: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:#6d3fe0; /* 기억 보라 */
  --accent-soft:rgba(109,63,224,.1);
  --ok:#1f9d63; --ok-soft:rgba(31,157,99,.12); --bad:#d6313a; --bad-soft:rgba(214,49,58,.12);
  --tile:#ecebe6; --tile-lit:#6d3fe0;
  --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)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.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{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}
.btn--lg{height:48px;padding:0 28px;font-size:15px}
kbd{font-family:var(--mono);font-size:10px;padding:1px 5px;border:1px solid currentColor;border-radius:4px;opacity:.65}
button:focus-visible,.answer: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)}
.hint{font-size:12px;color:var(--muted);margin:0;text-align:center}
.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{cursor:default;opacity:.5}

.wrap{width:100%;max-width:880px;margin:0 auto;padding:24px 28px 48px;display:flex;flex-direction:column;gap:14px}

.hud{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.hud>div{background:var(--panel);padding:10px 16px;display:flex;align-items:baseline;justify-content:space-between;gap:8px;min-width:0}
.hud-k{font-size:12px;color:var(--sub);white-space:nowrap}
.hud b{font-family:var(--mono);font-size:20px;font-weight:600;white-space:nowrap}
.hud-main{background:var(--accent) !important;color:#fff}
.hud-main .hud-k{color:rgba(255,255,255,.8)}
.hud-main b{font-size:24px}
.hearts{color:var(--bad);letter-spacing:.1em}
.hearts i{font-style:normal;color:var(--track)}

.stage{background:var(--panel);border:1px solid var(--line);border-radius:22px;min-height:400px;display:grid;place-items:center;padding:28px 24px;position:relative;overflow:hidden}
.panel{display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;width:100%;max-width:620px;animation:rise .3s ease}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.p-title{margin:0;font-size:22px;letter-spacing:-.02em;word-break:keep-all}
.p-desc{margin:0;font-size:14px;color:var(--ink-2);line-height:1.6;word-break:keep-all}
.start-ill{display:flex;gap:6px}
.start-ill span{width:48px;height:60px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-family:var(--mono);font-size:30px;font-weight:700}
.start-ill span:nth-child(2){transform:translateY(-6px)}
.start-ill.is-seq{display:grid;grid-template-columns:repeat(3,22px);gap:5px}
.start-ill.is-seq span{width:22px;height:22px;border-radius:6px;background:var(--tile);font-size:0}
.start-ill.is-seq span.on{background:var(--accent)}
.opts{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:center}
.opts-k{font-size:13px;font-weight:600;color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}
.chip{height:34px;padding:0 14px;border:1px solid var(--line-2);background:var(--panel);border-radius:999px;font-size:13px;cursor:pointer}
.chip:hover{background:var(--hover)}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.switch{display:inline-flex;align-items:center;gap:8px;font-size:13px;cursor:pointer;user-select:none}
.switch input{position:absolute;opacity:0;width:1px;height:1px}
.switch-ui{width:38px;height:22px;border-radius:999px;background:var(--track);position:relative;transition:background .2s;flex:none}
.switch-ui::after{content:"";position:absolute;left:3px;top:3px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.2);transition:transform .2s}
.switch input:checked+.switch-ui{background:var(--accent)}
.switch input:checked+.switch-ui::after{transform:translateX(16px)}
.switch input:focus-visible+.switch-ui{outline:2px solid var(--accent);outline-offset:2px}

.number{font-family:var(--mono);font-weight:700;font-size:64px;letter-spacing:.06em;line-height:1.15;word-break:break-all;max-width:100%;color:var(--ink)}
.number.is-long{font-size:44px}
.number.is-xlong{font-size:32px}
.timebar{width:min(420px,100%);height:6px;border-radius:6px;background:var(--track);overflow:hidden}
.timebar i{display:block;height:100%;width:100%;background:var(--accent);transform-origin:left}
.answer{width:min(460px,100%);height:64px;border:2px solid var(--line-2);border-radius:16px;background:var(--surface);color:var(--ink);text-align:center;font-family:var(--mono);font-size:32px;font-weight:700;letter-spacing:.08em;padding:0 12px}
.answer:focus{border-color:var(--accent);outline:none}

.panel--seq{gap:16px}
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:min(330px,100%)}
.tile{aspect-ratio:1;border:none;border-radius:16px;background:var(--tile);cursor:pointer;position:relative;transition:background .12s,transform .12s,box-shadow .12s}
.tile:hover:not(:disabled){background:var(--line-2)}
.tile:disabled{cursor:default}
.tile.is-lit{background:var(--tile-lit);transform:scale(.96);box-shadow:0 0 0 6px var(--accent-soft)}
.tile.is-tap{background:var(--tile-lit);transform:scale(.94)}
.tile.is-bad{background:var(--bad)}
.tile.is-ok{background:var(--ok)}
.tile .tn{position:absolute;right:8px;bottom:6px;font-family:var(--mono);font-size:11px;color:var(--muted)}
.tile.is-lit .tn,.tile.is-tap .tn,.tile.is-bad .tn,.tile.is-ok .tn{color:rgba(255,255,255,.75)}
.dots{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;min-height:10px}
.dots i{width:10px;height:10px;border-radius:50%;background:var(--track)}
.dots i.on{background:var(--accent)}

.judge-emoji{font-size:42px}
.judge-title{font-size:26px;letter-spacing:-.02em}
.compare{display:flex;flex-direction:column;gap:6px;align-items:center;max-width:100%}
.cmp-row{display:flex;align-items:center;gap:10px;max-width:100%}
.cmp-row>span{font-size:12px;color:var(--sub);width:42px;text-align:right;flex:none}
.cmp-row code{font-family:var(--mono);font-size:26px;font-weight:700;letter-spacing:.06em;word-break:break-all;text-align:left}
.cmp-row code i{font-style:normal;color:var(--bad);background:var(--bad-soft);border-radius:4px}
.cmp-row code u{text-decoration:none;color:var(--ok)}

.mini{display:grid;grid-template-columns:repeat(3,44px);gap:5px}
.mini span{height:44px;border-radius:10px;background:var(--tile);display:grid;place-items:center;font-family:var(--mono);font-size:12px;font-weight:700;color:var(--sub);overflow:hidden}
.mini span.on{background:var(--accent-soft);color:var(--accent);box-shadow:inset 0 0 0 1.5px var(--accent)}
.panel--result{max-width:560px}
.result-card{width:100%;border-radius:24px;padding:24px 24px 20px;color:#fff;text-align:left;background:
  radial-gradient(circle at 92% 8%,rgba(255,255,255,.16) 0 60px,transparent 61px),
  linear-gradient(140deg,#7a4cf0,#3d1fa8);box-shadow:0 22px 46px rgba(61,31,168,.22);display:flex;flex-direction:column;gap:8px}
.result-card .mono-label{color:rgba(255,255,255,.78)}
.rc-top{display:flex;justify-content:space-between;align-items:center}
.badge{font-size:11px;font-weight:700;padding:3px 9px;border-radius:999px;background:#fff;color:#3d1fa8}
.rc-main{display:flex;align-items:baseline;gap:8px}
.rc-main b{font-family:var(--mono);font-size:60px;font-weight:700;line-height:1;letter-spacing:-.03em}
.rc-main small{font-size:14px;opacity:.85}
.rc-title{font-size:19px;font-weight:700;word-break:keep-all}
.rc-desc{margin:0;font-size:14px;line-height:1.6;opacity:.92;word-break:keep-all}
.rc-trail{display:flex;flex-wrap:wrap;gap:4px;margin-top:4px}
.rc-trail span{font-family:var(--mono);font-size:12px;padding:3px 8px;border-radius:999px;background:rgba(255,255,255,.16)}
.rc-trail span.x{background:rgba(0,0,0,.22);text-decoration:line-through;opacity:.85}
.result-actions{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}

.info{display:grid;grid-template-columns:1fr 1fr;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}
.best{width:100%;border-collapse:collapse;font-size:13px}
.best th,.best td{padding:6px 4px;border-bottom:1px solid var(--line-3);text-align:right;white-space:nowrap}
.best th:first-child,.best td:first-child{text-align:left}
.best th{font-weight:500;color:var(--sub);font-size:12px}
.best td{font-family:var(--mono)}
.best td:first-child{font-family:var(--font)}
.rules{margin:0;padding-left:18px;font-size:13px;line-height:1.7;color:var(--ink-2)}
.rules b{color:var(--ink)}

.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:50}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

@media (max-width:720px){ .info{grid-template-columns:1fr} }
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .wrap{padding:16px 16px 36px;gap:12px}
  .hud>div{padding:8px 10px;flex-direction:column;gap:0}
  .hud b{font-size:17px}
  .hud-main b{font-size:20px}
  .stage{padding:22px 14px;min-height:360px;border-radius:18px}
  .p-title{font-size:19px}
  .number{font-size:44px}
  .number.is-long{font-size:32px}
  .number.is-xlong{font-size:24px}
  .answer{font-size:24px;height:56px}
  .cmp-row code{font-size:20px}
  .rc-main b{font-size:48px}
  .result-card{padding:20px 18px 18px}
}
@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:#141318; --surface:#1a1920; --panel:#1f1e26; --panel-soft:#24232c;
    --ink:#ecebf0; --ink-hover:#ffffff; --ink-2:#c9c7d1; --sub:#a09eab; --muted:#8a8895;
    --line:#2e2d36; --line-2:#393843; --line-3:#26252d; --hover:#2a2932; --soft:#26252d; --track:#34333d;
    --accent:#a88bff; --accent-soft:rgba(168,139,255,.16);
    --ok:#4cd38f; --ok-soft:rgba(76,211,143,.14); --bad:#ff6b73; --bad-soft:rgba(255,107,115,.16);
    --tile:#2a2932; --tile-lit:#8f6bff;
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,:root[data-theme="dark"] .seg-btn.is-active,:root[data-theme="dark"] .chip[aria-pressed="true"]{color:var(--bg)}
  :root[data-theme="dark"] .hud-main{background:#5a36c9 !important}
  :root[data-theme="dark"] .result-card{background:radial-gradient(circle at 92% 8%,rgba(255,255,255,.1) 0 60px,transparent 61px),linear-gradient(140deg,#5a36c9,#2a1477);box-shadow:0 22px 46px rgba(0,0,0,.4)}
  :root[data-theme="dark"] .badge{color:#2a1477}
  :root[data-theme="dark"] .tile.is-bad,:root[data-theme="dark"] .tile.is-ok{color:var(--bg)}
  :root[data-theme="dark"] .switch-ui::after{background:#ecebf0}
  :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)}
}