/* ════════════════════════════════════════════════════════════════
   Frado Player v3 — Stylesheet
   ════════════════════════════════════════════════════════════════
   All visual values driven by --fp-* design tokens.
   See docs/design-tokens.css for full specification and rationale.
   ════════════════════════════════════════════════════════════════ */


/* ── 1. Design Tokens (:root block) ───────────────────────────── */

:root {

  /* ─ Color: Background scale ──────────────────────────────────── */
  --fp-bg:            #0F0F23;
  --fp-surface:       #1B1B30;
  --fp-surface-2:     #252A40;
  --fp-surface-3:     #2E3550;

  /* ─ Color: Accent — Frado Brand Amber ────────────────────────── */
  --fp-accent:        #CA8A04;
  --fp-accent-bright: #EAB308;
  --fp-accent-muted:  #92400E;
  --fp-accent-glow:   rgba(202, 138, 4, 0.15);
  --fp-accent-border: rgba(202, 138, 4, 0.35);

  /* ─ Color: Text ──────────────────────────────────────────────── */
  --fp-text:          #F8FAFC;
  --fp-text-muted:    #94A3B8;
  --fp-text-disabled: rgba(248, 250, 252, 0.38);

  /* ─ Color: Semantic ──────────────────────────────────────────── */
  --fp-error:         #EF4444;
  --fp-success:       #22C55E;
  --fp-warning:       #F59E0B;

  /* ─ Color: Borders ───────────────────────────────────────────── */
  --fp-border:        rgba(255, 255, 255, 0.08);
  --fp-border-focus:  rgba(202, 138, 4, 0.80);

  /* ─ Typography ───────────────────────────────────────────────── */
  --fp-font-heading:  'Syne', system-ui, sans-serif;
  --fp-font-body:     'Manrope', system-ui, sans-serif;
  --fp-font-mono:     ui-monospace, 'SF Mono', 'Cascadia Code', monospace;

  --fp-text-xs:       0.6875rem;   /* 11px */
  --fp-text-sm:       0.75rem;     /* 12px */
  --fp-text-base:     0.875rem;    /* 14px */
  --fp-text-lg:       1rem;        /* 16px */

  --fp-lh-xs:         1.4;
  --fp-lh-sm:         1.5;
  --fp-lh-base:       1.5;
  --fp-lh-lg:         1.3;

  --fp-fw-normal:     400;
  --fp-fw-medium:     500;
  --fp-fw-semibold:   600;
  --fp-fw-bold:       700;

  --fp-ls-normal:     0em;
  --fp-ls-wide:       0.03em;
  --fp-ls-tight:      -0.01em;

  /* ─ Spacing (4pt grid) ───────────────────────────────────────── */
  --fp-space-1:       4px;
  --fp-space-2:       8px;
  --fp-space-3:       12px;
  --fp-space-4:       16px;
  --fp-space-5:       20px;
  --fp-space-6:       24px;
  --fp-space-8:       32px;

  --fp-space-card-pad:     var(--fp-space-4);
  --fp-space-row-pad-y:    10px;
  --fp-space-row-pad-x:    var(--fp-space-2);
  --fp-space-controls-gap: var(--fp-space-2);

  /* ─ Border Radius ────────────────────────────────────────────── */
  --fp-radius-sm:     6px;
  --fp-radius:        12px;
  --fp-radius-lg:     20px;
  --fp-radius-pill:   50px;
  --fp-radius-full:   9999px;

  /* ─ Component Sizes ──────────────────────────────────────────── */
  --fp-btn-touch:     44px;
  --fp-btn-play:      44px;
  --fp-btn-icon:      32px;

  --fp-seekbar-h:       3px;
  --fp-seekbar-h-hover: 5px;

  --fp-volume-h:        3px;
  --fp-volume-h-hover:  6px;
  --fp-volume-w:        80px;

  --fp-spectrum-h:      32px;
  --fp-playlist-max:    220px;

  /* ─ Motion ───────────────────────────────────────────────────── */
  --fp-ease-out:      cubic-bezier(0.16, 1, 0.3, 1);
  --fp-ease-in:       cubic-bezier(0.4, 0, 1, 1);
  --fp-ease-std:      ease-out;

  --fp-duration-fast:   150ms;
  --fp-duration-mid:    250ms;
  --fp-duration-enter:  300ms;
  --fp-duration-exit:   200ms;

  /* ─ Z-Index Scale ────────────────────────────────────────────── */
  --fp-z-base:        0;
  --fp-z-overlay:     10;
  --fp-z-modal:       100;
  --fp-z-tooltip:     200;
}


/* ── 2. Keyframes ──────────────────────────────────────────────── */

@keyframes fpBar {
  0%, 100% { height: var(--fp-space-1); }
  50%      { height: var(--fp-text-base); }
}

@keyframes fpPulse {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 1; }
}


/* ── 3. Card root ──────────────────────────────────────────────── */

.frado-player {
  display: block;
  background: var(--fp-bg);
  border-radius: var(--fp-radius);
  padding: var(--fp-space-card-pad);
  font-family: var(--fp-font-body);
  color: var(--fp-text);
  overflow: hidden;
}


/* ── 4. Header ─────────────────────────────────────────────────── */

.frado-player__header {
  display: flex;
  align-items: center;
  gap: var(--fp-space-2);
  margin-bottom: var(--fp-space-3);
}


/* ── 5. Spectrum icon animado ──────────────────────────────────── */

.frado-player__spectrum-icon {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: var(--fp-space-4);
  flex-shrink: 0;
}

.frado-player__spectrum-icon span {
  width: 3px;
  height: var(--fp-space-1);
  background: var(--fp-accent);
  border-radius: 2px;
  display: block;
}

.frado-player--playing .frado-player__spectrum-icon span:nth-child(1) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite;
}

.frado-player--playing .frado-player__spectrum-icon span:nth-child(2) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite 0.15s;
}

.frado-player--playing .frado-player__spectrum-icon span:nth-child(3) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite 0.3s;
}

.frado-player--playing .frado-player__spectrum-icon span:nth-child(4) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite 0.45s;
}


/* ── 6. Track title ────────────────────────────────────────────── */

.frado-player__track-title {
  flex: 1;
  font-family: var(--fp-font-heading);
  font-size: var(--fp-text-base);
  font-weight: var(--fp-fw-semibold);
  line-height: var(--fp-lh-base);
  letter-spacing: var(--fp-ls-tight);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}


/* ── 7. Time display ───────────────────────────────────────────── */

.frado-player__time {
  display: flex;
  align-items: center;
  gap: var(--fp-space-1);
  font-family: var(--fp-font-body);
  font-size: var(--fp-text-sm);
  line-height: var(--fp-lh-sm);
  color: var(--fp-text-muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.frado-player__time-elapsed,
.frado-player__time-duration {
  font-size: var(--fp-text-sm);
  color: var(--fp-text-muted);
  font-variant-numeric: tabular-nums;
}


/* ── 8. Seekbar ────────────────────────────────────────────────── */

.frado-player__progress {
  position: relative;
  width: 100%;
  height: var(--fp-space-4);
  cursor: pointer;
  margin-bottom: var(--fp-space-2);
  display: flex;
  align-items: center;
  touch-action: manipulation;
}

.frado-player__progress::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: var(--fp-seekbar-h);
  background: var(--fp-surface);
  border-radius: var(--fp-radius-pill);
  overflow: hidden;
  transition: height var(--fp-duration-fast) var(--fp-ease-std);
}

.frado-player__progress:hover::before {
  height: var(--fp-seekbar-h-hover);
}

.frado-player__progress-fill {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  height: var(--fp-seekbar-h);
  background: var(--fp-accent);
  border-radius: var(--fp-radius-pill);
  pointer-events: none;
  transition: height var(--fp-duration-fast) var(--fp-ease-std);
  z-index: var(--fp-z-base);
}

.frado-player__progress:hover .frado-player__progress-fill {
  height: var(--fp-seekbar-h-hover);
}


/* ── 9. Controls row ───────────────────────────────────────────── */

.frado-player__controls {
  display: flex;
  align-items: center;
  gap: var(--fp-space-controls-gap);
  margin-bottom: var(--fp-space-3);
}


/* ── 10. Transport ─────────────────────────────────────────────── */

.frado-player__transport {
  display: flex;
  align-items: center;
  gap: var(--fp-space-1);
  flex-shrink: 0;
}


/* ── 11. Buttons (base) ────────────────────────────────────────── */

.frado-player__btn {
  min-width: var(--fp-btn-touch);
  min-height: var(--fp-btn-touch);
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--fp-text-muted);
  border-radius: var(--fp-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color      var(--fp-duration-fast) var(--fp-ease-std),
              background var(--fp-duration-fast) var(--fp-ease-std);
  padding: 0;
  line-height: 1;
}

.frado-player__btn:hover {
  color: var(--fp-text);
  background: var(--fp-surface-2);
}

.frado-player__btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  flex-shrink: 0;
}

/* Disabled button state */
.frado-player__btn[aria-disabled="true"] {
  color: var(--fp-text-disabled);
  cursor: default;
  pointer-events: none;
}


/* ── 12. Play button ───────────────────────────────────────────── */

.frado-player__btn--play {
  background: var(--fp-accent);
  color: #000;
  border-radius: var(--fp-radius-full);
  width: var(--fp-btn-play);
  height: var(--fp-btn-play);
  transition: background var(--fp-duration-fast) var(--fp-ease-std),
              color      var(--fp-duration-fast) var(--fp-ease-std),
              transform  var(--fp-duration-mid)  var(--fp-ease-out);
}

.frado-player__btn--play:hover {
  background: var(--fp-accent-bright);
  color: #000;
  transform: scale(1.08);
  box-shadow: 0 0 0 6px var(--fp-accent-glow);
}


/* ── 13. Play/Pause icon swap ──────────────────────────────────── */

.frado-player__icon-pause { display: none; }
.frado-player__icon-play  { display: block; }

.frado-player--playing .frado-player__icon-play  { display: none; }
.frado-player--playing .frado-player__icon-pause { display: block; }


/* ── 14. Volume icon states ────────────────────────────────────── */

.frado-player__icon-vol-high   { display: block; }
.frado-player__icon-vol-mid    { display: none; }
.frado-player__icon-vol-low    { display: none; }
.frado-player__icon-vol-muted  { display: none; }

.frado-player--muted .frado-player__icon-vol-high   { display: none; }
.frado-player--muted .frado-player__icon-vol-muted  { display: block; }


/* ── 15. Spectrum canvas ───────────────────────────────────────── */

.frado-player__spectrum {
  flex: 1;
  height: var(--fp-spectrum-h);
  display: block;
  cursor: default;
  border-radius: var(--fp-space-1);
}


/* ── 16. Volume group ──────────────────────────────────────────── */

.frado-player__volume-group {
  display: flex;
  align-items: center;
  gap: var(--fp-space-1);
  flex-shrink: 0;
}

.frado-player__volume-track {
  width: var(--fp-volume-w);
  height: var(--fp-volume-h);
  position: relative;
  cursor: pointer;
  border-radius: var(--fp-radius-pill);
  background: rgba(255,255,255,0.12);
  overflow: visible;
  transition: height var(--fp-duration-fast) var(--fp-ease-std);
  touch-action: manipulation;
}

.frado-player__volume-track:hover,
.frado-player__volume-track--dragging {
  height: var(--fp-volume-h-hover);
}

.frado-player__volume-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: var(--fp-accent, #CA8A04) !important;
  border-radius: inherit;
  pointer-events: none;
}

.frado-player__volume-thumb {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: var(--fp-space-3);
  height: var(--fp-space-3);
  border-radius: var(--fp-radius-full);
  background: var(--fp-accent, #CA8A04) !important;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--fp-duration-fast) var(--fp-ease-std);
}

.frado-player__volume-track:hover .frado-player__volume-thumb,
.frado-player__volume-track--dragging .frado-player__volume-thumb {
  opacity: 1;
}


/* ── 17. Playlist ──────────────────────────────────────────────── */

.frado-player__playlist {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--fp-border);
  padding-top: var(--fp-space-2);
  max-height: var(--fp-playlist-max);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--fp-border) transparent;
}

.frado-player__track {
  display: flex;
  align-items: center;
  gap: var(--fp-space-3);
  padding: var(--fp-space-row-pad-y) var(--fp-space-row-pad-x);
  border-radius: var(--fp-radius-sm);
  cursor: pointer;
  transition: background var(--fp-duration-fast) var(--fp-ease-std);
  font-size: var(--fp-text-base);
}

.frado-player__track:hover {
  background: var(--fp-surface-2);
}

.frado-player__track--active,
.frado-player__track[aria-current="true"] {
  background: var(--fp-surface);
  color: var(--fp-accent);
  border-left: 3px solid var(--fp-accent);
}

.frado-player__track-num {
  min-width: 20px;
  text-align: right;
  color: var(--fp-text-muted);
  font-size: var(--fp-text-sm);
}

.frado-player__track-name {
  flex: 1;
  font-family: var(--fp-font-heading);
  font-weight: var(--fp-fw-semibold);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.frado-player__track-duration {
  color: var(--fp-text-muted);
  font-size: var(--fp-text-sm);
  font-variant-numeric: tabular-nums;
}


/* ── 18. Video mode ────────────────────────────────────────────── */

.frado-player--video .frado-player__video-wrap {
  position: relative;
  border-radius: var(--fp-radius) var(--fp-radius) 0 0;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #000;
}

.frado-player__video-wrap video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.frado-player__embed-iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: none;
  position: absolute;
  inset: 0;
}

.frado-player--embed .frado-player__video-overlay {
  display: none;
}

.frado-player__video-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background: linear-gradient(transparent 40%, rgba(0, 0, 0, 0.7));
  opacity: 0;
  transition: opacity var(--fp-duration-mid) var(--fp-ease-std);
  padding: var(--fp-space-3);
}

.frado-player--video:hover .frado-player__video-overlay,
.frado-player--video.frado-player--paused .frado-player__video-overlay {
  opacity: 1;
}


/* ── 19. Mobile Bottom Sheet ───────────────────────────────────── */

.frado-player__sheet-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: var(--fp-z-modal);
  display: none;
}

.frado-player__sheet-backdrop--open {
  display: block;
}

.frado-player__sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: calc(var(--fp-z-modal) + 1);
  background: var(--fp-bg);
  border-radius: var(--fp-radius-lg) var(--fp-radius-lg) 0 0;
  max-height: 85dvh;
  overflow-y: auto;
  padding: var(--fp-space-3) var(--fp-space-4);
  padding-bottom: max(var(--fp-space-4), env(safe-area-inset-bottom));
  transform: translateY(100%);
  transition: transform var(--fp-duration-enter) var(--fp-ease-out);
  display: none;
}

.frado-player__sheet--open {
  transform: translateY(0);
  display: block;
}

.frado-player__sheet--closing {
  transition: transform var(--fp-duration-exit) var(--fp-ease-in);
}

.frado-player__sheet-handle {
  width: 36px;
  height: var(--fp-space-1);
  background: var(--fp-border);
  border-radius: var(--fp-radius-pill);
  margin: 0 auto var(--fp-space-4);
  display: block;
}


/* ── 20. State-based styles (data-fp-state) ────────────────────── */

/* Loading: pulse the spectrum bars */
.frado-player[data-fp-state="loading"] .frado-player__spectrum-icon span {
  animation: fpPulse 1.2s var(--fp-ease-std) infinite;
}

/* Error: tint the player border to signal failure */
.frado-player[data-fp-state="error"] {
  box-shadow: inset 0 0 0 2px var(--fp-error);
}

.frado-player[data-fp-state="error"] .frado-player__track-title {
  color: var(--fp-error);
}

/* Playing: spectrum icon bars animate (handled via --playing class above,
   but also provide data-attribute hook for future JS using _FPState) */
.frado-player[data-fp-state="playing"] .frado-player__spectrum-icon span:nth-child(1) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite;
}

.frado-player[data-fp-state="playing"] .frado-player__spectrum-icon span:nth-child(2) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite 0.15s;
}

.frado-player[data-fp-state="playing"] .frado-player__spectrum-icon span:nth-child(3) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite 0.3s;
}

.frado-player[data-fp-state="playing"] .frado-player__spectrum-icon span:nth-child(4) {
  animation: fpBar 0.8s var(--fp-ease-std) infinite 0.45s;
}


/* ── 21. Focus styles (keyboard navigation) ────────────────────── */

.frado-player:focus-visible,
.frado-player__progress:focus-visible,
.frado-player__volume-track:focus-visible,
.frado-player__track:focus-visible {
  outline: 2px solid var(--fp-border-focus);
  outline-offset: 2px;
}

.frado-player__btn:focus-visible {
  outline: 2px solid var(--fp-border-focus);
  outline-offset: 2px;
}


/* ── 22. Aria-live region (visually hidden) ────────────────────── */

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


/* ── 23. Responsive mobile ─────────────────────────────────────── */

@media (max-width: 767px) {
  .frado-player__volume-track {
    width: 60px;
  }

  .frado-player__spectrum {
    min-width: 60px;
  }
}


/* ── 24. Reduced motion ────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  /* Disable spectrum bar animation entirely */
  .frado-player__spectrum-icon span {
    animation: none !important;
  }

  /* Disable loading pulse animation */
  .frado-player[data-fp-state="loading"] .frado-player__spectrum-icon span {
    animation: none !important;
  }

  /* Disable playing state animations via data-attribute */
  .frado-player[data-fp-state="playing"] .frado-player__spectrum-icon span {
    animation: none !important;
  }

  /* Kill all transition durations across the entire player */
  .frado-player,
  .frado-player *,
  .frado-player *::before,
  .frado-player *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  /* Seekbar: no transition on progress fill height */
  .frado-player__progress-fill {
    transition: none !important;
  }

  /* Progress track: no height transition */
  .frado-player__progress::before {
    transition: none !important;
  }

  /* Volume: no height transition */
  .frado-player__volume-track {
    transition: none !important;
  }

  /* Volume thumb: no opacity transition */
  .frado-player__volume-thumb {
    transition: none !important;
  }

  /* Play button: no scale/background transition */
  .frado-player__btn--play {
    transition: none !important;
  }

  /* Video overlay: no opacity transition */
  .frado-player__video-overlay {
    transition: none !important;
  }

  /* Bottom sheet: no transform transition */
  .frado-player__sheet {
    transition: none !important;
  }

  /* Playlist rows: no background transition */
  .frado-player__track {
    transition: none !important;
  }

  /* Buttons: no color/background transition */
  .frado-player__btn {
    transition: none !important;
  }
}


/* ── 25. Light mode ────────────────────────────────────────────── */
/* Player is always dark — light mode override removed intentionally */