/* ══════════════════════════════════════════════════════════════
   Modern School UI — 2026
   ══════════════════════════════════════════════════════════════ */

/* ── Google Font + Variables ──────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;500;600;700;800&display=swap');

:root {
  --primary:       #4f46e5;
  --primary-light: #818cf8;
  --primary-dark:  #3730a3;
  --secondary:     #06b6d4;
  --accent:        #f59e0b;
  --success:       #10b981;
  --danger:        #ef4444;
  --warning:       #f59e0b;
  --info:          #3b82f6;

  --sidebar-bg:    #0f172a;
  --sidebar-w:     260px;

  --bg-body:       #f0f4ff;
  --bg-card:       #ffffff;
  --text-main:     #1e293b;
  --text-muted:    #64748b;
  --border:        #e2e8f0;

  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   20px;
  --radius-xl:   28px;

  --shadow-sm:  0 2px 8px rgba(79,70,229,.08);
  --shadow-md:  0 8px 24px rgba(79,70,229,.12);
  --shadow-lg:  0 16px 48px rgba(79,70,229,.18);

  --transition: .22s cubic-bezier(.4,0,.2,1);
}

/* ── Reset / Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Sarabun', sans-serif;
  font-size: 15px;
  color: var(--text-main);
  background: var(--bg-body);
  margin: 0;
}

/* ── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #c7d2fe; border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-light); }

/* ══════════════════════════════════════════════════════════
   LOGIN
   ══════════════════════════════════════════════════════════ */
.login-body {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99,102,241,.35) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 20%, rgba(6,182,212,.3) 0%, transparent 55%),
    linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  padding: 1rem;
}
.login-card {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2.75rem;
  width: 100%; max-width: 440px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,.15);
}
.login-logo { width: 80px; height: 80px; object-fit: contain; }
.login-divider { border-color: var(--border); opacity: 1; }

.login-card .form-control {
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  padding: .6rem 1rem;
  font-size: .95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.login-card .form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,.15);
}
.login-card .btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  border-radius: var(--radius-sm);
  padding: .65rem 1.5rem;
  font-weight: 700;
  letter-spacing: .02em;
  box-shadow: 0 4px 14px rgba(79,70,229,.4);
  transition: all var(--transition);
}
.login-card .btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79,70,229,.5);
}

/* ══════════════════════════════════════════════════════════
   SIDEBAR
   ══════════════════════════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: var(--sidebar-bg);
  position: fixed; top: 0; left: 0;
  display: flex; flex-direction: column;
  z-index: 200;
  transition: transform var(--transition);
  box-shadow: 4px 0 24px rgba(0,0,0,.3);
  overflow: hidden;
}

/* subtle gradient strip on left edge */
.sidebar::before {
  content: '';
  position: absolute; top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
}

.sidebar-brand {
  padding: 1.2rem 1.4rem;
  border-bottom: 1px solid rgba(255,255,255,.06);
  display: flex; align-items: center; gap: .65rem;
}
.sidebar-brand img { border-radius: var(--radius-sm); }
.sidebar-brand .brand-name {
  font-size: .9rem; font-weight: 700;
  color: #fff; line-height: 1.2;
}
.sidebar-brand .brand-sub {
  font-size: .72rem; color: rgba(255,255,255,.45);
}

.sidebar-section-label {
  padding: 1rem 1.4rem .3rem;
  font-size: .68rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase;
  color: rgba(255,255,255,.3);
}

.sidebar-nav { padding: .5rem 0; flex: 1; overflow-y: auto; }
.sidebar-nav a {
  display: flex; align-items: center; gap: .75rem;
  padding: .65rem 1.4rem;
  color: rgba(255,255,255,.6);
  text-decoration: none;
  font-size: .9rem; font-weight: 500;
  border-radius: 0;
  margin: 1px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition), transform var(--transition);
  position: relative;
}
.sidebar-nav a:hover {
  background: rgba(255,255,255,.07);
  color: #fff;
  transform: translateX(2px);
}
.sidebar-nav a.active {
  background: linear-gradient(135deg, rgba(79,70,229,.5) 0%, rgba(79,70,229,.25) 100%);
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(129,140,248,.3);
}
.sidebar-nav a.active::before {
  content: '';
  position: absolute; left: -8px; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 60%;
  background: var(--primary-light);
  border-radius: 99px;
}
.nav-icon { font-size: 1.05rem; width: 20px; text-align: center; flex-shrink: 0; opacity: .85; }

.sidebar-footer {
  border-top: 1px solid rgba(255,255,255,.06);
  padding: .5rem 0;
}
.sidebar-user {
  display: flex; align-items: center; gap: .65rem;
  padding: .8rem 1.4rem;
  color: rgba(255,255,255,.7);
  font-size: .85rem;
}
.sidebar-user .avatar-circle {
  width: 34px; height: 34px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0;
}

/* ══════════════════════════════════════════════════════════
   MAIN CONTENT
   ══════════════════════════════════════════════════════════ */
.main-content {
  margin-left: var(--sidebar-w);
  padding: 1.75rem 1.5rem;
  min-height: 100vh;
  background: var(--bg-body);
}
.main-footer {
  margin-left: var(--sidebar-w);
  padding: .75rem 1.5rem;
  font-size: .8rem;
  color: var(--text-muted);
  background: var(--bg-body);
  border-top: 1px solid var(--border);
}

/* ── Page heading bar ─────────────────────────────────────── */
.page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1.5rem;
  flex-wrap: wrap; gap: .75rem;
}
.page-header h4, .page-header h5 {
  margin: 0; font-weight: 700; color: var(--text-main);
}

/* ══════════════════════════════════════════════════════════
   CARDS
   ══════════════════════════════════════════════════════════ */
.card {
  border: none;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}
.card-header {
  background: transparent;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  padding: .9rem 1.25rem;
}

/* ── Stat card ────────────────────────────────────────────── */
.stat-card {
  border-radius: var(--radius-md);
  border: none;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
  position: relative;
}
.stat-card::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
  opacity: 0;
  transition: opacity var(--transition);
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.stat-card:hover::after { opacity: 1; }

.stat-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.45rem;
}
.stat-value { font-size: 1.9rem; font-weight: 800; line-height: 1; }
.stat-label { font-size: .8rem; color: var(--text-muted); font-weight: 500; }

/* gradient stat variants */
.stat-card.gradient-blue  { background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%); color: #fff; }
.stat-card.gradient-green { background: linear-gradient(135deg, #059669 0%, #34d399 100%); color: #fff; }
.stat-card.gradient-amber { background: linear-gradient(135deg, #d97706 0%, #fbbf24 100%); color: #fff; }
.stat-card.gradient-rose  { background: linear-gradient(135deg, #e11d48 0%, #fb923c 100%); color: #fff; }
.stat-card.gradient-purple{ background: linear-gradient(135deg, #7c3aed 0%, #a78bfa 100%); color: #fff; }

/* ── Glass card ───────────────────────────────────────────── */
.glass-card {
  background: rgba(255,255,255,.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.8);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

/* ══════════════════════════════════════════════════════════
   TABLES
   ══════════════════════════════════════════════════════════ */
.table {
  border-collapse: separate;
  border-spacing: 0;
}
.table thead th {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border: none;
  font-weight: 600;
  font-size: .85rem;
  letter-spacing: .03em;
  padding: .85rem 1rem;
  white-space: nowrap;
}
.table thead th:first-child { border-radius: var(--radius-sm) 0 0 0; }
.table thead th:last-child  { border-radius: 0 var(--radius-sm) 0 0; }
.table tbody tr {
  transition: background var(--transition);
}
.table-hover tbody tr:hover { background: #eef2ff; }
.table tbody td {
  border-bottom: 1px solid #f1f5f9;
  padding: .75rem 1rem;
  vertical-align: middle;
}
.table tbody tr:last-child td { border-bottom: none; }

/* ══════════════════════════════════════════════════════════
   BUTTONS
   ══════════════════════════════════════════════════════════ */
.btn {
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .88rem;
  padding: .45rem 1.1rem;
  transition: all var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  box-shadow: 0 3px 10px rgba(79,70,229,.35);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 5px 16px rgba(79,70,229,.45);
  background: linear-gradient(135deg, #5b52f5 0%, var(--primary) 100%);
}
.btn-outline-primary {
  border-color: var(--primary); color: var(--primary);
}
.btn-outline-primary:hover {
  background: var(--primary); border-color: var(--primary);
}
.btn-success {
  background: linear-gradient(135deg, #059669 0%, #10b981 100%);
  border: none; box-shadow: 0 3px 10px rgba(16,185,129,.3);
}
.btn-sm { font-size: .8rem; padding: .3rem .75rem; }
.btn-xs { font-size: .75rem; padding: .2rem .55rem; }

/* icon buttons */
.btn-icon {
  width: 34px; height: 34px; padding: 0;
  border-radius: var(--radius-sm);
  display: inline-flex; align-items: center; justify-content: center;
}

/* ══════════════════════════════════════════════════════════
   FORMS
   ══════════════════════════════════════════════════════════ */
.form-control, .form-select {
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-size: .9rem;
  padding: .5rem .9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-control:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,.12);
  outline: none;
}
.form-label {
  font-weight: 600; font-size: .85rem; color: var(--text-main);
  margin-bottom: .35rem;
}
.input-group-text {
  border: 1.5px solid var(--border);
  background: #f8fafc;
  color: var(--text-muted);
}

/* ══════════════════════════════════════════════════════════
   BADGES & PILLS
   ══════════════════════════════════════════════════════════ */
.badge { font-weight: 600; border-radius: 99px; }

.badge-pending  { background:#fef9c3; color:#854d0e; padding:4px 12px; border-radius:99px; font-size:.78rem; font-weight:600; }
.badge-approved { background:#dcfce7; color:#166534; padding:4px 12px; border-radius:99px; font-size:.78rem; font-weight:600; }
.badge-rejected { background:#fee2e2; color:#991b1b; padding:4px 12px; border-radius:99px; font-size:.78rem; font-weight:600; }
.badge-graded   { background:#dbeafe; color:#1e40af; padding:4px 12px; border-radius:99px; font-size:.78rem; font-weight:600; }
.badge-revision { background:#fce7f3; color:#9d174d; padding:4px 12px; border-radius:99px; font-size:.78rem; font-weight:600; }

/* ══════════════════════════════════════════════════════════
   MODALS
   ══════════════════════════════════════════════════════════ */
.modal-content {
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.modal-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-bottom: none;
  padding: 1rem 1.5rem;
}
.modal-header .btn-close { filter: invert(1) brightness(2); }
.modal-title { font-weight: 700; font-size: 1rem; }
.modal-body { padding: 1.5rem; }
.modal-footer {
  border-top: 1px solid var(--border);
  padding: .85rem 1.5rem;
  background: #fafafa;
}

/* ══════════════════════════════════════════════════════════
   ALERTS
   ══════════════════════════════════════════════════════════ */
.alert {
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  padding: .85rem 1.25rem;
}
.alert-success {
  background: #f0fdf4;
  color: #166534;
  border-left: 4px solid #22c55e;
}
.alert-danger {
  background: #fef2f2;
  color: #991b1b;
  border-left: 4px solid #ef4444;
}
.alert-warning {
  background: #fffbeb;
  color: #92400e;
  border-left: 4px solid #f59e0b;
}
.alert-info {
  background: #eff6ff;
  color: #1e40af;
  border-left: 4px solid #3b82f6;
}

/* ══════════════════════════════════════════════════════════
   PROGRESS
   ══════════════════════════════════════════════════════════ */
.progress {
  height: 8px;
  border-radius: 99px;
  background: #f1f5f9;
  overflow: hidden;
}
.progress-bar {
  border-radius: 99px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

/* ══════════════════════════════════════════════════════════
   ATTENDANCE GRID
   ══════════════════════════════════════════════════════════ */
.attendance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  gap: .9rem;
}
.student-card {
  border-radius: var(--radius-md);
  padding: 1rem .75rem;
  text-align: center;
  cursor: pointer;
  border: 2px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition),
              border-color var(--transition), background var(--transition);
  user-select: none;
  position: relative;
  overflow: hidden;
}
.student-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  opacity: 0;
  transition: opacity var(--transition);
}
.student-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.student-card.status-present { border-color: #10b981; background: #f0fdf4; }
.student-card.status-present::before { background: #10b981; opacity: 1; }
.student-card.status-absent  { border-color: #ef4444; background: #fef2f2; }
.student-card.status-absent::before  { background: #ef4444; opacity: 1; }
.student-card.status-late    { border-color: #f59e0b; background: #fffbeb; }
.student-card.status-late::before    { background: #f59e0b; opacity: 1; }
.student-card.status-leave   { border-color: #6366f1; background: #eef2ff; }
.student-card.status-leave::before   { background: #6366f1; opacity: 1; }
.student-card.status-sick    { border-color: #06b6d4; background: #ecfeff; }
.student-card.status-sick::before    { background: #06b6d4; opacity: 1; }
.student-avatar-icon { font-size: 2.6rem; line-height: 1; }
.student-name { font-size: .8rem; font-weight: 600; margin-top: .4rem; line-height: 1.3; }
.student-seat { font-size: .7rem; color: var(--text-muted); }

/* ══════════════════════════════════════════════════════════
   CLASSROOM CARDS (admin/classrooms.php)
   ══════════════════════════════════════════════════════════ */
.room-card {
  border-radius: var(--radius-md);
  border: none;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  overflow: hidden;
  position: relative;
}
.room-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.room-card .room-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  padding: .85rem 1rem;
  color: #fff;
}
.room-card .room-header h5 { font-weight: 800; margin: 0; font-size: 1.05rem; }

/* ══════════════════════════════════════════════════════════
   DEADLINE COLORS
   ══════════════════════════════════════════════════════════ */
.deadline-overdue { color: #dc2626; font-weight: 700; }
.deadline-urgent  { color: #ea580c; font-weight: 600; }
.deadline-soon    { color: #ca8a04; font-weight: 500; }
.deadline-normal  { color: var(--text-muted); }

/* ══════════════════════════════════════════════════════════
   NOTIFICATION DOT
   ══════════════════════════════════════════════════════════ */
.notif-dot {
  position: absolute; top: -5px; right: -5px;
  background: var(--danger); color: #fff;
  border-radius: 50%; width: 18px; height: 18px;
  font-size: .62rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  border: 2px solid var(--bg-card);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%,100% { box-shadow: 0 0 0 0 rgba(239,68,68,.4); }
  50%      { box-shadow: 0 0 0 6px rgba(239,68,68,0); }
}

/* ══════════════════════════════════════════════════════════
   AVATAR BUILDER
   ══════════════════════════════════════════════════════════ */
.avatar-preview-box {
  width: 180px; height: 180px;
  border-radius: 50%;
  border: 3px solid var(--primary-light);
  overflow: hidden;
  margin: 0 auto;
  background: linear-gradient(135deg, #eef2ff 0%, #e0f2fe 100%);
  box-shadow: 0 0 0 6px rgba(79,70,229,.1);
  font-size: 5rem;
  display: flex; align-items: center; justify-content: center;
}
.avatar-option {
  cursor: pointer; padding: 5px; border-radius: var(--radius-sm);
  border: 2px solid transparent; text-align: center;
  font-size: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}
.avatar-option.selected { border-color: var(--primary); background: #eef2ff; }
.avatar-option:hover    { border-color: var(--primary-light); transform: scale(1.1); }

/* ══════════════════════════════════════════════════════════
   SHOWCASE CARD
   ══════════════════════════════════════════════════════════ */
.showcase-card {
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: none;
  transition: transform var(--transition), box-shadow var(--transition);
}
.showcase-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}
.showcase-card .card-img-overlay {
  background: linear-gradient(to top, rgba(15,23,42,.8) 0%, transparent 60%);
}

/* ══════════════════════════════════════════════════════════
   LEADERBOARD / RANKING
   ══════════════════════════════════════════════════════════ */
.rank-row {
  display: flex; align-items: center; gap: .75rem;
  padding: .6rem .9rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.rank-row:hover { background: #f1f5f9; }
.rank-badge {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem; font-weight: 800; flex-shrink: 0;
}
.rank-badge.gold   { background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%); color: #fff; }
.rank-badge.silver { background: linear-gradient(135deg, #94a3b8 0%, #cbd5e1 100%); color: #fff; }
.rank-badge.bronze { background: linear-gradient(135deg, #b45309 0%, #d97706 100%); color: #fff; }
.rank-badge.other  { background: #f1f5f9; color: var(--text-muted); }

/* teacher hero section */
.teacher-hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #312e81 50%, #1e1b4b 100%);
  border-radius: var(--radius-lg);
  padding: 2rem;
  color: #fff;
  position: relative;
  overflow: hidden;
  margin-bottom: 1.75rem;
}
.teacher-hero::before {
  content: '';
  position: absolute; top: -40%; right: -10%;
  width: 350px; height: 350px; border-radius: 50%;
  background: radial-gradient(circle, rgba(129,140,248,.25) 0%, transparent 70%);
  pointer-events: none;
}
.teacher-hero::after {
  content: '';
  position: absolute; bottom: -30%; left: 5%;
  width: 250px; height: 250px; border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,.2) 0%, transparent 70%);
  pointer-events: none;
}
.teacher-avatar-big {
  width: 90px; height: 90px; border-radius: 50%;
  background: rgba(255,255,255,.12);
  border: 3px solid rgba(255,255,255,.25);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; flex-shrink: 0;
}
.badge-chip {
  display: inline-flex; align-items: center; gap: .3rem;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 99px;
  padding: 3px 10px;
  font-size: .78rem; font-weight: 600;
  backdrop-filter: blur(4px);
}

/* ══════════════════════════════════════════════════════════
   DROPDOWN
   ══════════════════════════════════════════════════════════ */
.dropdown-menu {
  border: none;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: .35rem;
  font-size: .88rem;
}
.dropdown-item {
  border-radius: var(--radius-sm);
  padding: .5rem .85rem;
  font-weight: 500;
  transition: background var(--transition);
}
.dropdown-item:hover { background: #eef2ff; color: var(--primary); }
.dropdown-item.text-danger:hover { background: #fef2f2; color: var(--danger); }

/* ══════════════════════════════════════════════════════════
   BREADCRUMB
   ══════════════════════════════════════════════════════════ */
.breadcrumb {
  background: none; padding: 0; margin-bottom: .75rem;
  font-size: .82rem;
}
.breadcrumb-item + .breadcrumb-item::before { color: var(--text-muted); }
.breadcrumb-item a { color: var(--primary); text-decoration: none; }
.breadcrumb-item.active { color: var(--text-muted); }

/* ══════════════════════════════════════════════════════════
   MISC HELPERS
   ══════════════════════════════════════════════════════════ */
.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.divider-gradient {
  border: none; height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--primary) 40%, var(--secondary) 100%);
  opacity: .25; margin: 1rem 0;
}

.empty-state {
  text-align: center; padding: 3rem 1rem;
  color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 3.5rem; margin-bottom: .75rem; opacity: .5; }
.empty-state p { font-size: .95rem; }

/* fade-in animation */
@keyframes fadeInUp {
  from { opacity:0; transform: translateY(12px); }
  to   { opacity:1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp .35s ease forwards; }

/* auto-dismiss alert */
.alert-auto-dismiss { animation: fadeInUp .3s ease; }

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════ */
@media (max-width: 991px) {
  .attendance-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
}

@media (max-width: 767px) {
  .sidebar {
    transform: translateX(-100%);
    width: 240px;
  }
  .sidebar.show { transform: translateX(0); }
  .main-content { margin-left: 0; padding: 1rem; }
  .main-footer  { margin-left: 0; }
  .stat-value   { font-size: 1.5rem; }
  .teacher-hero { padding: 1.25rem; }
  .teacher-avatar-big { width: 68px; height: 68px; font-size: 2.2rem; }

  /* mobile overlay */
  .sidebar-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.5); z-index: 199;
  }
  .sidebar-overlay.show { display: block; }
}

@media (max-width: 576px) {
  .attendance-grid { grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); gap: .6rem; }
  .student-avatar-icon { font-size: 2rem; }
}

/* ══════════════════════════════════════════════════════════
   PRINT
   ══════════════════════════════════════════════════════════ */
@media print {
  .sidebar, .main-footer, .btn, .alert, .modal { display: none !important; }
  .main-content { margin: 0 !important; padding: 0 !important; }
}