/* ══════════════════════════════════════════════════════════════════════
   EnglishWithDan — Shared Components
   Token-driven, canonical definitions for Button, Card, Badge, Table,
   Pagination, Tabs, Skeleton, Empty State, Spinner, and the Modal/Toast
   visual shell. Consumes css/tokens.css — load tokens.css first.

   This file replaces the duplicated .btn/.card/.badge/.toast/table
   definitions that previously lived independently in dashboard.css and
   mobile.css with different padding/radius/font-size (audit UI#2/#48).
   Canonical dimensions below match dashboard.css's system (already the
   more token-driven of the two) — see docs/design-system.md for the
   full before/after and which pages have a visible sizing change.
   ══════════════════════════════════════════════════════════════════════ */

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-body-sm);
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-family: inherit;
  text-decoration: none;
  white-space: nowrap;
  transition: var(--transition);
}
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn-primary   { background: var(--brand); color: #fff; }
.btn-primary:hover   { background: var(--brand-dark); }

.btn-blue      { background: var(--blue); color: #fff; }
.btn-blue:hover      { background: var(--blue-dark); }

.btn-green     { background: var(--green); color: #fff; }
.btn-green:hover     { background: #16a34a; }
.btn-success   { background: var(--success); color: #fff; }
.btn-success:hover   { background: #15803d; }

/* Secondary / Ghost: same role, two names in use across the codebase — kept both. */
.btn-secondary,
.btn-ghost     { background: var(--surface); color: var(--text2); border: 1px solid var(--border); }
.btn-secondary:hover,
.btn-ghost:hover     { border-color: var(--border2); color: var(--text); }

/* --brand-light is an rgba tint (not solid hex), so this adapts correctly
   in dark mode automatically — no [data-theme="dark"] override needed. */
.btn-danger    { background: var(--brand-light); color: var(--brand); border: 1px solid rgba(229,57,53,.35); }
.btn-danger:hover    { background: rgba(229,57,53,.2); }

.btn-sm   { padding: 5px 11px; font-size: var(--fs-micro); }
.btn-lg   { padding: 13px 28px; font-size: 16px; }
.btn-icon { padding: 8px; width: 36px; height: 36px; }
.btn-full { width: 100%; }

/* ── Inputs ─────────────────────────────────────────────────────────── */
.form-group { margin-bottom: var(--space-4); }
.form-label {
  display: block;
  font-size: var(--fs-body-sm);
  font-weight: 500;
  color: var(--text);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: var(--fs-body);
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  transition: var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-light);
}
.form-control::placeholder { color: var(--text2); }
textarea.form-control { resize: vertical; min-height: 100px; }

/* ── Cards ──────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card-body { padding: 20px; }

.stat-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-4);
}
.stat-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat-card .stat-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}
.stat-card .stat-value  { font-size: 28px; font-weight: 700; line-height: 1; }
.stat-card .stat-label  { font-size: var(--fs-body-sm); color: var(--text2); }
.stat-card .stat-change { font-size: var(--fs-caption); font-weight: 600; }
.stat-card .stat-change.up   { color: var(--success); }
.stat-card .stat-change.down { color: var(--danger); }

/* ── Badges / Status labels ─────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--fs-caption);
  font-weight: 600;
}
.badge-primary { background: var(--brand-light);   color: var(--brand); }
.badge-success { background: var(--success-light); color: var(--success); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-danger  { background: var(--danger-light);  color: var(--danger); }

/* ── Tables ─────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.responsive-table { min-width: 600px; width: 100%; border-collapse: collapse; }
table.responsive-table th,
table.responsive-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: var(--fs-body);
}
table.responsive-table thead th {
  background: var(--bg);
  font-weight: 600;
  color: var(--text2);
  font-size: var(--fs-body-sm);
  text-transform: uppercase;
  letter-spacing: .5px;
}
table.responsive-table tbody tr:hover { background: var(--bg); }

/* ── Pagination ─────────────────────────────────────────────────────── */
.pagination { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.pagination button {
  min-width: 34px; height: 34px; padding: 0 9px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text2);
  font-size: var(--fs-body-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.pagination button:hover:not(:disabled) { border-color: var(--border2); color: var(--text); }
.pagination button.active { background: var(--brand); border-color: var(--brand); color: #fff; }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

/* ── Tabs ───────────────────────────────────────────────────────────── */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); }
.tab-btn {
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--text2);
  font-size: var(--fs-body-sm);
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}
.tab-btn:hover  { color: var(--text); }
.tab-btn.active { color: var(--brand); border-bottom-color: var(--brand); }

/* ── Skeleton loading ───────────────────────────────────────────────── */
@keyframes shimmer { 0% { background-position: -400px 0; } 100% { background-position: 400px 0; } }
.skeleton,
.skeleton-cell {
  height: 14px;
  border-radius: var(--radius-sm);
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 800px 100%;
  animation: shimmer 1.4s infinite linear;
}
[data-theme="dark"] .skeleton,
[data-theme="dark"] .skeleton-cell {
  background: linear-gradient(90deg, var(--border2, #333333) 25%, #4b5563 50%, var(--border2, #333333) 75%);
  background-size: 800px 100%;
}

/* ── Empty state ────────────────────────────────────────────────────── */
.state-empty {
  text-align: center;
  padding: var(--space-7) var(--space-4);
  color: var(--text2);
}
.state-empty .empty-icon { font-size: 40px; margin-bottom: var(--space-3); opacity: .6; }
.state-empty .empty-title { font-size: var(--fs-h3); font-weight: 700; color: var(--text); margin-bottom: 4px; }
.state-empty .empty-action { margin-top: var(--space-4); }

/* ── Error state (inline) ───────────────────────────────────────────── */
.state-error {
  text-align: center;
  padding: var(--space-6) var(--space-4);
  color: var(--danger);
}
.state-error .retry-btn { margin-top: var(--space-3); }

/* ── Spinner ────────────────────────────────────────────────────────── */
/* 40px matches mobile.css's version, which was the one actually rendering
   on all 12 pages (mobile.css loaded after this file and won the cascade)
   — mobile.css's own duplicate .spinner has been removed, this is now
   the only definition. */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.spinner-sm { width: 18px; height: 18px; border-width: 2px; }

/* ── Loading overlay (full-screen, e.g. "submitting exam…") ──────────── */
.loading-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.4);
  display: flex; align-items: center; justify-content: center;
  z-index: var(--z-modal);
}

/* ── Modal shell (styling only — behavior stays per-page for now) ──────
   Canonical values below match dashboard.css's implementation exactly
   (it had the fuller header/body/footer structure of the two competing
   systems found during the Phase 2 audit) — dashboard.css's own copy of
   this block has been removed so this is now the only definition. */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center;
  z-index: var(--z-modal);
  padding: var(--space-4);
  backdrop-filter: blur(3px);
}
.modal-box {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  max-height: 90vh;
  overflow: hidden;
  display: flex; flex-direction: column;
  animation: modal-pop .18s ease;
}
@keyframes modal-pop { from { transform: scale(.93); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-sm { width: min(420px, 100%); }
.modal-md { width: min(560px, 100%); }
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px 0;
}
.modal-header h3 { font-size: var(--fs-h3); font-weight: 700; }
.modal-close {
  background: none; border: none; cursor: pointer;
  font-size: 20px; color: var(--text3); padding: 4px; border-radius: var(--radius-sm);
}
.modal-close:hover { color: var(--text); }
.modal-body   { padding: 18px 24px; overflow-y: auto; flex: 1; }
.modal-footer {
  padding: 14px 24px; border-top: 1px solid var(--border);
  display: flex; justify-content: flex-end; gap: 10px;
}
.modal-lg { width: min(880px, 100%); }

/* ── Toast shell (styling only — see migration notes for JS unification plan) ── */
.toast-container {
  position: fixed;
  bottom: var(--space-5); right: var(--space-5);
  z-index: var(--z-toast);
  display: flex; flex-direction: column; gap: 10px;
  max-width: 360px;
}
.toast {
  display: flex; align-items: flex-start; gap: 12px;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  animation: toast-in var(--duration-base) ease;
  transition: var(--transition);
}
@keyframes toast-in { from { transform: translateY(8px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.toast.hiding { animation: toast-out .3s ease forwards; }
@keyframes toast-out { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(20px); } }
.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast.info    { border-left: 3px solid var(--blue); }
.toast-icon  { font-size: 20px; flex-shrink: 0; }
.toast-body  { flex: 1; }
.toast-title { font-weight: 700; font-size: var(--fs-body-sm); margin-bottom: 2px; }
.toast-msg   { font-size: var(--fs-caption); color: var(--text2); }

/* ── Icon sizing (Font Awesome is the one icon system in use — see
       docs/design-system.md "Icons" for the emoji-vs-icon guideline) ── */
.icon-sm { font-size: 14px; }
.icon-md { font-size: 18px; }
.icon-lg { font-size: 24px; }