/* ============ Beat Sequencer — dark UI ============ */

:root {
  --bg: #0c0e13;
  --card: #161922;
  --card-edge: #232837;
  --pad-off: #23262f;
  --pad-off-edge: #2c303b;
  --text: #e9ebf2;
  --muted: #8b93a7;
  --accent: #6d6ef2;
  --accent-deep: #5457e8;
  --track-line: #2b3040;

  --c-kick: #7c6cf8;
  --c-snare: #f2479c;
  --c-hat: #20b6f0;
  --c-blip: #f6d43d;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  min-height: 100vh;
  background:
    radial-gradient(1100px 520px at 18% -10%, rgba(109, 110, 242, 0.14), transparent 60%),
    radial-gradient(900px 480px at 95% 8%, rgba(242, 71, 156, 0.08), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: "Inter", "SF Pro Text", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  display: flex;
  justify-content: center;
  padding: clamp(14px, 4vw, 40px);
}

.app {
  width: 100%;
  max-width: 1120px;
  background: var(--card);
  border: 1px solid var(--card-edge);
  border-radius: 20px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55), 0 2px 0 rgba(255, 255, 255, 0.03) inset;
  padding: clamp(16px, 3vw, 30px);
}

/* ---------- Header ---------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

.title {
  margin: 0;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 800;
  letter-spacing: 0.2px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.ghost-icon {
  width: 1.2em;
  height: 1.2em;
  fill: #f2479c;
  filter: drop-shadow(0 0 6px rgba(242, 71, 156, 0.55));
  flex: none;
}

.ghost-eye { fill: var(--card); }

.bpm-badge {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text);
  background: #1d2130;
  border: 1px solid var(--card-edge);
  border-radius: 999px;
  padding: 7px 16px;
  white-space: nowrap;
}

/* ---------- Matrix ---------- */

.matrix-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
}

.matrix {
  min-width: 660px;
  display: grid;
  gap: 8px;
}

.row {
  display: grid;
  grid-template-columns: 74px repeat(16, minmax(0, 1fr));
  gap: 6px;
  align-items: center;
}

.row[data-track="0"] { --c: var(--c-kick); }
.row[data-track="1"] { --c: var(--c-snare); }
.row[data-track="2"] { --c: var(--c-hat); }
.row[data-track="3"] { --c: var(--c-blip); }

.track-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 1.6px;
  color: var(--muted);
  text-align: right;
  padding-right: 10px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 7px;
  white-space: nowrap;
}

.track-label::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c);
  box-shadow: 0 0 8px var(--c);
  flex: none;
}

.pad {
  --sz: 100%;
  height: clamp(34px, 4.4vw, 46px);
  border: 1px solid var(--pad-off-edge);
  border-radius: 10px;
  background: var(--pad-off);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.35), 0 1px 0 rgba(255, 255, 255, 0.03) inset;
  cursor: pointer;
  padding: 0;
  transition: transform 0.05s ease, background 0.08s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}

.pad:hover { border-color: #3a4052; }

.pad:active { transform: scale(0.93); }

.pad:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* beat-group breathing room: extra gap before steps 4/8/12 */
.pad.gap4 { margin-left: 8px; }

.pad.on {
  background: var(--c);
  border-color: transparent;
  box-shadow:
    0 0 14px color-mix(in srgb, var(--c) 65%, transparent),
    0 0 4px color-mix(in srgb, var(--c) 80%, transparent),
    0 2px 6px rgba(0, 0, 0, 0.35);
}

.pad.ph {
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.18), 0 2px 4px rgba(0, 0, 0, 0.35);
}

.pad.on.ph {
  box-shadow:
    0 0 22px color-mix(in srgb, var(--c) 90%, transparent),
    0 0 8px var(--c),
    0 0 0 2px rgba(255, 255, 255, 0.55),
    0 2px 6px rgba(0, 0, 0, 0.35);
}

/* ---------- Transport ---------- */

.transport {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 18px;
}

.play-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(180deg, #6b6df4, #5255e6);
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  border: none;
  border-radius: 13px;
  padding: 13px 26px;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(93, 95, 232, 0.4), 0 1px 0 rgba(255, 255, 255, 0.18) inset;
  transition: transform 0.06s ease, box-shadow 0.15s ease, filter 0.15s ease;
  flex: none;
}

.play-btn:hover { filter: brightness(1.08); }

.play-btn:active { transform: scale(0.96); }

.play-btn.playing {
  box-shadow: 0 6px 22px rgba(242, 71, 156, 0.45), 0 1px 0 rgba(255, 255, 255, 0.18) inset;
}

.play-icon { display: inline-flex; }

.play-icon svg { width: 15px; height: 15px; fill: currentColor; display: block; }

/* ---------- Sliders ---------- */

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--accent) var(--p, 0%), var(--track-line) var(--p, 0%));
  cursor: pointer;
  margin: 0;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: none;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.5), 0 0 0 3px rgba(109, 110, 242, 0.35);
  transition: transform 0.08s ease;
}

.slider::-webkit-slider-thumb:active { transform: scale(1.15); }

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: none;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.5), 0 0 0 3px rgba(109, 110, 242, 0.35);
}

.slider::-moz-range-track { background: transparent; }

.slider.progress {
  height: 10px;
  flex: 1;
  min-width: 120px;
}

.slider.progress::-webkit-slider-thumb {
  width: 21px;
  height: 21px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.55), 0 0 0 4px rgba(109, 110, 242, 0.3);
}

.slider.progress::-moz-range-thumb {
  width: 21px;
  height: 21px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.55), 0 0 0 4px rgba(109, 110, 242, 0.3);
}

/* ---------- Panels ---------- */

.panels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.panel {
  background: #13161f;
  border: 1px solid var(--card-edge);
  border-radius: 14px;
  padding: 14px 16px;
  align-self: start;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
}

.tempo-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.tap-btn {
  flex: none;
  background: #1d2130;
  color: var(--text);
  border: 1px solid var(--card-edge);
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 9px 14px;
  cursor: pointer;
  transition: background 0.12s ease, transform 0.06s ease, border-color 0.12s ease;
  white-space: nowrap;
}

.tap-btn:hover { background: #232840; }

.tap-btn:active { transform: scale(0.94); }

.tap-btn.tapped {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  background: #1d2130;
  color: var(--text);
  border: 1px solid var(--card-edge);
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 8px 14px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, transform 0.06s ease, color 0.12s ease;
}

.chip:hover { background: #242a42; border-color: #343b5c; }

.chip-icon {
  width: 12px;
  height: 12px;
  fill: currentColor;
  vertical-align: -1px;
  margin-right: 4px;
}

.chip:active { transform: scale(0.95); }

.chip.active {
  background: var(--accent-deep);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 0 12px rgba(109, 110, 242, 0.45);
}

.chip.warn:hover { border-color: #b08a2a; color: #ffd76a; }

.chip.danger:hover { border-color: #b03a5a; color: #ff7d9c; }

.slider-row {
  display: grid;
  grid-template-columns: 76px 1fr 52px;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.slider-row:last-child { margin-bottom: 2px; }

.slider-row label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--muted);
}

.slider-row output {
  font-size: 0.78rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* ---------- Track controls ---------- */

#trackCtls {
  display: grid;
  gap: 9px;
}

.track-ctl {
  display: grid;
  grid-template-columns: 64px 30px 30px 1fr;
  align-items: center;
  gap: 8px;
}

.track-ctl[data-track="0"] { --c: var(--c-kick); }
.track-ctl[data-track="1"] { --c: var(--c-snare); }
.track-ctl[data-track="2"] { --c: var(--c-hat); }
.track-ctl[data-track="3"] { --c: var(--c-blip); }

.tname {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 1.2px;
  color: var(--c);
}

.ms-btn {
  width: 30px;
  height: 26px;
  border-radius: 7px;
  border: 1px solid var(--card-edge);
  background: #1d2130;
  color: var(--muted);
  font-weight: 800;
  font-size: 0.72rem;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.ms-btn:hover { background: #242a42; color: var(--text); }

.ms-btn.mute.on {
  background: #4a2430;
  border-color: #a03a55;
  color: #ff8fa8;
}

.ms-btn.solo.on {
  background: #453a14;
  border-color: #b08a2a;
  color: #ffd76a;
}

.track-ctl .slider { height: 6px; }

.track-ctl .slider::-webkit-slider-thumb {
  width: 14px;
  height: 14px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5), 0 0 0 3px color-mix(in srgb, var(--c) 45%, transparent);
}

.track-ctl .slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.5), 0 0 0 3px color-mix(in srgb, var(--c) 45%, transparent);
}

/* ---------- Footer help ---------- */

.help {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  color: var(--muted);
  font-size: 0.75rem;
}

.help span { display: inline-flex; align-items: center; gap: 5px; }

.help small { opacity: 0.75; }

kbd {
  background: #1d2130;
  border: 1px solid var(--card-edge);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 6px;
  font-family: inherit;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text);
}

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  .app { border-radius: 16px; }
  .transport { flex-direction: column; align-items: stretch; gap: 12px; }
  .play-btn { justify-content: center; width: 100%; }
  .slider-row { grid-template-columns: 70px 1fr 48px; }
  .panels { grid-template-columns: 1fr 1fr; }
  .panel:has(#trackCtls) { grid-column: 1 / -1; }
  .matrix-wrap { scrollbar-width: thin; }
}

@media (max-width: 460px) {
  body { padding: 8px; }
  .app { padding: 14px; }
  .panels { grid-template-columns: 1fr; }
  .bpm-badge { padding: 5px 12px; font-size: 0.8rem; }
  .help { gap: 6px 12px; font-size: 0.7rem; }
}

@media (prefers-reduced-motion: reduce) {
  .pad, .play-btn, .chip, .tap-btn { transition: none; }
}