:root{
  --bg:#f5f4f0; --surface:#fbfbf9; --panel:#ffffff; --panel-soft:#f7f6f2;
  --ink:#1c1c1a; --ink-hover:#3a3935; --ink-2:#55534d; --sub:#7a776f; --muted:#8a877f;
  --line:#e3e1db; --line-2:#dcdad3; --line-3:#efeee9; --hover:#efeee9; --soft:#f3f2ee; --track:#ebe9e3;
  --accent:#0d8f6f; /* 음파 에메랄드 */
  --accent-soft:rgba(13,143,111,.1);
  --warn:#b45309; --warn-bg:#fff6e6; --warn-line:#f3d7a6;
  --stop:#d6313a; --yes:#0d8f6f; --no:#55534d;
  --font:"IBM Plex Sans KR",sans-serif; --mono:"JetBrains Mono",monospace;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased}
button{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:calc(100vh - 48px);display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;border-bottom:1px solid var(--line);background:var(--surface);flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:14px;min-width:0;flex-wrap:wrap}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em;margin:0}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer;white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn:hover:not(:disabled){background:var(--hover)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover:not(:disabled){background:var(--ink-hover)}
.btn--sm{height:30px;padding:0 12px;font-size:12px}
.btn--lg{height:48px;padding:0 30px;font-size:15px}
.btn--stop{border-color:var(--stop);color:var(--stop);font-weight:600}
.btn--stop:hover:not(:disabled){background:rgba(214,49,58,.08)}
kbd{font-family:var(--mono);font-size:10px;padding:1px 5px;border:1px solid currentColor;border-radius:4px;opacity:.7}
button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.link{background:none;border:none;padding:4px 0;color:var(--sub);font-size:13px;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.link:hover{color:var(--ink)}
.note{font-size:12px;color:var(--muted);line-height:1.6;margin:0}
.note b{color:var(--ink-2)}
.seg{display:flex;background:var(--soft);border-radius:999px;padding:3px;gap:2px}
.seg-btn{height:30px;padding:0 14px;border:none;background:transparent;border-radius:999px;font-size:13px;color:var(--sub);cursor:pointer;white-space:nowrap}
.seg-btn.is-active{background:var(--accent);color:#fff;font-weight:500}
.seg-btn:disabled{opacity:.5;cursor:default}

.wrap{width:100%;max-width:900px;margin:0 auto;padding:24px 28px 96px;display:flex;flex-direction:column;gap:14px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:20px 22px}

/* 안전 안내 */
.safety{display:flex;gap:16px;padding:20px 22px;border-radius:20px;background:var(--warn-bg);border:1px solid var(--warn-line)}
.safety-icon{font-size:30px;line-height:1}
.safety-body{flex:1;min-width:0}
.safety-title{margin:0 0 8px;font-size:17px;color:var(--warn)}
.safety ul{margin:0 0 12px;padding-left:18px;font-size:13px;line-height:1.75;color:var(--ink-2)}
.safety b{color:var(--ink)}
.check{display:flex;align-items:flex-start;gap:10px;padding:10px 14px;border-radius:12px;background:var(--panel);border:1px solid var(--warn-line);font-size:14px;font-weight:600;cursor:pointer}
.check input{width:18px;height:18px;margin:1px 0 0;accent-color:var(--accent);flex:none}

/* 설정 */
.controls{display:grid;grid-template-columns:1.4fr 1fr;gap:20px;align-items:start}
.vol{display:flex;flex-direction:column;gap:8px}
.vol-head{display:flex;justify-content:space-between;align-items:center;gap:10px}
.vol-k{font-size:14px;font-weight:600}
#vol{width:100%;accent-color:var(--accent)}
.ref{display:flex;flex-direction:column;gap:8px;align-items:flex-start}

/* 무대 */
.stage{display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;min-height:380px}
.stage-top{width:100%;display:flex;justify-content:space-between;align-items:center}
.freq{display:flex;align-items:baseline;gap:6px;margin-top:6px}
.freq b{font-family:var(--mono);font-size:72px;font-weight:700;letter-spacing:-.04em;line-height:1;color:var(--ink)}
.freq small{font-family:var(--mono);font-size:18px;color:var(--sub)}
.wave{display:flex;align-items:center;gap:5px;height:34px}
.wave i{width:5px;height:6px;border-radius:3px;background:var(--line-2)}
.stage.is-playing .wave i{background:var(--accent);animation:wv .9s ease-in-out infinite}
.stage.is-playing .wave i:nth-child(2){animation-delay:.1s}.stage.is-playing .wave i:nth-child(3){animation-delay:.2s}
.stage.is-playing .wave i:nth-child(4){animation-delay:.3s}.stage.is-playing .wave i:nth-child(5){animation-delay:.2s}
.stage.is-playing .wave i:nth-child(6){animation-delay:.1s}
@keyframes wv{0%,100%{height:6px}50%{height:30px}}
.status{margin:0;font-size:15px;color:var(--ink-2);line-height:1.6;max-width:560px;word-break:keep-all;min-height:3.2em}
.answer{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;align-items:center}
.btn--big{height:58px;padding:0 30px;font-size:17px;font-weight:700;border-radius:18px}
.btn--yes{background:var(--yes);border-color:var(--yes);color:#fff}
.btn--yes:hover:not(:disabled){background:#0b7a5f}
.btn--no{background:var(--panel);border:2px solid var(--line-2);color:var(--ink)}
.sweepbar{width:min(460px,100%);height:8px;border-radius:8px;background:var(--track);overflow:hidden}
.sweepbar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--accent),#7bd8bd)}
.ladder{list-style:none;margin:6px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.ladder li{font-family:var(--mono);font-size:12px;padding:5px 10px;border-radius:999px;background:var(--soft);color:var(--sub)}
.ladder li.yes{background:var(--accent-soft);color:var(--accent);font-weight:700}
.ladder li.no{background:var(--soft);color:var(--muted);text-decoration:line-through}
.ladder li.cur{box-shadow:inset 0 0 0 2px var(--ink);color:var(--ink)}
.ladder li.catch{border:1px dashed var(--line-2)}

/* 결과 */
.result{display:flex;flex-direction:column;align-items:center;gap:12px;animation:rise .35s ease}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.result-card{width:100%;max-width:560px;border-radius:24px;padding:24px 24px 20px;color:#fff;background:
  repeating-radial-gradient(circle at 100% 0,rgba(255,255,255,.08) 0 2px,transparent 2px 22px),
  linear-gradient(145deg,#0f9f7b,#0a5c63);box-shadow:0 22px 46px rgba(10,92,99,.22);display:flex;flex-direction:column;gap:6px}
.result-card .mono-label{color:rgba(255,255,255,.78)}
.rc-top{display:flex;justify-content:space-between;align-items:center;gap:8px}
.badge{font-size:11px;font-weight:700;padding:3px 9px;border-radius:999px;background:#fff;color:#0a5c63;white-space:nowrap}
.rc-k{font-size:13px;opacity:.85;margin-top:6px}
.rc-age{font-size:46px;font-weight:700;letter-spacing:-.03em;line-height:1.1}
.rc-hz{font-size:14px;opacity:.9}
.rc-hz b{font-family:var(--mono);font-size:16px}
.scale{margin:10px 0 2px}
.scale-bar{position:relative;height:10px;border-radius:10px;background:linear-gradient(90deg,rgba(255,255,255,.25),rgba(255,255,255,.6))}
.scale-bar i{position:absolute;top:50%;width:18px;height:18px;border-radius:50%;background:#fff;border:3px solid #0a5c63;transform:translate(-50%,-50%);left:0;transition:left .6s cubic-bezier(.2,.8,.2,1)}
.scale-lab{display:flex;justify-content:space-between;font-family:var(--mono);font-size:11px;opacity:.8;margin-top:6px}
.rc-desc{margin:4px 0 0;font-size:14px;line-height:1.6;opacity:.95;word-break:keep-all}
.cautions{width:100%;max-width:560px;margin:0;padding:12px 16px 12px 32px;border-radius:14px;background:var(--panel);border:1px solid var(--line);font-size:13px;line-height:1.7;color:var(--ink-2)}
.cautions li.warn{color:var(--warn);font-weight:600}
.result-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}

.info{display:grid;grid-template-columns:1fr 1.2fr;gap:14px}
.info-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:18px 20px;display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.history{margin:0;padding:0;list-style:none;width:100%;display:flex;flex-direction:column;gap:6px;font-size:13px}
.history li{display:flex;justify-content:space-between;gap:10px;padding:7px 0;border-bottom:1px solid var(--line-3)}
.history li b{font-family:var(--mono)}
.history li span{color:var(--sub)}
.history .empty{color:var(--muted);border:none}
.rules{margin:0;padding-left:18px;font-size:13px;line-height:1.7;color:var(--ink-2)}
.rules b{color:var(--ink)}

/* 항상 보이는 정지 바 */
.stopbar{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:60;display:flex;align-items:center;gap:14px;padding:8px 8px 8px 18px;border-radius:999px;background:var(--ink);color:#fff;box-shadow:0 12px 30px rgba(0,0,0,.25);max-width:calc(100vw - 24px)}
.stopbar-t{display:flex;align-items:center;gap:8px;font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.dot{width:8px;height:8px;border-radius:50%;background:#ff5a63;animation:blink 1s infinite;flex:none}
@keyframes blink{50%{opacity:.3}}
.btn--stop-big{height:44px;padding:0 22px;border:none;background:var(--stop);color:#fff;font-size:15px;font-weight:700;flex:none}
.btn--stop-big:hover{background:#b8252e !important}
.btn--stop-big kbd{border-color:rgba(255,255,255,.6)}

.toast{position:fixed;left:50%;bottom:84px;transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:70}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

@media (max-width:720px){
  .controls,.info{grid-template-columns:1fr}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .wrap{padding:16px 16px 96px;gap:12px}
  .panel{padding:16px}
  .safety{flex-direction:column;gap:8px;padding:16px}
  .freq b{font-size:56px}
  .btn--big{height:54px;padding:0 22px;font-size:16px;flex:1 1 40%}
  .rc-age{font-size:38px}
  .result-card{padding:20px 18px 18px}
  .stopbar{left:12px;right:12px;transform:none;max-width:none;justify-content:space-between}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition:none !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#121615; --surface:#171c1b; --panel:#1c2221; --panel-soft:#212827;
    --ink:#e8eeec; --ink-hover:#ffffff; --ink-2:#c3cdca; --sub:#9aa7a3; --muted:#86938f;
    --line:#2a3331; --line-2:#35403d; --line-3:#232b29; --hover:#263130; --soft:#232c2a; --track:#33403d;
    --accent:#4fd1a8; --accent-soft:rgba(79,209,168,.15);
    --warn:#ffb757; --warn-bg:#2a2216; --warn-line:#5a4524;
    --stop:#ff5a63; --yes:#14a37f; --no:#c3cdca;
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,:root[data-theme="dark"] .seg-btn.is-active{color:var(--bg)}
  :root[data-theme="dark"] .btn--yes{color:#fff}
  :root[data-theme="dark"] .btn--yes:hover:not(:disabled){background:#119170}
  :root[data-theme="dark"] .stopbar{background:#0b0e0d;color:var(--ink);border:1px solid var(--line-2);box-shadow:0 12px 30px rgba(0,0,0,.5)}
  :root[data-theme="dark"] .btn--stop-big{background:#d6313a;color:#fff}
  :root[data-theme="dark"] .result-card{background:repeating-radial-gradient(circle at 100% 0,rgba(255,255,255,.06) 0 2px,transparent 2px 22px),linear-gradient(145deg,#0c7d61,#073f45);box-shadow:0 22px 46px rgba(0,0,0,.4)}
  :root[data-theme="dark"] .scale-bar i{border-color:#073f45}
  :root[data-theme="dark"] .badge{color:#073f45}
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .seg-btn.is-active,:root[data-theme="dark"] .chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--bg)}
  :root[data-theme="dark"] .btn--solid:hover:not(:disabled){background:var(--accent);filter:brightness(1.1)}
}