/* loop-station — 루프 페달·믹서 콘솔에서 가져온 하드웨어 느낌의 UI */

:root {
  /* 섀시(금속 몸체) */
  --chassis: #131519;
  --chassis-lip: #0b0c0f;
  --panel: #1f232a;
  --panel-hi: #2a2f38;
  --engrave: #0c0e11;
  --edge: #3c424d;
  --edge-soft: #2b3038;

  /* 잉크 */
  --ink: #eceae5;
  --ink-mid: #b3b8c0;
  --ink-dim: #838a95;

  /* 상태 LED */
  --led-off: #5c6572;
  --led-red: #e5484d;
  --led-amber: #f08a2e;
  --led-green: #33c184;
  --led-blue: #4f9ad6;

  --focus: #ffd166;
  --radius: 10px;
  --mono: ui-monospace, "Cascadia Mono", Consolas, "D2Coding", monospace;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0 0 3rem;
  min-height: 100vh;
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  color: var(--ink);
  background: var(--chassis-lip);
  /* 얇은 브러시드 메탈 결 */
  background-image:
    repeating-linear-gradient(90deg, rgba(255,255,255,.012) 0 1px, transparent 1px 3px),
    radial-gradient(120% 80% at 50% -10%, #1c2027 0%, #0b0c0f 70%);
  line-height: 1.55;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skiplink {
  position: absolute; left: 8px; top: -60px; z-index: 50;
  background: var(--led-amber); color: #17140f; font-weight: 700;
  padding: .6rem 1rem; border-radius: 0 0 8px 8px; text-decoration: none;
  transition: top .15s;
}
.skiplink:focus { top: 0; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.station {
  max-width: 1180px;
  margin: 0 auto;
  padding: 1.25rem clamp(.75rem, 3vw, 1.75rem) 0;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

/* ---------- 상단 ---------- */

.head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border-radius: 14px;
  background: linear-gradient(180deg, var(--panel-hi), var(--panel));
  border: 1px solid var(--edge-soft);
  box-shadow: 0 1px 0 rgba(255,255,255,.05) inset, 0 10px 26px rgba(0,0,0,.5);
}

.head__brand { display: flex; align-items: center; gap: .9rem; }

/* 입력 잭 모양 */
.head__jack {
  width: 40px; height: 40px; border-radius: 50%;
  background: radial-gradient(circle at 50% 42%, #0a0b0d 0 26%, #4a515c 27% 40%, #23272e 41% 72%, #60666f 73% 82%, #1a1d22 83%);
  box-shadow: 0 2px 5px rgba(0,0,0,.6), 0 0 0 1px #000;
  flex: none;
}

.head__names { min-width: 0; }

.head__title {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: .22em;
  font-weight: 500;
  color: #cfd3d9;
  text-shadow: 0 1px 0 #000;
}
.head__title b { color: var(--led-amber); font-weight: 800; }
.head__sub { margin: .15rem 0 0; font-size: .82rem; color: var(--ink-dim); }

.head__io { display: flex; flex-direction: column; gap: .5rem; min-width: 280px; }

.meter { display: flex; align-items: center; gap: .6rem; }
.meter__cap { font-size: .72rem; letter-spacing: .14em; color: var(--ink-dim); }
.meter__leds {
  display: flex; gap: 3px; padding: 5px 6px; border-radius: 6px;
  background: var(--engrave);
  box-shadow: 0 1px 0 rgba(255,255,255,.05), inset 0 2px 5px rgba(0,0,0,.8);
}
.meter__seg {
  width: 9px; height: 16px; border-radius: 2px;
  background: #23272d;
  transition: background .06s linear, box-shadow .06s linear;
}
.meter__seg[data-on="1"] { background: var(--led-green); box-shadow: 0 0 6px rgba(51,193,132,.75); }
.meter__seg[data-zone="warn"][data-on="1"] { background: var(--led-amber); box-shadow: 0 0 6px rgba(240,138,46,.8); }
.meter__seg[data-zone="clip"][data-on="1"] { background: var(--led-red); box-shadow: 0 0 8px rgba(229,72,77,.9); }
.meter__db { font-family: var(--mono); font-size: .78rem; color: var(--ink-mid); min-width: 4.5ch; }

.head__warn {
  margin: 0; font-size: .8rem; color: var(--ink-mid);
  padding: .4rem .6rem; border-left: 3px solid var(--led-amber);
  background: rgba(240,138,46,.08); border-radius: 0 6px 6px 0;
}
.head__warn b { color: var(--led-amber); }

/* ---------- 전원 ---------- */

.boot {
  padding: 1.5rem;
  border-radius: 14px;
  background: linear-gradient(180deg, var(--panel-hi), var(--panel));
  border: 1px solid var(--edge-soft);
  box-shadow: 0 10px 26px rgba(0,0,0,.5);
  text-align: center;
}
.boot__title { margin: 0 0 .35rem; font-size: .78rem; letter-spacing: .2em; color: var(--ink-dim); text-transform: uppercase; }
.boot__desc { margin: 0 auto 1.1rem; max-width: 46ch; color: var(--ink-mid); font-size: .9rem; }
.boot__msg { margin: .9rem 0 0; font-size: .88rem; color: var(--led-amber); min-height: 1.3em; }

.power {
  display: inline-flex; align-items: center; gap: .8rem;
  padding: .95rem 1.7rem;
  font: inherit; font-weight: 700; font-size: 1.02rem; color: #17140f;
  background: linear-gradient(180deg, #ffb25e, #e07c22);
  border: 1px solid #a85c14;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(255,255,255,.45) inset, 0 6px 0 #8a4a10, 0 12px 20px rgba(0,0,0,.5);
  transition: transform .06s, box-shadow .06s;
}
.power:hover { filter: brightness(1.05); }
.power:active { transform: translateY(4px); box-shadow: 0 1px 0 rgba(255,255,255,.4) inset, 0 2px 0 #8a4a10, 0 6px 12px rgba(0,0,0,.5); }
.power__ring {
  width: 18px; height: 18px; border-radius: 50%;
  border: 3px solid #17140f; border-top-color: transparent;
}
.power[disabled] { opacity: .6; cursor: progress; }

/* ---------- 랙(패널) 공통 ---------- */

.console { display: flex; flex-direction: column; gap: 1.1rem; }

.rack {
  position: relative;
  border-radius: 14px;
  padding: 1.05rem 1.15rem 1.15rem;
  background:
    linear-gradient(180deg, rgba(255,255,255,.035), rgba(0,0,0,.12)),
    var(--panel);
  border: 1px solid var(--edge-soft);
  box-shadow: 0 1px 0 rgba(255,255,255,.05) inset, 0 8px 22px rgba(0,0,0,.45);
}
/* 패널 나사 */
.rack::before, .rack::after {
  content: ""; position: absolute; top: 10px; width: 9px; height: 9px; border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #6a717c, #23272e 70%);
  box-shadow: inset 0 0 0 1px #0a0b0d, 0 1px 1px rgba(255,255,255,.08);
}
.rack::before { left: 10px; }
.rack::after { right: 10px; }

.rack__title {
  margin: 0 0 .85rem;
  font-size: .76rem; letter-spacing: .22em; text-transform: uppercase;
  color: #9fa6b1;
  text-shadow: 0 1px 0 rgba(255,255,255,.07), 0 -1px 0 var(--engrave);
  display: flex; align-items: center; gap: .55rem;
}
.rack__tag {
  font-size: .64rem; letter-spacing: .12em; color: var(--led-amber);
  border: 1px solid rgba(240,138,46,.4); border-radius: 999px; padding: .1rem .5rem;
}

.rack__body { display: grid; gap: 1rem; }
.rack__body--transport { grid-template-columns: minmax(230px, 1.3fr) auto minmax(230px, 1fr); align-items: center; }
.rack__body--rhythm { grid-template-columns: auto 1fr auto; align-items: center; }
.rack__body--setup { grid-template-columns: minmax(220px, 1fr) minmax(200px, 1fr) minmax(200px, 1fr); align-items: start; }

/* ---------- 표시창 ---------- */

.readout {
  padding: .7rem .8rem;
  border-radius: 8px;
  background: var(--engrave);
  box-shadow: inset 0 2px 6px rgba(0,0,0,.75), 0 1px 0 rgba(255,255,255,.05);
}
.readout__row { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
.readout__k { font-size: .72rem; letter-spacing: .1em; color: var(--ink-dim); }
.readout__v { font-family: var(--mono); font-size: 1rem; color: #9fe8c4; text-shadow: 0 0 8px rgba(51,193,132,.35); }

.posbar {
  position: relative;
  margin-top: .55rem; height: 12px; border-radius: 3px;
  background: #0a0b0d; overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0,0,0,.9);
}
.posbar__fill {
  position: absolute; inset: 0 auto 0 0; width: 0;
  background: linear-gradient(90deg, #2a8f63, var(--led-green));
  box-shadow: 0 0 10px rgba(51,193,132,.5);
}
.posbar__grid { position: absolute; inset: 0; display: flex; }
.posbar__grid span { flex: 1; border-right: 1px solid rgba(255,255,255,.14); }
.posbar__grid span:last-child { border-right: 0; }
.posbar__grid span[data-accent="1"] { border-right-color: rgba(255,255,255,.34); }

.hint { margin: .5rem 0 0; font-size: .76rem; color: var(--ink-dim); }

/* ---------- 버튼 ---------- */

.btnset { display: flex; gap: .5rem; flex-wrap: wrap; }
.btnset--col { flex-direction: column; align-items: stretch; }

.key {
  font: inherit; font-size: .85rem; font-weight: 600; color: var(--ink);
  padding: .55rem .8rem;
  border-radius: 7px;
  background: linear-gradient(180deg, #3a404a, #272c34);
  border: 1px solid #454c57;
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(255,255,255,.12) inset, 0 3px 0 #171a1f, 0 5px 10px rgba(0,0,0,.4);
  transition: transform .05s, box-shadow .05s, filter .1s;
  white-space: nowrap;
}
.key--wide { min-width: 8.5rem; }
.key:hover:not(:disabled) { filter: brightness(1.12); }
.key:active:not(:disabled) { transform: translateY(2px); box-shadow: 0 1px 0 rgba(255,255,255,.1) inset, 0 1px 0 #171a1f; }
.key:disabled { opacity: .38; cursor: not-allowed; }
.key--danger { color: #ffc9ca; border-color: #6d3033; background: linear-gradient(180deg, #4a2b2d, #331e20); box-shadow: 0 1px 0 rgba(255,255,255,.1) inset, 0 3px 0 #1c1011, 0 5px 10px rgba(0,0,0,.4); }

.tog {
  font: inherit; font-size: .8rem; font-weight: 600; color: var(--ink-mid);
  padding: .45rem .7rem;
  border-radius: 6px;
  background: linear-gradient(180deg, #31363e, #22262c);
  border: 1px solid #434a55;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: .45rem;
  box-shadow: 0 1px 0 rgba(255,255,255,.1) inset, 0 2px 0 #14171b;
  transition: .12s;
}
.tog::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: var(--led-off); box-shadow: inset 0 0 0 1px rgba(0,0,0,.6);
}
.tog:hover { filter: brightness(1.12); }
.tog[aria-pressed="true"] {
  color: #17140f;
  background: linear-gradient(180deg, #ffbc6d, #e58a2c);
  border-color: #a85c14;
  box-shadow: 0 1px 0 rgba(255,255,255,.4) inset, 0 0 12px rgba(240,138,46,.35);
}
.tog[aria-pressed="true"]::before { background: #fff3e0; box-shadow: 0 0 6px #fff; }
.tog--solo[aria-pressed="true"] {
  background: linear-gradient(180deg, #7fd8ff, #3d9bd6);
  border-color: #226b96;
  box-shadow: 0 1px 0 rgba(255,255,255,.4) inset, 0 0 12px rgba(79,154,214,.4);
}

/* ---------- 슬라이더(페이더) ---------- */

.fader { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: .6rem; }
.fader__label { font-size: .74rem; letter-spacing: .1em; color: var(--ink-dim); white-space: nowrap; }
.fader__val { font-family: var(--mono); font-size: .78rem; color: var(--ink-mid); min-width: 3ch; text-align: right; }
.fader--slim .fader__label { font-size: .7rem; }
.fader--master { min-width: 15rem; }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 22px; background: transparent; cursor: pointer; margin: 0;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px; border-radius: 3px;
  background: #0a0b0d;
  box-shadow: inset 0 1px 3px rgba(0,0,0,.9), 0 1px 0 rgba(255,255,255,.06);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 26px; margin-top: -10px; border-radius: 4px;
  background: linear-gradient(180deg, #d8dde4 0 45%, #8d949e 46% 55%, #cfd4db 56%);
  border: 1px solid #2a2e35;
  box-shadow: 0 2px 4px rgba(0,0,0,.6);
}
input[type="range"]::-moz-range-track {
  height: 6px; border-radius: 3px; background: #0a0b0d;
  box-shadow: inset 0 1px 3px rgba(0,0,0,.9);
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 26px; border-radius: 4px;
  background: linear-gradient(180deg, #d8dde4 0 45%, #8d949e 46% 55%, #cfd4db 56%);
  border: 1px solid #2a2e35;
}

.mini { display: inline-flex; align-items: center; gap: .45rem; font-size: .76rem; color: var(--ink-dim); }
.mini select, input[type="number"] {
  font: inherit; color: var(--ink);
  background: var(--engrave); border: 1px solid var(--edge-soft);
  border-radius: 6px; padding: .35rem .5rem;
  box-shadow: inset 0 2px 5px rgba(0,0,0,.7);
}

/* ---------- 리듬 ---------- */

.tempo { display: flex; flex-direction: column; gap: .5rem; min-width: 13rem; }
.tempo__num { display: flex; align-items: baseline; gap: .4rem; }
.tempo__num input {
  width: 5.5rem; font-family: var(--mono); font-size: 1.5rem; text-align: center;
  color: #9fe8c4; text-shadow: 0 0 8px rgba(51,193,132,.35);
}
.tempo__unit { font-size: .72rem; letter-spacing: .14em; color: var(--ink-dim); }

.rhythm__opts { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; }
.rhythm__opts .fader { min-width: 12rem; }

.countin {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-width: 6.5rem; padding: .5rem .7rem; border-radius: 8px;
  background: var(--engrave); box-shadow: inset 0 2px 6px rgba(0,0,0,.8);
}
.countin__cap { font-size: .66rem; letter-spacing: .14em; color: var(--ink-dim); }
.countin__num { font-family: var(--mono); font-size: 1.9rem; line-height: 1.1; color: #4a5059; }
.countin[data-on="true"] .countin__num { color: var(--led-red); text-shadow: 0 0 14px rgba(229,72,77,.6); }

/* ---------- 트랙 데스크 ---------- */

.desk {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.track {
  --accent: var(--led-off);
  display: flex; flex-direction: column; gap: .75rem;
  padding: .9rem .85rem 1rem;
  border-radius: 14px;
  background: linear-gradient(180deg, #262b33, #1b1f25);
  border: 1px solid var(--edge-soft);
  box-shadow: 0 1px 0 rgba(255,255,255,.06) inset, 0 8px 22px rgba(0,0,0,.45);
  transition: border-color .15s, box-shadow .15s;
}
.track[data-selected="true"] {
  border-color: var(--led-amber);
  box-shadow: 0 0 0 1px rgba(240,138,46,.45), 0 1px 0 rgba(255,255,255,.08) inset, 0 8px 26px rgba(0,0,0,.5);
}

.track[data-state="armed"]       { --accent: var(--led-amber); }
.track[data-state="recording"]   { --accent: var(--led-red); }
.track[data-state="overdubbing"] { --accent: var(--led-amber); }
.track[data-state="playing"]     { --accent: var(--led-green); }
.track[data-state="stopped"]     { --accent: var(--led-blue); }

.track__top { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.track__no {
  font-family: var(--mono); font-size: 1.05rem; font-weight: 700; color: var(--ink-mid);
  width: 1.9rem; height: 1.9rem; display: grid; place-items: center;
  border-radius: 6px; background: var(--engrave);
  box-shadow: inset 0 2px 5px rgba(0,0,0,.8);
}
.track__badge {
  display: inline-flex; align-items: center; gap: .4rem;
  font-size: .74rem; font-weight: 700; letter-spacing: .02em;
  padding: .26rem .55rem; border-radius: 999px;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
/* 상태는 색뿐 아니라 글자와 기호로도 구분된다 */
.track__glyph { font-size: .8rem; line-height: 1; }
.track__state { white-space: nowrap; }

.track__stage { position: relative; display: grid; place-items: center; padding: .15rem 0; }

.ring { width: min(168px, 62vw); height: auto; transform: rotate(-90deg); }
.ring__bg { fill: none; stroke: #101318; stroke-width: 9; }
.ring__fg {
  fill: none; stroke: var(--accent); stroke-width: 9; stroke-linecap: round;
  stroke-dasharray: 326.7; stroke-dashoffset: 326.7;
  filter: drop-shadow(0 0 5px color-mix(in srgb, var(--accent) 60%, transparent));
}

/* 풋스위치 */
.pedal {
  position: absolute;
  width: min(116px, 43vw); aspect-ratio: 1; border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: .1rem;
  font: inherit; color: var(--ink); cursor: pointer;
  background:
    radial-gradient(circle at 50% 22%, rgba(255,255,255,.18), transparent 55%),
    linear-gradient(180deg, #454c57, #262b32);
  border: 2px solid #12151a;
  box-shadow:
    0 0 0 4px #1a1e24, 0 0 0 5px #0b0d10,
    0 8px 0 #101317, 0 14px 22px rgba(0,0,0,.6);
  transition: transform .06s, box-shadow .06s, background .2s;
}
.pedal:hover:not(:disabled) { filter: brightness(1.1); }
.pedal:active:not(:disabled), .track[data-state="recording"] .pedal, .track[data-state="overdubbing"] .pedal {
  transform: translateY(5px);
  box-shadow: 0 0 0 4px #1a1e24, 0 0 0 5px #0b0d10, 0 3px 0 #101317, 0 6px 12px rgba(0,0,0,.55);
}
.pedal:disabled { opacity: .45; cursor: not-allowed; }
.pedal__label { font-size: 1.02rem; font-weight: 800; letter-spacing: .02em; }
.pedal__hint { font-size: .66rem; color: var(--ink-dim); letter-spacing: .02em; }

.track[data-state="recording"] .pedal,
.track[data-state="overdubbing"] .pedal,
.track[data-state="armed"] .pedal {
  background: radial-gradient(circle at 50% 22%, rgba(255,255,255,.2), transparent 55%),
              linear-gradient(180deg, color-mix(in srgb, var(--accent) 70%, #2b3038), color-mix(in srgb, var(--accent) 35%, #1b1f25));
}
.track[data-state="recording"] .pedal__label,
.track[data-state="overdubbing"] .pedal__label { color: #14100c; }
.track[data-state="recording"] .pedal__hint,
.track[data-state="overdubbing"] .pedal__hint { color: rgba(20,16,12,.75); }

.track[data-state="armed"] .pedal { animation: blink 1s steps(2, start) infinite; }
@keyframes blink { 50% { opacity: .55; } }

.track__ops { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .4rem; }
.track__ops .key { font-size: .78rem; padding: .5rem .3rem; text-align: center; }

.track__strip {
  display: flex; flex-direction: column; gap: .55rem;
  padding-top: .6rem; border-top: 1px solid var(--edge-soft);
}
.track__toggles { display: flex; align-items: center; gap: .4rem; flex-wrap: wrap; }
.track__layers {
  margin-left: auto; font-family: var(--mono); font-size: .72rem; color: var(--ink-dim);
}
.track[data-muted="true"] { opacity: .78; }
.track[data-muted="true"] .ring__fg { stroke-dasharray: 10 8; }

/* ---------- 믹스다운 ---------- */

.knobset { display: flex; flex-direction: column; gap: .7rem; }
.mixdown { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }

/* ---------- 단축키 ---------- */

.rack--keys .keys {
  margin: 0; padding: 0; list-style: none;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: .4rem .9rem;
  font-size: .82rem; color: var(--ink-mid);
}
kbd {
  font-family: var(--mono); font-size: .74rem;
  padding: .1rem .4rem; margin-right: .15rem;
  border-radius: 4px; color: var(--ink);
  background: linear-gradient(180deg, #3a404a, #272c34);
  border: 1px solid #4a515c; box-shadow: 0 2px 0 #14171b;
}

/* ---------- 푸터 ---------- */

.foot { text-align: center; color: var(--ink-dim); font-size: .78rem; margin-top: .5rem; }
.foot p { margin: .15rem 0; }
.foot__note { opacity: .75; }

/* ---------- 반응형 ---------- */

@media (max-width: 1080px) {
  .desk { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rack__body--transport { grid-template-columns: 1fr; }
  .rack__body--rhythm { grid-template-columns: 1fr; }
  .rack__body--setup { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .desk { grid-template-columns: 1fr; }
  .rack__body--setup { grid-template-columns: 1fr; }
  .head { justify-content: center; text-align: center; }
  .head__io { min-width: 0; width: 100%; }
  .track__ops { grid-template-columns: repeat(2, 1fr); }
  .ring { width: min(200px, 58vw); }
  .pedal { width: min(138px, 40vw); }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}