@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --color-background: #16130F;
  --color-foreground: #F2E9D8;
  --color-card: #211C16;
  --color-card-foreground: #F2E9D8;
  --color-muted: #2A2419;
  --color-muted-foreground: #B8A98C;
  --color-accent: #E08A3C;
  --color-on-accent: #1A1410;
  --color-border: rgba(242, 233, 216, 0.08);
  --color-destructive: #DC2626;
  --color-on-destructive: #FFFFFF;
  --color-ring: #E08A3C;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.32);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.38);

  --sticky-bar-height: 56px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  min-height: 100vh;
}

.mono { font-family: 'JetBrains Mono', monospace; }

.app-header {
  padding: var(--space-lg) var(--space-md) var(--space-md);
  border-bottom: 1px solid var(--color-border);
}
.app-header h1 { margin: 0 0 var(--space-md); font-size: 1.4rem; font-weight: 600; }

.tabs { display: flex; gap: var(--space-sm); }
.tab-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-muted-foreground);
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  min-height: 44px;
  transition: all 150ms ease;
}
.tab-btn[aria-selected="true"] {
  background: var(--color-card);
  color: var(--color-foreground);
  border-color: var(--color-accent);
}
.tab-btn:focus-visible { outline: 2px solid var(--color-ring); outline-offset: 2px; }

main { padding: var(--space-md); max-width: 640px; margin: 0 auto; }

.screen[data-active="false"] { display: none; }

/* --- Import screen --- */
.dropzone {
  width: 100%;
  border: 2px dashed var(--color-border);
  border-radius: 12px;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  background: transparent;
  color: var(--color-foreground);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  transition: border-color 150ms ease;
}
.dropzone:hover, .dropzone:focus-visible { border-color: var(--color-accent); }
.dropzone:focus-visible { outline: 2px solid var(--color-ring); outline-offset: 2px; }
.dropzone__icon { color: var(--color-accent); }
.dropzone__title { font-weight: 600; font-size: 1rem; }
.dropzone__sub { color: var(--color-muted-foreground); font-size: 0.85rem; }

.status { color: var(--color-muted-foreground); font-size: 0.9rem; margin-top: var(--space-md); }

/* --- Processing screen --- */
.processing { padding: var(--space-2xl) 0; text-align: center; }
.processing__label { font-weight: 500; margin-bottom: var(--space-md); }
.progress-bar {
  height: 6px;
  border-radius: 3px;
  background: var(--color-muted);
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  background: var(--color-accent);
  transition: width 200ms ease;
}
.processing__pct { font-family: 'JetBrains Mono', monospace; color: var(--color-muted-foreground); margin-top: var(--space-sm); font-size: 0.85rem; }

/* --- Playback bar (sticky, with focus-obscuring fix) --- */
.playback-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
  height: var(--sticky-bar-height);
}
.btn-icon {
  min-width: 48px;
  min-height: 48px;
  border-radius: 50%;
  border: none;
  background: var(--color-accent);
  color: var(--color-on-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.btn-icon:focus-visible { outline: 2px solid var(--color-ring); outline-offset: 2px; }
.playback-bar__time { font-size: 0.85rem; color: var(--color-muted-foreground); }
.btn-secondary {
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-foreground);
  padding: var(--space-sm) var(--space-md);
  border-radius: 8px;
  font-family: inherit;
  cursor: pointer;
  min-height: 44px;
}
.btn-secondary:hover { border-color: var(--color-accent); }
.btn-secondary:focus-visible { outline: 2px solid var(--color-ring); outline-offset: 2px; }

.mixer-scroll { scroll-padding-top: var(--sticky-bar-height); }

/* --- Channel strip (signature element) --- */
#channel-strips { display: flex; flex-direction: column; gap: var(--space-md); margin-top: var(--space-md); }

.channel-strip {
  background: var(--color-card);
  border-radius: 10px;
  padding: var(--space-md);
  border: 1px solid var(--color-border);
  scroll-margin-top: var(--sticky-bar-height);
  transition: box-shadow 150ms ease;
}
.channel-strip[data-active="true"] {
  box-shadow: 0 0 0 1px var(--color-accent), 0 0 16px rgba(224, 138, 60, 0.25);
}

.channel-strip__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.channel-strip__label {
  display: inline-block;
  background: var(--color-foreground);
  color: var(--color-background);
  transform: rotate(-1.5deg);
  padding: 2px 10px;
  border-radius: 2px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
}

.channel-strip__readout {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  color: var(--color-muted-foreground);
  min-width: 3.5em;
  text-align: right;
}

.channel-strip__wave {
  height: 32px;
  border-radius: 4px;
  background: var(--color-muted);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 0 var(--space-sm);
  overflow: hidden;
}
.channel-strip__wave span {
  flex: 1;
  background: var(--color-muted-foreground);
  border-radius: 1px;
  opacity: 0.35;
  transition: opacity 150ms ease, background 150ms ease;
}
.channel-strip[data-active="true"] .channel-strip__wave span {
  background: var(--color-foreground);
  opacity: 0.9;
}

.channel-strip__controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.btn-mute, .btn-solo, .btn-download {
  min-width: 48px;
  min-height: 48px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-muted-foreground);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease;
}
.btn-download { display: flex; align-items: center; justify-content: center; }
.btn-download:hover { color: var(--color-foreground); border-color: var(--color-accent); }
.btn-mute[aria-pressed="true"] {
  background: var(--color-destructive);
  color: var(--color-on-destructive);
  border-color: var(--color-destructive);
}
.btn-solo[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-on-accent);
  border-color: var(--color-accent);
}
.btn-mute:focus-visible, .btn-solo:focus-visible { outline: 2px solid var(--color-ring); outline-offset: 2px; }

.fader {
  flex: 1;
  min-height: 48px;
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  cursor: pointer;
}
.fader::-webkit-slider-runnable-track { height: 4px; background: var(--color-muted); border-radius: 2px; }
.fader::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  margin-top: -8px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-on-accent);
}
.fader::-moz-range-track { height: 4px; background: var(--color-muted); border-radius: 2px; }
.fader::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-on-accent);
}
.fader:focus-visible { outline: 2px solid var(--color-ring); outline-offset: 2px; }

/* --- Playlist --- */
.playlist-note { color: var(--color-muted-foreground); font-size: 0.85rem; margin-bottom: var(--space-md); }
.playlist-items { display: flex; flex-direction: column; gap: var(--space-sm); }
.playlist-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-md);
  cursor: pointer;
  min-height: 48px;
}
.playlist-item:hover { border-color: var(--color-accent); }
.playlist-item__name { font-weight: 500; }
.playlist-item__meta { font-size: 0.75rem; color: var(--color-muted-foreground); font-family: 'JetBrains Mono', monospace; }
.playlist-item__delete {
  background: transparent;
  border: none;
  color: var(--color-muted-foreground);
  min-width: 44px;
  min-height: 44px;
  cursor: pointer;
}
.playlist-item__delete:hover { color: var(--color-destructive); }
.playlist-empty { color: var(--color-muted-foreground); font-size: 0.9rem; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}