:root{
    --deep:#071925;
    --deep2:#0c2b3d;
    --panel:#0f3549;
    --gold:#e8b64f;
    --gold-dim:#a8813a;
    --cyan:#5fd6e3;
    --foam:#dff3f5;
    --ink:#c9dce2;
    --line:rgba(95,214,227,0.18);
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:
      radial-gradient(ellipse at 20% -10%, rgba(95,214,227,0.10), transparent 45%),
      radial-gradient(ellipse at 90% 10%, rgba(232,182,79,0.08), transparent 40%),
      linear-gradient(180deg, var(--deep) 0%, var(--deep2) 55%, #051520 100%);
    color:var(--ink);
    font-family: "PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,sans-serif;
    line-height:1.75;
    min-height:100vh;
  }
  .display{
    font-family: "Impact","Arial Black","PingFang SC",sans-serif;
    letter-spacing:0.02em;
  }
  a{color:var(--cyan);}

  /* bubbles ambient */
  .bubbles{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:0;opacity:0.35;}
  .bubble{position:absolute;bottom:-40px;border-radius:50%;border:1px solid rgba(95,214,227,0.4);background:radial-gradient(circle at 30% 30%, rgba(223,243,245,0.25), rgba(95,214,227,0.02));
    animation: rise linear infinite;}
  @keyframes rise{ to{ transform:translateY(-120vh); } }

  header{
    position:relative;z-index:1;
    max-width:920px;margin:0 auto;padding:64px 24px 40px;
    text-align:center;
  }
  .eyebrow{
    display:inline-block;color:var(--gold);font-size:13px;letter-spacing:0.3em;
    border:1px solid var(--gold-dim);padding:6px 16px;border-radius:2px;margin-bottom:24px;
  }
  h1{
    font-size:clamp(32px,5.5vw,54px);
    color:var(--foam);
    text-shadow:0 0 24px rgba(95,214,227,0.35);
    margin-bottom:18px;
  }
  header p.lead{color:var(--ink);font-size:17px;max-width:620px;margin:0 auto;opacity:0.85;}

  .hero-art{max-width:820px;margin:0 auto;padding:0 24px;position:relative;z-index:1;}
  .hero-art svg{width:100%;height:auto;display:block;border-radius:14px;}

  .fish-gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0;}
  @media (max-width:600px){.fish-gallery{grid-template-columns:1fr;}}
  .fish-gallery figure{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;text-align:center;margin:0;}
  .fish-gallery svg{width:100%;height:70px;}
  .fish-gallery figcaption{margin-top:10px;font-size:13.5px;color:var(--ink);}
  .fish-gallery figcaption b{display:block;color:var(--gold);font-size:14px;margin-bottom:2px;}

  .cannon-icon{width:44px;height:44px;flex:none;}
  .card.with-icon{display:flex;gap:14px;align-items:flex-start;}

  nav.toc{
    position:relative;z-index:1;
    max-width:920px;margin:0 auto 20px;padding:0 24px;
    display:flex;flex-wrap:wrap;gap:10px;justify-content:center;
  }
  nav.toc a{
    font-size:13px;color:var(--ink);text-decoration:none;
    border:1px solid var(--line);padding:8px 14px;border-radius:20px;
    transition:all .2s;
  }
  nav.toc a:hover{border-color:var(--cyan);color:var(--cyan);}

  main{position:relative;z-index:1;max-width:820px;margin:0 auto;padding:20px 24px 80px;}

  section{margin-top:56px;}
  section h2{
    font-size:26px;color:var(--foam);margin-bottom:6px;
    display:flex;align-items:baseline;gap:12px;
  }
  section h2 .num{color:var(--gold);font-size:15px;font-family:"Courier New",monospace;letter-spacing:0.1em;}
  section .rule{height:1px;background:linear-gradient(90deg,var(--gold-dim),transparent);margin:14px 0 22px;}
  section p{margin-bottom:14px;color:var(--ink);}
  section h3{color:var(--cyan);font-size:18px;margin:22px 0 10px;}

  .grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:18px 0;}
  @media (max-width:600px){.grid{grid-template-columns:1fr;}}
  .card{
    background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:18px 20px;
  }
  .card .tag{color:var(--gold);font-size:13px;letter-spacing:0.05em;margin-bottom:6px;display:block;}
  .card p{margin:0;font-size:14.5px;}

  table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;}
  th,td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;}
  th{color:var(--gold);font-weight:600;}
  tr:hover td{background:rgba(95,214,227,0.04);}

  .callout{
    border-left:3px solid var(--gold);background:rgba(232,182,79,0.06);
    padding:14px 18px;border-radius:0 8px 8px 0;margin:18px 0;font-size:14.5px;
  }

  .faq-item{border-bottom:1px solid var(--line);padding:18px 0;}
  .faq-item h3{margin-top:0;}
  .faq-item p{color:var(--ink);opacity:0.9;}

  footer{
    position:relative;z-index:1;text-align:center;padding:40px 24px 60px;
    color:rgba(201,220,226,0.5);font-size:13px;border-top:1px solid var(--line);
    max-width:820px;margin:0 auto;
  }
  footer p{margin-bottom:6px;}