: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:#2a4bff; --accent-soft:#e6eaff; --err:#ff4d2e;
  --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;touch-action:manipulation}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:100vh;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{margin:0;font-size:17px;font-weight:700;letter-spacing:-.01em}
.actions{display:flex;align-items:center;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}
.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--accent{background:var(--accent);color:#fff;border:none;font-weight:500}
.btn--accent:hover{background:var(--accent);filter:brightness(1.1)}
.btn--lg{height:44px;padding:0 24px;font-size:14px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (max-width:640px){ .topbar{padding:14px 16px} }

/* ---------- 레이아웃 ---------- */
.ce{flex:1;display:flex;flex-wrap:wrap;align-items:stretch;min-height:0}
.stage{flex:999 1 560px;min-width:0;display:flex;flex-direction:column;align-items:center;gap:16px;padding:32px 28px 44px}
.stage > *{width:100%;max-width:760px}
.side{flex:1 1 280px;min-width:0;max-width:100%;border-left:1px solid var(--line);background:var(--panel);padding:28px 24px 40px;display:flex;flex-direction:column;gap:26px}
.group{display:flex;flex-direction:column;gap:12px}
.group + .group{border-top:1px solid var(--line-3);padding-top:22px}
.rules{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:9px;font-size:13px;color:var(--ink-2);line-height:1.6;counter-reset:rule}
.rules li{display:flex;gap:10px}
.rules li::before{counter-increment:rule;content:counter(rule,decimal-leading-zero);font-family:var(--mono);font-size:11px;color:var(--accent);padding-top:3px;flex-shrink:0}
.keys{display:flex;flex-direction:column;gap:8px;font-size:12px;color:var(--ink-2)}
.keys div{display:flex;justify-content:space-between;align-items:center;gap:12px}
.kbd{display:inline-block;font-family:var(--mono);font-size:11px;line-height:1.4;padding:1px 6px;border:1px solid var(--line-2);border-bottom-width:2px;border-radius:5px;background:var(--surface);color:var(--ink)}
.best-card{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px;border-radius:12px;background:var(--ink);color:#fff}
.best-card .mono-label{color:#a8a59c}
.best-val{font-family:var(--mono);font-size:20px;font-weight:700;letter-spacing:-.02em}

/* ---------- 과제 헤더 ---------- */
.task-head{display:flex;align-items:stretch;gap:16px}
.task-no{flex:0 0 auto;display:flex;flex-direction:column;justify-content:center;gap:2px;padding:0 18px 0 0;border-right:1px solid var(--line-2)}
.task-num b{font-family:var(--mono);font-size:34px;font-weight:800;letter-spacing:-.04em;line-height:1}
.task-num i{font-style:normal;font-family:var(--mono);font-size:13px;color:var(--muted);margin-left:2px}
.task-text{min-width:0;display:flex;flex-direction:column;gap:4px;justify-content:center}
.task-unit{align-self:flex-start;padding:2px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-family:var(--mono);font-size:10.5px;font-weight:700;letter-spacing:.12em}
.task-name{margin:0;font-size:22px;font-weight:700;letter-spacing:-.02em;line-height:1.25}
.task-desc{margin:0;font-size:13.5px;color:var(--ink-2);line-height:1.5}
.task-head.is-in .task-name,.task-head.is-in .task-desc{animation:slideIn .35s ease-out}

/* ---------- 보드 ---------- */
.board{position:relative;border-radius:20px;background:#fff;border:1px solid var(--line);box-shadow:0 1px 0 var(--line-2),0 30px 70px -40px rgba(42,75,255,.5);overflow:hidden}
.cv{display:block;width:100%;aspect-ratio:4/3;touch-action:none;user-select:none;-webkit-user-select:none;cursor:crosshair}
.cv:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--accent)}
.cv.is-done{cursor:default}
.scale-tag{position:absolute;right:14px;bottom:10px;font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:#c4c1b8;pointer-events:none}
.flash{position:absolute;left:16px;top:16px;display:flex;align-items:baseline;gap:10px;padding:10px 16px;border-radius:14px;background:rgba(28,28,26,.92);color:#fff;pointer-events:none;animation:pop .4s cubic-bezier(.2,1.3,.4,1)}
.flash-err{font-family:var(--mono);font-size:26px;font-weight:800;letter-spacing:-.03em}
.flash-score{font-family:var(--mono);font-size:12px;color:#a9b7ff}

.controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.controls .btn--lg{margin-left:auto}
.chip{display:inline-flex;align-items:center;gap:8px;height:36px;padding:0 14px;background:var(--panel);border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer;-webkit-tap-highlight-color:transparent}
.chip-dot{width:10px;height:10px;border-radius:50%;border:1.5px solid var(--muted);transition:background .15s,border-color .15s}
.chip[aria-pressed="true"]{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
.chip[aria-pressed="true"] .chip-dot{background:var(--accent);border-color:var(--accent)}
.ctl-hint{font-size:12px;color:var(--muted)}
.ctl-result{font-size:14px;color:var(--ink-2)}
.ctl-result b{font-family:var(--mono);color:var(--ink)}

/* ---------- 라운드 목록 ---------- */
.round-list{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:2px;counter-reset:rl}
.round-list li{counter-increment:rl;display:grid;grid-template-columns:24px 1fr auto;align-items:center;gap:10px;padding:7px 8px;border-radius:8px;font-size:13px;color:var(--muted)}
.round-list li::before{content:counter(rl,decimal-leading-zero);font-family:var(--mono);font-size:10.5px}
.round-list li.is-current{background:var(--accent-soft);color:var(--ink)}
.round-list li.is-done{color:var(--ink-2)}
.rl-name{min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rl-err{font-family:var(--mono);font-size:12px;font-weight:700}

/* ---------- 결과 카드 ---------- */
.result{display:flex;flex-direction:column;align-items:center;gap:16px}
.card{position:relative;width:100%;max-width:520px;padding:30px 28px 22px;border-radius:24px;background:var(--accent);color:#fff;overflow:hidden;box-shadow:0 30px 70px -30px rgba(42,75,255,.7);animation:rise .5s cubic-bezier(.2,1.1,.4,1)}
.card-eye{position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;border:1.5px solid rgba(255,255,255,.35)}
.card-eye::before,.card-eye::after{content:"";position:absolute;background:rgba(255,255,255,.35)}
.card-eye::before{left:50%;top:0;bottom:0;width:1.5px}
.card-eye::after{top:50%;left:0;right:0;height:1.5px}
.card-eye span{position:absolute;inset:70px;border-radius:50%;background:rgba(255,255,255,.18)}
.card-kicker{color:rgba(255,255,255,.7);font-size:10px}
.card-lead{margin:18px 0 0;font-size:16px;font-weight:500}
.card-big{margin:0;display:flex;align-items:baseline;gap:6px;line-height:1}
.card-big b{font-family:var(--mono);font-size:84px;font-weight:800;letter-spacing:-.06em}
.card-big i{font-style:normal;font-family:var(--mono);font-size:26px;font-weight:700}
.card-deg{margin:8px 0 0;font-size:14px;color:rgba(255,255,255,.85)}
.card-deg b{font-family:var(--mono)}
.card-grade{display:flex;align-items:center;gap:14px;margin-top:20px;padding:14px;border-radius:16px;background:#fff;color:var(--ink)}
.card-score{flex:0 0 auto;min-width:58px;height:58px;display:grid;place-items:center;border-radius:50%;background:var(--ink);color:#fff;font-family:var(--mono);font-size:22px;font-weight:800}
.card-title{display:flex;flex-direction:column;gap:2px;min-width:0}
.card-title b{font-size:17px}
.card-title span{font-size:12.5px;color:var(--sub);line-height:1.45}
.card-list{margin:16px 0 0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 18px}
.card-list li{display:flex;justify-content:space-between;gap:8px;padding:5px 0;border-top:1px solid rgba(255,255,255,.22);font-size:12.5px;min-width:0}
.card-list li span:first-child{min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:rgba(255,255,255,.85)}
.card-list li span:last-child{font-family:var(--mono);font-weight:700;white-space:nowrap}
.card-best{margin:14px 0 0;font-size:12px;color:rgba(255,255,255,.8)}
.result-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}

.toast{position:fixed;left:50%;bottom:28px;z-index:100;transform:translate(-50%,20px);max-width:calc(100vw - 32px);width:max-content;padding:10px 18px;border-radius:18px;background:var(--ink);color:#fff;font-size:13px;line-height:1.45;text-align:center;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s}
.toast.is-on{opacity:1;transform:translate(-50%,0)}

@keyframes pop{from{opacity:0;transform:scale(.7)}to{opacity:1;transform:none}}
@keyframes rise{from{opacity:0;transform:translateY(18px) scale(.97)}to{opacity:1;transform:none}}
@keyframes slideIn{from{opacity:0;transform:translateX(-10px)}to{opacity:1;transform:none}}

@media (max-width:640px){
  .stage{padding:20px 16px 32px;gap:12px}
  .side{border-left:none;border-top:1px solid var(--line);padding:24px 16px 40px}
  .task-head{gap:12px}
  .task-no{padding-right:12px}
  .task-num b{font-size:26px}
  .task-name{font-size:18px}
  .task-desc{font-size:12.5px}
  .board{border-radius:14px}
  .flash{left:10px;top:10px;padding:6px 12px}
  .flash-err{font-size:20px}
  .ctl-hint{display:none}
  .controls .btn--lg{flex:1}
  .card{padding:24px 20px 18px}
  .card-big b{font-size:64px}
  .card-list{grid-template-columns:minmax(0,1fr)}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) — 판(캔버스) 색은 --cv-* 로 app.js가 읽음, 도형 위치·크기는 그대로 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#131418; --surface:#191a1f; --panel:#1e1f25; --panel-soft:#23242b;
    --ink:#eaebf0; --ink-hover:#ffffff; --ink-2:#c6c8d0; --sub:#9d9fab; --muted:#888a96;
    --line:#2c2d35; --line-2:#373842; --line-3:#25262d; --hover:#282930; --soft:#25262d; --track:#32333c;
    --accent:#7d93ff; --accent-soft:rgba(125,147,255,.16); --err:#ff6a4f;
    --cv-ink:#e6e7ee; --cv-ink2:#b3b5c1; --cv-faint:#3f414d; --cv-fill:#2a2c37; --cv-acc:#7d93ff; --cv-err:#ff6a4f;
    --cv-white:#1e1f25; --cv-frame:#262832; --cv-loupe:#1e1f25; --cv-accA:rgba(125,147,255,.4);
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .btn--accent,:root[data-theme="dark"] .toast{color:var(--bg)}
  :root[data-theme="dark"] .best-card{background:#262838;color:#fff}
  :root[data-theme="dark"] .board{background:var(--panel);border-color:var(--line-2);box-shadow:0 30px 70px -40px rgba(0,0,0,.8)}
  :root[data-theme="dark"] .scale-tag{color:#7c7e8a}
  :root[data-theme="dark"] .flash{background:rgba(10,10,14,.92);box-shadow:0 0 0 1px var(--line-2)}
  :root[data-theme="dark"] .card{background:#2a4bff;box-shadow:0 30px 70px -30px rgba(0,0,0,.8)}
  :root[data-theme="dark"] .card-grade{background:var(--panel)}
  :root[data-theme="dark"] .card-score{color:var(--bg)}
}