/* ==========================================================================
   TALABALAR ELEKTRON JURNALI - CSS STYLES
   Mobil qurilmalar va 15 ta darsga to'liq moslashtirilgan zamonaviy dizayn
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --secondary: #475569;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --info: #06b6d4;
  --info-light: #ecfeff;

  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
body.dark-mode {
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --border-color: #334155;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --primary-light: rgba(37, 99, 235, 0.15);
  --success-light: rgba(16, 185, 129, 0.15);
  --warning-light: rgba(245, 158, 11, 0.15);
  --danger-light: rgba(239, 68, 68, 0.15);
  --info-light: rgba(6, 182, 212, 0.15);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}

/* Layout */
.app-container {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* SIDEBAR (Desktop) */
.sidebar {
  width: 260px;
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 40;
}

.sidebar-header {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.sidebar-subtitle {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

.sidebar-close-btn {
  display: none;
  background: transparent;
  border: none;
  font-size: 1.25rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.sidebar-nav {
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.nav-item:hover {
  background: var(--bg-main);
  color: var(--primary);
}

.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  border-color: rgba(37, 99, 235, 0.2);
}

.nav-item i {
  font-size: 1.1rem;
  width: 22px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Sidebar Backdrop (Mobile) */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(3px);
  z-index: 1030;
}

.sidebar-overlay.show {
  display: block;
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-x: hidden;
  position: relative;
}

/* Top Header */
.top-header {
  height: 64px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 30;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.menu-toggle-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--text-main);
  cursor: pointer;
}

.page-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Content Container */
.content-area {
  padding: 24px;
  flex: 1;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.2s ease-in-out;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-info h4 {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.stat-info .stat-value {
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
}

.stat-info .stat-desc {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 3px;
}

.stat-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
}

.stat-icon.blue { background: var(--primary-light); color: var(--primary); }
.stat-icon.green { background: var(--success-light); color: var(--success); }
.stat-icon.amber { background: var(--warning-light); color: var(--warning); }
.stat-icon.purple { background: #faf5ff; color: #9333ea; }

/* Dashboard Grids */
.dashboard-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

@media (max-width: 1024px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 20px;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-body {
  padding: 20px;
}

/* Action Bars / Controls */
.action-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.action-bar-left,
.action-bar-right {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

/* Form Elements */
.form-group {
  margin-bottom: 14px;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 5px;
}

.form-control {
  width: 100%;
  padding: 9px 12px;
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-main);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.search-box {
  position: relative;
  min-width: 220px;
}

.search-box i {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  font-size: 0.85rem;
}

.search-box input {
  padding-left: 34px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-success {
  background: var(--success);
  color: white;
}
.btn-success:hover {
  background: #059669;
}

.btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
}
.btn-outline:hover {
  background: var(--bg-main);
  border-color: var(--text-muted);
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* Scroll Hint Banner (Mobile) */
.mobile-scroll-hint {
  display: none;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px dashed rgba(37, 99, 235, 0.3);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 8px;
  align-items: center;
  gap: 8px;
}

/* =========================================================================
   TABLES & STICKY COLUMNS FOR 15 LESSONS
   ========================================================================= */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  position: relative;
}

.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background: var(--bg-main);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  vertical-align: middle;
  background: var(--bg-card);
}

.data-table tbody tr:hover td {
  background: rgba(37, 99, 235, 0.03);
}

/* Sticky First Column (T/r) */
.data-table th:first-child,
.data-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 12;
  width: 38px;
  min-width: 38px;
  text-align: center;
  background: var(--bg-card);
}
.data-table thead th:first-child {
  background: var(--bg-main);
  z-index: 22;
}

/* Sticky Second Column (Talaba F.I.SH) */
.data-table th:nth-child(2),
.data-table td:nth-child(2) {
  position: sticky;
  left: 38px;
  z-index: 12;
  min-width: 180px;
  max-width: 220px;
  background: var(--bg-card);
  box-shadow: 4px 0 8px -2px rgba(0, 0, 0, 0.08);
}
.data-table thead th:nth-child(2) {
  background: var(--bg-main);
  z-index: 22;
  box-shadow: 4px 0 8px -2px rgba(0, 0, 0, 0.08);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-size: 0.76rem;
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
}

.badge-success { background: var(--success-light); color: var(--success); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-info { background: var(--info-light); color: var(--info); }
.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-neutral { background: var(--bg-main); color: var(--text-muted); border: 1px solid var(--border-color); }

/* Attendance Toggle Controls */
.attendance-toggle-group {
  display: inline-flex;
  background: var(--bg-main);
  padding: 3px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  gap: 3px;
}

.att-btn {
  border: none;
  background: transparent;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.att-btn:hover {
  color: var(--text-main);
}

.att-btn.active-present {
  background: #10b981 !important;
  color: white !important;
  box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.att-btn.active-absent {
  background: #ef4444 !important;
  color: white !important;
  box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

.att-btn.active-excused {
  background: #f59e0b !important;
  color: white !important;
  box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
}

/* Compact matrix markers */
.matrix-cell {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
  margin: 0 auto;
}

.matrix-cell.present { background: var(--success-light); color: var(--success); }
.matrix-cell.absent { background: var(--danger-light); color: var(--danger); }
.matrix-cell.excused { background: var(--warning-light); color: var(--warning); }
.matrix-cell.empty { background: var(--bg-main); color: var(--text-light); }

.matrix-cell:hover {
  transform: scale(1.15);
  box-shadow: var(--shadow-sm);
}

/* Grade Inputs */
.grade-input {
  width: 58px;
  padding: 6px 4px;
  text-align: center;
  font-weight: 700;
  font-size: 0.92rem;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-main);
  transition: var(--transition);
}

.grade-input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--primary-light);
}

.grade-input.grade-5 { border-color: #10b981; color: #059669; font-weight: 800; }
.grade-input.grade-4 { border-color: #3b82f6; color: #2563eb; font-weight: 800; }
.grade-input.grade-3 { border-color: #f59e0b; color: #d97706; font-weight: 800; }
.grade-input.grade-2 { border-color: #ef4444; color: #dc2626; font-weight: 800; }

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  padding: 16px;
}

.modal-backdrop.show {
  opacity: 1;
  visibility: visible;
}

.modal-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 520px;
  overflow: hidden;
  transform: scale(0.95);
  transition: var(--transition);
}

.modal-backdrop.show .modal-card {
  transform: scale(1);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.modal-body {
  padding: 20px;
  max-height: 75vh;
  overflow-y: auto;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  background: var(--bg-main);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 74px;
  right: 16px;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 260px;
  max-width: 360px;
  animation: slideIn 0.3s ease;
  font-size: 0.88rem;
  font-weight: 500;
}

.toast.toast-success { border-left: 4px solid var(--success); }
.toast.toast-danger { border-left: 4px solid var(--danger); }
.toast.toast-info { border-left: 4px solid var(--primary); }
.toast.toast-warning { border-left: 4px solid var(--warning); }

@keyframes slideIn {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* =========================================================================
   LOGIN MODAL & AUTHENTICATION
   ========================================================================= */
.login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeInModal 0.25s ease;
}

@keyframes fadeInModal {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleUpModal {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 420px;
  padding: 32px 28px;
  animation: scaleUpModal 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.login-header {
  text-align: center;
  margin-bottom: 24px;
}

.login-logo {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  color: white;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 14px;
  box-shadow: 0 8px 16px rgba(37, 99, 235, 0.3);
}

.login-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 4px;
}

.login-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.login-alert {
  background: var(--danger-light);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.84rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.input-with-icon {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-icon .input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-light);
  font-size: 0.95rem;
  pointer-events: none;
}

.input-with-icon .form-control {
  padding-left: 40px !important;
  padding-right: 42px !important;
}

.password-toggle-btn {
  position: absolute;
  right: 10px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.password-toggle-btn:hover {
  color: var(--text-main);
}

.login-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  font-size: 0.84rem;
}

.login-remember {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  cursor: pointer;
}

.login-remember input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.btn-lg {
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 600;
}

.login-footer-hint {
  text-align: center;
  margin-top: 20px;
  font-size: 0.82rem;
  color: var(--text-light);
}

.login-footer-hint b {
  color: var(--text-muted);
}

/* Server status badge */
#server-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  cursor: default;
}

/* MOBILE BOTTOM NAVIGATION */
.mobile-bottom-nav {
  display: none;
}

/* =========================================================================
   RESPONSIVE DESIGN FOR SMARTPHONES & TABLETS
   ========================================================================= */
@media (max-width: 768px) {
  /* Sidebar Drawer on Mobile */
  .sidebar {
    position: fixed;
    top: 0;
    left: -290px;
    width: 280px;
    height: 100vh;
    z-index: 1050;
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
  }

  .sidebar.show {
    left: 0;
  }

  .sidebar-close-btn {
    display: block;
  }

  .menu-toggle-btn {
    display: inline-flex;
  }

  /* Content area spacing for bottom navigation bar */
  .content-area {
    padding: 14px 12px 85px 12px;
  }

  .top-header {
    height: 56px;
    padding: 0 14px;
  }

  .page-title {
    font-size: 1.05rem;
  }

  /* Mobile Bottom Navigation */
  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    z-index: 1020;
    justify-content: space-around;
    align-items: center;
    padding: 0 4px;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.06);
  }

  .mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    height: 100%;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.68rem;
    font-weight: 500;
    gap: 3px;
    cursor: pointer;
    transition: var(--transition);
  }

  .mobile-nav-item i {
    font-size: 1.15rem;
  }

  .mobile-nav-item.active {
    color: var(--primary);
    font-weight: 700;
  }

  /* Show horizontal scroll hint on mobile */
  .mobile-scroll-hint {
    display: flex;
  }

  /* 2x2 Stats Grid on mobile */
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
  }

  .stat-card {
    padding: 12px 14px;
  }

  .stat-info .stat-value {
    font-size: 1.35rem;
  }

  .stat-icon {
    width: 38px;
    height: 38px;
    font-size: 1.1rem;
  }

  /* Action Bar on mobile */
  .action-bar {
    padding: 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .action-bar-left,
  .action-bar-right {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .search-box,
  .action-bar select,
  .action-bar .btn {
    width: 100% !important;
  }

  /* Daily Attendance rows on mobile: Card style */
  .daily-att-row {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 10px !important;
    padding: 14px 12px !important;
  }

  .daily-att-row .attendance-toggle-group {
    width: 100% !important;
    display: grid !important;
    grid-template-columns: 1fr 1fr 1fr !important;
  }

  .daily-att-row .att-btn {
    justify-content: center !important;
    padding: 8px 4px !important;
    font-size: 0.85rem !important;
  }

  /* Sticky second column on mobile: slightly narrower so it doesn't take half screen */
  .data-table th:nth-child(2),
  .data-table td:nth-child(2) {
    min-width: 135px;
    max-width: 150px;
    font-size: 0.82rem;
    padding: 8px;
  }

  .grade-input {
    width: 50px;
    font-size: 16px; /* Prevents auto zoom in iOS */
    padding: 5px 2px;
  }

  .form-control {
    font-size: 16px !important; /* Prevents auto zoom in iOS */
  }

  .toast-container {
    bottom: 72px;
    left: 12px;
    right: 12px;
  }

  .toast {
    min-width: auto;
    max-width: 100%;
  }

  #server-status-badge span {
    display: none;
  }

  #server-status-badge {
    padding: 6px 10px;
  }

  .login-card {
    padding: 24px 18px;
  }
}