rgba(233,237,242,.78);
      font-size: 12px;
      line-height:1.2;
    }
    .foot-text{
      color: rgba(233,237,242,.82);
      font-size: 12.5px;
      line-height:1.7;
      margin: 8px 0 0;
      max-width: 60ch;
    }
    .foot-links{
      display:flex;
      flex-direction:column;
      gap: 10px;
      align-items:flex-start;
      justify-content:flex-start;
    }
    .foot-links a{
      text-decoration:none;
      color: rgba(233,237,242,.88);
      border: 1px solid rgba(255,255,255,.16);
      background: rgba(255,255,255,.06);
      padding: 10px 12px;
      border-radius: 14px;
      transition: transform .15s ease, background .2s ease, border-color .2s ease;
      font-weight: 800;
      font-size: 12.5px;
      line-height:1.3;
      width:100%;
      text-align:left;
    }
    .foot-links a:hover{
      transform: translateY(-2px);
      background: rgba(255,255,255,.10);
      border-color: rgba(181,107,43,.36);
    }
    .copyright{
      border-top: 1px solid rgba(255,255,255,.10);
      padding-top: 12px;
      margin-top: 14px;
      color: rgba(233,237,242,.72);
      font-size: 12px;
      display:flex;
      flex-wrap:wrap;
      gap: 10px;
      align-items:center;
      justify-content:space-between;
    }
    .to-top{
      text-decoration:none;
      color: #fff;
      font-weight: 900;
      border: 1px solid rgba(255,255,255,.18);
      background: rgba(255,255,255,.06);
      padding: 8px 10px;
      border-radius: 12px;
      transition: transform .15s ease, background .2s ease, border-color .2s ease;
    }
    .to-top:hover{
      transform: translateY(-2px);
      background: rgba(255,255,255,.10);
      border-color: rgba(181,107,43,.40);
    }

    .reveal{
      opacity:0;
      transform: translateY(10px);
      transition: opacity .5s ease, transform .5s ease;
    }
    .reveal.on{
      opacity:1;
      transform: translateY(0);
    }

    @media (max-width: 980px){
      .hero-grid{grid-template-columns: 1fr; }
      .toc-grid{grid-template-columns: repeat(2, minmax(0, 1fr));}
      .grid-2{grid-template-columns: 1fr;}
      .foot-grid{grid-template-columns: 1fr;}
      .foot-links a{width:auto}
    }
    @media (max-width: 720px){
      .menu-btn{display:inline-flex; align-items:center; gap:10px}
      .menu{
        display:none;
      }
      header[data-menu="open"] .menu{
        display:flex;
        position:absolute;
        left:0; right:0;
        top: 62px;
        padding: 12px var(--pad) 14px;
        background: rgba(251,247,239,.92);
        border-bottom: 1px solid rgba(35,38,44,.08);
        flex-direction:column;
        align-items:stretch;
        gap: 8px;
      }
      header[data-menu="open"] .nav{padding-bottom: 6px;}
      header[data-menu="open"] .menu a{padding: 10px 12px}
      .toc-grid{grid-template-columns: 1fr;}
      .hero-card{padding: 16px;}
      .hero-side{padding: 14px;}
    }