:root{
      --primary:#2563eb;
      --text:#0f172a;
      --muted:#64748b;
      --bg:#f6f7fb;
      --card:#ffffff;
      --border: rgba(2,6,23,.08);
      --shadow: 0 12px 28px rgba(0,0,0,.07);
    }
    body{
      margin:0;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background: var(--bg);
      color: var(--text);
    }
    .wrap{
      max-width: 1100px;
      margin: 0 auto;
      padding: 22px 16px 96px;
    }
    }

    .page-title{
      font-weight: 900;
      letter-spacing: .2px;
      font-size: 1.6rem;
      margin: 0 0 6px;
    }
    .page-subtitle{
      color: var(--muted);
      margin: 0 0 16px;
      font-size: 1rem;
      line-height: 1.5;
    }

    .callout{
      background: rgba(37,99,235,.08);
      border: 1px solid rgba(37,99,235,.22);
      border-radius: 14px;
      padding: 12px 14px;
      display:flex;
      gap: 10px;
      align-items:flex-start;
      margin-bottom: 16px;
    }
    .callout .dot{
      width: 26px; height: 26px;
      border-radius: 8px;
      background: rgba(37,99,235,.18);
      display:flex; align-items:center; justify-content:center;
      color: var(--primary);
      font-weight: 900;
      flex: 0 0 auto;
    }
    .callout b{ color:#0b1220; }

    .step{
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 16px;
      box-shadow: var(--shadow);
      overflow: hidden;
      margin-bottom: 14px;
    }
    .step-head{
      padding: 14px 16px;
      border-bottom: 1px solid var(--border);
      display:flex;
      gap: 12px;
      align-items:flex-start;
    }
    .badge-num{
      width: 36px; height: 36px;
      border-radius: 12px;
      background: rgba(37,99,235,.12);
      color: var(--primary);
      font-weight: 900;
      display:flex;
      align-items:center;
      justify-content:center;
      flex: 0 0 auto;
    }
    .step-title{
      margin: 0;
      font-weight: 900;
      font-size: 1.1rem;
      line-height: 1.25;
    }
    .step-desc{
      margin: 6px 0 0;
      color: var(--muted);
      font-size: .98rem;
      line-height: 1.55;
    }

    .do{
      margin-top: 10px;
      display:inline-flex;
      align-items:center;
      gap: 8px;
      background: rgba(2,6,23,.04);
      border: 1px solid rgba(2,6,23,.06);
      padding: 8px 10px;
      border-radius: 12px;
      color:#0b1220;
      font-weight: 700;
      font-size: .95rem;
    }
    .do .tag{
      color: var(--primary);
      font-weight: 900;
    }

    .step-body{
      padding: 14px 16px 16px;
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 14px;
      align-items: start;
    }

    .shot{
      width: 100%;
      border-radius: 14px;
      border: 1px solid rgba(2,6,23,.10);
      background: #fff;
      display:block;
      cursor: zoom-in;
    }

    .mini-note{
      margin-top: 10px;
      color: var(--muted);
      font-size: .92rem;
      line-height: 1.6;
    }

    @media (max-width: 768px){
      .page-title{ font-size: 1.35rem; }
      .page-subtitle{ font-size: 1rem; }
      .step-body{ grid-template-columns: 1fr; }
      .step-title{ font-size: 1.05rem; }
      .step-desc{ font-size: 1rem; }
      .shot{
        max-height: 420px;
        object-fit: contain;
      }
    }

    .lightbox{
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,.78);
      display:none;
      align-items:center;
      justify-content:center;
      padding: 18px;
      z-index: 99999;
    }
    .lightbox.open{ display:flex; }
    .lightbox img{
      max-width: 92vw;
      max-height: 92vh;
      border-radius: 16px;
      border: 1px solid rgba(255,255,255,.15);
      box-shadow: 0 18px 60px rgba(0,0,0,.5);
      cursor: zoom-out;
    }
    .lb-tip{
      position: fixed;
      top: 12px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(255,255,255,.12);
      border: 1px solid rgba(255,255,255,.18);
      color: #fff;
      padding: 8px 12px;
      border-radius: 999px;
      font-size: .9rem;
      backdrop-filter: blur(6px);
      display:none;
      z-index: 100000;
    }
    .lightbox.open + .lb-tip{ display:block; }

    .footer{
      margin-top: 14px;
      color: var(--muted);
      font-size: .92rem;
      text-align:center;
    }