/* ----------------------------------------------------------------
       Design tokens
       #e0e0e0 on #1a1a2e → contrast ≈ 12.9:1  (WCAG AAA)
       #ffffff on #2d5a87 → contrast ≈ 7.2:1   (WCAG AA)
       #7eb3e8 thumb on #16213e → contrast ≈ 7.2:1 (non-text ≥ 3:1 ✓)
       Focus ring: 2px solid #7eb3e8 — visible on all bg colors
    ---------------------------------------------------------------- */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

    :root {
      --bg:        #1a1a2e;
      --bg-card:   #16213e;
      --border:    #0f3460;
      --accent:    #7eb3e8;
      --text:      #e0e0e0;
      --text-dim:  #a0a0b0;
      --btn-bg:    #2d5a87;
      --btn-hover: #3a72a8;
      --btn-text:  #ffffff;
      --danger:    #c0392b;
      --green:     #27ae60;
      --radius:    6px;
      --badge-border: #4d7eb5;   /* 3.76:1 on --bg-card; meets 1.4.11 3:1 minimum */
    }

    body {
      background: var(--bg);
      color: var(--text);
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
      font-size: 1rem;
      line-height: 1.5;
      min-height: 100vh;
    }

    /* Skip-to-content link (WCAG 2.4.1) */
    .skip-link {
      position: absolute;
      top: -999px;
      left: 0;
      background: var(--accent);
      color: #000;
      padding: 0.5rem 1rem;
      z-index: 9999;
      font-weight: 600;
      border-radius: 0 0 var(--radius) 0;
    }
    .skip-link:focus { top: 0; }

    /* Focus ring — never removed */
    :focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 3px;
    }

    header {
      background: var(--bg-card);
      border-bottom: 1px solid var(--border);
      padding: 1rem 1.5rem;
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    header h1 {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: 0.05em;
    }
    #conn-status {
      font-size: 0.8rem;
      padding: 0.2rem 0.6rem;
      border-radius: 999px;
      background: var(--border);
      color: var(--text-dim);
    }
    #conn-status.connected   { background: var(--green);  color: #fff; }
    /* Fix 1: #e67e22 on white only reaches 2.85:1 — use dark text instead */
    #conn-status.connecting  { background: #e67e22; color: #000; }
    #conn-status.error       { background: var(--danger);  color: #fff; }

    main {
      max-width: 780px;
      margin: 0 auto;
      padding: 1.5rem 1rem 3rem;
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 1.25rem 1.5rem;
    }
    .card h2 {
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--text-dim);
      margin-bottom: 0.75rem;
    }

    /* ---- Now playing ---- */
    #now-playing-announce {
      font-size: 1.2rem;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 0.4rem;
    }
    #now-playing-meta {
      font-size: 0.875rem;
      color: var(--text-dim);
    }
    #progress-bar-wrap {
      margin-top: 0.75rem;
    }
    #progress-bar-label {
      font-size: 0.8rem;
      color: var(--text-dim);
      margin-bottom: 0.3rem;
    }
    #progress-track {
      width: 100%;
      height: 24px;           /* 2.5.8: min 24 px interactive target */
      background: transparent;
      border-radius: 3px;
      overflow: visible;
      position: relative;
      cursor: pointer;
    }
    /* Visual 6 px bar centred inside the 24 px hit zone */
    #progress-track::before {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      top: 50%;
      height: 6px;
      transform: translateY(-50%);
      background: var(--border);
      border-radius: 3px;
      pointer-events: none;
    }
    #progress-fill {
      position: absolute;
      left: 0;
      top: 50%;
      transform: translateY(-50%);
      height: 6px;
      background: var(--accent);
      border-radius: 3px;
      width: 0%;
      transition: width 0.5s linear;
      pointer-events: none;
    }
    #cue-strip {
      position: absolute;
      inset: 0;
      pointer-events: none;
    }
    #cue-strip .cue-mark {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 2px;
      height: 10px;
      border-radius: 1px;
      box-shadow: 0 0 0 1px rgba(0,0,0,0.45);
    }

    /* ---- Controls ---- */
    .controls-row {
      display: flex;
      flex-wrap: wrap;
      gap: 0.75rem;
      align-items: center;
    }

    button {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      padding: 0.55rem 1.1rem;
      background: var(--btn-bg);
      color: var(--btn-text);
      border: none;
      border-radius: var(--radius);
      font-size: 0.95rem;
      font-weight: 500;
      cursor: pointer;
      min-width: 44px;   /* WCAG 2.5.5 touch target */
      min-height: 44px;
      transition: background 0.15s;
    }
    button:hover  { background: var(--btn-hover); }
    button:active { background: var(--accent); color: #000; }
    /* Fix 1: #e67e22 on white only reaches 2.85:1 — use dark text */
    button[aria-pressed="true"] {
      background: #e67e22;
      color: #000;
    }
    button:disabled {
      opacity: 0.45;
      cursor: not-allowed;
    }

    /* ---- Volume ---- */
    .volume-row {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      flex-wrap: wrap;
    }
    #vol-label-text { font-size: 0.875rem; min-width: 3.5rem; }

    input[type="range"] {
      -webkit-appearance: none;
      appearance: none;
      flex: 1;
      min-width: 120px;
      height: 6px;
      background: var(--border);
      border-radius: 3px;
      cursor: pointer;
      accent-color: var(--accent);
    }
    input[type="range"]::-webkit-slider-thumb {
      -webkit-appearance: none;
      width: 24px;            /* 2.5.8: min 24 px touch target */
      height: 24px;
      border-radius: 50%;
      background: var(--accent);
      border: 2px solid var(--bg);
    }
    input[type="range"]::-moz-range-thumb {
      width: 24px;            /* 2.5.8: min 24 px touch target */
      height: 24px;
      border-radius: 50%;
      background: var(--accent);
      border: 2px solid var(--bg);
    }
    #vol-pct { font-size: 0.875rem; min-width: 3rem; text-align: right; }

    /* ---- Up next ---- */
    #next-track-text {
      font-size: 1rem;
      color: var(--text-dim);
    }

    /* ---- Search ---- */
    .search-row {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }
    #search-input {
      flex: 1;
      min-width: 180px;
      padding: 0.55rem 0.85rem;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      color: var(--text);
      font-size: 0.95rem;
    }
    #search-input::placeholder { color: var(--text-dim); }
    #search-input:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    #search-results {
      margin-top: 0.75rem;
      list-style: none;
    }
    #search-results li {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.45rem 0.25rem;
      border-bottom: 1px solid var(--border);
      font-size: 0.9rem;
    }
    #search-results li:last-child { border-bottom: none; }
    #search-results .no-results { color: var(--text-dim); font-style: italic; }
    .result-name {
      flex: 1;
      min-width: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .result-btn {
      flex-shrink: 0;
      padding: 0.25rem 0.6rem;
      font-size: 0.8rem;
      min-height: 36px;
      min-width: 36px;
    }

    /* ---- History ---- */
    #history-list {
      list-style: none;
    }
    #history-list li {
      padding: 0.4rem 0.25rem;
      border-bottom: 1px solid var(--border);
      font-size: 0.875rem;
      color: var(--text-dim);
    }
    #history-list li:last-child { border-bottom: none; }
    #history-list .history-title { color: var(--text); font-weight: 500; }

    /* ---- Now playing row (cover art + text) ---- */
    .now-playing-row {
      display: flex;
      gap: 1rem;
      align-items: flex-start;
    }
    #cover-art {
      width: 96px;
      height: 96px;
      flex-shrink: 0;
      object-fit: cover;
      border-radius: 6px;
      background: var(--surface-2, #222);
    }
    .now-playing-text {
      flex: 1;
      min-width: 0;
    }

    /* ---- Lyrics ---- */
    #lyrics-list {
      list-style: none;
      max-height: 14rem;
      overflow-y: auto;
      padding: 0.5rem 0;
      font-size: 0.95rem;
      line-height: 1.5;
    }
    #lyrics-list li {
      padding: 0.2rem 0.5rem;
      color: var(--text-dim);
      border-radius: 4px;
    }
    #lyrics-list li.active {
      color: var(--text);
      background: rgba(255,255,255,0.05);
      font-weight: 600;
      /* High-contrast outline ensures visibility for low-vision users */
      outline: 2px solid var(--accent);
      outline-offset: -2px;
    }

    /* ---- Queue ---- */
    #queue-list {
      list-style: none;
      padding: 0;
    }
    #queue-list li {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.45rem 0.25rem;
      border-bottom: 1px solid var(--border);
      font-size: 0.9rem;
    }
    #queue-list li:last-child { border-bottom: none; }
    .queue-name {
      flex: 1;
      min-width: 0;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
    .queue-btn {
      flex-shrink: 0;
      padding: 0.25rem 0.6rem;
      font-size: 0.8rem;
      min-height: 36px;
      min-width: 36px;
    }
    .queue-btn:disabled {
      opacity: 0.4;
      cursor: not-allowed;
    }

    /* ---- Now-playing badges (BPM / key / energy / beatmatch) ---- */
    .badges-row {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      margin-top: 0.5rem;
      font-size: 0.85rem;
    }
    .badge {
      padding: 0.15rem 0.5rem;
      background: rgba(255,255,255,0.07);
      border: 1px solid var(--badge-border);   /* 1.4.11: 3.76:1 on --bg-card */
      border-radius: 4px;
      color: var(--text-dim);
    }
    .badge.badge-key   { color: var(--accent); }
    .badge.badge-stretch { color: #ffb86c; }

    /* ---- 3-band EQ ---- */
    .eq-row {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin: 0.5rem 0;
    }
    .eq-row label {
      width: 4rem;
      font-weight: 600;
    }
    .eq-row input[type="range"] {
      flex: 1;
    }
    .eq-value {
      min-width: 4rem;
      text-align: right;
      font-variant-numeric: tabular-nums;
      color: var(--text-dim);
      font-size: 0.85rem;
    }
    #btn-eq-reset {
      margin-top: 0.5rem;
    }

    /* ---- Settings card ---- */
    fieldset {
      border: 1px solid var(--border);
      border-radius: 6px;
      margin: 0 0 0.75rem 0;
      padding: 0.5rem 0.75rem 0.75rem;
    }
    fieldset legend {
      padding: 0 0.4rem;
      font-weight: 600;
    }
    /* `hidden` attribute must win over author display rules
       (settings-row uses flex, setting-desc uses block; both beat the
       UA [hidden] {display:none} on specificity).  Enforce spec
       behaviour so data-show-when actually hides its targets. */
    [hidden] {
      display: none !important;
    }
    .settings-row {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin: 0.4rem 0;
    }
    .settings-row label {
      min-width: 10rem;
    }
    .settings-row input[type="number"] {
      width: 6rem;
    }
    .settings-row select {
      flex: 1;
      min-width: 8rem;
    }
    .settings-check {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin: 0.3rem 0;
    }
    .settings-check input[type="checkbox"] {
      width: 1.1rem;
      height: 1.1rem;
    }
    /* Inline help text — sighted readers see grey description below
       each control; screen readers receive it via aria-describedby. */
    .setting-desc {
      display: block;
      margin: 0.15rem 0 0.55rem 1.7rem;
      font-size: 0.83rem;
      color: #b8c5d8;             /* ≥ 4.5:1 vs --bg */
      line-height: 1.35;
    }
    .settings-row + .setting-desc {
      margin-left: 10rem;
    }

    /* ---- Collapsible cards (<details>/<summary>) ---- */
    details.card { padding: 0; }
    details.card > summary {
      list-style: none;
      cursor: pointer;
      padding: 1rem 1.25rem;
      user-select: none;
      position: relative;
      /* Heading appearance — replaces the removed <h2> inside <summary>.
         Prevents double-announcement (button + heading) in NVDA/VoiceOver. */
      font-size: 1.1rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--text-dim);
    }
    details.card > summary::-webkit-details-marker { display: none; }
    details.card > summary::after {
      content: "\25B8" / "";   /* ▸ collapsed — alt "" hides from AT (CSS gen-content spec) */
      position: absolute;
      right: 1.25rem;
      top: 50%;
      transform: translateY(-50%);
      transition: transform 0.15s ease;
      color: var(--text-dim);
    }
    details.card[open] > summary::after {
      content: "\25BE" / "";   /* ▾ expanded */
    }
    /* High-contrast focus ring on the summary (3:1+ guaranteed) */
    details.card > summary:focus-visible {
      outline: 3px solid var(--accent);
      outline-offset: -3px;
    }
    details.card > *:not(summary) {
      padding: 0 1.25rem 1rem;
    }

    /* ---- Visually hidden utility (WCAG-compliant clip pattern) ---- */
    .visually-hidden {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0, 0, 0, 0);
      white-space: nowrap;
      border: 0;
    }

    /* ----------------------------------------------------------------
       Mobile / narrow-screen layout (≤ 720 px) — phone & narrow tablet.
       WCAG 2.5.5 Target Size: interactive elements ≥ 44 × 44 CSS px.
    ---------------------------------------------------------------- */
    @media (max-width: 720px) {
      body { font-size: 0.95rem; }
      header { padding: 0.5rem 0.75rem; }
      main { padding: 0 0.75rem; }
      .card { padding: 0.75rem; margin-bottom: 0.75rem; }

      /* Stack horizontal control rows on narrow screens */
      .controls-row {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
      }

      /* Bigger touch targets for every button + slider */
      button,
      .pill-btn,
      input[type="range"]::-webkit-slider-thumb,
      input[type="range"]::-moz-range-thumb {
        min-height: 44px;
      }
      button, .pill-btn {
        min-width: 44px;
        padding: 0.6rem 0.9rem;
      }

      /* Settings card — collapse by default on mobile via [open] state */
      details.settings-card > summary {
        padding: 0.75rem;
        font-size: 1rem;
      }

      /* Form fields full-width on phone */
      .settings-row {
        flex-direction: column;
        align-items: stretch;
      }
      .settings-row > * {
        width: 100%;
      }
      .settings-row select,
      .settings-row input[type="number"],
      .settings-row input[type="text"] {
        min-height: 44px;
        font-size: 1rem;
      }

      /* Now-playing card — cover shrinks but stays prominent */
      #cover-art {
        width: 96px;
        height: 96px;
      }

      /* Queue items — taller rows for finger taps */
      .queue-item {
        padding: 0.5rem 0.5rem;
      }
      .queue-item button {
        padding: 0.4rem 0.6rem;
      }

      /* Hide the keyboard-hint footer on phone — irrelevant */
      .keyboard-hint { display: none; }
    }

    /* Phone-tight rules (≤ 480 px) — extra-small */
    @media (max-width: 480px) {
      .controls-row { justify-content: center; }
      header { padding: 0.5rem 0.75rem; }
      #cover-art { width: 80px; height: 80px; }
      h1 { font-size: 1.1rem; }
      .now-playing-title { font-size: 1rem; }
    }

    /* ----------------------------------------------------------------
       Section switcher — ARIA tablist (replaces the old anchor nav)
       ---------------------------------------------------------------- */
    #view-nav {
      background: var(--bg-card);
      border-bottom: 1px solid var(--border);
      padding: 0.25rem 1rem;
    }
    #view-nav [role="tablist"] {
      display: flex;
      flex-wrap: wrap;
      gap: 0.25rem;
    }
    #view-nav [role="tab"] {
      display: inline-block;
      padding: 0.5rem 0.9rem;
      color: var(--text);
      background: transparent;
      border: 1px solid transparent;
      border-radius: var(--radius);
      font: inherit;
      font-weight: 500;
      cursor: pointer;
    }
    #view-nav [role="tab"]:hover,
    #view-nav [role="tab"]:focus-visible {
      background: var(--btn-bg);
      color: var(--btn-text);
    }
    #view-nav [role="tab"][aria-selected="true"] {
      background: var(--accent);
      color: #000;
    }
    /* Section headings get tabindex -1 for focus management; suppress the
       focus ring on programmatic focus so it doesn't look like a stale
       artefact after switching views. */
    section[data-view] h2:focus-visible { outline: 2px solid var(--accent); }

    @media (max-width: 720px) {
      #view-nav { padding: 0.25rem 0.5rem; }
      #view-nav [role="tab"] { padding: 0.6rem 0.8rem; }
    }

    /* ----------------------------------------------------------------
       Camelot wheel — decorative visual aid for harmonic mixing.
       Hidden from AT (#badges-announce already conveys the key).
       ---------------------------------------------------------------- */
    #camelot-wheel {
      display: block;
      width: 200px;
      height: 200px;
      margin: 0.75rem auto 0;
      max-width: 100%;
    }
    #camelot-wheel .sector {
      fill: rgba(255, 255, 255, 0.04);
      stroke: rgba(255, 255, 255, 0.20);
      stroke-width: 0.6;
      transition: fill 0.18s ease;
    }
    #camelot-wheel .sector.compat {
      /* Mid-tone fill — distinguishes 'mixable' from idle (~3:1 contrast
         vs the card background) without competing with the active cell. */
      fill: rgba(126, 179, 232, 0.30);  /* var(--accent) at 30% */
    }
    #camelot-wheel .sector.active {
      fill: var(--accent);
      stroke: #fff;
      stroke-width: 1.6;       /* extra stroke = colour-independent cue */
    }
    #camelot-wheel .label {
      fill: var(--text);
      pointer-events: none;
    }
    #camelot-wheel .label.minor { fill: var(--text-dim); }
    #camelot-wheel .label.active { fill: #000; font-weight: 700; }

    @media (prefers-reduced-motion: reduce) {
      #camelot-wheel .sector { transition: none; }
    }

/* Hotkey help modal -------------------------------------------------- */

#hotkey-help-modal {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  max-width: 32rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}
#hotkey-help-modal::backdrop {
  background: rgba(0, 0, 0, 0.55);
}
#hotkey-help-modal kbd {
  /* Dark theme: light surface + dark text, ~10:1 contrast against the
     #16213e card background (WCAG AA passes for both kbd-text-on-kbd-bg
     and kbd-on-card surface). */
  background: #f4f6fb;
  color: #0f1626;
  border: 1px solid #c0c8d4;
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0.05em 0.4em;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.85em;
  white-space: nowrap;
}
#hotkey-help-modal dt { font-weight: 600; }
#hotkey-help-modal dd { margin: 0; }

/* Build-stamp footer.  Dim text on dark theme; --text-dim (#a0a0b0)
   on --bg (#1a1a2e) clears WCAG AA 4.5:1 (1.4.3).  Decorative
   middle-dots are aria-hidden in markup; styled here to keep visual
   spacing consistent regardless of font metrics. */
#page-footer {
  margin-top: 1.5rem;
  padding: 0.75rem 1rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-dim);
}
#page-footer p {
  margin: 0;
}
#page-footer .ver-sep {
  margin: 0 0.4em;
  opacity: 0.7;
}
#page-footer code,
#page-footer #ver-commit {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}