/* ======================================================================
   游泳配速换算表 · 独立设计（泳池水色渐变 + 泳道线 + 气泡）
   浅色 = 浅水蓝；深色 = 深水靛蓝
   ====================================================================== */
.sw{
  --ink:#0f2a38; --sub:#4d7285; --faint:#84a6b6;
  --bg:#e8f5f9; --card:#ffffff; --card2:#eef8fb; --line:#cfe6ee; --line2:#dceff5;
  --pri:#0891b2; --pri-2:#22d3ee; --pri-soft:#dff4f9; --pri-ink:#155e75;
  --wave:#0e7490; --deep:#164e63;
  --coral:#fb7185; --coral-soft:#ffe4e9;
  --red:#dc2626; --red-soft:#fdeaea;
  --r:18px;
  --shadow:0 1px 2px rgba(15,42,56,.05),0 12px 30px rgba(14,116,144,.10);
  color:var(--ink);
  font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:15px; line-height:1.75;
  background:
    linear-gradient(180deg, rgba(34,211,238,.10), transparent 220px),
    radial-gradient(700px 320px at 100% -80px, rgba(8,145,178,.10), transparent 60%),
    var(--bg);
  padding:0 16px 56px;
}
:root[data-theme="dark"] .sw{
  --ink:#d7eef5; --sub:#8fb6c6; --faint:#5d8496;
  --bg:#071a24; --card:#0d2532; --card2:#11303f; --line:#1d4256; --line2:#173a4c;
  --pri:#22d3ee; --pri-2:#67e8f9; --pri-soft:rgba(34,211,238,.12); --pri-ink:#a5f3fc;
  --wave:#0e7490; --deep:#083344;
  --coral:#fda4af; --coral-soft:rgba(251,113,133,.14);
  --red:#f87171; --red-soft:rgba(248,113,133,.14);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 32px rgba(0,0,0,.4);
}
.sw *{box-sizing:border-box;}
.sw b{font-weight:700;}
.sw-wrap{max-width:1120px;margin:0 auto;}
.sw input{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;}

.sw-hero{
  margin-top:22px;border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);
  background:linear-gradient(150deg,var(--wave),var(--deep));
  border:1px solid var(--deep);position:relative;
}
.sw-hero:before{content:"";position:absolute;inset:0;background:
  repeating-linear-gradient(90deg,transparent 0 108px,rgba(255,255,255,.14) 108px 110px);}
.sw-hero:after{content:"";position:absolute;left:0;right:0;bottom:0;height:46px;background:
  radial-gradient(18px 30px at 8% 100%, rgba(255,255,255,.18), transparent 70%),
  radial-gradient(14px 24px at 30% 100%, rgba(255,255,255,.14), transparent 70%),
  radial-gradient(20px 32px at 62% 100%, rgba(255,255,255,.16), transparent 70%),
  radial-gradient(12px 22px at 88% 100%, rgba(255,255,255,.14), transparent 70%);}
.sw-hero-in{padding:26px 28px 34px;position:relative;z-index:1;}
.sw-hero h1{margin:0 0 8px;font-size:clamp(24px,3.6vw,32px);font-weight:900;color:#f0fdff;line-height:1.3;}
.sw-hero p{margin:0;color:#a5d8e6;font-size:15px;max-width:780px;}
.sw-hero p em{font-style:normal;color:#67e8f9;font-weight:800;}

.sw-desk{display:grid;grid-template-columns:1fr 1.3fr;gap:18px;margin-top:20px;}
@media (max-width:920px){.sw-desk{grid-template-columns:1fr;}}
.sw-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;}
.sw-card h2{margin:0 0 10px;font-size:16px;font-weight:800;display:flex;align-items:center;gap:8px;}
.sw-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:6px 14px 6px 14px;background:var(--pri);color:#fff;font-size:12px;font-weight:800;}
:root[data-theme="dark"] .sw-num{color:#062430;}
.sw-tip{font-size:12.5px;color:var(--sub);margin:0 0 10px;}

.sw-seg{display:flex;gap:8px;margin-bottom:12px;}
.sw-segbtn{flex:1;border:1px solid var(--line);background:var(--card2);color:var(--sub);border-radius:10px;padding:7px 10px;font-size:13px;font-weight:700;cursor:pointer;}
.sw-segbtn.on{background:var(--pri);border-color:var(--pri);color:#fff;}
:root[data-theme="dark"] .sw-segbtn.on{color:#062430;}
.sw-field{display:flex;align-items:center;gap:8px;margin:10px 0;flex-wrap:wrap;}
.sw-field label{font-size:13.5px;color:var(--sub);min-width:86px;}
.sw-in{background:var(--card2);border:1px solid var(--line);border-radius:9px;color:var(--ink);padding:7px 10px;font-size:14px;width:88px;outline:none;}
.sw-in:focus{border-color:var(--pri-2);box-shadow:0 0 0 3px var(--pri-soft);}
.sw-unit{font-size:13px;color:var(--faint);}
.sw-pool{display:flex;gap:8px;}
.sw-pool button{border:1px solid var(--line);background:var(--card2);color:var(--sub);border-radius:999px;padding:5px 16px;font-size:13px;font-weight:700;cursor:pointer;}
.sw-pool button.on{background:var(--pri-soft);border-color:var(--pri);color:var(--pri-ink);}
.sw-btn{border:none;border-radius:10px;padding:8px 16px;font-size:13.5px;font-weight:800;cursor:pointer;transition:all .15s;}
.sw-btn-go{background:var(--pri);color:#fff;}
.sw-btn-go:hover{background:var(--pri-2);}
.sw-btn-ghost{background:var(--card2);color:var(--pri-ink);border:1px solid var(--line);}
.sw-btn-ghost:hover{border-color:var(--pri-2);}
.sw-rowbtns{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;}
.sw-msg{margin-top:10px;font-size:13px;min-height:20px;font-weight:600;}
.sw-msg.err{color:var(--red);}
.sw-msg.ok{color:var(--pri);}

.sw-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:12px;}
@media (max-width:560px){.sw-stats{grid-template-columns:1fr 1fr;}}
.sw-stat{background:var(--card2);border:1px solid var(--line2);border-radius:12px;padding:10px 12px;text-align:center;}
.sw-stat .v{font-size:22px;font-weight:900;color:var(--pri-ink);font-family:ui-monospace,Consolas,monospace;}
.sw-stat .k{font-size:12px;color:var(--sub);margin-top:2px;}
.sw-stat.hot{background:var(--pri-soft);border-color:var(--pri);}
.sw-lvl{display:inline-block;border-radius:999px;padding:3px 12px;font-size:12.5px;font-weight:800;background:var(--coral-soft);color:var(--coral);}

.sw-table{width:100%;border-collapse:collapse;font-size:13.5px;}
.sw-table th,.sw-table td{border:1px solid var(--line);padding:6px 10px;text-align:center;}
.sw-table th{background:var(--card2);font-weight:700;}
.sw-table td.t{font-family:ui-monospace,Consolas,monospace;color:var(--pri-ink);font-weight:700;}
.sw-ref{margin-top:18px;display:grid;grid-template-columns:1fr 1fr;gap:18px;}
@media (max-width:920px){.sw-ref{grid-template-columns:1fr;}}
.sw-note{font-size:13px;color:var(--sub);margin:10px 0 0;}
.sw-note b{color:var(--ink);}

.sw-faq{margin-top:34px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;box-shadow:var(--shadow);}
.sw-faq h2{margin:0 0 12px;font-size:19px;font-weight:900;}
.sw-faq h3{margin:18px 0 6px;font-size:15.5px;font-weight:800;color:var(--pri-ink);}
.sw-faq p{margin:0;color:var(--sub);font-size:14px;}
.sw-faq p b{color:var(--ink);}