/* ============================================================
   Smart Student Planner – Main Stylesheet
   ============================================================ */

/* ─── 1. Design Tokens ─────────────────────────────────────── */
:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #eff6ff;
  --success: #22c55e;
  --success-light: #f0fdf4;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --purple: #8b5cf6;
  --purple-light: #f5f3ff;

  --bg: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;

  --text: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --sidebar-w: 240px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.05);
  --shadow-md: 0 4px 16px rgba(0,0,0,.1);

  --font: 'Inter', system-ui, -apple-system, sans-serif;
}

/* ─── 2. Reset & Base ───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── 3. App Layout ─────────────────────────────────────────── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ─── 4. Sidebar ────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  background: #1e293b;
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 200;
  transition: transform .25s ease;
}

.sidebar-header {
  padding: 1.5rem 1.25rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.brand {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.brand-icon { font-size: 1.75rem; }
.brand-name {
  font-size: .95rem;
  font-weight: 700;
  color: #f1f5f9;
  line-height: 1.25;
}

.nav-links {
  list-style: none;
  padding: 1rem 0;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .7rem 1.25rem;
  color: #94a3b8;
  font-size: .9rem;
  font-weight: 500;
  transition: all .2s;
  border-left: 3px solid transparent;
  text-decoration: none;
}

.nav-link:hover {
  background: rgba(255,255,255,.06);
  color: #f1f5f9;
  text-decoration: none;
}

.nav-link.active {
  background: rgba(59,130,246,.15);
  color: #60a5fa;
  border-left-color: #3b82f6;
}

.nav-icon { font-size: 1.1rem; width: 1.5rem; text-align: center; }

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(255,255,255,.08);
}

.user-info {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: .5rem;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.user-name {
  font-size: .85rem;
  font-weight: 600;
  color: #f1f5f9;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role { font-size: .75rem; color: #64748b; }

.btn-logout {
  width: 100%;
  padding: .45rem 1rem;
  background: transparent;
  border: 1px solid rgba(255,255,255,.15);
  color: #94a3b8;
  border-radius: var(--radius-sm);
  font-size: .8rem;
  cursor: pointer;
  transition: all .2s;
}

.btn-logout:hover {
  background: rgba(239,68,68,.15);
  border-color: rgba(239,68,68,.4);
  color: #fca5a5;
}

/* ─── 5. Mobile Top Bar ─────────────────────────────────────── */
.topbar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: #1e293b;
  color: #f1f5f9;
  align-items: center;
  padding: 0 1rem;
  gap: 1rem;
  z-index: 150;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}

.hamburger {
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 1.4rem;
  cursor: pointer;
  padding: .2rem;
}

.topbar-title { font-weight: 700; font-size: 1rem; flex: 1; }
.topbar-user { font-size: .85rem; color: #64748b; }

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 190;
}

/* ─── 6. Main Content ───────────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  padding: 2rem;
  max-width: 100%;
}

/* ─── 7. Messages ───────────────────────────────────────────── */
.messages-container { margin-bottom: 1.5rem; }

.alert {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  margin-bottom: .5rem;
  font-weight: 500;
}

.alert-success { background: var(--success-light); color: #166534; border-left: 4px solid var(--success); }
.alert-error, .alert-warning { background: var(--danger-light); color: #991b1b; border-left: 4px solid var(--danger); }
.alert-info { background: var(--primary-light); color: #1e40af; border-left: 4px solid var(--primary); }

.alert-close {
  background: none; border: none; cursor: pointer;
  font-size: 1.2rem; color: inherit; opacity: .6; padding: 0 .25rem;
}
.alert-close:hover { opacity: 1; }

/* ─── 8. Page Header ────────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  gap: 1rem;
}

.page-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: .25rem;
}

.page-subtitle { color: var(--text-muted); font-size: .9rem; }

/* ─── 9. Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .55rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all .2s;
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(59,130,246,.3);
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; }

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

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
}
.btn-outline:hover { background: var(--bg); border-color: var(--primary); color: var(--primary); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }

.btn-sm { padding: .35rem .85rem; font-size: .8rem; }
.btn-block { width: 100%; justify-content: center; margin-top: .5rem; }

/* ─── 10. Cards ─────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-title { font-size: 1rem; font-weight: 700; color: var(--text); }
.card-link { font-size: .8rem; color: var(--primary); }

/* ─── 11. Stats Grid ────────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: .4rem;
  box-shadow: var(--shadow);
}

.stat-blue { border-top: 3px solid var(--primary); }
.stat-green { border-top: 3px solid var(--success); }
.stat-orange { border-top: 3px solid var(--warning); }
.stat-purple { border-top: 3px solid var(--purple); }

.stat-icon { font-size: 1.4rem; }
.stat-value { font-size: 2rem; font-weight: 800; color: var(--text); line-height: 1; }
.stat-label { font-size: .8rem; color: var(--text-muted); font-weight: 500; }

/* ─── 12. Progress Card ─────────────────────────────────────── */
.progress-card .card-header { margin-bottom: .5rem; }
.progress-pct { font-size: 1.2rem; font-weight: 800; color: var(--primary); }

.progress-bar-track {
  height: 10px;
  background: var(--border-light);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: .4rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
  border-radius: 99px;
  transition: width .6s ease;
}

.progress-hint { font-size: .8rem; color: var(--text-muted); }

/* ─── 13. Suggestion Card ───────────────────────────────────── */
.suggestion-card {
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  border: 1px solid #bfdbfe;
}

.suggestion-label { font-size: .75rem; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: .05em; margin-bottom: .25rem; }
.suggestion-title { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: .25rem; }
.suggestion-meta { font-size: .85rem; color: var(--text-muted); margin-bottom: .75rem; }
.suggestion-actions { display: flex; gap: .5rem; }

/* ─── 14. Dashboard Grid ────────────────────────────────────── */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

/* ─── 15. Task Rows (Dashboard) ─────────────────────────────── */
.section-label {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin: .75rem 0 .4rem;
}

.today-label { color: var(--primary); }
.overdue-label { color: var(--danger); }

.task-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border-light);
}

.task-row:last-child { border-bottom: none; }

.check-btn {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: none;
  cursor: pointer;
  font-size: .75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all .2s;
}
.check-btn:hover { border-color: var(--success); color: var(--success); }

.task-info { flex: 1; min-width: 0; }
.task-title { display: block; font-size: .875rem; font-weight: 500; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.task-sub { font-size: .75rem; color: var(--text-muted); }

.overdue-row .task-title { color: var(--danger); }
.overdue-text { color: var(--danger); }

/* ─── 16. Exam Rows (Dashboard) ─────────────────────────────── */
.exam-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--border-light);
}
.exam-row:last-child { border-bottom: none; }

.exam-countdown { width: 60px; text-align: center; }
.countdown {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: var(--radius-sm);
  padding: .15rem .5rem;
  font-size: .75rem;
  font-weight: 700;
}
.today-count { background: #fee2e2; color: var(--danger); }
.soon-count { background: #ffedd5; color: #c2410c; }

.exam-info { flex: 1; }
.exam-name { display: block; font-size: .875rem; font-weight: 500; color: var(--text); }
.exam-sub { font-size: .75rem; color: var(--text-muted); }

/* ─── 17. Badges ────────────────────────────────────────────── */
.badge {
  display: inline-block;
  padding: .15rem .55rem;
  border-radius: 99px;
  font-size: .72rem;
  font-weight: 700;
  white-space: nowrap;
}

.badge-high { background: #fee2e2; color: #991b1b; }
.badge-medium { background: #ffedd5; color: #92400e; }
.badge-low { background: #f0fdf4; color: #166534; }
.badge-overdue { background: #fee2e2; color: #991b1b; }
.badge-today { background: #dbeafe; color: #1e40af; }
.badge-tomorrow { background: #fef9c3; color: #854d0e; }

/* ─── 18. Task List (Task Page) ─────────────────────────────── */
.filter-tabs {
  display: flex;
  gap: .5rem;
  margin-bottom: 1.25rem;
}

.filter-tab {
  padding: .4rem 1rem;
  border-radius: 99px;
  font-size: .85rem;
  font-weight: 600;
  border: 1.5px solid var(--border);
  color: var(--text-secondary);
  background: var(--bg-card);
  text-decoration: none;
  transition: all .2s;
}

.filter-tab:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }
.filter-tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.task-list-container { display: flex; flex-direction: column; gap: .75rem; }

.task-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  box-shadow: var(--shadow);
  transition: box-shadow .2s;
}

.task-card:hover { box-shadow: var(--shadow-md); }
.task-overdue { border-left: 4px solid var(--danger); background: #fff8f8; }
.task-today { border-left: 4px solid var(--primary); }
.task-done { opacity: .7; }

.task-check {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: none;
  cursor: pointer;
  font-size: .85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: .1rem;
  transition: all .2s;
}
.task-check:hover { border-color: var(--success); color: var(--success); background: var(--success-light); }
.task-check-done { background: var(--success); border-color: var(--success); color: #fff; }
.task-check-done:hover { background: #16a34a; }

.task-body { flex: 1; min-width: 0; }

.task-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .5rem;
  margin-bottom: .3rem;
  flex-wrap: wrap;
}

.task-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.task-badges { display: flex; gap: .35rem; flex-wrap: wrap; }

.task-meta {
  display: flex;
  gap: .75rem;
  font-size: .8rem;
  color: var(--text-muted);
  margin-bottom: .25rem;
  flex-wrap: wrap;
}

.task-description {
  font-size: .85rem;
  color: var(--text-secondary);
  margin-top: .35rem;
  background: var(--bg);
  padding: .5rem .75rem;
  border-radius: var(--radius-sm);
}

.task-actions {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  flex-shrink: 0;
}

.text-strikethrough { text-decoration: line-through; color: var(--text-muted); }

/* ─── 19. Exam Cards (Exam Page) ────────────────────────────── */
.section-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
}

.exam-list { display: flex; flex-direction: column; gap: .75rem; }

.exam-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  box-shadow: var(--shadow);
}

.exam-today { border-left: 4px solid var(--danger); background: #fff8f8; }
.exam-soon { border-left: 4px solid var(--warning); }
.exam-past { opacity: .65; }

.exam-countdown-box {
  min-width: 70px;
  text-align: center;
}

.big-count {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.count-label { font-size: .7rem; color: var(--text-muted); font-weight: 600; }
.red-count { color: var(--danger); }
.orange-count { color: var(--warning); }
.muted-count { color: var(--text-muted); font-size: 1rem; }

.exam-details { flex: 1; min-width: 0; }
.exam-card-name { font-size: 1rem; font-weight: 700; margin-bottom: .3rem; }
.exam-card-meta { display: flex; gap: .75rem; font-size: .8rem; color: var(--text-muted); flex-wrap: wrap; }
.exam-notes { font-size: .82rem; color: var(--text-secondary); margin-top: .35rem; }

.exam-card-actions { display: flex; gap: .5rem; flex-shrink: 0; flex-wrap: wrap; }

/* ─── 20. Study Plan ────────────────────────────────────────── */
.date-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .85rem 1.25rem;
  box-shadow: var(--shadow);
}

.date-display {
  flex: 1;
  text-align: center;
  font-weight: 600;
  font-size: .95rem;
  color: var(--text);
}

.study-summary {
  display: flex;
  gap: 1.5rem;
  font-size: .9rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  padding: .6rem 1.25rem;
  margin-bottom: 1rem;
}

.study-list { display: flex; flex-direction: column; gap: .65rem; }

.study-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  box-shadow: var(--shadow);
}

.study-done { background: var(--success-light); border-color: #bbf7d0; opacity: .8; }

.study-time-col { min-width: 70px; text-align: center; }
.study-time { display: block; font-size: 1rem; font-weight: 700; color: var(--primary); }
.study-dur { font-size: .75rem; color: var(--text-muted); }

.study-body { flex: 1; }
.study-subject { font-size: .95rem; font-weight: 600; }
.study-badge-done { font-size: .75rem; color: var(--success); font-weight: 600; }

.study-actions { display: flex; gap: .35rem; flex-wrap: wrap; justify-content: flex-end; }

/* ─── 21. Forms ─────────────────────────────────────────────── */
.form-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 2rem;
  max-width: 680px;
  box-shadow: var(--shadow);
}

.form-group { margin-bottom: 1.25rem; }

.form-label {
  display: block;
  font-size: .875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: .4rem;
}

.form-input {
  width: 100%;
  padding: .65rem .9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59,130,246,.12);
  background: #fff;
}

.form-select { cursor: pointer; }

textarea.form-input { resize: vertical; min-height: 80px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-hint { font-size: .78rem; color: var(--text-muted); margin-top: .3rem; }

.form-actions {
  display: flex;
  gap: .75rem;
  padding-top: .5rem;
}

.field-error {
  font-size: .8rem;
  color: var(--danger);
  margin-top: .3rem;
  font-weight: 500;
}

/* ─── 22. Auth Pages ────────────────────────────────────────── */
.auth-layout {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 50%, #f0fdf4 100%);
  padding: 1rem;
}

.auth-card {
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-md);
}

.auth-card-wide { max-width: 620px; }

.auth-logo { font-size: 3rem; text-align: center; margin-bottom: .5rem; }
.auth-title { font-size: 1.5rem; font-weight: 800; text-align: center; margin-bottom: .25rem; }
.auth-subtitle { font-size: .9rem; color: var(--text-muted); text-align: center; margin-bottom: 1.75rem; }
.auth-link { text-align: center; margin-top: 1.25rem; font-size: .875rem; color: var(--text-muted); }

.auth-divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: 1.25rem 0;
  color: var(--text-muted);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border);
}
.auth-divider span {
  padding: 0 .75rem;
}

.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  width: 100%;
  padding: .65rem 1rem;
  background: #ffffff;
  color: #374151;
  border: 1px solid #d1d5db;
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all .2s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .05);
}
.btn-google:hover {
  background: #f9fafb;
  border-color: #9ca3af;
  box-shadow: 0 2px 4px rgba(0, 0, 0, .08);
  color: #111827;
}
.btn-google svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.auth-brand-badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .35rem .85rem;
  background: #eff6ff;
  color: var(--primary);
  border: 1px solid #dbeafe;
  border-radius: 99px;
  font-size: .82rem;
  font-weight: 600;
  margin: 0 auto .75rem auto;
}

.auth-header-wrap {
  text-align: center;
  margin-bottom: 1.5rem;
}

.auth-options {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  margin-bottom: 1rem;
}

.btn-email-option {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .75rem;
  width: 100%;
  padding: .65rem 1rem;
  background: #ffffff;
  color: #1e293b;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .04);
}
.btn-email-option:hover {
  background: #f8fafc;
  border-color: #94a3b8;
  color: #0f172a;
  box-shadow: 0 2px 4px rgba(0, 0, 0, .08);
}
.btn-email-option svg {
  color: var(--primary);
  width: 18px;
  height: 18px;
}

.email-auth-box {
  animation: fadeInDown .25s ease-out;
  border-top: 1px dashed var(--border);
  padding-top: 1.25rem;
  margin-top: .75rem;
}

.auth-back-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  background: none;
  border: none;
  padding: 0;
  color: var(--text-muted);
  font-size: .825rem;
  cursor: pointer;
  margin-bottom: 1rem;
  transition: color .15s ease;
}
.auth-back-link:hover {
  color: var(--primary);
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hidden {
  display: none !important;
}

/* ─── 23. Empty State ───────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 3.5rem 1rem;
}

.empty-icon { font-size: 3.5rem; margin-bottom: .75rem; }
.empty-title { font-size: 1.25rem; font-weight: 700; margin-bottom: .5rem; }
.empty-msg { color: var(--text-muted); font-size: .9rem; margin-bottom: 1.25rem; }

.empty-state-small { text-align: center; padding: 1rem; color: var(--text-muted); font-size: .875rem; }

/* ─── 24. Delete Confirm ────────────────────────────────────── */
.page-center { display: flex; justify-content: center; align-items: center; min-height: 60vh; }

.confirm-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 2.5rem 2rem;
  max-width: 440px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.confirm-icon { font-size: 3rem; margin-bottom: .75rem; }
.confirm-title { font-size: 1.4rem; font-weight: 800; margin-bottom: .5rem; }
.confirm-msg { color: var(--text-secondary); font-size: .9rem; margin-bottom: 1.75rem; line-height: 1.6; }
.confirm-actions { display: flex; gap: .75rem; justify-content: center; }

/* ─── 25. Misc Utilities ────────────────────────────────────── */
.text-muted { color: var(--text-muted); }
.past-list { opacity: .7; }

/* ─── 26. Responsive ────────────────────────────────────────── */
@media (max-width: 900px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,.3);
  }
  .sidebar-overlay.open { display: block; }

  .topbar { display: flex; }
  .main-content { margin-left: 0; padding: 1rem; padding-top: 72px; }

  .page-header { flex-direction: column; }
  .form-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: .75rem; }

  .exam-card { flex-direction: column; align-items: flex-start; }
  .task-card { flex-wrap: wrap; }
  .task-actions { flex-direction: row; }
  .date-nav { flex-direction: column; gap: .5rem; }
  .date-display { text-align: center; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .auth-card, .auth-card-wide { padding: 1.75rem 1.25rem; }
  .form-card { padding: 1.25rem; }
  .filter-tabs { flex-wrap: wrap; }
}

/* ─── 24. 12-Hour AM/PM Time Picker ──────────────────────────── */
.time-picker-wrapper {
  margin-top: 0.15rem;
}

.time-picker-inputs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.time-picker-inputs .time-select {
  flex: 1;
  min-width: 75px;
  text-align: center;
  font-weight: 600;
  cursor: pointer;
  padding: 0.55rem 0.5rem;
}

.time-sep {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-muted);
}

.time-ampm-select {
  background-color: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 700;
  border-color: #bfdbfe;
}