: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:#b86200; /* 신호등 호박색 */
  --accent-soft:rgba(232,140,20,.13);
  --lamp:#ffb020; --lamp-off:#e9e5dc;
  --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;align-items:center}
.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}
.btn:hover{background:var(--hover)}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}
.btn--sm{height:30px;padding:0 12px;font-size:12px}
button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.seg{display:flex;flex-wrap:wrap;background:var(--soft);border-radius:999px;padding:3px;gap:2px}
.seg-btn{height:30px;padding:0 13px;border:none;background:transparent;border-radius:999px;font-size:13px;color:var(--sub);cursor:pointer;white-space:nowrap}
.seg-btn.is-active{background:var(--ink);color:#fff;font-weight:500}

.wrap{width:100%;max-width:1180px;margin:0 auto;padding:28px 28px 48px;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:20px;align-items:start}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:20px;min-width:0}
.card-title{margin:0;font-size:16px;font-weight:700}
.card-title small{font-size:12px;font-weight:400;color:var(--muted);margin-left:6px}
.hint{margin:0;font-size:12.5px;line-height:1.6;color:var(--sub)}

/* 변환 */
.conv{grid-column:1/-1;display:grid;grid-template-columns:minmax(0,1fr) 36px minmax(0,1fr);gap:12px;align-items:stretch}
.conv-col{display:flex;flex-direction:column;gap:8px;min-width:0}
.col-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.col-label{font-size:13px;font-weight:700}
.area{width:100%;min-height:150px;resize:vertical;padding:14px;border:1px solid var(--line-2);border-radius:12px;background:var(--panel-soft);font:inherit;font-size:18px;line-height:1.55;color:var(--ink)}
.area--morse{font-family:var(--mono);font-size:17px;letter-spacing:.06em;color:var(--accent);font-weight:500}
.area:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.conv-mid{display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:20px;color:var(--accent);padding-top:26px}
.conv-note{grid-column:1/-1;margin:0;font-size:12.5px;color:var(--sub)}
.conv-note.is-warn{color:var(--accent);font-weight:500}

/* 플레이어 */
.player{display:flex;flex-direction:column;gap:16px}
.player-top{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.play{height:52px;padding:0 22px 0 18px;border:none;border-radius:999px;background:var(--accent);color:#fff;font-size:15px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;gap:10px;box-shadow:0 8px 20px rgba(184,98,0,.25)}
.play:hover{filter:brightness(1.06)}
.play-ic{width:0;height:0;border-left:13px solid currentColor;border-top:8px solid transparent;border-bottom:8px solid transparent}
.play.is-playing .play-ic{width:12px;height:12px;border:none;background:currentColor;border-radius:2px}
.lamp-wrap{display:flex;align-items:center;gap:10px}
.lamp{width:46px;height:46px;border-radius:50%;background:var(--lamp-off);border:3px solid var(--line-2);transition:background .03s,box-shadow .03s}
.lamp.is-on{background:var(--lamp);border-color:#fff3d6;box-shadow:0 0 0 6px rgba(255,176,32,.25),0 0 28px 8px rgba(255,176,32,.55)}
.toggles{display:flex;gap:14px;flex-wrap:wrap;margin-left:auto}
.check{display:flex;align-items:center;gap:6px;font-size:13.5px;cursor:pointer}
.check input{width:17px;height:17px;margin:0;accent-color:var(--accent)}

.tape{position:relative;display:flex;flex-wrap:wrap;gap:6px;max-height:170px;overflow-y:auto;padding:12px;border-radius:12px;background:var(--panel-soft);border:1px solid var(--line-3)}
.tape-empty{font-size:13px;color:var(--muted)}
.cell{display:inline-flex;flex-direction:column;align-items:center;gap:2px;min-width:38px;padding:6px 7px;border-radius:8px;background:var(--panel);border:1px solid var(--line-3);transition:background .08s,border-color .08s}
.cell b{font-size:15px;font-weight:700;line-height:1.1}
.sig{display:inline-flex;align-items:center;gap:3px;height:10px;color:var(--accent)}
.sig i{display:block;background:currentColor;border-radius:2px;flex:none}
.sig .dt{width:5px;height:5px;border-radius:50%}
.sig .da{width:14px;height:5px}
.sig .un{width:auto;height:auto;background:none;font-style:normal;font-size:11px}
.cell--gap{min-width:14px;background:transparent;border:none;padding:0}
.cell--more{border:none;background:transparent;color:var(--muted)}
.cell.is-now{background:var(--accent);border-color:var(--accent);color:#fff}
.cell.is-now .sig{color:#fff}

.sliders{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px 20px}
.slider{display:flex;flex-direction:column;gap:8px;min-width:0}
.slider-head{display:flex;justify-content:space-between;align-items:center;gap:6px;font-size:13px;font-weight:500}
.slider input[type=range]{width:100%;accent-color:var(--accent)}
.slider .tb-presets{flex-wrap:wrap}

/* 두드리기 */
.keyer{display:flex;flex-direction:column;gap:16px}
.keyer-head{display:flex;flex-direction:column;gap:12px}
.keyer-head .hint{margin-top:4px}
.keyer-body{display:grid;grid-template-columns:150px minmax(0,1fr);gap:18px;align-items:start}
.key{width:150px;height:150px;border-radius:50%;border:none;padding:0;cursor:pointer;touch-action:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;
  background:radial-gradient(circle at 50% 38%,#4a4844,#1c1c1a 70%);box-shadow:0 10px 0 #0e0e0d,0 18px 30px rgba(0,0,0,.25);transition:transform .05s,box-shadow .05s;color:#fff}
.key-cap{display:flex;flex-direction:column;align-items:center;gap:2px}
.key-cap b{font-family:var(--mono);font-size:20px;letter-spacing:.2em;padding-left:.2em}
.key-cap small{font-size:11px;color:#c9c5bb}
.key.is-down{transform:translateY(8px);box-shadow:0 2px 0 #0e0e0d,0 6px 14px rgba(0,0,0,.25);background:radial-gradient(circle at 50% 38%,#ffc65a,#e08a00 72%);color:#2a1800}
.key.is-down .key-cap small{color:#4a2c00}
.keyer-out{display:flex;flex-direction:column;gap:10px;min-width:0}
.cur{display:flex;align-items:center;gap:10px;min-height:30px;flex-wrap:wrap}
.cur-sym{min-width:20px;display:inline-flex}
.cur-sym .sig{height:14px;gap:5px}
.cur-sym .dt{width:9px;height:9px}
.cur-sym .da{width:26px;height:9px}
.gap-bar{flex:1;min-width:80px;height:6px;border-radius:999px;background:var(--track);overflow:hidden;position:relative}
.gap-bar::before,.gap-bar::after{content:"";position:absolute;top:0;bottom:0;width:2px;background:var(--panel)}
.gap-bar::before{left:42.86%}
.gap-bar::after{display:none}
.gap-bar i{display:block;height:100%;width:0;background:var(--muted)}
.gap-bar i.is-letter{background:var(--accent)}
.gap-bar i.is-word{background:var(--ink)}
.decoded{min-height:56px;padding:12px 14px;border-radius:12px;background:var(--panel-soft);border:1px solid var(--line-3);font-size:24px;font-weight:700;letter-spacing:.04em;word-break:break-all}
.decoded.is-empty{font-size:13px;font-weight:400;color:var(--muted);letter-spacing:0}
.key-morse{font-family:var(--mono);font-size:13px;color:var(--sub);word-break:break-all;min-height:18px}
.keyer-actions{display:flex;flex-wrap:wrap;gap:6px}

/* 부호표 */
.chart{grid-column:1/-1;display:flex;flex-direction:column;gap:14px}
.chart-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.chart-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:6px}
.ch{display:flex;align-items:center;justify-content:space-between;gap:6px;padding:9px 11px;border:1px solid var(--line-3);background:var(--panel-soft);border-radius:10px;cursor:pointer;text-align:left;min-width:0}
.ch b{font-size:16px}

.ch:hover{border-color:var(--accent)}
.ch.is-playing{background:var(--accent);border-color:var(--accent);color:#fff}
.ch.is-playing .sig{color:#fff}

/* 빛 크게 보기 */
.flash{position:fixed;inset:0;z-index:60;background:#0b0b0a;display:flex;align-items:center;justify-content:center;cursor:pointer}
.flash.is-on{background:#ffd27a}
.flash-close{position:absolute;top:16px;right:16px;height:38px;padding:0 16px;border-radius:999px;border:1px solid rgba(255,255,255,.35);background:rgba(0,0,0,.45);color:#fff;font-size:13px;cursor:pointer}
.flash-label{position:absolute;bottom:28px;left:0;right:0;text-align:center;font-family:var(--mono);font-size:22px;color:rgba(255,255,255,.55);mix-blend-mode:difference}

.toast{position:fixed;left:50%;bottom:28px;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:960px){
  .wrap{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .wrap{padding:16px 16px 40px;gap:16px}
  .card{padding:16px}
  .conv{grid-template-columns:minmax(0,1fr)}
  .conv-mid{padding:0;transform:rotate(90deg);height:20px}
  .area{min-height:110px;font-size:16px}
  .sliders{grid-template-columns:minmax(0,1fr)}
  .toggles{margin-left:0}
  .keyer-body{grid-template-columns:minmax(0,1fr);justify-items:center}
  .keyer-out{width:100%}
  .key{width:140px;height:140px}
  .chart-grid{grid-template-columns:repeat(auto-fill,minmax(84px,1fr))}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#141312; --surface:#1a1918; --panel:#201e1c; --panel-soft:#252320;
    --ink:#efebe5; --ink-hover:#ffffff; --ink-2:#cbc6be; --sub:#a59f96; --muted:#8e887f;
    --line:#312e2a; --line-2:#3c3934; --line-3:#292724; --hover:#2c2a27; --soft:#2a2825; --track:#383530;
    --accent:#ffb347; --accent-soft:rgba(255,179,71,.14);
    --lamp-off:#2e2b27;
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,:root[data-theme="dark"] .seg-btn.is-active,
  :root[data-theme="dark"] .tb-presets button[aria-pressed="true"]{color:var(--bg)}
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .seg-btn.is-active{background:var(--accent)}
  :root[data-theme="dark"] .btn--solid:hover{background:#ffc46e}
  :root[data-theme="dark"] .play{color:#1a1206;box-shadow:0 8px 20px rgba(0,0,0,.35)}
  :root[data-theme="dark"] .cell.is-now,:root[data-theme="dark"] .ch.is-playing{color:#1a1206}
  :root[data-theme="dark"] .cell.is-now .sig,:root[data-theme="dark"] .ch.is-playing .sig{color:#1a1206}
  :root[data-theme="dark"] .key{box-shadow:0 10px 0 #050505,0 0 0 1px var(--line-2),0 18px 30px rgba(0,0,0,.4)}
}