:root {
  --bg: #08080a;
  --panel: #0f0f12;
  --panel-2: #15151a;
  --panel-3: #1c1c22;
  --line: rgba(255, 255, 255, 0.06);
  --line-2: rgba(255, 255, 255, 0.11);
  --text: #ececf1;
  --muted: #8b8b97;
  --faint: #55555f;
  --accent: #ffcf3e;
  --accent-ink: #1b1500;
  --radius: 10px;
  --sidebar: 328px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { height: 100%; margin: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 500 13px/1.4 Inter, ui-sans-serif, system-ui, sans-serif;
  font-feature-settings: 'cv11', 'ss03';
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }

.app {
  display: grid;
  grid-template-rows: 56px 1fr;
  height: 100%;
  opacity: 0;
  transition: opacity 0.5s var(--ease);
}
.is-ready .app { opacity: 1; }

/* ------------------------------------------------------------------ topbar */

.topbar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px 0 18px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { width: 20px; height: 20px; }
.brand-name { font-weight: 600; letter-spacing: -0.01em; }

.top-actions { display: flex; align-items: center; gap: 8px; }

.mode-switch {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
}
.mode-switch button { height: 28px; font-size: 12.5px; font-weight: 600; }

/* ------------------------------------------------------------------ buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 32px;
  padding: 0 14px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--panel-2);
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s, color 0.15s, transform 0.1s;
}
.btn:hover { background: var(--panel-3); border-color: rgba(255, 255, 255, 0.16); }
.btn:active { transform: scale(0.97); }
.btn:focus-visible, .switch:focus-visible, .segmented button:focus-visible, .field-value:focus-visible {
  outline: 2px solid rgba(255, 207, 62, 0.6);
  outline-offset: 2px;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
.btn.primary:hover { background: #ffd95e; border-color: #ffd95e; }

.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.ghost:hover { background: rgba(255, 255, 255, 0.05); color: var(--text); }

.btn.icon { width: 32px; padding: 0; }
.btn.small { height: 28px; padding: 0 10px; font-size: 12px; }
.btn-row { display: flex; gap: 4px; }

.select { position: relative; }
.select select {
  appearance: none;
  height: 32px;
  padding: 0 30px 0 12px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--panel-2);
  cursor: pointer;
}
.select select:hover { border-color: rgba(255, 255, 255, 0.16); }
.select::after {
  content: '';
  position: absolute;
  right: 12px;
  top: 50%;
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}
.field .select select { height: 28px; font-size: 12px; }

/* ---------------------------------------------------------------- workspace */

.workspace {
  display: grid;
  grid-template-columns: 1fr var(--sidebar);
  min-height: 0;
}

.viewer {
  display: grid;
  grid-template-rows: 1fr auto;
  min-width: 0;
  min-height: 0;
  background:
    radial-gradient(1200px 600px at 50% 40%, rgba(255, 255, 255, 0.025), transparent 70%),
    var(--bg);
}

.stage-wrap {
  position: relative;
  min-width: 0;
  min-height: 0;
  margin: 28px 32px 18px;
}

#stage {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: block;
  border-radius: 10px;
  background: #000;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.06),
    0 30px 80px -20px rgba(0, 0, 0, 0.8),
    0 10px 30px -10px rgba(0, 0, 0, 0.6);
}

.boot-error {
  position: absolute;
  inset: auto 0 50% 0;
  text-align: center;
  color: var(--muted);
}

/* ---------------------------------------------------------------- transport */

.transport {
  display: grid;
  grid-template-columns: auto auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 12px 22px 18px;
}

.transport-buttons { display: flex; gap: 4px; align-items: center; }

.btn.play {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--text);
  border-color: var(--text);
  color: #0b0b0d;
}
.btn.play:hover { background: #fff; border-color: #fff; }
.btn.play .i-pause, .btn.play.is-playing .i-play { display: none; }
.btn.play.is-playing .i-pause { display: block; }
.btn.play .i-play { transform: translateX(1px); }

#loop.is-active { color: var(--accent); }
#mute .i-muted, #mute.is-muted .i-sound { display: none; }
#mute.is-muted .i-muted { display: block; }
#mute.is-muted { color: var(--text); }

.time {
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  color: var(--text);
  white-space: nowrap;
}
.time-sep { margin: 0 6px; color: var(--faint); }
#dur { color: var(--muted); }

.timeline {
  position: relative;
  height: 44px;
  cursor: pointer;
  touch-action: none;
  user-select: none;
}

.timeline-track {
  position: absolute;
  inset: 0;
  border-radius: 8px;
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 5%),
    rgba(255, 255, 255, 0.025);
  border: 1px solid var(--line);
}

.segments {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

.seg {
  position: absolute;
  height: 13px;
  padding: 0 5px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--muted);
  font-size: 9.5px;
  font-weight: 600;
  line-height: 13px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: clip;
  transition: background 0.2s, color 0.2s;
}
.seg.is-active { background: rgba(255, 207, 62, 0.16); color: var(--accent); }
.seg-hold { background: transparent; border: 1px dashed rgba(255, 255, 255, 0.08); line-height: 11px; }
.seg-hold.is-active { background: rgba(255, 255, 255, 0.04); color: var(--text); }

.playhead {
  position: absolute;
  top: -4px;
  bottom: -4px;
  width: 2px;
  margin-left: -1px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(255, 207, 62, 0.45);
  pointer-events: none;
}
.playhead::before {
  content: '';
  position: absolute;
  top: -3px;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--accent);
  transform: translateX(-50%);
}

/* ------------------------------------------------------------------ sidebar */

.sidebar {
  display: grid;
  grid-template-rows: 1fr auto;
  min-height: 0;
  border-left: 1px solid var(--line);
  background: var(--panel);
}

.sidebar-scroll {
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.12) transparent;
}

.sidebar-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px 10px 18px;
  border-top: 1px solid var(--line);
}
.shortcuts { color: var(--faint); font-size: 11px; }
kbd {
  display: inline-block;
  min-width: 18px;
  padding: 1px 4px;
  margin: 0 1px;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  font: 500 10px/1.4 Inter, sans-serif;
  text-align: center;
  color: var(--muted);
}

.section { border-bottom: 1px solid var(--line); }

.section summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 18px;
  list-style: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  user-select: none;
}
.section summary::-webkit-details-marker { display: none; }
.section summary:hover { color: var(--text); }
.section summary svg { transition: transform 0.2s var(--ease); }
.section:not([open]) summary svg { transform: rotate(-90deg); }

.section-body {
  display: grid;
  gap: 16px;
  padding: 0 18px 20px;
}

.field { display: grid; gap: 8px; }
.field.row {
  grid-template-columns: 1fr auto;
  align-items: center;
}
.field.is-off textarea, .field.is-off input[type='text'] { opacity: 0.35; }

.field-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 18px;
}
.field-label { color: #c5c5ce; font-size: 12.5px; }

.field-value {
  padding: 1px 6px;
  margin-right: -6px;
  border: 0;
  border-radius: 5px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.field-value.is-changed { color: var(--accent); }
.field-value.is-changed:hover { background: rgba(255, 207, 62, 0.1); }
.field-value:not(.is-changed) { cursor: default; }

.hint { margin: -2px 0 0; color: var(--faint); font-size: 11.5px; line-height: 1.45; }

textarea, input[type='text'] {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--panel-2);
  line-height: 1.45;
  resize: vertical;
  transition: border-color 0.15s, background 0.15s, opacity 0.2s;
}
textarea:hover, input[type='text']:hover { border-color: rgba(255, 255, 255, 0.16); }
textarea:focus, input[type='text']:focus {
  outline: none;
  border-color: rgba(255, 207, 62, 0.55);
  background: #18181d;
}

/* Range */
input[type='range'] {
  --p: 50%;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 16px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}
input[type='range']::-webkit-slider-runnable-track {
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(to right, #d9d9e0 0 var(--p), rgba(255, 255, 255, 0.1) var(--p) 100%);
}
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 13px;
  height: 13px;
  margin-top: -5px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(8, 8, 10, 0.9), 0 1px 4px rgba(0, 0, 0, 0.5);
  transition: transform 0.15s var(--ease);
}
input[type='range']:hover::-webkit-slider-thumb { transform: scale(1.12); }
input[type='range']:active::-webkit-slider-thumb { transform: scale(1.25); }
input[type='range']::-moz-range-track { height: 3px; border-radius: 3px; background: rgba(255, 255, 255, 0.1); }
input[type='range']::-moz-range-progress { height: 3px; border-radius: 3px; background: #d9d9e0; }
input[type='range']::-moz-range-thumb { width: 13px; height: 13px; border: 0; border-radius: 50%; background: #fff; }
input[type='range']:focus-visible { outline: none; }
input[type='range']:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px rgba(255, 207, 62, 0.45); }

/* Color */
.swatches { display: flex; gap: 6px; }
input[type='color'] {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: none;
  cursor: pointer;
}
input[type='color']::-webkit-color-swatch-wrapper { padding: 0; }
input[type='color']::-webkit-color-swatch { border: 1px solid var(--line-2); border-radius: 7px; }
input[type='color']::-moz-color-swatch { border: 1px solid var(--line-2); border-radius: 7px; }

/* Switch */
.switch {
  position: relative;
  width: 30px;
  height: 18px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  transition: background 0.2s var(--ease);
  flex: none;
}
.switch-knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  transition: transform 0.2s var(--ease);
}
.switch[aria-checked='true'] { background: var(--accent); }
.switch[aria-checked='true'] .switch-knob { transform: translateX(12px); }

/* Segmented */
.segmented {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--panel-2);
}
.segmented button {
  height: 26px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  transition: background 0.15s, color 0.15s;
}
.segmented button:hover { color: var(--text); }
.segmented button.is-active { background: var(--panel-3); color: var(--text); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4); }

/* -------------------------------------------------------------------- modal */

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(4, 4, 6, 0.6);
  backdrop-filter: blur(8px);
  z-index: 10;
  animation: fade 0.2s var(--ease);
}
.modal-card {
  width: min(380px, calc(100vw - 32px));
  padding: 20px;
  border: 1px solid var(--line-2);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}
.modal-head { display: flex; justify-content: space-between; align-items: baseline; }
.modal-head h2 { margin: 0; font-size: 14px; font-weight: 600; }
.modal-pct { font-variant-numeric: tabular-nums; color: var(--muted); }
.progress { height: 4px; margin: 16px 0 10px; border-radius: 4px; background: rgba(255, 255, 255, 0.08); overflow: hidden; }
.progress-bar { height: 100%; width: 0; border-radius: 4px; background: var(--accent); transition: width 0.15s linear; }
.modal-status { margin: 0; color: var(--muted); font-size: 12px; }
.modal.is-error .modal-status { color: #ff8a7a; }
.modal.is-error .progress-bar { background: #ff8a7a; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
a.btn { text-decoration: none; }

@keyframes fade { from { opacity: 0; } }

@media (max-width: 860px) {
  body { overflow: auto; }
  .app { height: auto; min-height: 100%; }
  .workspace { grid-template-columns: 1fr; }
  .viewer { min-height: 60vh; }
  .stage-wrap { margin: 16px; min-height: 40vh; }
  .sidebar { border-left: 0; border-top: 1px solid var(--line); }
  .transport { grid-template-columns: auto auto 1fr; padding: 8px 16px 14px; }
  #loop, #mute { display: none; }
  .mode-switch { position: static; transform: none; width: 150px; }
}