/* ======================================================================
   天线电长度计算器 · 独立设计（电波传播 / 频段标尺主题）
   浅色 = 晴空蓝 + 信号橙；深色 = 夜空蓝 + 亮橙
   ====================================================================== */
.ant{
  --ink:#0f2438; --sub:#4d6b86; --faint:#8aa4bc;
  --bg:#eef5fb; --card:#ffffff; --card2:#e5eff8; --line:#d2e2ef; --line2:#e0ecf6;
  --pri:#0369a1; --pri-2:#0ea5e9; --pri-soft:#e0f1fb; --pri-ink:#075985;
  --org:#ea580c; --org-2:#fb923c; --org-soft:#fdeee0;
  --red:#b42323; --red-soft:#fdecec;
  --r:14px;
  --shadow:0 1px 2px rgba(15,36,56,.06),0 10px 28px rgba(15,36,56,.08);
  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:
    radial-gradient(900px 420px at 85% -140px, rgba(14,165,233,.12), transparent 60%),
    radial-gradient(620px 320px at -6% 150px, rgba(234,88,12,.06), transparent 60%),
    var(--bg);
  padding:0 16px 56px;
}
:root[data-theme="dark"] .ant{
  --ink:#dceaf6; --sub:#94b2ca; --faint:#5d7d97;
  --bg:#0a1420; --card:#101d2c; --card2:#152638; --line:#24405c; --line2:#1d3550;
  --pri:#38bdf8; --pri-2:#7dd3fc; --pri-soft:rgba(56,189,248,.12); --pri-ink:#bae6fd;
  --org:#fb923c; --org-2:#fdba74; --org-soft:rgba(251,146,60,.12);
  --red:#f87171; --red-soft:rgba(248,113,113,.12);
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 32px rgba(0,0,0,.4);
}
.ant *{box-sizing:border-box;}
.ant b{font-weight:700;}
.ant-wrap{max-width:1120px;margin:0 auto;}
.ant input,.ant pre,.ant .ant-mono{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Consolas,"Courier New",monospace;}

/* ---------- 首屏：波形 ---------- */
.ant-hero{margin-top:22px;border-radius:18px;background:var(--card);border:1px solid var(--line);box-shadow:var(--shadow);overflow:hidden;}
.ant-hero-body{padding:26px 28px 18px;}
.ant-kicker{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:800;letter-spacing:.12em;color:var(--pri-ink);background:var(--pri-soft);border:1px solid var(--pri);border-radius:999px;padding:4px 14px;}
.ant-hero h1{margin:12px 0 8px;font-size:clamp(24px,3.6vw,32px);font-weight:900;line-height:1.3;}
.ant-hero p{margin:0;color:var(--sub);font-size:15px;max-width:720px;}
.ant-hero p em{font-style:normal;color:var(--org);font-weight:800;}
.ant-hero p i{font-style:normal;color:var(--pri-ink);font-weight:800;}
.ant-wave{display:block;width:100%;height:74px;}
.ant-wave .w{stroke:var(--pri-2);stroke-width:3;fill:none;stroke-linecap:round;}
.ant-wave .w2{stroke:var(--org);stroke-width:2.4;fill:none;stroke-linecap:round;opacity:.55;}
.ant-wave .lam{stroke:var(--org);stroke-width:1.6;stroke-dasharray:4 4;}
.ant-wave text{fill:var(--org);font-size:13px;font-weight:800;}

/* ---------- 工作台 ---------- */
.ant-desk{display:grid;grid-template-columns:400px 1fr;gap:18px;margin-top:20px;}
@media (max-width:920px){.ant-desk{grid-template-columns:1fr;}}
.ant-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px 18px 16px;}
.ant-card h2{margin:0 0 4px;font-size:16px;font-weight:800;display:flex;align-items:center;gap:8px;}
.ant-card h2 .ant-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:7px;background:var(--pri);color:#fff;font-size:12px;font-weight:800;}
:root[data-theme="dark"] .ant-card h2 .ant-num{color:#0a1420;}
.ant-tip{font-size:12.5px;color:var(--sub);margin:0 0 12px;}
.ant-chips{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:12px;}
.ant-chip{border:1px solid var(--line);background:var(--card2);color:var(--sub);border-radius:8px;padding:4px 11px;font-size:13px;cursor:pointer;font-weight:700;transition:all .15s;}
.ant-chip:hover{border-color:var(--org);color:var(--org);}
.ant-chip.on{background:var(--org);border-color:var(--org);color:#fff;}
.ant-field{margin-bottom:12px;}
.ant-field label{display:block;font-size:13px;font-weight:700;color:var(--sub);margin-bottom:4px;}
.ant-field label i{font-style:normal;color:var(--faint);font-weight:600;}
.ant-in{width:100%;padding:9px 12px;border-radius:10px;border:1px solid var(--line);background:var(--card2);color:var(--ink);font-size:15px;outline:none;transition:border-color .15s;}
.ant-in:focus{border-color:var(--pri-2);box-shadow:0 0 0 3px var(--pri-soft);}
.ant-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px;}
.ant-btn{border:none;border-radius:10px;padding:9px 18px;font-size:14px;font-weight:800;cursor:pointer;transition:all .15s;}
.ant-btn-go{background:var(--pri);color:#fff;}
:root[data-theme="dark"] .ant-btn-go{color:#0a1420;}
.ant-btn-go:hover{background:var(--pri-2);}
.ant-btn-ghost{background:var(--card2);color:var(--pri-ink);border:1px solid var(--line);}
.ant-btn-ghost:hover{border-color:var(--pri-2);}
.ant-msg{margin-top:10px;font-size:13px;min-height:20px;font-weight:600;}
.ant-msg.err{color:var(--red);}
.ant-msg.ok{color:var(--pri);}

/* ---------- 结果 ---------- */
.ant-lam{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin-bottom:10px;}
.ant-lam .big{font-size:30px;font-weight:900;color:var(--pri-ink);font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;}
.ant-lam .lbl{font-size:13px;color:var(--sub);font-weight:700;}
.ant-tbl{width:100%;border-collapse:collapse;font-size:13.5px;}
.ant-tbl th,.ant-tbl td{border:1px solid var(--line);padding:8px 10px;text-align:left;}
.ant-tbl th{background:var(--card2);font-weight:700;white-space:nowrap;}
.ant-tbl td{font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;}
.ant-tbl tr.hl td{background:var(--org-soft);}
.ant-note{margin-top:12px;font-size:13px;color:var(--sub);background:var(--pri-soft);border-left:3px solid var(--pri);border-radius:0 10px 10px 0;padding:9px 12px;}
.ant-note b{color:var(--pri-ink);}
.ant-out{width:100%;min-height:150px;border-radius:10px;border:1px solid var(--line);background:var(--card2);color:var(--ink);padding:12px 14px;font-size:12.5px;line-height:1.7;overflow:auto;white-space:pre;margin:12px 0 0;font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;}

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