/* UI Audit System Layer (non-destructive overrides) */

:root {
  --ui-radius-xs: 6px;
  --ui-radius-sm: 8px;
  --ui-radius-md: 10px;
  --ui-radius-lg: 14px;
  --ui-radius-xl: 18px;

  --ui-space-1: 4px;
  --ui-space-2: 8px;
  --ui-space-3: 12px;
  --ui-space-4: 16px;
  --ui-space-5: 20px;
  --ui-space-6: 24px;

  --ui-font-h1: clamp(2rem, 4vw, 2.75rem);
  --ui-font-h2: clamp(1.75rem, 3vw, 2.25rem);
  --ui-font-h3: clamp(1.35rem, 2.2vw, 1.75rem);
  --ui-font-body: 0.95rem;
  --ui-font-caption: 0.8rem;

  --ui-color-bg: var(--color-neutral-950);
  --ui-color-surface: rgba(23, 23, 23, 0.78);
  --ui-color-border: rgba(82, 82, 82, 0.72);
  --ui-color-text: var(--color-neutral-200);
  --ui-color-muted: var(--color-neutral-400);
  --ui-color-primary: var(--color-purple-500);
  --ui-color-primary-strong: var(--color-purple-600);
  --ui-color-success: #22c55e;
  --ui-color-danger: #ef4444;
  --ui-color-warning: #f59e0b;
  --ui-color-info: #38bdf8;

  --ui-ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ui-dur-fast: 140ms;
  --ui-dur-mid: 220ms;
}

html,
body {
  color: var(--ui-color-text);
  background: var(--ui-color-bg);
}

h1, .rechord-page-title {
  font-size: var(--ui-font-h1);
  line-height: 1.08;
  letter-spacing: -0.02em;
}
h2 {
  font-size: var(--ui-font-h2);
  line-height: 1.12;
}
h3 {
  font-size: var(--ui-font-h3);
  line-height: 1.18;
}
p, label, input, select, textarea, button {
  font-size: var(--ui-font-body);
}

/* Unified interactive transition */
.btn,
button,
[role='button'],
a.nav-tab,
.card-action-btn,
.reels-mode-btn,
.song-tab-toolbar-btn {
  transition:
    background-color var(--ui-dur-mid) var(--ui-ease-standard),
    border-color var(--ui-dur-mid) var(--ui-ease-standard),
    color var(--ui-dur-mid) var(--ui-ease-standard),
    box-shadow var(--ui-dur-mid) var(--ui-ease-standard),
    transform var(--ui-dur-fast) var(--ui-ease-standard);
}

.btn {
  border-radius: var(--ui-radius-md);
}

.btn-primary {
  background: var(--ui-color-primary);
  border-color: color-mix(in srgb, var(--ui-color-primary), #000 18%);
  color: #fff;
}
.btn-primary:hover {
  background: var(--ui-color-primary-strong);
}

.btn-secondary,
.btn-outline {
  border-color: var(--ui-color-border);
  background: color-mix(in srgb, var(--ui-color-surface), transparent 35%);
  color: var(--ui-color-text);
}
.btn-secondary:hover,
.btn-outline:hover {
  border-color: color-mix(in srgb, var(--ui-color-primary), #fff 25%);
  background: color-mix(in srgb, var(--ui-color-primary), transparent 88%);
}

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

.btn:disabled,
button:disabled,
[aria-disabled='true'] {
  opacity: 0.52;
  cursor: not-allowed;
  transform: none !important;
}

/* Inputs */
input,
textarea,
select,
.input,
.textarea {
  border-radius: var(--ui-radius-sm);
  border-color: var(--ui-color-border);
  color: var(--ui-color-text);
  background: color-mix(in srgb, var(--ui-color-bg), #fff 3%);
}
input::placeholder,
textarea::placeholder {
  color: var(--ui-color-muted);
}
input:hover,
textarea:hover,
select:hover,
.input:hover,
.textarea:hover {
  border-color: color-mix(in srgb, var(--ui-color-primary), #fff 28%);
}

/* Focus visibility/a11y */
:where(
  .btn,
  button,
  a,
  input,
  textarea,
  select,
  [role='button'],
  [tabindex]:not([tabindex='-1'])
):focus-visible {
  outline: 2px solid color-mix(in srgb, var(--ui-color-primary), #fff 15%);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ui-color-primary), transparent 72%);
}

.field-error,
[aria-invalid='true'] {
  border-color: color-mix(in srgb, var(--ui-color-danger), #fff 22%) !important;
}

/* Modal consistency */
.modal-content {
  border-radius: var(--ui-radius-lg);
  border-color: color-mix(in srgb, var(--ui-color-border), #000 10%);
}
.modal-header,
.modal-body,
.modal-footer {
  padding-left: var(--ui-space-4);
  padding-right: var(--ui-space-4);
}
.modal-header {
  padding-top: var(--ui-space-4);
}
.modal-footer {
  padding-bottom: max(var(--ui-space-4), env(safe-area-inset-bottom, 0px));
}

/* Icon normalization */
[data-lucide] {
  width: 1rem;
  height: 1rem;
  stroke-width: 2;
}
.btn [data-lucide],
button [data-lucide] {
  width: 1.05rem;
  height: 1.05rem;
}

/* Card/list consistency */
.card,
.chord-card,
.progression-card,
.rechord-panel,
.rechord-panel-soft {
  border-radius: var(--ui-radius-lg);
  border-color: color-mix(in srgb, var(--ui-color-border), #000 8%);
}

/* Motion accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }
}

/* Mobile guardrails */
@media (max-width: 768px) {
  button,
  .btn,
  [role='button'],
  .song-tab-toolbar-btn,
  .reels-mode-btn {
    min-height: 2.5rem;
  }

  input,
  textarea,
  select,
  .input {
    min-height: 2.5rem;
    font-size: 16px; /* iOS zoom prevention */
  }

  .modal-content {
    border-radius: var(--ui-radius-lg) var(--ui-radius-lg) 0 0;
  }
}

/* Community mobile feed: compact informative preview cards */
@media (max-width: 640px) {
  #communityFeed {
    grid-template-columns: 1fr !important;
    gap: 0.75rem !important;
  }

  .community-feed-skeleton {
    grid-template-columns: 1fr !important;
    gap: 0.75rem !important;
  }

  .progression-card {
    display: grid;
    grid-template-columns: 116px minmax(0, 1fr);
    min-height: 136px;
    border-radius: 12px;
  }

  .progression-card-thumb {
    aspect-ratio: auto !important;
    height: 100%;
    min-height: 136px;
    border-right: 1px solid color-mix(in srgb, var(--ui-color-border), #000 16%);
  }

  .progression-thumb-line {
    align-items: center;
  }

  .progression-thumb-meta {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 58%;
  }

  .progression-card > div:nth-child(2) {
    padding: 0.6rem 0.65rem 0.45rem;
    gap: 0.45rem;
  }

  .progression-card-title {
    -webkit-line-clamp: 1;
    line-height: 1.2;
    font-size: 0.95rem;
  }

  .progression-byline {
    margin-top: 0.15rem !important;
    gap: 0.3rem !important;
    line-height: 1.2;
  }

  .progression-meta {
    font-size: 10px;
    line-height: 1.25;
    -webkit-line-clamp: 1;
    margin-top: 0.25rem !important;
  }

  .progression-chords-preview {
    padding: 0.35rem;
  }

  .progression-card-actions {
    margin: 0 !important;
    padding: 0.35rem 0 0 !important;
    border-top-color: color-mix(in srgb, var(--ui-color-border), #000 24%) !important;
  }
}