/* ====================================================
   NexGen School Management System - Main Stylesheet
   Premium Dark Mode Design
   ==================================================== */

/* === GOOGLE FONTS === */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* === CSS VARIABLES === */
:root {
  --bg-primary:   #0d0f17;
  --bg-secondary: #13161f;
  --bg-card:      #1a1d2a;
  --bg-input:     #1e2130;
  --bg-hover:     #242840;

  --accent:       #6c63ff;
  --accent-light: #7f77ff;
  --accent-dark:  #554de0;
  --accent-glow:  rgba(108, 99, 255, 0.25);

  --success:      #22c55e;
  --warning:      #f59e0b;
  --danger:       #ef4444;
  --info:         #38bdf8;
  --teal:         #14b8a6;
  --orange:       #f97316;

  --text-primary:   #f1f3f9;
  --text-secondary: #8b92a9;
  --text-muted:     #525975;

  --border:    #252836;
  --border-light: #2e3348;

  --sidebar-width: 260px;
  --header-height: 64px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(108,99,255,0.3);

  --transition: 0.2s ease;
  --font-main: 'Inter', sans-serif;
  --font-heading: 'Plus Jakarta Sans', sans-serif;
}

/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }

img { max-width: 100%; }
ul { list-style: none; }

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 30px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* =============================================
   LAYOUT
   ============================================= */
.app-wrapper {
  display: flex;
  min-height: 100vh;
}

/* === SIDEBAR === */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform var(--transition), width var(--transition);
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-logo {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: var(--header-height);
}

.sidebar-logo .logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  font-weight: 800;
  color: white;
  flex-shrink: 0;
  box-shadow: var(--shadow-glow);
}

.sidebar-logo .logo-text {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.sidebar-logo .logo-sub {
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 400;
}

/* School selector */
.school-selector {
  margin: 12px 12px 4px;
  padding: 10px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
}

.school-selector .school-avatar {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--teal), var(--accent));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: white;
  flex-shrink: 0;
}

.school-selector .school-info { flex: 1; overflow: hidden; }
.school-selector .school-name { font-size: 12px; font-weight: 600; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.school-selector .school-session { font-size: 10px; color: var(--text-muted); }

/* Nav groups */
.nav-group { padding: 8px 0; }
.nav-group-label {
  padding: 8px 20px 4px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  margin: 2px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}

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

.nav-item.active {
  background: var(--accent-glow);
  color: var(--accent-light);
  font-weight: 600;
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: -8px;
  width: 3px; height: 20px;
  background: var(--accent);
  border-radius: 0 4px 4px 0;
}

.nav-item .nav-icon {
  width: 20px; height: 20px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.nav-item .nav-badge {
  margin-left: auto;
  background: var(--accent);
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 20px;
  min-width: 20px;
  text-align: center;
}

/* Sub-menu */
.nav-item.has-sub .nav-arrow {
  margin-left: auto;
  font-size: 12px;
  transition: transform var(--transition);
}

.nav-item.has-sub.open .nav-arrow { transform: rotate(90deg); }

.nav-submenu {
  display: none;
  padding-left: 30px;
}

.nav-submenu.open { display: block; }

.nav-submenu .nav-item {
  font-size: 12.5px;
  padding: 8px 16px;
  margin: 1px 8px;
}

/* Sidebar footer */
.sidebar-footer {
  margin-top: auto;
  padding: 16px;
  border-top: 1px solid var(--border);
}

.user-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
}
.user-card:hover { background: var(--bg-hover); }

.user-avatar {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--orange));
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: white;
  flex-shrink: 0;
}

.user-info { flex: 1; overflow: hidden; }
.user-name { font-size: 13px; font-weight: 600; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-role { font-size: 11px; color: var(--text-muted); text-transform: capitalize; }

/* === MAIN CONTENT === */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* === TOP HEADER === */
.top-header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px;
}

.page-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  margin-left: 4px;
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--text-muted); }

.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-btn {
  width: 36px; height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  transition: all var(--transition);
  position: relative;
}
.header-btn:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--accent); }
.header-btn .notif-dot {
  position: absolute;
  top: 6px; right: 7px;
  width: 7px; height: 7px;
  background: var(--danger);
  border-radius: 50%;
  border: 2px solid var(--bg-secondary);
}

/* === PAGE CONTENT === */
.page-content {
  flex: 1;
  padding: 24px;
}

/* =============================================
   CARDS & STAT WIDGETS
   ============================================= */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--transition);
}

.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-card:hover::before { opacity: 1; }

.stat-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.stat-icon.purple { background: rgba(108,99,255,0.15); color: var(--accent); }
.stat-icon.green  { background: rgba(34,197,94,0.15);  color: var(--success); }
.stat-icon.orange { background: rgba(249,115,22,0.15); color: var(--orange); }
.stat-icon.blue   { background: rgba(56,189,248,0.15); color: var(--info); }
.stat-icon.teal   { background: rgba(20,184,166,0.15); color: var(--teal); }
.stat-icon.red    { background: rgba(239,68,68,0.15);  color: var(--danger); }

.stat-body { flex: 1; }
.stat-value {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
}
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 2px; }
.stat-change {
  font-size: 11px;
  margin-top: 8px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.stat-change.up   { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* Card component */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.card-title {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}

.card-body { padding: 20px; }
.card-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

/* =============================================
   TABLES
   ============================================= */
.table-wrapper { overflow-x: auto; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.data-table th {
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.data-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr { transition: background var(--transition); }
.data-table tbody tr:hover { background: var(--bg-hover); }

.student-cell { display: flex; align-items: center; gap: 10px; }
.student-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}
.student-avatar-placeholder {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; color: white;
  flex-shrink: 0;
}
.student-name { font-weight: 600; font-size: 13.5px; }
.student-id   { font-size: 11px; color: var(--text-muted); }

/* =============================================
   BADGES
   ============================================= */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
}
.badge-purple { background: rgba(108,99,255,0.15); color: var(--accent); }
.badge-blue   { background: rgba(56,189,248,0.15); color: var(--info); }
.badge-green  { background: rgba(34,197,94,0.15);  color: var(--success); }
.badge-red    { background: rgba(239,68,68,0.15);  color: var(--danger); }
.badge-orange { background: rgba(249,115,22,0.15); color: var(--orange); }
.badge-teal   { background: rgba(20,184,166,0.15); color: var(--teal); }
.badge-gray   { background: rgba(139,146,169,0.15); color: var(--text-secondary); }

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: var(--font-main);
}

.btn-primary {
  background: var(--accent);
  color: white;
}
.btn-primary:hover { background: var(--accent-light); box-shadow: var(--shadow-glow); transform: translateY(-1px); color: white; }

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-hover); border-color: var(--accent); color: var(--text-primary); }

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

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

.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #d97706; color: white; }

.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }
.btn-icon { padding: 8px; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover { background: var(--accent); color: white; }

/* =============================================
   FORMS
   ============================================= */
.form-group { margin-bottom: 18px; }

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13.5px;
  font-family: var(--font-main);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-control::placeholder { color: var(--text-muted); }

select.form-control { cursor: pointer; }

.form-control-sm { padding: 7px 12px; font-size: 12.5px; }

.form-hint { font-size: 11px; color: var(--text-muted); margin-top: 4px; }
.form-error { font-size: 11px; color: var(--danger); margin-top: 4px; }

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

/* =============================================
   MODAL
   ============================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.open { display: flex; }

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.92) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-lg { max-width: 720px; }
.modal-xl { max-width: 900px; }

.modal-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}

.modal-close {
  width: 30px; height: 30px;
  background: var(--bg-input);
  border: none;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover { background: var(--danger); color: white; }

.modal-body { padding: 20px 24px; }
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* =============================================
   ACTION MENU / DROPDOWN
   ============================================= */
.action-menu { position: relative; display: inline-block; }
.action-menu-btn {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 14px;
  transition: all var(--transition);
}
.action-menu-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

.action-dropdown {
  position: absolute;
  right: 0;
  top: calc(100% + 4px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  min-width: 150px;
  z-index: 10;
  display: none;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.action-dropdown.open { display: block; }

.action-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.action-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.action-item.danger:hover { background: rgba(239,68,68,0.1); color: var(--danger); }

/* =============================================
   ALERTS / TOAST
   ============================================= */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 16px;
}

.alert-success { background: rgba(34,197,94,0.1); border: 1px solid rgba(34,197,94,0.3); color: var(--success); }
.alert-danger   { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3);  color: var(--danger); }
.alert-warning  { background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.3); color: var(--warning); }
.alert-info     { background: rgba(56,189,248,0.1); border: 1px solid rgba(56,189,248,0.3); color: var(--info); }

/* Toast container */
#toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  min-width: 280px;
  max-width: 360px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease;
  font-size: 13.5px;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(50px); }
  to   { opacity: 1; transform: translateX(0); }
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast.info    { border-left: 3px solid var(--info); }

.toast-icon { font-size: 18px; }
.toast.success .toast-icon { color: var(--success); }
.toast.error .toast-icon   { color: var(--danger); }
.toast.warning .toast-icon { color: var(--warning); }
.toast.info .toast-icon    { color: var(--info); }

.toast-body { flex: 1; }
.toast-title { font-weight: 600; color: var(--text-primary); }
.toast-msg { color: var(--text-secondary); font-size: 12px; }

/* =============================================
   SEARCH & FILTER BAR
   ============================================= */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.search-input-wrap {
  position: relative;
  flex: 1;
  min-width: 200px;
}
.search-input-wrap .search-icon {
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
}
.search-input-wrap input {
  padding-left: 36px;
}

/* =============================================
   PAGINATION
   ============================================= */
.pagination {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 12px 0 0;
  justify-content: center;
}

.page-btn {
  min-width: 34px;
  height: 34px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
  padding: 0 10px;
}
.page-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.page-btn.active { background: var(--accent); border-color: var(--accent); color: white; }
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* =============================================
   CHARTS
   ============================================= */
.chart-wrap { position: relative; width: 100%; }

/* =============================================
   EMPTY STATE
   ============================================= */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}
.empty-state .empty-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.5; }
.empty-state h4 { font-size: 16px; color: var(--text-secondary); margin-bottom: 6px; }
.empty-state p  { font-size: 13px; }

/* =============================================
   LOADING SPINNER
   ============================================= */
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 24px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

.table-loading {
  text-align: center;
  padding: 32px;
  color: var(--text-muted);
}

/* =============================================
   PROFILE CARD (student/staff detail)
   ============================================= */
.profile-header {
  display: flex;
  align-items: flex-end;
  gap: 20px;
  padding: 24px;
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  border-bottom: 1px solid var(--border);
}

.profile-photo {
  width: 90px; height: 90px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent);
  flex-shrink: 0;
}

.profile-photo-placeholder {
  width: 90px; height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  display: flex; align-items: center; justify-content: center;
  font-size: 36px; font-weight: 800; color: white;
  border: 3px solid var(--accent-glow);
  flex-shrink: 0;
}

.profile-info { flex: 1; }
.profile-name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
}
.profile-sub { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

/* =============================================
   ATTENDANCE GRID
   ============================================= */
.attendance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}

.attendance-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.att-radio-group {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.att-radio {
  display: none;
}

.att-label {
  padding: 3px 8px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all var(--transition);
}

.att-radio:checked + .att-label { color: white; }
.att-radio[value="present"]:checked + .att-label { background: var(--success); border-color: var(--success); }
.att-radio[value="absent"]:checked  + .att-label { background: var(--danger);  border-color: var(--danger); }
.att-radio[value="late"]:checked    + .att-label { background: var(--warning); border-color: var(--warning); }

/* =============================================
   LOGIN PAGE
   ============================================= */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}

.login-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(108,99,255,0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(20,184,166,0.08) 0%, transparent 50%);
}

.login-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.login-logo {
  text-align: center;
  margin-bottom: 28px;
}

.login-logo-icon {
  width: 60px; height: 60px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: var(--radius-md);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 28px; font-weight: 900; color: white;
  box-shadow: var(--shadow-glow);
  margin-bottom: 12px;
}

.login-logo h1 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
}

.login-logo p {
  font-size: 13px;
  color: var(--text-muted);
}

/* =============================================
   UTILITY CLASSES
   ============================================= */
.d-flex    { display: flex; }
.d-grid    { display: grid; }
.flex-1    { flex: 1; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8     { gap: 8px; }
.gap-12    { gap: 12px; }
.gap-16    { gap: 16px; }
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-muted  { color: var(--text-muted); font-size: 13px; }
.text-small  { font-size: 12px; }
.fw-600    { font-weight: 600; }
.fw-700    { font-weight: 700; }
.mb-8      { margin-bottom: 8px; }
.mb-16     { margin-bottom: 16px; }
.mb-24     { margin-bottom: 24px; }
.mt-8      { margin-top: 8px; }
.mt-16     { margin-top: 16px; }
.p-16      { padding: 16px; }
.p-24      { padding: 24px; }
.w-100     { width: 100%; }

/* Colors */
.text-success { color: var(--success); }
.text-danger  { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-info    { color: var(--info); }
.text-accent  { color: var(--accent); }

/* =============================================
   RESPONSIVE LAYOUT
   ============================================= */
@media screen and (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
  }
  .header-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

@media screen and (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-content { padding: 16px; }
  .top-header { padding: 0 16px; }
  .form-row { grid-template-columns: 1fr; }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .modal { max-width: 100%; margin: 0 8px; }
  .modal-lg, .modal-xl { max-width: 100%; }
}

@media screen and (max-width: 480px) {
  .stats-grid,
  .quick-stats-grid,
  .quick-stats-5grid { grid-template-columns: 1fr !important; }
  .stat-value { font-size: 22px; }
  .login-card { padding: 24px 20px; margin: 16px; border-radius: var(--radius-lg); }
  .data-table th, .data-table td { padding: 10px 12px; }
  .save-bar {
    flex-direction: column !important;
    padding: 12px 16px !important;
    gap: 8px !important;
    text-align: center !important;
  }
  .save-bar .status {
    text-align: center !important;
    font-size: 12px !important;
    margin-bottom: 4px;
  }
  .save-bar button, .save-bar .btn {
    width: 100% !important;
    justify-content: center !important;
  }
}

/* =============================================
   SIDEBAR OVERLAY (mobile)
   ============================================= */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 99;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.open { display: block; }

/* =============================================
   PRINT STYLES
   ============================================= */
@media print {
  .sidebar, .top-header, .btn, .filter-bar, .pagination { display: none !important; }
  .main-content { margin-left: 0 !important; }
  body { background: white; color: black; }
  .card { border: 1px solid #ccc; }
  .data-table th { background: #f0f0f0 !important; color: black !important; }
  .data-table td { color: black !important; }
}

/* =============================================
   PROGRESS BARS
   ============================================= */
.progress-wrap { background: var(--bg-input); border-radius: 20px; height: 6px; overflow: hidden; }
.progress-bar  { height: 100%; border-radius: 20px; background: var(--accent); transition: width 0.5s ease; }
.progress-bar.green  { background: var(--success); }
.progress-bar.orange { background: var(--orange); }
.progress-bar.red    { background: var(--danger); }

/* =============================================
   MOBILE BOTTOM NAVIGATION BAR
   ============================================= */
.bottom-nav {
  display: none;
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: 60px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  z-index: 999;
  justify-content: space-around;
  align-items: center;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 10px;
  text-decoration: none;
  flex: 1;
  height: 100%;
  transition: color var(--transition), transform var(--transition);
}

.bottom-nav-item:active {
  transform: scale(0.92);
}

.bottom-nav-item.active {
  color: var(--accent-light);
  font-weight: 600;
}

.bottom-nav-icon {
  font-size: 18px;
  margin-bottom: 2px;
  opacity: 0.8;
  transition: transform var(--transition), opacity var(--transition);
}

.bottom-nav-item.active .bottom-nav-icon {
  transform: translateY(-2px);
  opacity: 1;
  text-shadow: 0 0 10px var(--accent-glow);
}

/* =============================================
   RESPONSIVE GRID UTILITIES
   ============================================= */
.quick-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.dashboard-grid-1-2 {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 16px;
}
.dashboard-grid-2-1 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
}
.quick-stats-3grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.quick-stats-5grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.profile-dl {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 8px 12px;
}

/* =============================================
   MOBILE OVERRIDES & GENERAL ENHANCEMENTS
   ============================================= */
@media screen and (max-width: 1024px) {
  .quick-stats-5grid {
    grid-template-columns: repeat(3, 1fr) !important;
  }
}

@media screen and (max-width: 768px) {
  .bottom-nav {
    display: flex;
  }
  
  body {
    padding-bottom: 70px; /* Safe space for bottom-nav */
  }

  .quick-stats-grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  .quick-stats-3grid {
    grid-template-columns: 1fr !important;
  }
  .quick-stats-5grid {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  .dashboard-grid,
  .dashboard-grid-1-2,
  .dashboard-grid-2-1 {
    grid-template-columns: 1fr !important;
  }
  .profile-dl {
    grid-template-columns: 1fr !important;
    gap: 4px 0 !important;
  }
  .profile-dl dt {
    margin-top: 6px;
  }
  .profile-header {
    flex-direction: column !important;
    align-items: center !important;
    text-align: center !important;
    gap: 16px !important;
    padding: 20px 16px !important;
  }
  .profile-photo, .profile-photo-placeholder {
    margin: 0 auto !important;
  }
  .profile-info {
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
  }
  .summary-bar,
  .fee-summary {
    display: grid !important;
    grid-template-columns: 1fr !important;
    gap: 12px !important;
    background: transparent !important;
  }
  .summary-bar > div,
  .fee-summary > div {
    border-radius: var(--radius-md) !important;
    border: 1px solid var(--border) !important;
  }

  /* Make header look compact and clean on mobile */
  .top-header {
    height: 56px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 90;
  }

  .page-title {
    font-size: 16px !important;
  }

  .breadcrumb {
    display: none !important; /* Hide breadcrumbs on mobile to save vertical real estate */
  }

  /* Touch-friendly buttons and inputs */
  .btn, .form-control {
    min-height: 40px;
    font-size: 14px !important;
  }
  
  .form-group label {
    font-size: 12px !important;
  }

  /* Enhanced table visibility for small screens */
  .table-wrapper {
    border-radius: var(--radius-md);
    margin: 0;
    border: 1px solid var(--border);
  }

  .data-table th, .data-table td {
    padding: 12px 10px !important;
    font-size: 12px !important;
  }

  /* Improve grid columns stacking */
  .timetable-days-grid {
    grid-template-columns: 1fr !important;
  }

  .import-grid {
    grid-template-columns: 1fr !important;
    gap: 16px;
  }

  .card {
    border-radius: var(--radius-md);
    margin-bottom: 16px;
  }

  .card-header {
    padding: 12px 16px !important;
  }

  .card-body {
    padding: 16px !important;
  }

  /* Parent Child card improvements */
  .child-header {
    padding: 14px 16px !important;
  }

  .child-avatar {
    width: 44px;
    height: 44px;
    font-size: 18px;
  }

  .child-stats {
    grid-template-columns: repeat(2, 1fr) !important;
  }

  .child-body {
    padding: 16px !important;
  }

  .quick-links .btn {
    flex: 1;
    min-width: 100px;
    text-align: center;
  }
}