/* ===============================
   CSS CUSTOM PROPERTIES
   =============================== */

:root {
  /* ── School colours ──────────────────────── */
  --primary:        #2e7d32;
  --primary-dark:   #1b5e20;
  --primary-light:  #e8f5e9;
  --gold:           #c9a227;
  --gold-dark:      #a88419;
  --gold-light:     #fffde7;

  /* ── Status colours ──────────────────────── */
  --success:        #27ae60;
  --success-dark:   #1e8449;
  --danger:         #e53e3e;
  --danger-dark:    #c0392b;
  --warning:        #c9a227;
  --warning-dark:   #a88419;
  --secondary:      #718096;
  --secondary-dark: #4a5568;

  /* ── Surfaces & layout ───────────────────── */
  --nav-bg:          #1b3a1b;
  --nav-bg-dark:     #0d1f0d;
  --surface:         #ffffff;
  --surface-dark:    #1e2a1e;
  --bg:              #f2f7f2;
  --bg-dark:         #141a14;
  --text:            #1a2e1a;
  --text-dark:       #deeade;
  --text-muted:      #6b7c6b;
  --text-muted-dark: #9bb09b;
  --border:          #d0dbd0;
  --border-dark:     #2d3e2d;
  --table-head:      #f0f5f0;
  --table-head-dark: #1e2a1e;
  --input-bg-dark:   #243024;

  /* ── Shape ───────────────────────────────── */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;

  /* ── Elevation ───────────────────────────── */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow:    0 2px 10px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.05);
  --shadow-md: 0 6px 24px rgba(0,0,0,.10), 0 2px 8px rgba(0,0,0,.06);

  --transition: 0.18s ease;
}

/* ===============================
   GLOBAL RESET & BASE
   =============================== */

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 15px;
  transition: background var(--transition), color var(--transition);
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  margin-top: 0;
  color: var(--text);
  transition: color var(--transition);
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.05rem; }

a { color: var(--primary); transition: opacity var(--transition); }
a:hover { opacity: 0.8; }

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary);
  color: white;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
}
.skip-link:focus { top: 6px; }

.page {
  padding: 28px 24px;
  max-width: 1120px;
  margin: auto;
}

.content { width: 100%; }

/* ===============================
   NAVIGATION BAR
   =============================== */

.navbar {
  background: var(--nav-bg);
  color: white;
  padding: 0 28px;
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 20px;
  border-bottom: 3px solid var(--gold);
  min-height: 58px;
  transition: background var(--transition);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,.25);
}

.brand {
  display: flex;
  align-items: center;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--gold);
  gap: 8px;
}

.brand a {
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-icon {
  font-size: 22px;
  line-height: 1;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-right a {
  color: rgba(255,255,255,.85);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.nav-right a:hover {
  background: rgba(255,255,255,.1);
  color: white;
  opacity: 1;
}

.nav-right a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.user-label {
  color: rgba(255,255,255,.55);
  font-size: 13px;
  padding: 6px 6px 6px 10px;
  border-right: 1px solid rgba(255,255,255,.12);
  margin-right: 4px;
}

/* ===============================
   AUTH PAGES (login / register)
   =============================== */

.auth-card {
  max-width: 440px;
  margin: 48px auto;
  padding: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.auth-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 36px 32px 28px;
  text-align: center;
  color: white;
  position: relative;
}

.auth-header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0; right: 0;
  height: 3px;
  background: var(--gold);
}

.auth-logo {
  font-size: 52px;
  margin-bottom: 10px;
  display: block;
}

.auth-header h2 {
  color: white;
  margin: 0 0 4px;
  font-size: 22px;
}

.auth-header p {
  color: rgba(255,255,255,.75);
  margin: 0;
  font-size: 13px;
}

.auth-body {
  padding: 28px 32px 32px;
  background: var(--surface);
}

/* ===============================
   CARDS
   =============================== */

.form-card,
.card {
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  box-shadow: var(--shadow);
  transition: background var(--transition), box-shadow var(--transition);
}

.form-card {
  max-width: 700px;
  margin: 40px auto;
}

/* ===============================
   FORMS
   =============================== */

.form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form label {
  display: block;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-muted);
  margin-bottom: 5px;
  transition: color var(--transition);
}

.form input,
.form select {
  width: 100%;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-size: 15px;
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition),
              background var(--transition);
  appearance: none;
}

.form input::placeholder { color: var(--text-muted); opacity: 0.6; }

.form input:hover,
.form select:hover {
  border-color: #aac0aa;
}

.form input:focus,
.form select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(46,125,50,.15);
}

.form input:focus-visible,
.form select:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 20px;
}

.row {
  display: flex;
  gap: 10px;
}

.form .btn {
  width: 100%;
  margin-top: 6px;
}

/* ===============================
   ROLE BOXES (registration)
   =============================== */

.role-box {
  margin-top: 4px;
  padding: 20px;
  background: var(--primary-light);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary);
  transition: background var(--transition);
}

.role-box h3 {
  margin-top: 0;
  color: var(--primary-dark);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.note {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 10px;
  transition: color var(--transition);
}

/* ===============================
   BUTTONS
   =============================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition),
              transform 0.12s ease, opacity var(--transition);
  text-decoration: none;
  text-align: center;
  line-height: 1.4;
  white-space: nowrap;
  letter-spacing: 0.2px;
}

.btn:active:not(:disabled):not(.disabled) {
  transform: scale(0.97);
}

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  box-shadow: 0 2px 8px rgba(46,125,50,.30);
}

.btn.primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #33903a, var(--primary));
  box-shadow: 0 4px 14px rgba(46,125,50,.40);
  transform: translateY(-1px);
}

.btn.secondary {
  background: var(--secondary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn.secondary:hover:not(:disabled) {
  background: var(--secondary-dark);
  transform: translateY(-1px);
}

.btn.success {
  background: linear-gradient(135deg, var(--success), var(--success-dark));
  color: white;
  box-shadow: 0 2px 8px rgba(39,174,96,.28);
}

.btn.success:hover:not(:disabled) {
  box-shadow: 0 4px 14px rgba(39,174,96,.38);
  transform: translateY(-1px);
}

.btn.danger {
  background: linear-gradient(135deg, var(--danger), var(--danger-dark));
  color: white;
  box-shadow: 0 2px 8px rgba(229,62,62,.25);
}

.btn.danger:hover:not(:disabled) {
  box-shadow: 0 4px 14px rgba(229,62,62,.35);
  transform: translateY(-1px);
}

.btn.warning {
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: white;
  box-shadow: 0 2px 8px rgba(201,162,39,.28);
}

.btn.warning:hover:not(:disabled) {
  box-shadow: 0 4px 14px rgba(201,162,39,.38);
  transform: translateY(-1px);
}

.btn.disabled,
.btn:disabled {
  background: #c4c9c4 !important;
  box-shadow: none !important;
  cursor: not-allowed;
  opacity: 0.65;
  transform: none !important;
}

.btn.small {
  padding: 5px 12px;
  font-size: 12px;
  border-radius: 6px;
}

/* ===============================
   ALERTS
   =============================== */

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  font-size: 14px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-weight: 500;
}

.alert.error   { background: #fef2f2; color: #991b1b; border-left: 4px solid var(--danger); }
.alert.success { background: #f0fdf4; color: #14532d; border-left: 4px solid var(--success); }
.alert.warning { background: #fffbeb; color: #78350f; border-left: 4px solid var(--gold); }
.alert.info    { background: var(--primary-light); color: var(--primary-dark); border-left: 4px solid var(--primary); }

/* ===============================
   TEACHER GRID & CARDS
   =============================== */

.teacher-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 18px;
}

.teacher-card {
  background: var(--surface);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow);
  transition: background var(--transition), box-shadow var(--transition),
              transform var(--transition);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.teacher-card-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  padding: 24px 16px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.teacher-card-body {
  padding: 14px 18px 18px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.teacher-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.teacher-card h3 {
  margin: 0 0 4px;
  font-size: 15px;
  color: var(--text);
}

.teacher-card a.btn {
  margin-top: auto;
}

/* ===============================
   TABLES
   =============================== */

.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-md);
  -webkit-overflow-scrolling: touch;
}

.table {
  width: 100%;
  background: var(--surface);
  border-radius: var(--radius-md);
  border-collapse: collapse;
  overflow: hidden;
  transition: background var(--transition);
  font-size: 14px;
}

.table thead th {
  background: var(--primary);
  color: white;
  font-weight: 600;
  padding: 13px 14px;
  text-align: center;
  letter-spacing: 0.2px;
  font-size: 13px;
  text-transform: uppercase;
  white-space: nowrap;
}

.table thead th:first-child { border-radius: var(--radius-md) 0 0 0; }
.table thead th:last-child  { border-radius: 0 var(--radius-md) 0 0; }

.table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: center;
  transition: background var(--transition), border-color var(--transition);
  vertical-align: middle;
}

.table tbody tr:last-child td { border-bottom: none; }

.table tbody tr:nth-child(even) td { background: rgba(46,125,50,.03); }

.table tbody tr:hover td { background: rgba(46,125,50,.07); }

/* ===============================
   CALENDAR
   =============================== */

.calendar-wrapper {
  overflow-x: auto;
  margin-top: 25px;
}

.calendar {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: background var(--transition);
  min-width: 480px;
}

.calendar th {
  background: var(--primary);
  color: white;
  padding: 12px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.calendar td {
  padding: 12px;
  text-align: center;
  border: 1px solid var(--border);
  font-size: 14px;
  transition: background var(--transition), color var(--transition);
}

.calendar .time-col {
  background: var(--table-head);
  font-weight: 700;
  font-size: 13px;
  color: var(--text-muted);
}

.calendar td.available {
  background: #f0fdf4;
  color: var(--success-dark);
  cursor: pointer;
  font-weight: 600;
}

.calendar td.available:hover { background: #dcfce7; }
.calendar td.booked { background: #fef2f2; color: var(--danger-dark); }

/* ===============================
   BADGES
   =============================== */

.badge {
  display: inline-block;
  padding: 3px 11px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.badge.success { background: #dcfce7; color: #14532d; }
.badge.danger  { background: #fee2e2; color: #991b1b; }
.badge.warning { background: #fef9c3; color: #713f12; }
.badge.info    { background: #e8f5e9; color: #1b5e20; }

/* ===============================
   FLASH BANNER
   =============================== */

.flash {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 22px;
  font-size: 14px;
  font-weight: 500;
  max-height: 80px;
  overflow: hidden;
}

.flash-success { background: #f0fdf4; color: #14532d; border-bottom: 3px solid var(--success); }
.flash-error   { background: #fef2f2; color: #991b1b; border-bottom: 3px solid var(--danger); }
.flash-warning { background: #fffbeb; color: #78350f; border-bottom: 3px solid var(--gold); }
.flash-info    { background: var(--primary-light); color: var(--primary-dark); border-bottom: 3px solid var(--primary); }

.flash-close {
  background: none;
  border: none;
  font-size: 16px;
  cursor: pointer;
  opacity: 0.5;
  line-height: 1;
  padding: 2px 6px;
  color: inherit;
  flex-shrink: 0;
  border-radius: 4px;
  transition: opacity var(--transition), background var(--transition);
}

.flash-close:hover { opacity: 1; background: rgba(0,0,0,.08); }

/* ===============================
   STAT CARDS (admin)
   =============================== */

.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 22px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--primary);
  transition: background var(--transition), transform var(--transition);
}

.stat-card:hover { transform: translateY(-2px); }
.stat-card--success { border-top-color: var(--success); }
.stat-card--warning { border-top-color: var(--gold); }
.stat-card--danger  { border-top-color: var(--danger); }

.stat-number {
  font-size: 38px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 6px;
  color: var(--text);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ===============================
   TEACHER AVATAR
   =============================== */

.teacher-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(255,255,255,.18);
  border: 2px solid rgba(255,255,255,.35);
  color: white;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 4px;
  letter-spacing: 0.5px;
}

.active-filter {
  background: var(--primary) !important;
  color: white !important;
  box-shadow: 0 2px 8px rgba(46,125,50,.30);
}

/* ===============================
   BTN-LINK (logout)
   =============================== */

.btn-link {
  background: none;
  border: none;
  color: rgba(255,255,255,.85);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  padding: 6px 10px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.btn-link:hover { background: rgba(255,255,255,.1); color: white; }

/* ===============================
   LINKS
   =============================== */

.link { color: var(--primary); text-decoration: none; font-weight: 500; }
.link:hover { text-decoration: underline; opacity: 1; }
.link:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 2px; }

/* ===============================
   SLOT LIST VIEW
   =============================== */

.slot-table { display: flex; flex-direction: column; gap: 12px; }

.slot-row {
  background: var(--surface);
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition);
}

/* ===============================
   PAGE HEADERS
   =============================== */

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border);
}

.page-header h1 { margin: 0 0 4px; }

.page-header p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
}

.section-title {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin: 0 0 14px;
}

/* ===============================
   EMPTY STATES
   =============================== */

.empty-state {
  text-align: center;
  padding: 52px 24px;
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 12px;
  display: block;
  opacity: 0.6;
}

.empty-state h3 {
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--text);
}

.empty-state p {
  color: var(--text-muted);
  margin: 0;
  font-size: 14px;
}

/* ===============================
   DARK MODE
   =============================== */

body.dark {
  background: var(--bg-dark);
  color: var(--text-dark);
}

body.dark h1, body.dark h2, body.dark h3 { color: var(--text-dark); }

body.dark .navbar { background: var(--nav-bg-dark); }

body.dark .nav-right a { color: rgba(255,255,255,.75); }

body.dark .card,
body.dark .form-card,
body.dark .teacher-card,
body.dark .slot-row,
body.dark .table,
body.dark .calendar {
  background: var(--surface-dark);
  color: var(--text-dark);
  box-shadow: 0 2px 10px rgba(0,0,0,.3);
}

body.dark .teacher-card h3 { color: var(--text-dark); }

body.dark .auth-body { background: var(--surface-dark); }

body.dark .role-box {
  background: rgba(46,125,50,.12);
  border-left-color: var(--primary);
}

body.dark .role-box h3 { color: #7ec886; }

body.dark .form input,
body.dark .form select {
  background: var(--input-bg-dark);
  color: var(--text-dark);
  border-color: var(--border-dark);
}

body.dark .form input::placeholder { color: #688068; }

body.dark .form input:hover,
body.dark .form select:hover { border-color: #4a6e4a; }

body.dark .form input:focus,
body.dark .form select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(46,125,50,.2);
}

body.dark .form label { color: var(--text-muted-dark); }

body.dark .note { color: var(--text-muted-dark); }

body.dark .table thead th { background: #1a3320; }

body.dark .table td {
  border-color: #2d3e2d;
  color: var(--text-dark);
}

body.dark .table tbody tr:nth-child(even) td { background: rgba(46,125,50,.05); }
body.dark .table tbody tr:hover td { background: rgba(46,125,50,.10); }

body.dark .calendar th { background: #1a3320; }

body.dark .calendar td {
  background: #222d22;
  color: var(--text-dark);
  border-color: #2d3e2d;
}

body.dark .calendar .time-col { background: #1a2a1a; color: #8aaa8a; }
body.dark .calendar td.available { background: #1a3320; color: #7ec886; }
body.dark .calendar td.available:hover { background: #1e3d22; }
body.dark .calendar td.booked { background: #3d1a1a; color: #f87171; }

body.dark .link { color: #6ec97a; }

body.dark .stat-card { background: var(--surface-dark); }
body.dark .stat-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,.4); }
body.dark .stat-number { color: var(--text-dark); }
body.dark .stat-label { color: var(--text-muted-dark); }

body.dark .flash-success { background: #0f2d18; color: #86efac; }
body.dark .flash-error   { background: #2d0f0f; color: #fca5a5; }
body.dark .flash-warning { background: #2d2200; color: #fcd34d; }
body.dark .flash-info    { background: #0f2d18; color: #86efac; }

body.dark .btn-link { color: rgba(255,255,255,.75); }

body.dark .alert.error   { background: #2d0f0f; color: #fca5a5; }
body.dark .alert.success { background: #0f2d18; color: #86efac; }
body.dark .alert.warning { background: #2d2200; color: #fcd34d; }
body.dark .alert.info    { background: #0f2d18; color: #86efac; }

body.dark .badge.success { background: #14532d; color: #bbf7d0; }
body.dark .badge.danger  { background: #7f1d1d; color: #fecaca; }
body.dark .badge.warning { background: #451a03; color: #fde68a; }
body.dark .badge.info    { background: #14532d; color: #bbf7d0; }

body.dark .teacher-card:hover { box-shadow: 0 6px 20px rgba(0,0,0,.5); }

body.dark .page-header { border-bottom-color: var(--border-dark); }

body.dark .calendar-wrapper,
body.dark .table-wrapper { border-color: var(--border-dark); }

body.dark .section-title { color: var(--text-muted-dark); }

/* ===============================
   RESPONSIVE
   =============================== */

@media (max-width: 700px) {
  .navbar {
    flex-wrap: wrap;
    padding: 10px 16px;
    min-height: unset;
    gap: 8px;
  }

  .nav-right {
    width: 100%;
    gap: 4px;
    padding-bottom: 6px;
  }

  .page { padding: 16px; }
  .form-grid { grid-template-columns: 1fr; }
  .row { flex-direction: column; }
  .slot-row { grid-template-columns: 1fr; }

  .calendar td, .calendar th { padding: 8px; font-size: 12px; }

  .teacher-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }

  .form-card { margin: 16px auto; padding: 18px; }

  .stats-row { grid-template-columns: 1fr 1fr; gap: 12px; }

  .auth-card { margin: 16px auto; border-radius: var(--radius-md); }
  .auth-header { padding: 28px 24px 22px; }
  .auth-body { padding: 22px 24px 28px; }
  .auth-logo { font-size: 40px; }

  .table th, .table td { padding: 10px 10px; font-size: 13px; }

  .page-header { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .brand { font-size: 17px; }

  .btn { font-size: 14px; padding: 9px 16px; }

  .stats-row { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-number { font-size: 30px; }

  .teacher-grid { grid-template-columns: 1fr 1fr; }
}