/*
 * SponsorGap UI foundation — shared tokens and components for every page (loaded in layout.pug).
 * Use these instead of page-level button/card/header styles so pages look and behave the same.
 *
 *   Buttons:  .ui-btn + .ui-btn-primary | .ui-btn-secondary | .ui-btn-ghost | .ui-btn-danger  (+ .ui-btn-sm)
 *   Layout:   .ui-page-header > .ui-page-title + .ui-page-meta, .ui-page-actions
 *   Surfaces: .ui-card, .ui-badge (+ -success | -info | -warning | -danger)
 *   Forms:    .ui-label, .ui-input, .ui-help, .ui-error
 *   Text:     .ui-text-muted (meets 4.5:1 on white)
 */

:root {
  /* Colors — text greys chosen to pass WCAG AA (4.5:1) on white */
  --ui-text: #0f172a;          /* 17.9:1 */
  --ui-text-secondary: #475569; /* 7.6:1 */
  --ui-text-muted: #64748b;     /* 4.8:1 — lightest grey allowed for text */
  --ui-border: #e2e8f0;
  --ui-border-strong: #cbd5e1;
  --ui-surface: #ffffff;
  --ui-surface-subtle: #f8fafc;
  --ui-primary: #2563eb;
  --ui-primary-hover: #1d4ed8;
  --ui-primary-soft: #eff6ff;
  --ui-success: #15803d;
  --ui-success-soft: #dcfce7;
  --ui-warning: #b45309;
  --ui-warning-soft: #fef3c7;
  --ui-danger: #b91c1c;
  --ui-danger-soft: #fee2e2;
  --ui-focus: #2563eb;

  /* Shape and spacing */
  --ui-radius-sm: 6px;
  --ui-radius: 8px;
  --ui-radius-lg: 12px;
  --ui-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
}

/* ── Keyboard focus ─────────────────────────────────────────────────────────
 * Many pages remove outlines (focus:outline-none / outline:none). Restore a
 * visible ring for keyboard users only; mouse clicks don't trigger :focus-visible.
 * !important is needed to win over inline styles and Tailwind's focus utilities. */
:focus-visible {
  outline: 2px solid var(--ui-focus) !important;
  outline-offset: 2px !important;
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.ui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--ui-radius);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.25;
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s, transform 0.05s;
}
.ui-btn:active:not(:disabled) { transform: translateY(1px); }
.ui-btn:disabled,
.ui-btn[aria-disabled='true'] { opacity: 0.5; cursor: not-allowed; }
.ui-btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.ui-btn-sm { min-height: 32px; padding: 6px 12px; font-size: 0.8125rem; }

.ui-btn-primary { background: var(--ui-primary); color: #fff; }
.ui-btn-primary:hover:not(:disabled) { background: var(--ui-primary-hover); }

.ui-btn-secondary { background: var(--ui-surface); color: var(--ui-text); border-color: var(--ui-border-strong); }
.ui-btn-secondary:hover:not(:disabled) { background: var(--ui-surface-subtle); border-color: #94a3b8; }

.ui-btn-ghost { background: transparent; color: var(--ui-text-secondary); }
.ui-btn-ghost:hover:not(:disabled) { background: #f1f5f9; color: var(--ui-text); }

.ui-btn-danger { background: var(--ui-surface); color: var(--ui-danger); border-color: #fecaca; }
.ui-btn-danger:hover:not(:disabled) { background: var(--ui-danger-soft); }

/* Loading state: add .is-loading (and disabled) while a request runs */
.ui-btn.is-loading { position: relative; color: transparent !important; pointer-events: none; }
.ui-btn.is-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-color: #fff #fff transparent transparent;
  border-radius: 50%;
  animation: ui-spin 0.7s linear infinite;
}
.ui-btn-secondary.is-loading::after,
.ui-btn-ghost.is-loading::after,
.ui-btn-danger.is-loading::after { border-color: var(--ui-text-muted) var(--ui-text-muted) transparent transparent; }
@keyframes ui-spin { to { transform: rotate(360deg); } }

/* ── Page header: title + meta left, actions right; wraps on small screens ── */
.ui-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-bottom: 20px;
}
.ui-page-heading { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px 12px; min-width: 0; }
.ui-page-title { margin: 0; font-size: 1.375rem; font-weight: 700; line-height: 1.3; color: var(--ui-text); }
.ui-page-meta { font-size: 0.875rem; color: var(--ui-text-muted); }
.ui-page-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; }

/* ── Surfaces ─────────────────────────────────────────────────────────────── */
.ui-card {
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius-lg);
  box-shadow: var(--ui-shadow);
  padding: 20px;
}

.ui-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.5;
  white-space: nowrap;
  background: #f1f5f9;
  color: var(--ui-text-secondary);
}
.ui-badge-success { background: var(--ui-success-soft); color: var(--ui-success); }
.ui-badge-info { background: var(--ui-primary-soft); color: var(--ui-primary-hover); }
.ui-badge-warning { background: var(--ui-warning-soft); color: var(--ui-warning); }
.ui-badge-danger { background: var(--ui-danger-soft); color: var(--ui-danger); }

/* ── Forms ────────────────────────────────────────────────────────────────── */
.ui-label { display: block; margin-bottom: 6px; font-size: 0.875rem; font-weight: 600; color: var(--ui-text); }
.ui-input {
  display: block;
  width: 100%;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid var(--ui-border-strong);
  border-radius: var(--ui-radius);
  background: var(--ui-surface);
  color: var(--ui-text);
  font-size: 0.875rem;
}
.ui-input::placeholder { color: var(--ui-text-muted); }
.ui-input:focus { border-color: var(--ui-primary); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15); outline: none; }
.ui-input[aria-invalid='true'] { border-color: var(--ui-danger); }
.ui-help { margin-top: 6px; font-size: 0.8125rem; color: var(--ui-text-muted); }
.ui-error { margin-top: 6px; font-size: 0.8125rem; color: var(--ui-danger); }

.ui-text-muted { color: var(--ui-text-muted); }

/* ── Tabs: underline style; scrolls sideways on small screens instead of overflowing ──
 *   .ui-tabs(role="tablist") > button.ui-tab(role="tab" :aria-selected="…") */
.ui-tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--ui-border);
  overflow-x: auto;
  scrollbar-width: none;
}
.ui-tabs::-webkit-scrollbar { display: none; }
.ui-tab {
  flex-shrink: 0;
  margin-bottom: -1px;
  padding: 10px 16px;
  border: none;
  border-bottom: 2px solid transparent;
  background: none;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ui-text-muted);
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.ui-tab:hover { color: var(--ui-text); }
.ui-tab[aria-selected='true'] { color: var(--ui-primary); border-bottom-color: var(--ui-primary); }

/* ── Empty state: say what's missing and, where possible, what to do next ──
 *   .ui-empty > .ui-empty-title + .ui-empty-text (+ optional action button) */
.ui-empty { padding: 24px 16px; text-align: center; }
.ui-empty-title { margin: 0 0 4px; font-size: 0.9375rem; font-weight: 700; color: var(--ui-text-secondary); }
.ui-empty-text { margin: 0 auto; max-width: 380px; font-size: 0.8125rem; color: var(--ui-text-muted); }
.ui-empty > .ui-btn { margin-top: 12px; }

/* ── Inline error: shown when a request fails, usually with a Retry button ── */
.ui-alert-error {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 12px 16px;
  border: 1px solid #fecaca;
  border-radius: var(--ui-radius);
  background: var(--ui-danger-soft);
  color: var(--ui-danger);
  font-size: 0.875rem;
  font-weight: 500;
}

/* Respect users who turn off animations (spinners keep running: they signal loading) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}