:root{
      --bg: #f6fbf9;
      --paper: #ffffff;
      --ink: #1f2a2e;
      --muted: #5b6b72;
      --line: rgba(15, 23, 42, .10);
      --shadow: 0 12px 30px rgba(17, 24, 39, .10);
      --shadow2: 0 10px 22px rgba(17, 24, 39, .08);
      --mint: #16a34a;
      --sea: #0ea5e9;
      --ice: #38bdf8;
      --teal: #0f766e;
      --salty: #0ea5a5;
      --accent: #0ea5a5;
      --accent2: #0ea5e9;
      --warn: #f59e0b;
      --danger: #ef4444;
      --radius: 18px;
      --radius2: 14px;
      --container: 1120px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB",
                   "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
      color: var(--ink);
      background:
        radial-gradient(1000px 420px at 12% -10%, rgba(56, 189, 248, .24), transparent 55%),
        radial-gradient(850px 380px at 88% 2%, rgba(14, 165, 165, .18), transparent 50%),
        radial-gradient(820px 360px at 50% 16%, rgba(22, 163, 74, .10), transparent 55%),
        linear-gradient(180deg, #f2fbf8 0%, var(--bg) 38%, #f7fbff 100%);
    }
    a{color:inherit}
    .container{
      width: min(var(--container), calc(100% - 32px));
      margin: 0 auto;
    }
    .topbar{
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(246, 251, 249, .72);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(15, 23, 42, .08);
    }
    .topbar-inner{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap: 14px;
      padding: 12px 0;
    }
    .brand{
      display:flex;
      align-items:center;
      gap: 10px;
      min-width: 120px;
    }
    .logo{
      width: 40px;
      height: 40px;
      border-radius: 14px;
      background:
        radial-gradient(18px 18px at 30% 28%, rgba(255,255,255,.9), rgba(255,255,255,0) 60%),
        linear-gradient(135deg, rgba(56, 189, 248, .95), rgba(14, 165, 165, .95));
      box-shadow: 0 10px 22px rgba(14,165,165,.18);
      display:flex;
      align-items:center;
      justify-content:center;
      color: #07313a;
      font-weight: 900;
      letter-spacing: .02em;
      user-select:none;
    }
    .brand-name{
      display:flex;
      flex-direction:column;
      line-height:1.05;
    }
    .brand-name strong{
      font-size: 14px;
      letter-spacing: .02em;
    }
    .brand-name span{
      font-size: 12px;
      color: var(--muted);
    }
    .nav{
      display:flex;
      align-items:center;
      gap: 18px;
    }
    .nav a{
      text-decoration:none;
      font-size: 14px;
      color: rgba(31, 42, 46, .92);
      padding: 10px 10px;
      border-radius: 12px;
      border: 1px solid transparent;
      transition: transform .15s ease, background .15s ease, border-color .15s ease;
      white-space:nowrap;
    }
    .nav a:hover{
      transform: translateY(-1px);
      background: rgba(255,255,255,.6);
      border-color: rgba(14,165,165,.20);
    }
    .cta{
      display:flex;
      align-items:center;
      gap: 10px;
      justify-content:flex-end;
      min-width: 170px;
    }
    .btn{
      appearance:none;
      border: 1px solid rgba(14,165,165,.25);
      background: rgba(255,255,255,.75);
      color: #0b3b40;
      padding: 10px 14px;
      border-radius: 14px;
      font-weight: 700;
      font-size: 14px;
      cursor:pointer;
      transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
      text-decoration:none;
      display:inline-flex;
      align-items:center;
      gap: 8px;
      white-space:nowrap;
    }
    .btn:hover{
      transform: translateY(-1px);
      box-shadow: 0 10px 18px rgba(14,165,165,.16);
      border-color: rgba(14,165,165,.38);
      background: rgba(255,255,255,.95);
    }
    .btn-primary{
      border-color: rgba(14,165,165,.35);
      background: linear-gradient(135deg, rgba(56, 189, 248, .95), rgba(14, 165, 165, .95));
      color: #062b2f;
      box-shadow: 0 12px 26px rgba(14,165,165,.18);
    }
    .btn-primary:hover{
      box-shadow: 0 16px 30px rgba(14,165,165,.22);
      border-color: rgba(255,255,255,.40);
      background: linear-gradient(135deg, rgba(56, 189, 248, 1), rgba(14, 165, 165, 1));
    }
    .btn .dot{
      width: 9px; height: 9px; border-radius: 50%;
      background: rgba(6,43,47,.35);
      box-shadow: inset 0 0 0 2px rgba(255,255,255,.35);
    }
    .menu-btn{
      display:none;
      width: 44px; height: 44px;
      border-radius: 14px;
      border: 1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.70);
      cursor:pointer;
      transition: transform .15s ease, background .15s ease;
    }
    .menu-btn:hover{transform: translateY(-1px); background: rgba(255,255,255,.95)}
    .menu-icon{
      width: 18px; height: 14px;
      margin: 0 auto;
      position: relative;
    }
    .menu-icon span{
      position:absolute; left:0; right:0;
      height: 2px;
      background: rgba(31,42,46,.85);
      border-radius: 2px;
      transition: transform .2s ease, top .2s ease, opacity .2s ease;
    }
    .menu-icon span:nth-child(1){top:0}
    .menu-icon span:nth-child(2){top:6px}
    .menu-icon span:nth-child(3){top:12px}
    .menu-btn[aria-expanded="true"] .menu-icon span:nth-child(1){top:6px; transform: rotate(45deg)}
    .menu-btn[aria-expanded="true"] .menu-icon span:nth-child(2){opacity:0}
    .menu-btn[aria-expanded="true"] .menu-icon span:nth-child(3){top:6px; transform: rotate(-45deg)}
    .mobile-panel{
      display:none;
      padding: 6px 0 14px;
    }
    .mobile-panel .mobile-nav{
      display:flex;
      flex-direction:column;
      gap: 8px;
      padding: 10px;
      border-radius: 16px;
      border: 1px solid rgba(15,23,42,.08);
      background: rgba(255,255,255,.70);
      box-shadow: 0 10px 22px rgba(17,24,39,.08);
    }
    .mobile-panel .mobile-nav a{
      text-decoration:none;
      padding: 12px 12px;
      border-radius: 14px;
      border: 1px solid rgba(15,23,42,.06);
      background: rgba(255,255,255,.65);
      font-weight: 650;
      transition: transform .15s ease, background .15s ease;
    }
    .mobile-panel .mobile-nav a:hover{
      transform: translateY(-1px);
      background: rgba(255,255,255,.95);
    }

    header.hero{
      padding: 22px 0 8px;
    }
    .hero-grid{
      display:grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 18px;
      align-items: stretch;
    }
    .hero-card{
      border-radius: var(--radius);
      border: 1px solid rgba(15,23,42,.10);
      background:
        radial-gradient(900px 280px at 14% -10%, rgba(56,189,248,.25), transparent 55%),
        radial-gradient(700px 240px at 90% 0%, rgba(14,165,165,.20), transparent 55%),
        linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.68));
      box-shadow: var(--shadow2);
      padding: 18px;
      position: relative;
      overflow: hidden;
    }
    .hero-card::after{
      content:"";
      position:absolute;
      width: 540px; height: 540px;
      right: -300px; top: -340px;
      background: radial-gradient(circle at 30% 30%, rgba(56,189,248,.35), transparent 55%);
      filter: blur(2px);
      pointer-events:none;
      opacity: .9;
      transform: translateZ(0);
    }
    .pill-row{
      display:flex;
      flex-wrap:wrap;
      gap: 10px;
      margin-bottom: 10px;
      position:relative;
      z-index:1;
    }
    .pill{
      display:inline-flex;
      align-items:center;
      gap: 8px;
      padding: 9px 12px;
      border-radius: 999px;
      border: 1px solid rgba(14,165,165,.20);
      background: rgba(255,255,255,.65);
      font-weight: 650;
      font-size: 13px;
      color: rgba(11,59,64,.95);
    }
    .pill i{
      width: 10px; height: 10px; border-radius: 50%;
      background: linear-gradient(135deg, rgba(56,189,248,1), rgba(14,165,165,1));
      box-shadow: 0 10px 18px rgba(14,165,165,.18);
      display:inline-block;
    }
    h1{
      margin: 0;
      font-size: 30px;
      letter-spacing: -0.02em;
      line-height: 1.12;
      position:relative;
      z-index:1;
    }
    .hero-sub{
      margin-top: 10px;
      color: var(--muted);
      font-size: 14px;
      line-height: 1.6;
      position:relative;
      z-index:1;
      max-width: 66ch;
    }
    .hero-actions{
      margin-top: 14px;
      display:flex;
      gap: 10px;
      flex-wrap: wrap;
      align-items:center;
      position:relative;
      z-index:1;
    }
    .hero-note{
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px dashed rgba(15,23,42,.14);
      display:flex;
      gap: 12px;
      align-items:flex-start;
      position:relative;
      z-index:1;
    }
    .hero-note .badge{
      flex: 0 0 auto;
      width: 36px; height: 36px;
      border-radius: 14px;
      background: rgba(14,165,165,.14);
      border: 1px solid rgba(14,165,165,.22);
      display:flex; align-items:center; justify-content:center;
      font-weight: 900;
      color: #0b3b40;
    }
    .hero-note p{
      margin: 0;
      color: rgba(31,42,46,.88);
      font-size: 13px;
      line-height: 1.55;
    }

    .side-card{
      border-radius: var(--radius);
      border: 1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.72);
      box-shadow: var(--shadow2);
      padding: 16px;
      display:flex;
      flex-direction:column;
      gap: 12px;
      position: relative;
      overflow:hidden;
    }
    .side-card::before{
      content:"";
      position:absolute;
      inset:-2px;
      background:
        radial-gradient(260px 220px at 18% 10%, rgba(56,189,248,.22), transparent 60%),
        radial-gradient(240px 210px at 82% 0%, rgba(14,165,165,.18), transparent 60%);
      pointer-events:none;
      opacity:.9;
    }
    .side-card > *{position:relative; z-index:1}
    .side-title{
      display:flex; align-items:center; justify-content:space-between; gap: 10px;
    }
    .side-title h2{
      margin:0;
      font-size: 16px;
      letter-spacing: -0.01em;
    }
    .chip{
      font-size: 12px;
      color: #0b3b40;
      background: rgba(56,189,248,.16);
      border: 1px solid rgba(56,189,248,.26);
      padding: 6px 10px;
      border-radius: 999px;
      font-weight: 700;
      white-space:nowrap;
    }
    .img-stack{
      display:grid;
      grid-template-columns: 1fr;
      gap: 10px;
    }
    .img-box{
      border-radius: 16px;
      border: 1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.66);
      padding: 10px;
    }
    .img-box .frame{
      border-radius: 14px;
      overflow:hidden;
      background: linear-gradient(180deg, rgba(255,255,255,.65), rgba(255,255,255,.35));
      border: 1px solid rgba(15,23,42,.08);
    }
    .img-box img{
      width:100%;
      height:auto;
      display:block;
      transform: scale(1.001);
    }
    .side-list{
      display:grid;
      gap: 8px;
      padding: 0;
      margin:0;
      list-style:none;
    }
    .side-list li{
      display:flex;
      align-items:flex-start;
      gap: 10px;
      padding: 10px 10px;
      border-radius: 14px;
      border: 1px solid rgba(15,23,42,.07);
      background: rgba(255,255,255,.60);
      transition: transform .15s ease, background .15s ease, border-color .15s ease;
    }
    .side-list li:hover{
      transform: translateY(-1px);
      background: rgba(255,255,255,.92);
      border-color: rgba(14,165,165,.22);
    }
    .side-list .bullet{
      width: 10px; height: 10px; border-radius: 50%;
      background: linear-gradient(135deg, rgba(56,189,248,1), rgba(14,165,165,1));
      margin-top: 5px;
      flex: 0 0 auto;
    }
    .side-list strong{
      font-size: 13px;
      display:block;
      margin-bottom: 2px;
    }
    .side-list span{
      font-size: 12px;
      color: var(--muted);
      line-height:1.45;
      display:block;
    }

    .section{
      padding: 12px 0;
    }
    .section-head{
      display:flex;
      align-items:flex-end;
      justify-content:space-between;
      gap: 14px;
      margin: 18px 0 10px;
    }
    .section-head h2{
      margin:0;
      font-size: 20px;
      letter-spacing: -0.01em;
    }
    .section-head p{
      margin:0;
      color: var(--muted);
      font-size: 13px;
      line-height:1.4;
      max-width: 60ch;
    }

    .grid-2{
      display:grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      align-items:stretch;
    }
    .grid-3{
      display:grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      align-items:stretch;
    }

    .card{
      border-radius: var(--radius);
      border: 1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.72);
      box-shadow: 0 10px 20px rgba(17,24,39,.06);
      padding: 16px;
      transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
    }
    .card:hover{
      transform: translateY(-2px);
      box-shadow: 0 18px 32px rgba(17,24,39,.10);
      border-color: rgba(14,165,165,.26);
      background: rgba(255,255,255,.90);
    }
    .card h3{
      margin: 0 0 8px;
      font-size: 16px;
      letter-spacing: -0.01em;
    }
    .card p{
      margin: 0;
      color: rgba(31,42,46,.86);
      font-size: 13px;
      line-height: 1.7;
    }
    .steps{
      display:grid;
      gap: 10px;
    }
    .step{
      border-radius: 16px;
      border: 1px solid rgba(15,23,42,.08);
      background: rgba(255,255,255,.62);
      padding: 12px 12px;
      display:flex;
      gap: 12px;
      align-items:flex-start;
    }
    .step .n{
      width: 30px; height: 30px;
      border-radius: 12px;
      background: rgba(14,165,165,.14);
      border: 1px solid rgba(14,165,165,.22);
      display:flex; align-items:center; justify-content:center;
      font-weight: 900;
      color: #0b3b40;
      flex: 0 0 auto;
    }
    .step strong{
      display:block;
      margin-bottom: 3px;
      font-size: 13px;
    }
    .step span{
      color: var(--muted);
      font-size: 12px;
      line-height: 1.55;
    }

    .toc{
      border-radius: var(--radius);
      border: 1px solid rgba(15,23,42,.10);
      background: linear-gradient(180deg, rgba(255,255,255,.80), rgba(255,255,255,.62));
      box-shadow: 0 10px 20px rgba(17,24,39,.06);
      padding: 14px;
    }
    .toc h2{
      margin:0 0 8px;
      font-size: 16px;
    }
    .toc a{
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap: 12px;
      text-decoration:none;
      padding: 10px 12px;
      border-radius: 14px;
      border: 1px solid rgba(15,23,42,.07);
      background: rgba(255,255,255,.62);
      margin-top: 8px;
      transition: transform .15s ease, background .15s ease, border-color .15s ease;
      font-weight: 700;
      color: rgba(31,42,46,.94);
    }
    .toc a:hover{
      transform: translateY(-1px);
      background: rgba(255,255,255,.95);
      border-color: rgba(14,165,165,.22);
    }
    .toc a .arrow{
      width: 28px; height: 28px; border-radius: 12px;
      border: 1px solid rgba(14,165,165,.20);
      background: rgba(14,165,165,.10);
      display:flex; align-items:center; justify-content:center;
      font-weight: 900;
      color: #0b3b40;
      flex: 0 0 auto;
    }

    .list{
      margin: 0; padding-left: 18px;
      color: rgba(31,42,46,.88);
      font-size: 13px;
      line-height: 1.7;
    }
    .list li{margin: 6px 0}
    .faq{
      display:grid;
      gap: 10px;
    }
    details{
      border-radius: 16px;
      border: 1px solid rgba(15,23,42,.08);
      background: rgba(255,255,255,.62);
      padding: 12px 12px;
      transition: background .15s ease, border-color .15s ease, transform .15s ease;
    }
    details[open]{
      background: rgba(255,255,255,.92);
      border-color: rgba(14,165,165,.24);
      box-shadow: 0 16px 30px rgba(17,24,39,.10);
      transform: translateY(-1px);
    }
    summary{
      cursor:pointer;
      list-style:none;
      font-weight: 850;
      font-size: 14px;
      color: rgba(31,42,46,.98);
      display:flex;
      align-items:flex-start;
      justify-content:space-between;
      gap: 12px;
    }
    summary::-webkit-details-marker{display:none}
    .sum-right{
      color: rgba(11,59,64,.88);
      font-weight: 900;
      flex: 0 0 auto;
      opacity:.9;
      margin-top: 1px;
    }
    details p{
      margin: 10px 0 0;
      color: var(--muted);
      font-size: 13px;
      line-height: 1.75;
    }

    .end{
      display:flex;
      align-items:flex-start;
      justify-content:space-between;
      gap: 14px;
      margin-top: 12px;
      border-radius: var(--radius);
      border: 1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.70);
      box-shadow: 0 10px 20px rgba(17,24,39,.06);
      padding: 16px;
    }
    .end .left h2{margin:0 0 8px; font-size: 18px}
    .end .left p{margin:0; color: var(--muted); font-size: 13px; line-height: 1.7}
    .end .right{
      display:flex;
      flex-direction:column;
      gap: 10px;
      align-items:flex-end;
      min-width: 210px;
    }
    .links{
      display:flex;
      flex-wrap:wrap;
      gap: 10px;
      justify-content:flex-end;
    }
    .link-chip{
      text-decoration:none;
      font-size: 13px;
      font-weight: 750;
      color: rgba(11,59,64,.95);
      border: 1px solid rgba(14,165,165,.22);
      background: rgba(255,255,255,.62);
      padding: 10px 12px;
      border-radius: 999px;
      transition: transform .15s ease, background .15s ease, border-color .15s ease;
      white-space:nowrap;
    }
    .link-chip:hover{
      transform: translateY(-1px);
      background: rgba(255,255,255,.95);
      border-color: rgba(14,165,165,.30);
    }

    footer{
      margin-top: 10px;
      background: linear-gradient(180deg, rgba(255,255,255,.30), rgba(255,255,255,.15));
      border-top: 1px solid rgba(15,23,42,.10);
    }
    .footer-inner{
      padding: 18px 0 16px;
      display:flex;
      align-items:flex-start;
      justify-content:space-between;
      gap: 14px;
      flex-wrap:wrap;
    }
    .footer-inner .f-left{
      min-width: 240px;
    }
    .f-title{
      display:flex;
      align-items:center;
      gap: 10px;
      margin-bottom: 6px;
    }
    .f-title .logo-mini{
      width: 34px; height: 34px;
      border-radius: 13px;
      background:
        radial-gradient(14px 14px at 30% 28%, rgba(255,255,255,.9), rgba(255,255,255,0) 60%),
        linear-gradient(135deg, rgba(56, 189, 248, .95), rgba(14, 165, 165, .95));
      display:flex; align-items:center; justify-content:center;
      font-weight: 900;
      color: #07313a;
    }
    footer strong{
      font-size: 14px;
    }
    .copyright{
      color: rgba(31,42,46,.72);
      font-size: 12px;
      line-height: 1.6;
      margin: 0;
    }
    .f-right{
      min-width: 260px;
      display:flex;
      flex-direction:column;
      gap: 10px;
      align-items:flex-end;
    }
    .kv{
      display:grid;
      grid-template-columns: 1fr;
      gap: 6px;
      width: 100%;
      max-width: 440px;
    }
    .kv .row{
      display:flex;
      gap: 10px;
      justify-content:flex-end;
      flex-wrap:wrap;
    }
    .kv .tag{
      font-size: 12px;
      color: rgba(31,42,46,.78);
      border: 1px solid rgba(15,23,42,.10);
      background: rgba(255,255,255,.55);
      padding: 8px 10px;
      border-radius: 999px;
      font-weight: 700;
    }

    .sr-only{
      position:absolute !important;
      width:1px; height:1px;
      padding:0; margin:-1px;
      overflow:hidden; clip:rect(0,0,0,0);
      white-space:nowrap; border:0;
    }

    .reveal{
      opacity:0;
      transform: translateY(10px);
      transition: opacity .35s ease, transform .35s ease;
    }
    .reveal.show{
      opacity:1;
      transform: translateY(0);
    }
    @media (prefers-reduced-motion: reduce){
      html{scroll-behavior:auto}
      .reveal{transition:none; transform:none}
      .card, .btn, .toc a, details{transition:none}
    }

    @media (max-width: 920px){
      .hero-grid{grid-template-columns: 1fr; }
      .cta{min-width: unset}
      .grid-2{grid-template-columns: 1fr}
      .grid-3{grid-template-columns: 1fr}
      .end{flex-direction:column}
      .end .right{align-items:flex-start; min-width: unset}
      .links{justify-content:flex-start}
    }
    @media (max-width: 760px){
      .nav{display:none}
      .cta{display:none}
      .menu-btn{display:inline-flex; align-items:center; justify-content:center}
      .mobile-panel{display:block}
      .mobile-panel[hidden]{display:none}
    }