:root {
  --bg: #101217;
  --panel: #181B22;
  --raise: #1F232C;
  --line: #2C303B;
  --line-soft: #23262F;
  --text: #E9EAEE;
  --text-2: #C9CCD6;
  --muted: #A3A7B3;
  --faint: #8A8F9C;
  --accent: #FF6B2C;
  --accent-soft: rgba(255, 107, 44, 0.16);
  --paper: #F4F1EA;
  --ink: #1C1C22;
  --ink-2: #5A554D;
  --hot-ink: #C2410C;
  --sl: env(safe-area-inset-left, 0px);
  --sr: env(safe-area-inset-right, 0px);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font-family: Inter, system-ui, -apple-system, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
button, select { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { opacity: 0.35; cursor: default; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Library ---------- */

.library {
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px max(16px, var(--sr)) 40px max(16px, var(--sl));
}
.lhead { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--accent); }
.brand h1 {
  margin: 0;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 26px;
  color: var(--text);
  letter-spacing: -0.01em;
}
.lhead p { margin: 0; color: var(--muted); font-size: 14px; max-width: 640px; line-height: 1.45; }

.filters { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 10px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button {
  border: 0;
  background: none;
  color: var(--text-2);
  padding: 0 12px;
  min-height: 38px;
  font-size: 13px;
  white-space: nowrap;
}
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--raise); color: #fff; font-weight: 600; }
.select select {
  appearance: none;
  -webkit-appearance: none;
  min-height: 40px;
  padding: 0 34px 0 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23A3A7B3' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 12px center;
  font-size: 13px;
}
.count { color: var(--faint); font-size: 13px; margin-left: auto; }
.levels {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 4px;
  margin-bottom: 6px;
  scrollbar-width: none;
}
.levels::-webkit-scrollbar { display: none; }
.levels button {
  flex: none;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: none;
  color: var(--text-2);
  font-weight: 600;
  font-size: 14px;
}
.levels button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #15110E; }

.lvl-sec h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 18px;
  margin: 22px 0 10px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.lvl-sec h2 span { font-family: Inter, sans-serif; font-size: 12px; font-weight: 500; color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid var(--line-soft);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: #4A4F5C; }
.card:active { transform: scale(0.99); }
.card-top { display: flex; justify-content: space-between; align-items: center; }
.tag { font-size: 11px; font-weight: 600; letter-spacing: 0.04em; padding: 3px 8px; border-radius: 6px; text-transform: uppercase; }
.tag.groove { color: #9CCBF0; background: rgba(79, 163, 224, 0.14); }
.tag.fill { color: #FFB48F; background: rgba(255, 107, 44, 0.14); }
.tag.combo { color: #C7B5FF; background: rgba(160, 124, 255, 0.16); }
.card-bpm { font-size: 12px; color: var(--faint); }
.card-name { font-size: 16px; font-weight: 600; color: #F2F3F6; }
.card-meta { font-size: 12px; color: var(--muted); margin-top: -4px; }
.pv { display: block; height: 48px; border-radius: 6px; background: #13161C; overflow: hidden; }
.pv svg { width: 100%; height: 100%; display: block; }
.pv-bar { fill: #3A3F4B; }
.meter { display: flex; gap: 3px; }
.meter i { width: 14px; height: 4px; border-radius: 2px; background: var(--line); }
.meter i.on { background: var(--accent); }
.empty { color: var(--muted); padding: 40px 0; text-align: center; }
.lfoot { margin-top: 32px; color: var(--faint); font-size: 13px; }

/* ---------- Player ---------- */

.player {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
}
.pbar {
  position: relative;
  flex: none;
  display: flex;
  align-items: center;
  gap: 6px;
  height: 52px;
  padding: 0 max(8px, var(--sr)) 0 max(8px, var(--sl));
  padding-top: env(safe-area-inset-top, 0px);
  height: calc(52px + env(safe-area-inset-top, 0px));
  border-bottom: 1px solid var(--line-soft);
}
.ib {
  flex: none;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: none;
  border-radius: 10px;
  color: var(--text);
}
.ib.sm { width: 34px; height: 38px; }
.ib:hover:not(:disabled) { background: var(--raise); }
.ptitle { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.pname {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 16px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.pmeta { font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.box { flex: none; display: flex; align-items: center; border: 1px solid var(--line); border-radius: 10px; height: 40px; }
.lv { display: flex; align-items: baseline; gap: 2px; min-width: 30px; justify-content: center; }
.lv small { font-size: 10px; color: var(--muted); }
.lv b { font-family: 'Space Grotesk', sans-serif; font-size: 16px; }
.bpm { display: flex; flex-direction: column; align-items: center; min-width: 44px; line-height: 1; }
.bpm b { font-family: 'Space Grotesk', sans-serif; font-size: 17px; }
.bpm small { font-size: 9px; color: var(--muted); letter-spacing: 0.06em; margin-top: 2px; }
.tg {
  flex: none;
  display: flex;
  align-items: center;
  gap: 6px;
  height: 40px;
  min-width: 40px;
  padding: 0 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: none;
  color: var(--muted);
}
.tg[aria-pressed="true"] { color: #fff; border-color: var(--accent); background: var(--accent-soft); }
.tg .tl { font-size: 13px; }
#soundBtn[aria-pressed="true"] .i-off,
#soundBtn[aria-pressed="false"] .i-on,
#metroBtn[aria-pressed="true"] .i-slash { display: none; }
.play {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 0;
  background: var(--accent);
  color: #15110E;
  display: flex;
  align-items: center;
  justify-content: center;
}
.play .i-stop, .play.playing .i-play { display: none; }
.play.playing .i-stop { display: block; }

.menu {
  position: absolute;
  top: calc(100% + 6px);
  right: max(8px, var(--sr));
  z-index: 20;
  width: min(340px, calc(100vw - 16px));
  max-height: calc(100dvh - 70px);
  overflow-y: auto;
  padding: 14px;
  border-radius: 14px;
  background: var(--raise);
  border: 1px solid var(--line);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.menu-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--text-2); }
.menu .seg button { min-height: 34px; padding: 0 10px; }
.switch {
  flex: none;
  width: 46px;
  height: 28px;
  border-radius: 14px;
  border: 0;
  background: var(--line);
  position: relative;
  padding: 0;
}
.switch i { position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: #fff; transition: transform 0.15s; }
.switch[aria-pressed="true"] { background: var(--accent); }
.switch[aria-pressed="true"] i { transform: translateX(18px); }
.link { border: 0; background: none; color: var(--accent); padding: 8px 0; font-size: 13px; font-weight: 600; }
.hint { display: block; font-size: 11px; color: var(--faint); margin-top: 2px; }
.sync { min-width: 54px; text-align: center; font-size: 13px; font-variant-numeric: tabular-nums; }
.tip { margin: 0; padding-top: 10px; border-top: 1px solid var(--line); font-size: 13px; color: var(--text-2); line-height: 1.45; }

.stage {
  position: relative;
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 6px max(8px, var(--sr)) max(8px, env(safe-area-inset-bottom, 0px)) max(8px, var(--sl));
}
.panel { position: relative; min-height: 0; border-radius: 10px; overflow: hidden; }
.panel svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.paper { flex: 0 0 42%; background: var(--paper); color: var(--ink); }
.lanes { flex: 1 1 auto; background: var(--panel); }
.stage[data-view="notes"] .lanes,
.stage[data-view="lanes"] .paper { display: none; }
.stage[data-view="notes"] .paper { flex: 1 1 auto; }

.playhead {
  position: absolute;
  top: 2px;
  bottom: max(6px, env(safe-area-inset-bottom, 0px));
  left: max(8px, var(--sl));
  width: 2px;
  margin-left: -1px;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  pointer-events: none;
  will-change: transform;
}
.playhead::before {
  content: '';
  position: absolute;
  top: 0;
  left: -5px;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 8px solid var(--accent);
}
.countin {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: min(36vh, 160px);
  color: var(--accent);
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.6);
  pointer-events: none;
}
.looptext {
  position: absolute;
  right: calc(max(8px, var(--sr)) + 8px);
  bottom: calc(max(8px, env(safe-area-inset-bottom, 0px)) + 4px);
  font-size: 11px;
  color: var(--faint);
  pointer-events: none;
}
.rotate {
  position: absolute;
  left: 50%;
  top: 12px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 6px 6px 12px;
  width: max-content;
  max-width: calc(100% - 24px);
  border-radius: 12px;
  background: var(--raise);
  border: 1px solid var(--line);
  font-size: 13px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  z-index: 5;
}

/* Notation */
.paper .staff { fill: #6B6760; }
.paper .ink { fill: var(--ink); }
.paper .ho { fill: currentColor; }
.paper .hx { stroke: currentColor; fill: none; stroke-linecap: round; }
.paper .nh { color: var(--ink); }
.paper .nh.on { animation: ink-flash 0.32s ease-out; }
.paper .flag, .paper .rest { stroke: var(--ink); fill: none; stroke-linecap: round; stroke-linejoin: round; }
.paper .tsig {
  font-family: Georgia, 'Times New Roman', serif;
  font-weight: 700;
  fill: var(--ink);
  text-anchor: middle;
  dominant-baseline: central;
}
.paper .tup { font-family: Georgia, serif; font-style: italic; font-weight: 700; fill: var(--ink); text-anchor: middle; dominant-baseline: central; }
.paper .sec { font-size: 10px; font-weight: 700; letter-spacing: 0.1em; fill: var(--ink-2); }
.paper .sec.fill { fill: var(--hot-ink); }
.paper .secline { fill: #B9B3A8; }
.paper .secline.fill { fill: var(--hot-ink); }
.paper .stk { font-size: 11px; font-weight: 700; fill: var(--ink-2); text-anchor: middle; }
.paper .stk.on { animation: stk-flash 0.32s ease-out; }

/* Lanes */
.lanes .band { fill: transparent; }
.lanes .band.alt { fill: rgba(255, 255, 255, 0.025); }
.lanes .barline { fill: #444957; }
.lanes .beatline { fill: #262A33; }
.lanes .rowline { fill: #23262F; }
.lanes .filltint { fill: rgba(255, 107, 44, 0.06); }
.lanes .cnt { font-size: 9px; fill: var(--faint); text-anchor: middle; }
.lanes .cnt.strong { font-size: 11px; font-weight: 700; fill: var(--text); }
.lanes .cnt.on { animation: cnt-flash 0.32s ease-out; }
.lanes .pos { font-size: 11px; font-weight: 600; fill: var(--muted); }
.lanes .lname { font-size: 12px; fill: var(--text-2); dominant-baseline: central; }
.lanes .lname.on { animation: name-flash 0.32s ease-out; }
.lanes .ldot.on { animation: dot-flash 0.32s ease-out; }
.lanes .hit { fill: var(--c); transform-box: fill-box; transform-origin: center; }
.lanes .hit.ghost { opacity: 0.5; }
.lanes .hit.open { fill: none; stroke: var(--c); stroke-width: 2; }
.lanes .hit.on { animation: hit-flash 0.32s ease-out; }

/* Lit elements flash at the moment of the hit and fade, so the light never
   lingers behind the playhead. */
@keyframes hit-flash {
  from { stroke: #fff; stroke-width: 2.5px; transform: scale(1.3); opacity: 1; }
  to { stroke: rgba(255, 255, 255, 0); stroke-width: 2.5px; transform: scale(1); }
}
@keyframes ink-flash { from { color: var(--hot-ink); } to { color: var(--ink); } }
@keyframes stk-flash { from { fill: var(--hot-ink); } to { fill: var(--ink-2); } }
@keyframes cnt-flash { from { fill: var(--accent); } }
@keyframes name-flash { from { fill: #fff; } to { fill: var(--text-2); } }
@keyframes dot-flash { from { stroke: #fff; stroke-width: 3px; } to { stroke: rgba(255, 255, 255, 0); stroke-width: 3px; } }

@media (min-width: 1000px) {
  .pbar { height: calc(60px + env(safe-area-inset-top, 0px)); gap: 10px; padding-left: 16px; padding-right: 16px; }
  .pname { font-size: 19px; }
  .pmeta { font-size: 12px; }
  .stage { gap: 10px; padding: 10px 16px 16px; }
  .playhead { left: 16px; top: 6px; bottom: 16px; }
  .paper .sec { font-size: 11px; }
  .lanes .lname { font-size: 13px; }
}
@media (max-width: 999px) {
  .tg .tl { display: none; }
  .tg { padding: 0; justify-content: center; }
}
@media (max-width: 560px) {
  .pmeta, .level { display: none; }
}
@media (max-height: 420px) {
  .pbar { height: calc(46px + env(safe-area-inset-top, 0px)); }
  .stage { padding-top: 4px; gap: 4px; }
}