/* 검은 건반 — 장르: 그랜드 피아노 · 검정 옻칠 · 상아색 건반 · 금색 줄
 * 움직임: 첫 화면 검은 칸들이 네 줄로 흘러내림 / 누르면 금색 테두리가 퍼짐 / 틀린 칸은 빨갛게 깜빡 / 이어할 때 3·2·1 */
:root {
  --lacquer: #14141c;
  --lacquer-2: #24242f;
  --ivory: #fbfaf6;
  --gold: #e9c46a;
  --bad: #e2312b;
  --color-bg: var(--lacquer);
  --color-text: var(--ivory);
  --color-text-secondary: #b9b6ad;
  color-scheme: dark;
}
html, body { background: var(--lacquer); color: var(--ivory); }
body { background-image: linear-gradient(115deg, rgba(255, 255, 255, 0.04) 0 30%, transparent 30%); }
.tl { max-width: 980px; margin: 0 auto; padding: 0 16px 40px; }
.tl-v { max-width: 440px; margin: 0 auto; padding-top: 14px; }

.tl-hero { position: relative; height: 200px; border: 2px solid var(--gold); border-radius: 14px; background: repeating-linear-gradient(90deg, var(--ivory) 0 calc(25% - 1px), #d9d4c7 calc(25% - 1px) 25%); overflow: hidden; }
.lane i { position: absolute; top: -60px; left: calc(var(--c) * 25%); width: 25%; height: 56px; background: var(--lacquer); border: 1px solid #000; animation: tl-fall 1.75s linear infinite; animation-delay: var(--d); }
@keyframes tl-fall { to { transform: translateY(270px); } }

.tl-title { margin: 18px 0 0; font: 900 44px/1.05 var(--font-sans); letter-spacing: -0.04em; }
.tl-lead { margin: 8px 0 0; font: 600 15px/23px var(--font-sans); color: var(--color-text-secondary); word-break: keep-all; }
.tl-chal { display: grid; gap: 6px; margin-top: 16px; padding: 12px 14px 14px; border: 2px dashed var(--gold); border-radius: 14px; background: var(--lacquer-2); font: 600 14px/21px var(--font-sans); }
.tl-chal b { font: 900 18px/1.2 var(--font-sans); color: var(--gold); }
.tl-btns { display: grid; gap: 10px; margin-top: 16px; }
.tl-go { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 58px; padding: 0 16px; border: 2px solid #000; border-radius: 14px; background: var(--gold); color: #1c1606; box-shadow: 0 5px 0 #000; font: 800 16px/1.2 var(--font-sans); text-align: left; cursor: pointer; transition: transform 0.12s cubic-bezier(.34, 1.56, .64, 1), box-shadow 0.12s; }
.tl-go:active { transform: translateY(5px); box-shadow: 0 0 0 #000; }
.tl-go__k { padding: 6px 9px; border-radius: 9px; background: rgba(0, 0, 0, 0.14); font: 900 14px/1 var(--font-sans); white-space: nowrap; }
.tl-go--sub { background: var(--lacquer-2); color: var(--ivory); border-color: #000; }
.tl-go--sub .tl-go__k { background: rgba(255, 255, 255, 0.1); color: var(--gold); }
.tl-rec { margin: 12px 0 0; font: 700 14px/20px var(--font-sans); color: var(--color-text-secondary); }

.tl-hud { display: grid; grid-template-columns: auto 1fr 44px; align-items: center; gap: 12px; margin-bottom: 8px; }
.tl-score { min-width: 56px; font: 900 34px/1 var(--font-sans); color: var(--gold); }
.tl-speed { font: 700 13px/1 var(--font-sans); color: var(--color-text-secondary); }
.tl-speed b { color: var(--ivory); font-size: 16px; }
.tl-pause { width: 44px; height: 44px; border: 2px solid var(--gold); border-radius: 12px; background: var(--lacquer-2); font: 900 16px/1 var(--font-sans); color: var(--ivory); cursor: pointer; }
.tl-stage { position: relative; }
#cv { display: block; width: min(100%, calc((100dvh - 170px) * 360 / 560)); aspect-ratio: 360 / 560; height: auto; margin: 0 auto; border: 2px solid var(--gold); border-radius: 10px; touch-action: none; user-select: none; -webkit-user-select: none; cursor: pointer; }
.tl-count { position: absolute; inset: 0; display: grid; place-items: center; font: 900 90px/1 var(--font-sans); color: var(--gold); text-shadow: 0 4px 0 #000; pointer-events: none; }
.tl-pausebox { position: absolute; inset: 0; display: grid; place-content: center; gap: 10px; padding: 24px; border-radius: 10px; background: rgba(20, 20, 28, 0.92); text-align: center; }
.tl-pausebox b { font: 900 28px/1 var(--font-sans); }
.tl-pausebox span { font: 700 15px/22px var(--font-sans); color: var(--color-text-secondary); }
.tl-keys { margin: 10px 0 0; text-align: center; font: 600 13px/19px var(--font-sans); color: var(--color-text-secondary); }
@media (hover: none) { .tl-keys { display: none; } }

.tl-card { display: grid; justify-items: center; gap: 6px; padding: 20px 16px; border: 2px solid var(--gold); border-radius: 16px; background: var(--lacquer-2); }
.tl-card__k { font: 800 13px/1 var(--font-sans); color: var(--color-text-secondary); }
.tl-card__n { margin: 0; font: 900 22px/1 var(--font-sans); }
.tl-card__n b { font-size: 64px; color: var(--gold); }
.tl-card__why { font: 800 14px/1 var(--font-sans); color: #ff8a80; }
.tl-card__sp { font: 700 13px/1 var(--font-sans); color: var(--color-text-secondary); }
.tl-line { margin: 14px 0 0; font: 700 15px/22px var(--font-sans); word-break: keep-all; }
.tl-coupon { display: grid; gap: 10px; margin-top: 12px; padding: 12px; border: 2px dashed #4a4a58; border-radius: 14px; }
.tl-coupon pre { margin: 0; white-space: pre-wrap; font: 600 13px/20px var(--font-sans); color: var(--color-text-secondary); }

.tl-doc { max-width: 640px; margin: 40px auto 0; }
.tl-doc h2 { font: 900 20px/1.3 var(--font-sans); }
.tl-doc p, .tl-doc summary { font: 500 14.5px/23px var(--font-sans); color: var(--color-text-secondary); }
.tl-doc summary { color: var(--ivory); font-weight: 700; cursor: pointer; }
.rm *, .rm *::before, .rm *::after { animation: none !important; transition: none !important; }