/* frontend/css/main.css */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,400&display=swap');

:root {
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --primary-800: #1e40af;
  --primary-900: #1e3a8a;
  
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #06b6d4;

  --blue-soft: #e8f0fe;
  --blue-mid: #4285f4;

  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  --shadow-xs: 0 1px 2px rgba(0,0,0,.04);
  --shadow-sm: 0 2px 8px rgba(0,0,0,.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.10);
  --shadow-xl: 0 16px 50px rgba(0,0,0,.12);
  --shadow-blue: 0 4px 20px rgba(37,99,235,.20);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --transition: all .2s ease;
  --transition-slow: all .35s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); color: var(--gray-800); background: var(--gray-50); line-height: 1.6; -webkit-font-smoothing: antialiased; }

/* ===================== TYPOGRAPHY ===================== */
h1,h2,h3,h4,h5,h6 { font-family: var(--font-display); font-weight: 700; line-height: 1.3; color: var(--gray-900); }
h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }
p { color: var(--gray-600); }
a { color: var(--primary-600); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-700); }

/* ===================== LAYOUT ===================== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.page-wrapper { display: flex; min-height: 100vh; }
.main-content { flex: 1; margin-left: 260px; padding: 24px; padding-top: 88px; transition: var(--transition-slow); min-width: 0; overflow-x: hidden; }
@media (max-width: 1024px) { .main-content { margin-left: 0; } }

/* ===================== SIDEBAR ===================== */
.sidebar {
  width: 260px;
  background: white;
  border-right: 1px solid var(--gray-100);
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: var(--transition-slow);
  box-shadow: var(--shadow-sm);
}
.sidebar-logo {
  padding: 20px 20px 12px 20px;
  border-bottom: 1px solid var(--gray-100);
}
.logo-mark {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-400));
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  box-shadow: var(--shadow-blue);
}
.logo-text { font-family: var(--font-display); font-weight: 800; font-size: 1.2rem; color: var(--gray-900); }
.logo-text span { color: var(--primary-600); }

.sidebar-user {
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  gap: 12px;
}
.user-avatar {
  width: 42px; height: 42px;
  border-radius: var(--radius-full);
  object-fit: cover;
  background: linear-gradient(135deg, var(--primary-200), var(--primary-400));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--primary-700);
  font-size: .9rem;
  flex-shrink: 0;
}
.user-info .user-name { font-weight: 600; font-size: .9rem; color: var(--gray-800); }
.user-info .user-role {
  font-size: .72rem;
  color: white;
  background: var(--primary-600);
  padding: 1px 8px;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-top: 2px;
  font-weight: 500;
}

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; min-height: 0; }
.nav-section { margin-bottom: 20px; }
.nav-section-label { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--gray-400); padding: 0 8px; margin-bottom: 6px; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--gray-600);
  font-weight: 500;
  font-size: .88rem;
  transition: var(--transition);
  cursor: pointer;
  margin-bottom: 2px;
}
.nav-item:hover { background: var(--gray-50); color: var(--gray-800); }
.nav-item.active { background: var(--primary-50); color: var(--primary-700); font-weight: 600; }
.nav-item .nav-icon { width: 18px; height: 18px; opacity: .8; flex-shrink: 0; }
.nav-item.active .nav-icon { opacity: 1; }
.nav-badge { margin-left: auto; background: var(--danger); color: white; font-size: .65rem; font-weight: 700; padding: 1px 6px; border-radius: var(--radius-full); }

.sidebar-footer { padding: 16px 12px; border-top: 1px solid var(--gray-100); }
.sidebar-copyright { padding:10px 16px 16px; font-size:.7rem; color:#94a3b8; line-height:1.7; border-top:1px solid var(--gray-100); text-align:left; flex-shrink:0; }

/* ===================== TOPBAR ===================== */
.topbar {
  height: 64px;
  background: white;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 99;
  box-shadow: var(--shadow-xs);
}
.topbar-left { display: flex; align-items: center; gap: 16px; }
.topbar-title { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; color: var(--gray-900); }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.notif-btn {
  position: relative;
  width: 38px; height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  background: white;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--gray-500);
}
.notif-btn:hover { background: var(--gray-50); border-color: var(--gray-300); }
.notif-dot { position: absolute; top: 6px; right: 6px; width: 8px; height: 8px; background: var(--danger); border-radius: 50%; border: 2px solid white; }

/* ===================== CARDS ===================== */
.card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  padding: 24px;
  transition: var(--transition);
  box-shadow: var(--shadow-xs);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.card-title { font-family: var(--font-display); font-weight: 700; font-size: 1rem; color: var(--gray-900); }

/* Stats Cards */
.stat-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  border: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.stat-icon.blue { background: var(--primary-50); }
.stat-icon.green { background: #ecfdf5; }
.stat-icon.orange { background: #fff7ed; }
.stat-icon.purple { background: #faf5ff; }
.stat-value { font-family: var(--font-display); font-size: 1.8rem; font-weight: 800; color: var(--gray-900); line-height: 1; }
.stat-label { font-size: .8rem; color: var(--gray-500); margin-top: 4px; }
.stat-change { font-size: .75rem; font-weight: 600; margin-top: 4px; }
.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* Class Cards */
.class-card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  overflow: hidden;
  transition: var(--transition-slow);
  cursor: pointer;
}
.class-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.class-card-header {
  height: 120px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}
.class-card-body { padding: 16px; }
.class-card-subject {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  display: inline-block;
  margin-bottom: 8px;
}
.class-card-name { font-family: var(--font-display); font-weight: 700; font-size: .95rem; color: var(--gray-900); margin-bottom: 6px; }
.class-card-teacher { font-size: .8rem; color: var(--gray-500); display: flex; align-items: center; gap: 6px; }
.class-card-footer { padding: 12px 16px; border-top: 1px solid var(--gray-100); display: flex; align-items: center; justify-content: space-between; }
.class-card-meta { font-size: .75rem; color: var(--gray-500); display: flex; align-items: center; gap: 4px; }

/* Teacher Card */
.teacher-card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  padding: 24px;
  text-align: center;
  transition: var(--transition-slow);
}
.teacher-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.teacher-avatar {
  width: 80px; height: 80px;
  border-radius: var(--radius-full);
  margin: 0 auto 14px;
  object-fit: cover;
  background: linear-gradient(135deg, var(--primary-200), var(--primary-400));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--primary-700);
  font-size: 1.5rem;
}
.teacher-name { font-family: var(--font-display); font-weight: 700; font-size: .95rem; color: var(--gray-900); margin-bottom: 4px; }
.teacher-subjects { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px; margin: 8px 0; }
.subject-chip {
  font-size: .68rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--primary-50);
  color: var(--primary-700);
}
.teacher-rating { display: flex; align-items: center; justify-content: center; gap: 4px; font-size: .85rem; font-weight: 600; color: var(--gray-700); }
.stars { color: #f59e0b; }

/* ===================== BUTTONS ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .875rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
  white-space: nowrap;
}
.btn-primary { background: var(--primary-600); color: white; box-shadow: var(--shadow-blue); }
.btn-primary:hover { background: var(--primary-700); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37,99,235,.3); color: white;}
.btn-secondary { background: white; color: var(--gray-700); border: 1px solid var(--gray-200); }
.btn-secondary:hover { background: var(--gray-50); border-color: var(--gray-300); }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-ghost { background: transparent; color: var(--primary-600); }
.btn-ghost:hover { background: var(--primary-50); }
.btn-sm { padding: 7px 14px; font-size: .8rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius-lg); }
.btn-block { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* ===================== FORMS ===================== */
.form-group { margin-bottom: 18px; }
.form-label { display: block; font-weight: 600; font-size: .85rem; color: var(--gray-700); margin-bottom: 6px; }
.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: .875rem;
  color: var(--gray-800);
  background: white;
  transition: var(--transition);
  outline: none;
}
.form-control:focus { border-color: var(--primary-400); box-shadow: 0 0 0 3px rgba(59,130,246,.1); }
.form-control::placeholder { color: var(--gray-400); }
select.form-control { cursor: pointer; }
.form-hint { font-size: .76rem; color: var(--gray-500); margin-top: 5px; }
.form-error { font-size: .76rem; color: var(--danger); margin-top: 5px; }

/* ===================== BADGES ===================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: .72rem;
  font-weight: 700;
  gap: 4px;
}
.badge-blue { background: var(--primary-50); color: var(--primary-700); }
.badge-green { background: #ecfdf5; color: #065f46; }
.badge-orange { background: #fff7ed; color: #9a3412; }
.badge-red { background: #fef2f2; color: #991b1b; }
.badge-gray { background: var(--gray-100); color: var(--gray-600); }
.badge-purple { background: #faf5ff; color: #6b21a8; }

/* ===================== TABLES ===================== */
.table-container { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--gray-100); }
table { width: 100%; border-collapse: collapse; }
thead th { background: var(--gray-50); padding: 12px 16px; font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--gray-500); text-align: left; }
tbody td { padding: 14px 16px; font-size: .875rem; border-top: 1px solid var(--gray-50); }
tbody tr:hover { background: var(--gray-50); }
tbody tr:last-child td { border-bottom: none; }

/* ===================== MODAL ===================== */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
  background: white;
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(.97);
  transition: var(--transition-slow);
  box-shadow: var(--shadow-xl);
}
.modal-overlay.active .modal { transform: translateY(0) scale(1); }
.modal-header { padding: 24px 24px 0; display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; }
.modal-close { width: 32px; height: 32px; border-radius: var(--radius-md); border: none; background: var(--gray-100); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; color: var(--gray-600); transition: var(--transition); }
.modal-close:hover { background: var(--gray-200); }
.modal-body { padding: 20px 24px; }
.modal-footer { padding: 0 24px 24px; display: flex; gap: 10px; justify-content: flex-end; }

/* ===================== SCHEDULE GRID ===================== */
.schedule-grid {
  display: grid;
  gap: 12px;
}
.session-card {
  background: white;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-100);
  padding: 16px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
  transition: var(--transition);
  cursor: pointer;
}
.session-card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-200); }
.session-card.live { border-left: 4px solid var(--danger); background: #fff5f5; }
.session-card.today { border-left: 4px solid var(--primary-500); }
.session-time-block { min-width: 70px; text-align: center; }
.session-time { font-family: var(--font-display); font-weight: 700; font-size: .9rem; color: var(--gray-900); }
.session-date-small { font-size: .72rem; color: var(--gray-400); }
.session-divider { width: 1px; background: var(--gray-100); align-self: stretch; }
.session-info { flex: 1; min-width: 0; }
.session-class-name { font-family: var(--font-display); font-weight: 700; font-size: .9rem; color: var(--gray-900); margin-bottom: 4px; }
.session-meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: .78rem; color: var(--gray-500); }
.session-actions { display: flex; gap: 8px; align-items: center; }
.live-badge { background: var(--danger); color: white; font-size: .68rem; font-weight: 700; padding: 2px 8px; border-radius: var(--radius-full); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.7} }

/* ===================== PAYMENT CARDS ===================== */
.package-card {
  background: white;
  border-radius: var(--radius-xl);
  border: 2px solid var(--gray-100);
  padding: 28px;
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
}
.package-card:hover { box-shadow: var(--shadow-xl); border-color: var(--primary-200); transform: translateY(-4px); }
.package-card.featured { border-color: var(--primary-400); }
.package-card.featured::before { content: 'Terpopuler'; position: absolute; top: 12px; right: -28px; background: var(--primary-600); color: white; font-size: .68rem; font-weight: 700; padding: 4px 40px; transform: rotate(40deg); }
.package-price { font-family: var(--font-display); font-size: 2rem; font-weight: 800; color: var(--primary-600); }
.package-price span { font-size: .875rem; font-weight: 400; color: var(--gray-500); }
.package-original-price { font-size: .875rem; color: var(--gray-400); text-decoration: line-through; }
.package-discount { background: #fef3c7; color: #92400e; font-size: .72rem; font-weight: 700; padding: 2px 8px; border-radius: var(--radius-full); margin-left: 8px; }
.package-features { list-style: none; margin: 16px 0; }
.package-features li { display: flex; align-items: center; gap: 8px; font-size: .875rem; color: var(--gray-600); padding: 6px 0; border-bottom: 1px solid var(--gray-50); }
.package-features li::before { content: '✓'; color: var(--success); font-weight: 700; flex-shrink: 0; }

/* ===================== PROGRESS ===================== */
.progress { height: 6px; background: var(--gray-100); border-radius: var(--radius-full); overflow: hidden; }
.progress-bar { height: 100%; border-radius: var(--radius-full); background: linear-gradient(90deg, var(--primary-400), var(--primary-600)); transition: width .5s ease; }

/* ===================== TABS ===================== */
.tabs { display: flex; border-bottom: 2px solid var(--gray-100); margin-bottom: 20px; gap: 4px; }
.tab-btn { padding: 10px 18px; font-weight: 600; font-size: .875rem; color: var(--gray-500); cursor: pointer; border: none; background: none; border-bottom: 2px solid transparent; margin-bottom: -2px; transition: var(--transition); }
.tab-btn:hover { color: var(--gray-700); }
.tab-btn.active { color: var(--primary-600); border-bottom-color: var(--primary-600); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===================== ALERTS ===================== */
.alert { padding: 14px 16px; border-radius: var(--radius-md); font-size: .875rem; margin-bottom: 16px; display: flex; align-items: flex-start; gap: 10px; }
.alert-info { background: var(--primary-50); color: var(--primary-800); border-left: 3px solid var(--primary-400); }
.alert-success { background: #ecfdf5; color: #065f46; border-left: 3px solid var(--success); }
.alert-warning { background: #fff7ed; color: #9a3412; border-left: 3px solid var(--warning); }
.alert-danger { background: #fef2f2; color: #991b1b; border-left: 3px solid var(--danger); }

/* ===================== UTILITIES ===================== */
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); gap: 20px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.items-center { align-items: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-20 { gap: 20px; }
.mt-4 { margin-top: 4px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-20 { margin-top: 20px; }
.mt-24 { margin-top: 24px; }
.mb-4 { margin-bottom: 4px; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mb-20 { margin-bottom: 20px; }
.mb-24 { margin-bottom: 24px; }
.text-sm { font-size: .8rem; }
.text-xs { font-size: .72rem; }
.text-center { text-align: center; }
.text-primary { color: var(--primary-600); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--gray-500); }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.hidden { display: none !important; }

/* ===================== LOADING ===================== */
.spinner { width: 24px; height: 24px; border: 3px solid var(--gray-200); border-top-color: var(--primary-500); border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.skeleton { background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-50) 50%, var(--gray-100) 75%); background-size: 200% 100%; animation: shimmer 1.4s infinite; border-radius: var(--radius-md); }
@keyframes shimmer { 0%{background-position:200% 0} 100%{background-position:-200% 0} }

/* ===================== PAGE LOADER ===================== */
#page-loader { position: fixed; inset: 0; background: white; z-index: 9999; display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 16px; transition: opacity .3s ease; }
#page-loader.hide { opacity: 0; pointer-events: none; }
.loader-logo { font-family: var(--font-display); font-size: 1.8rem; font-weight: 800; color: var(--primary-700); }
.loader-bar { width: 200px; height: 4px; background: var(--gray-100); border-radius: var(--radius-full); overflow: hidden; }
.loader-bar-fill { height: 100%; width: 0; background: linear-gradient(90deg, var(--primary-400), var(--primary-600)); border-radius: var(--radius-full); animation: loading 1.5s ease forwards; }
@keyframes loading { 0%{width:0} 100%{width:100%} }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-xl); }
  .main-content { margin-left: 0; }
}
@media (max-width: 768px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .container { padding: 0 16px; }
  .main-content { padding: 16px; padding-top: 80px; }
  .topbar { padding: 0 16px; }
}
@media (max-width: 480px) {
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

/* ===================== CUSTOM SCROLLBAR ===================== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-200); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--gray-300); }

/* ===================== ZOOM INTEGRATION ===================== */
.zoom-card {
  background: linear-gradient(135deg, #2D8CFF 0%, #0056D2 100%);
  border-radius: var(--radius-lg);
  padding: 20px;
  color: white;
}
.zoom-card .zoom-logo { font-family: var(--font-display); font-weight: 800; font-size: 1.1rem; margin-bottom: 8px; }
.join-zoom-btn {
  background: white;
  color: #0056D2;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: .875rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}
.join-zoom-btn:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,0,0,.2); }

/* ===================== EVALUATION / RAPOR ===================== */
.grade-circle {
  width: 60px; height: 60px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  flex-shrink: 0;
}
.grade-A { background: #ecfdf5; color: #065f46; }
.grade-B { background: var(--primary-50); color: var(--primary-800); }
.grade-C { background: #fff7ed; color: #9a3412; }
.grade-D { background: #fef2f2; color: #991b1b; }

/* ===================== ATTENDANCE ===================== */
.attendance-pill {
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: .76rem;
  font-weight: 700;
}
.att-present { background: #ecfdf5; color: #065f46; }
.att-absent { background: #fef2f2; color: #991b1b; }
.att-late { background: #fff7ed; color: #9a3412; }
.att-excused { background: var(--gray-100); color: var(--gray-600); }

/* ===================== AVATAR INITIAL ===================== */
.avatar-initial {
  background: linear-gradient(135deg, var(--primary-300), var(--primary-600));
  color: white;
  font-family: var(--font-display);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* ===================== BOTTOM NAV MOBILE ===================== */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 64px;
  background: white;
  border-top: 1px solid #e2e8f0;
  z-index: 200;
  padding: 0 8px;
  box-shadow: 0 -4px 20px rgba(0,0,0,.06);
}
.bottom-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  height: 100%;
  max-width: 480px;
  margin: 0 auto;
}
.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex: 1;
  height: 100%;
  text-decoration: none;
  color: #94a3b8;
  transition: all .2s;
  border-radius: 12px;
  padding: 8px 4px;
  cursor: pointer;
  background: none;
  border: none;
}
.bottom-nav-item:hover { color: #2563eb; background: #f8fbff; }
.bottom-nav-item.active { color: #2563eb; }
.bottom-nav-item svg { width: 22px; height: 22px; stroke-width: 2; }
.bottom-nav-label {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: .6rem;
  font-weight: 600;
  line-height: 1;
}
.bottom-nav-dot {
  position: absolute;
  top: 8px; right: calc(50% - 14px);
  width: 7px; height: 7px;
  background: #ef4444;
  border-radius: 50%;
  border: 1.5px solid white;
}

@media(max-width: 1024px) {
  .bottom-nav { display: block; }
  .main-content { padding-bottom: 80px; }
  /* Sidebar disembunyikan via transform bukan display:none
     supaya .sidebar.open bisa men-toggle-nya kembali */
  .sidebar { transform: translateX(-100%); z-index: 150; display: flex !important; }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-xl); }
}

/* Overlay gelap saat sidebar mobile terbuka */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 149;
  background: rgba(0,0,0,.35);
  animation: fadeIn .2s ease;
}
.sidebar-overlay.active { display: block; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }