/* common.css — shared design tokens and base components
   Loaded before per-page <style> blocks; pages override as needed. */

/* ===== Design tokens ===== */
:root {
  --bg: #f0f4f8;
  --surface: #ffffff;
  --surface-hover: #f8fafc;
  --border: rgba(0,0,0,0.06);
  --text: #1e293b;
  --text-secondary: #4a5568;
  --accent: #0d9488;
  --accent-hover: #0f766e;
  --accent-soft: rgba(13, 148, 136, 0.12);
  --success: #059669;
  --success-soft: rgba(5, 150, 105, 0.14);
  --warning: #d97706;
  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.1);
  --correct: #16a34a;
  --correct-soft: rgba(22, 163, 74, 0.15);
  --wrong: #dc2626;
  --wrong-soft: rgba(220, 38, 38, 0.12);
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.btn:hover:not(:disabled) { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

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

.btn-secondary {
  background: var(--surface);
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }

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

.refresh-btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
}
.refresh-btn:hover { background: var(--accent-soft); color: var(--accent); }

/* ===== Modal ===== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 20px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.modal-overlay.visible { display: flex; }

.modal-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 480px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}
.modal-card h3 { margin: 0 0 16px; font-size: 1.125rem; }

/* ===== Toast ===== */
.toast-notification {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 20px;
  background: var(--text);
  color: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  max-width: min(92vw, 420px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.22);
  z-index: 99999;
  opacity: 0;
  transition: opacity 0.2s ease;
  text-align: center;
  line-height: 1.4;
  pointer-events: none;
}
.toast-notification.visible { opacity: 1; pointer-events: auto; }
.toast-notification.toast-success { background: var(--success); }
.toast-notification.toast-error { background: var(--danger); }

/* ===== Tables ===== */
.table-wrap { overflow-x: auto; }

table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }

th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { font-weight: 600; color: var(--text-secondary); white-space: nowrap; }
td { vertical-align: top; }

th.sortable { cursor: pointer; user-select: none; }
th.sortable:hover { color: var(--accent); }
th .sort-icon { opacity: 0.5; margin-left: 4px; font-size: 0.75em; }
th.sorted-asc .sort-icon::after { content: ' ▲'; opacity: 1; }
th.sorted-desc .sort-icon::after { content: ' ▼'; opacity: 1; }

tbody tr:hover td { background: var(--accent-soft); }

/* ===== Pagination ===== */
.pagination-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  padding: 10px 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}
.pagination-bar button {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.875rem;
  cursor: pointer;
  font-family: inherit;
  color: var(--text);
}
.pagination-bar button:hover:not(:disabled) { background: var(--accent-soft); color: var(--accent); }
.pagination-bar button:disabled { opacity: 0.5; cursor: not-allowed; }
.pagination-bar select {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-family: inherit;
}

/* ===== Filter / search bar ===== */
.filter-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.filter-row input,
.filter-row select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-family: inherit;
  background: var(--surface);
}
.filter-row input:focus,
.filter-row select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

/* ===== Card ===== */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

/* ===== Utility ===== */
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--accent); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  body { padding: 16px; }
  .modal-overlay { padding: 12px; }
  .modal-card { padding: 18px; border-radius: var(--radius-sm); }
}