:root{
      --bg:#f7f4ee;
      --surface:#ffffff;
      --surface-2:#fbfaf7;
      --line:#e7e1d7;
      --text:#25313f;
      --muted:#667381;
      --accent:#b46a2a;
      --accent-2:#f3e3d3;
      --shadow:0 16px 40px rgba(43, 55, 68, .08);
      --radius:20px;
      --max:1120px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(180,106,42,.10), transparent 24%),
        radial-gradient(circle at top right, rgba(56,95,122,.08), transparent 20%),
        linear-gradient(180deg, #fffdf9 0%, var(--bg) 100%);
      line-height:1.75;
    }
    a{color:inherit;text-decoration:none}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    header{
      position:sticky; top:0; z-index:10;
      backdrop-filter:saturate(180%) blur(10px);
      background:rgba(247,244,238,.84);
      border-bottom:1px solid rgba(231,225,215,.85);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between;
      min-height:72px; gap:16px;
    }
    .brand{
      display:flex; align-items:center; gap:12px; font-weight:700; letter-spacing:.02em;
    }
    .brand-mark{
      width:38px; height:38px; border-radius:12px;
      background:linear-gradient(135deg, var(--accent), #d89b62);
      box-shadow:0 10px 24px rgba(180,106,42,.25);
      flex:none;
    }
    .brand span{font-size:1.02rem}
    .nav-links{
      display:flex; gap:18px; flex-wrap:wrap; justify-content:flex-end;
      color:var(--muted); font-size:.95rem;
    }
    .nav-links a{padding:8px 0; transition:color .2s ease}
    .nav-links a:hover{color:var(--accent)}
    main{display:block}
    .hero{padding:42px 0 20px}
    .hero-grid{
      display:grid; grid-template-columns:1.25fr .75fr; gap:22px; align-items:start;
    }
    .hero-card,.info-card,.content-card,.aside-card,.related-card,footer{
      background:rgba(255,255,255,.82);
      border:1px solid rgba(231,225,215,.95);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-card{padding:28px}
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 12px; border-radius:999px;
      background:var(--accent-2); color:#8f541f; font-size:.92rem; font-weight:600;
    }
    h1,h2,h3{line-height:1.25; margin:0}
    h1{font-size:clamp(2rem, 4vw, 3.15rem); margin-top:16px}
    .lead{margin:16px 0 0; color:var(--muted); font-size:1.02rem; max-width:62ch}
    .hero-points{
      display:grid; grid-template-columns:repeat(3, minmax(0, 1fr)); gap:12px;
      margin-top:22px;
    }
    .point{
      padding:14px 14px 15px; border-radius:16px; background:var(--surface-2);
      border:1px solid var(--line);
    }
    .point strong{display:block; margin-bottom:6px; font-size:.98rem}
    .point span{color:var(--muted); font-size:.92rem}
    .aside-card{padding:22px}
    .aside-card h2{font-size:1.08rem}
    .aside-list{list-style:none; padding:0; margin:14px 0 0; display:grid; gap:12px}
    .aside-list li{
      padding:12px 14px; border-radius:14px; background:#fffaf3; border:1px solid #f0e2cf;
      color:#465261;
    }
    .section{padding:18px 0}
    .content-grid{
      display:grid; grid-template-columns:1fr 1fr; gap:22px; align-items:start;
    }
    .content-card{padding:24px}
    .content-card h2{font-size:1.42rem; margin-bottom:14px}
    .content-card p{margin:0; color:var(--text)}
    .note{
      margin-top:14px; padding:14px 16px; border-left:4px solid var(--accent);
      background:#fff9f2; border-radius:14px; color:#5a4632;
    }
    .steps{
      display:grid; gap:12px; margin-top:14px;
    }
    .step{
      display:flex; gap:14px; padding:15px 16px; border-radius:16px;
      background:var(--surface-2); border:1px solid var(--line);
    }
    .num{
      width:30px; height:30px; flex:none; border-radius:999px;
      display:grid; place-items:center; background:var(--accent); color:#fff; font-weight:700; font-size:.92rem;
    }
    .step h3{font-size:1rem; margin-bottom:4px}
    .step p{margin:0; color:var(--muted); font-size:.95rem}
    .compare{
      display:grid; grid-template-columns:1fr 1fr; gap:14px; margin-top:14px;
    }
    .compare .box{
      padding:16px; border-radius:16px; border:1px solid var(--line); background:#fffdf9;
    }
    .compare h3{font-size:1rem; margin-bottom:8px}
    .compare ul{margin:0; padding-left:18px; color:var(--muted)}
    .compare li{margin:6px 0}
    .faq{padding:18px 0 4px}
    .faq-grid{display:grid; gap:12px}
    details{
      background:rgba(255,255,255,.86);
      border:1px solid var(--line);
      border-radius:16px;
      box-shadow:0 8px 24px rgba(43, 55, 68, .05);
      overflow:hidden;
    }
    summary{
      list-style:none; cursor:pointer; padding:16px 18px; font-weight:600; position:relative;
    }
    summary::-webkit-details-marker{display:none}
    summary::after{
      content:"＋"; position:absolute; right:18px; top:50%; transform:translateY(-50%);
      color:var(--muted); font-weight:400;
    }
    details[open] summary::after{content:"－"}
    details .answer{padding:0 18px 16px; color:var(--muted)}
    .related{
      padding:18px 0 22px;
    }
    .related-card{padding:22px}
    .related-card h2{font-size:1.2rem; margin-bottom:12px}
    .related-grid{
      display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap:12px;
    }
    .related-grid a{
      display:block; padding:14px 14px 15px; border-radius:14px;
      border:1px solid var(--line); background:#fffdf9;
      color:var(--text); transition:transform .2s ease, border-color .2s ease, box-shadow .2s ease;
      min-height:72px;
    }
    .related-grid a:hover{
      transform:translateY(-2px);
      border-color:#d9bf9d;
      box-shadow:0 10px 24px rgba(180,106,42,.08);
    }
    .related-grid small{display:block; color:var(--muted); margin-top:6px}
    footer{
      margin:0 0 18px;
      padding:18px 22px;
      background:#f8f5ef;
      color:var(--muted);
      box-shadow:none;
    }
    .footer-row{
      display:flex; flex-wrap:wrap; justify-content:space-between; gap:12px; align-items:center;
      font-size:.92rem;
    }
    .footer-row strong{color:var(--text)}
    @media (max-width: 920px){
      .hero-grid,.content-grid,.related-grid,.hero-points,.compare{grid-template-columns:1fr}
      .nav{align-items:flex-start; padding:14px 0}
      .nav-links{justify-content:flex-start}
      .hero{padding-top:26px}
    }
    @media (max-width: 640px){
      .container{width:min(var(--max), calc(100% - 24px))}
      .hero-card,.content-card,.aside-card,.related-card{padding:18px}
      h1{font-size:clamp(1.7rem, 8vw, 2.35rem)}
      .lead{font-size:.98rem}
      .nav{min-height:auto; padding:14px 0}
      .brand-mark{width:34px; height:34px}
      .nav-links{gap:12px; font-size:.92rem}
      summary{padding:15px 16px}
      summary::after{right:16px}
    }
    .fade-up{animation:fadeUp .7s ease both}
    .delay-1{animation-delay:.08s}
    .delay-2{animation-delay:.16s}
    .delay-3{animation-delay:.24s}
    @keyframes fadeUp{
      from{opacity:0; transform:translateY(12px)}
      to{opacity:1; transform:translateY(0)}
    }