/* Katten: evening violet, wool-pink accent, amber needle, a ginger cat holding the gauge, mint for in tune */
:root[data-look="cats"] {
  --bg: #16121f;
  --surface: #221c31;
  --surface-2: #2c2540;
  --line: #4a4062;
  --accent: #ff7a9a;
  --accent-text: #ff8fab;
  --accent-deep: #c24a6c;
  --on-accent: #16121f;
  --focus: #ffc04d;
  --text: #f4eefb;
  --muted: #b6abcb;
  --bust: #b8334f;
  --on-bust: #ffffff;
  --danger-text: #ff9fb4;
  --glow: rgba(255, 192, 77, .13);
  --scrim: rgba(10, 7, 16, .62);
  --toast-bg: #f6ead2;
  --toast-ink: #352544;
  --switch-off: #4a4062;
  --switch-knob: #f4eefb;
  --good: #8fe3b0;
  --on-good: #10261a;
  --good-glow: rgba(143, 227, 176, .32);
  --needle: #ffc04d;
  --zone-off: rgba(244, 238, 251, .06);
  --track: #5a4f75;
  --tick: #b6abcb;
  --cat-fur: #f0a35e;
  --cat-line: #5a3524;
  --cat-ear: #f2a7a0;
  --cat-eye: #8fe3b0;
}
[data-look="cats"] body {
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='64' height='64' viewBox='0 0 64 64'%3E%3Cg fill='white' fill-opacity='.045'%3E%3Cg transform='translate(16 18) rotate(-18)'%3E%3Cellipse cx='0' cy='4.5' rx='5' ry='4'/%3E%3Ccircle cx='-5.6' cy='-2' r='2'/%3E%3Ccircle cx='-2' cy='-5.6' r='2'/%3E%3Ccircle cx='2' cy='-5.6' r='2'/%3E%3Ccircle cx='5.6' cy='-2' r='2'/%3E%3C/g%3E%3Cg transform='translate(48 50) rotate(16)'%3E%3Cellipse cx='0' cy='4.5' rx='5' ry='4'/%3E%3Ccircle cx='-5.6' cy='-2' r='2'/%3E%3Ccircle cx='-2' cy='-5.6' r='2'/%3E%3Ccircle cx='2' cy='-5.6' r='2'/%3E%3Ccircle cx='5.6' cy='-2' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"),
    var(--bg);
}
[data-look="cats"] body { isolation: isolate; }
[data-look="cats"] body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(130% 55% at 50% 105%, rgba(255, 192, 77, .18), transparent 62%),
    radial-gradient(90% 40% at 50% -5%, rgba(255, 122, 154, .14), transparent 60%);
  transform: scale(1.07);
  will-change: transform, filter;
  animation: cats-ambient 40s ease-in-out infinite alternate;
}
@keyframes cats-ambient {
  from { transform: translate3d(-3%, 1.5%, 0) scale(1.07); filter: hue-rotate(-8deg); }
  to { transform: translate3d(3%, -1.5%, 0) scale(1.1); filter: hue-rotate(8deg); }
}
@media (prefers-reduced-motion: reduce) {
  [data-look="cats"] body::before { animation: none; will-change: auto; }
}

/* Apple: iOS grouped surfaces, system colours, follows light and dark */
:root[data-look="apple"] {
  --bg: #f2f2f7;
  --surface: #ffffff;
  --surface-2: rgba(118, 118, 128, .12);
  --line: rgba(60, 60, 67, .29);
  --accent: #0066cc;
  --accent-text: #0066cc;
  --accent-deep: transparent;
  --on-accent: #ffffff;
  --focus: #0066cc;
  --text: #000000;
  --muted: #6c6c70;
  --bust: #d70015;
  --on-bust: #ffffff;
  --danger-text: #d70015;
  --glow: transparent;
  --scrim: rgba(0, 0, 0, .3);
  --shadow: rgba(0, 0, 0, .18);
  --toast-bg: #1c1c1e;
  --toast-ink: #ffffff;
  --switch-off: #e9e9eb;
  --switch-knob: #ffffff;
  --good: #1f7a35;
  --on-good: #ffffff;
  --good-glow: rgba(52, 199, 89, .28);
  --needle: #ff3b30;
  --zone-off: rgba(118, 118, 128, .1);
  --track: #c7c7cc;
  --tick: #8e8e93;
  --seg-on: #ffffff;
  --digits: var(--rounded);
  --display: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', system-ui, sans-serif;
  --body: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', system-ui, sans-serif;
  --rounded: ui-rounded, 'SF Pro Rounded', -apple-system, system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root[data-look="apple"]:not([data-appearance="light"]) {
    --bg: #000000;
    --surface: #1c1c1e;
    --surface-2: rgba(118, 118, 128, .24);
    --line: rgba(84, 84, 88, .65);
    --accent: #0a6fe0;
    --accent-text: #4da3ff;
    --focus: #4da3ff;
    --text: #ffffff;
    --muted: #aeaeb2;
    --bust: #d70015;
    --danger-text: #ff6961;
    --shadow: rgba(0, 0, 0, .6);
    --toast-bg: #f2f2f7;
    --toast-ink: #000000;
    --switch-off: #39393d;
    --switch-knob: #ffffff;
    --good: #30d158;
    --on-good: #002b0c;
    --good-glow: rgba(48, 209, 88, .3);
    --needle: #ff453a;
    --zone-off: rgba(118, 118, 128, .2);
    --track: #48484a;
    --tick: #8e8e93;
    --seg-on: #636366;
    color-scheme: dark;
  }
}
:root[data-look="apple"][data-appearance="dark"] {
  --bg: #000000;
  --surface: #1c1c1e;
  --surface-2: rgba(118, 118, 128, .24);
  --line: rgba(84, 84, 88, .65);
  --accent: #0a6fe0;
  --accent-text: #4da3ff;
  --focus: #4da3ff;
  --text: #ffffff;
  --muted: #aeaeb2;
  --bust: #d70015;
  --danger-text: #ff6961;
  --shadow: rgba(0, 0, 0, .6);
  --toast-bg: #f2f2f7;
  --toast-ink: #000000;
  --switch-off: #39393d;
  --switch-knob: #ffffff;
  --good: #30d158;
  --on-good: #002b0c;
  --good-glow: rgba(48, 209, 88, .3);
  --needle: #ff453a;
  --zone-off: rgba(118, 118, 128, .2);
  --track: #48484a;
  --tick: #8e8e93;
  --seg-on: #636366;
  color-scheme: dark;
}
[data-look="cats"] .tuner-card { border-radius: 32px; }
[data-look="cats"] .string-btn { border-radius: 18px; }
[data-look="apple"] body { font-size: 17px; -webkit-font-smoothing: antialiased; }
[data-look="apple"] .btn { border-radius: 999px; font-weight: 600; }
[data-look="apple"] .btn.primary { box-shadow: none; }
[data-look="apple"] .btn.big { font-family: var(--body); font-weight: 600; font-size: 19px; min-height: 58px; }
[data-look="apple"] .btn.ghost { border: 0; background: var(--surface); color: var(--accent-text); }
[data-look="apple"] .btn.stop-btn { color: var(--danger-text); }
[data-look="apple"] .icon-btn { border: 0; border-radius: 50%; color: var(--text); box-shadow: 0 1px 3px rgba(0, 0, 0, .12), 0 0 0 .5px rgba(0, 0, 0, .06); }
[data-look="apple"] .segmented { background: var(--surface-2); border-radius: 999px; }
[data-look="apple"] .segmented.wrap { border-radius: 22px; }
[data-look="apple"] .mode-switch { background: var(--surface-2); }
[data-look="apple"] .segmented button { border-radius: 999px; color: var(--text); font-weight: 500; }
[data-look="apple"] .segmented button[aria-checked="true"] { background: var(--seg-on); color: var(--text); font-weight: 600; box-shadow: 0 3px 8px rgba(0, 0, 0, .12); }
[data-look="apple"] .stepper { background: var(--surface-2); border-radius: 999px; }
[data-look="apple"] .stepper button { background: none; border-radius: 999px; color: var(--accent-text); font-weight: 500; }
[data-look="apple"] .stepper output { font-weight: 600; font-size: 19px; }
[data-look="apple"] [aria-checked="true"] > .switch { background: #34c759; }
[data-look="apple"] .chip { border: 0; font-weight: 600; }
[data-look="apple"] .back-link { color: var(--accent-text); font-weight: 400; }
[data-look="apple"] .hero h1 { font-weight: 700; font-size: 34px; letter-spacing: -.02em; }
[data-look="apple"] .box, [data-look="apple"] .tuner-card { border-radius: 22px; }
[data-look="apple"] .tuner-card { background: var(--surface); }
[data-look="apple"] .box h2 { font-weight: 600; }
[data-look="apple"] .note { font-family: var(--rounded); font-weight: 700; letter-spacing: -.02em; }
[data-look="apple"] .cents b { font-weight: 700; }
[data-look="apple"] .string-name { font-family: var(--rounded); font-weight: 700; font-size: 22px; }
[data-look="apple"] .string-btn { border-width: 1.5px; }
[data-look="apple"] .dir { font-weight: 600; }
[data-look="apple"] .status, [data-look="apple"] .hint { font-weight: 500; }
[data-look="apple"] .in-tune .status { font-weight: 700; }
[data-look="apple"] .alert { border-width: 1.5px; border-radius: 18px; }
[data-look="apple"] .sheet { border-radius: 30px 30px 0 0; }
[data-look="apple"] .sheet-head h3, [data-look="apple"] .modal h3 { font-family: var(--body); font-weight: 700; font-size: 20px; }
[data-look="apple"] .menu-item { font-weight: 400; font-size: 17px; }
[data-look="apple"] .menu-sub { font-weight: 400; }
[data-look="apple"] .close-btn { border-radius: 50%; }
[data-look="apple"] .modal { border-radius: 26px; text-align: center; }
[data-look="apple"] .toast { border-radius: 24px; }