/* Base and Theme */
:root {
  /* Brand palette inspired by tlwaci.jpg */
  --primary-900: #0b4ea2; /* deep royal */
  --primary-700: #1258c4; /* strong blue */
  --primary-600: #1f6ed4; /* vivid blue */
  --primary-500: #2f80ed; /* accent blue */
  --primary-100: #e6f0ff; /* light tint */
  --bg: #f5f8ff; /* page background */
  --text: #0f172a; /* slate-900 */
  --muted: #6b7280; /* gray-500 */
  --card: #ffffff;
  --border: #e5e7eb; /* gray-200 */
  --success-bg: #d1fae5;
  --success-border: #a7f3d0;
  --success-text: #065f46;
  --warn-bg: #fff7ed;
  --warn-border: #ffedd5;
  --warn-text: #92400e;
  --error-bg: #fee2e2;
  --error-border: #fecaca;
  --error-text: #7f1d1d;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: var(--bg);
}

a { color: inherit; }

/* Layout */
.sidebar {
  width: 250px;
  background: linear-gradient(180deg, var(--primary-900) 0%, var(--primary-700) 50%, var(--primary-600) 100%);
  color: #fff;
  height: 100vh;
  padding: 24px 16px;
  position: fixed;
  top: 0;
  left: 0;
  box-shadow: 4px 0 20px rgba(11, 78, 162, 0.15);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(10px);
}

.sidebar-header { 
  display: flex; 
  flex-direction: column; 
  align-items: center; 
  margin-bottom: 32px;
  position: relative;
}

.logo-container {
  position: relative;
  margin-bottom: 16px;
}

.sidebar-logo { 
  width: 72px; 
  height: 72px; 
  object-fit: cover; 
  border-radius: 16px; 
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  border: 3px solid rgba(255,255,255,0.1);
  transition: all 0.3s ease;
  position: relative;
  z-index: 2;
}

.logo-glow {
  position: absolute;
  top: -8px;
  left: -8px;
  right: -8px;
  bottom: -8px;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  border-radius: 20px;
  z-index: 1;
  animation: logoGlow 3s ease-in-out infinite alternate;
}

@keyframes logoGlow {
  0% { opacity: 0.3; transform: scale(1); }
  100% { opacity: 0.6; transform: scale(1.05); }
}

.sidebar h2 {
  text-align: center;
  margin: 0 0 8px 0;
  font-weight: 800;
  letter-spacing: 0.5px;
  font-size: 20px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.sidebar-subtitle {
  color: rgba(255,255,255,0.7);
  font-size: 12px;
  font-weight: 500;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.sidebar-nav { 
  flex: 1; 
  margin-top: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-section {
  margin-bottom: 24px;
}

.nav-section-title {
  color: rgba(255,255,255,0.5);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin: 0 0 12px 0;
  padding-left: 8px;
}

.nav-link {
  display: flex;
  align-items: center;
  color: rgba(255,255,255,0.8);
  padding: 12px 16px;
  text-decoration: none;
  border-radius: 12px;
  transition: all 0.3s ease;
  margin: 2px 0;
  position: relative;
  overflow: hidden;
}

.nav-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, rgba(255,255,255,0.15), transparent);
  transition: width 0.3s ease;
}

.nav-link:hover::before {
  width: 100%;
}

.nav-link:hover {
  background: rgba(255,255,255,0.1);
  color: #ffffff;
  transform: translateX(4px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.nav-icon {
  font-size: 18px;
  margin-right: 12px;
  width: 24px;
  text-align: center;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.2));
}

.nav-text {
  font-weight: 500;
  font-size: 14px;
}

.sidebar-footer { 
  margin-top: auto; 
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.admin-info {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
  padding: 12px;
  background: rgba(255,255,255,0.05);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.1);
}

.admin-avatar {
  font-size: 24px;
  margin-right: 12px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.admin-details {
  flex: 1;
}

.admin-name {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 2px;
}

.admin-role {
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.logout-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 16px;
  color: #fde68a;
  border: 1px solid rgba(253, 230, 138, 0.3);
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.3s ease;
  background: rgba(253, 230, 138, 0.05);
}

.logout-link:hover {
  background: rgba(253, 230, 138, 0.15);
  color: #fef3c7;
  border-color: rgba(253, 230, 138, 0.5);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(253, 230, 138, 0.2);
}

.logout-icon {
  margin-right: 8px;
  font-size: 16px;
}

.main-content { 
  padding: 24px; 
  margin-left: 90px; /* Default collapsed sidebar width */
  transition: margin-left 0.25s ease;
}

.main-content.sidebar-expanded {
  margin-left: 250px; /* Expanded sidebar width */
}

/* Responsive helpers */
.mobile-nav-toggle {
  display: none;
  position: fixed;
  left: 12px;
  top: 12px;
  z-index: 1100;
  padding: 8px 12px;
  background: var(--primary-600);
  color: #fff;
  border: none;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

@media (max-width: 1024px) {
  .sidebar { transform: translateX(-260px); transition: transform 0.25s ease; }
  .sidebar.open { transform: translateX(0); }
  .main-content { 
    padding: 16px; 
    margin-left: 0 !important;
    width: 100% !important;
    grid-template-columns: 1fr !important; 
  }
  .mobile-nav-toggle { display: inline-block; }
  
  /* Mobile-specific improvements */
  .card { padding: 16px; }
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  h3 { font-size: 18px; }
  
  /* Make grids single column on mobile */
  .grid-responsive,
  [style*="grid-template-columns"] {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
  }
  
  /* Better mobile table handling */
  .table-responsive,
  .students-table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 8px;
  }
  
  .table-responsive table,
  .students-table {
    min-width: 700px;
    font-size: 13px;
  }
  
  .students-table th,
  .students-table td {
    padding: 8px 12px;
  }
  
  /* Mobile-friendly buttons */
  .btn {
    padding: 10px 16px;
    font-size: 14px;
    min-height: 44px;
    white-space: nowrap;
  }
  
  /* Mobile form improvements */
  form[style*="grid"] {
    display: flex !important;
    flex-direction: column !important;
    gap: 12px !important;
  }
  
  /* Mobile modal improvements */
  .modal {
    width: 95vw !important;
    max-width: 500px !important;
    margin: 20px auto !important;
    max-height: 90vh !important;
    overflow-y: auto;
  }
  
  .modal-body {
    padding: 16px !important;
  }
  
  /* Mobile card stacking */
  .card-grid {
    display: flex !important;
    flex-direction: column !important;
    gap: 12px !important;
  }
}

/* Fine-tune parent portal spacing */
.parent-layout-tight { padding-left: 8px !important; }

@media (max-width: 640px) {
  body {
    font-size: 14px;
  }
  
  .card { 
    padding: 14px; 
    margin-bottom: 12px;
  }
  
  h1 { font-size: 22px; margin-bottom: 16px; }
  h2 { font-size: 18px; margin-bottom: 12px; }
  h3 { font-size: 16px; margin-bottom: 10px; }
  
  input[type="text"], 
  input[type="number"], 
  input[type="password"], 
  input[type="email"],
  input[type="tel"],
  input[type="date"],
  select, 
  textarea { 
    font-size: 16px; /* Prevents zoom on iOS */
    padding: 12px;
    min-height: 44px;
    width: 100%;
  }
  
  /* Mobile-specific admin improvements */
  .main-content { 
    padding: 12px; 
  }
  
  /* Make all grids single column on small mobile */
  [style*="grid-template-columns"],
  .grid-responsive {
    display: flex !important;
    flex-direction: column !important;
    gap: 12px !important;
  }
  
  /* Better mobile form layouts */
  form[style*="display:grid"] {
    display: flex !important;
    flex-direction: column !important;
    gap: 12px !important;
  }
  
  /* Mobile table improvements */
  .students-table,
  table { 
    font-size: 12px;
    min-width: 600px;
  }
  
  .students-table th, 
  .students-table td,
  table th, 
  table td {
    padding: 6px 8px;
    font-size: 12px;
  }
  
  /* Mobile card spacing */
  .card + .card {
    margin-top: 12px;
  }
  
  /* Mobile button improvements */
  .btn {
    width: 100%;
    padding: 12px;
    font-size: 14px;
    margin-bottom: 8px;
  }
  
  .btn-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  
  .btn-group .btn {
    margin: 0;
  }
  
  /* Mobile modal improvements */
  .modal {
    width: 95vw !important;
    max-width: none !important;
    margin: 10px auto !important;
    max-height: 95vh !important;
  }
  
  .modal-header {
    padding: 12px 16px !important;
    flex-wrap: wrap;
  }
  
  .modal-body {
    padding: 12px 16px !important;
  }
  
  .modal-footer {
    padding: 12px 16px 16px 16px !important;
    flex-direction: column;
    gap: 8px;
  }
  
  .modal-footer .btn {
    width: 100%;
    margin: 0;
  }
  
  /* Mobile search and filter improvements */
  .search-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  
  .filter-row {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  
  /* Mobile pagination */
  .pagination {
    justify-content: center;
    flex-wrap: wrap;
    gap: 4px;
  }
  
  .pagination a,
  .pagination span {
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  /* Mobile stats cards */
  .stats-grid {
    display: flex !important;
    flex-direction: column !important;
    gap: 12px !important;
  }
  
  /* Mobile datetime display */
  #datetime {
    min-width: auto !important;
    text-align: center !important;
    order: -1;
    margin-bottom: 12px;
  }
  
  /* Mobile header adjustments */
  .main-content > div:first-child {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 12px !important;
  }
}

/* Make wide tables scroll on small screens */
@media (max-width: 768px) {
  table { display: block; overflow-x: auto; white-space: nowrap; }
  th, td { padding: 10px; }
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.card + .card { margin-top: 16px; }

h1, h2, h3 { color: var(--primary-900); }
h1 { margin-top: 0; }

/* Forms */
label { display:block; margin: 10px 0 6px; color: #0f172a; font-weight: 600; }
input[type="text"], input[type="number"], input[type="password"], select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
input:focus, select:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.25);
}

.btn {
  display: inline-block;
  margin-top: 12px;
  padding: 10px 14px;
  border: none;
  background: var(--primary-600);
  color: #fff;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.02s ease;
}
.btn:hover { background: var(--primary-700); }
.btn:active { transform: translateY(1px); }
.btn:disabled { background: #9bb9e0; cursor: not-allowed; }

.btn-secondary { background: #0ea5e9; }
.btn.btn-secondary { background: #e5e7eb; color: #0f172a; border: 1px solid #d1d5db; }
.btn-danger { background: #ef4444; }

/* Icon Buttons */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 8px;
  font-size: 16px;
  text-decoration: none;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
}

.btn-icon:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-edit {
  background: #10b981;
  color: white;
}

.btn-edit:hover {
  background: #059669;
}

.btn-delete {
  background: #ef4444;
  color: white;
}

.btn-delete:hover {
  background: #dc2626;
}

.btn-link {
  background: var(--primary-600);
  color: white;
}

.btn-link:hover {
  background: var(--primary-700);
}

/* Notices */
.notice {
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--warn-border);
  background: var(--warn-bg);
  color: var(--warn-text);
  margin: 12px 0;
}
.notice.error { background: var(--error-bg); border-color: var(--error-border); color: var(--error-text); }
.notice.success { background: var(--success-bg); border-color: var(--success-border); color: var(--success-text); }

/* Tables */
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--border); }
th { background: #f7faff; color: #0f172a; text-align: left; }
tbody tr:nth-child(even) { background: #fafcff; }
tbody tr:hover { background: #f0f6ff; }

/* Auth */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at -10% -10%, #e8f0ff 20%, transparent 60%),
              radial-gradient(1000px 600px at 120% 120%, #e8f0ff 20%, transparent 60%),
              var(--bg);
}
.auth-card { width: 360px; }
.muted { color: var(--muted); }


/* Global Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(800px 400px at 10% -10%, rgba(47,128,237,0.10), transparent 60%),
    radial-gradient(800px 400px at 90% 110%, rgba(47,128,237,0.10), transparent 60%),
    rgba(15,20,30,0.55);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal {
  width: min(92vw, 520px);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 30px 80px rgba(15, 23, 42, 0.25);
  padding: 22px 22px 18px;
  animation: modalPop 220ms ease-out;
}

@keyframes modalPop {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}

.modal-header { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.modal-icon {
  width: 40px; height: 40px; border-radius: 12px; flex: 0 0 auto;
  display: grid; place-items: center; font-size: 20px; color: #fff;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-900));
  box-shadow: 0 6px 16px rgba(47,128,237,0.35);
}
.modal-title { margin: 0; font-size: 18px; font-weight: 800; color: var(--text); }
.modal-subtitle { margin: 2px 0 0; color: var(--muted); font-size: 13px; }

.modal-body { margin: 14px 0 16px; color: #1f2937; line-height: 1.5; }
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; }

.modal [data-action="close"] {
  position: absolute; right: 12px; top: 10px; background: transparent; border: 0;
  width: 36px; height: 36px; border-radius: 10px; cursor: pointer; color: #6b7280;
}
.modal [data-action="close"]:hover { background: #f3f4f6; color: #374151; }

/* Modal variants */
.modal-icon.info { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
.modal-icon.success { background: linear-gradient(135deg, #10b981, #059669); }
.modal-icon.warn { background: linear-gradient(135deg, #f59e0b, #d97706); }
.modal-icon.error { background: linear-gradient(135deg, #ef4444, #dc2626); }

.btn-neutral { background: #f3f4f6; color: #374151; }
.btn-neutral:hover { background: #e5e7eb; }
.btn-primary { background: var(--primary-600); color: #fff; }
.btn-primary:hover { background: var(--primary-700); }

/* Modal Responsiveness for Admin */
@media (max-width: 768px) {
  .modal-overlay {
    padding: 8px !important;
    align-items: flex-start !important;
    padding-top: 20px !important;
  }

  .modal {
    width: 100% !important;
    max-width: none !important;
    margin: 0 !important;
    max-height: calc(100vh - 40px) !important;
    border-radius: 12px !important;
  }

  .modal-header {
    padding: 16px !important;
    flex-direction: column !important;
    text-align: center !important;
    gap: 12px !important;
  }

  .modal-header .modal-icon {
    margin: 0 auto !important;
  }

  .modal-title {
    font-size: 18px !important;
  }

  .modal-subtitle {
    font-size: 14px !important;
  }

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

  .modal-footer {
    padding: 16px !important;
    flex-direction: column !important;
    gap: 12px !important;
  }

  .modal-btn {
    width: 100% !important;
    padding: 12px !important;
    font-size: 16px !important;
  }

  /* Form inputs in modals */
  .modal input[type="text"],
  .modal input[type="email"],
  .modal input[type="number"],
  .modal input[type="password"],
  .modal select,
  .modal textarea {
    width: 100% !important;
    padding: 12px !important;
    font-size: 16px !important;
    margin-bottom: 16px !important;
  }

  .modal label {
    font-size: 14px !important;
    margin-bottom: 8px !important;
    display: block !important;
  }

  /* Grid layouts in modals */
  .modal [style*="grid-template-columns"] {
    grid-template-columns: 1fr !important;
    gap: 16px !important;
  }

  /* Specific modal adjustments */
  #linkStudentsModal .modal {
    max-width: 100% !important;
    width: 100% !important;
  }

  .cart-table {
    font-size: 14px !important;
  }

  .cart-table th,
  .cart-table td {
    padding: 8px 4px !important;
  }

  /* Close button positioning */
  .modal-close {
    position: relative !important;
    top: auto !important;
    right: auto !important;
    margin-top: 12px !important;
  }

  /* Modal header with close button */
  .modal-header {
    position: relative !important;
  }

  .modal-header .modal-close {
    position: absolute !important;
    top: 16px !important;
    right: 16px !important;
    margin-top: 0 !important;
  }
}

@media (max-width: 480px) {
  .modal-overlay {
    padding: 4px !important;
    padding-top: 10px !important;
  }

  .modal {
    border-radius: 8px !important;
    max-height: calc(100vh - 20px) !important;
  }

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

  .modal-body {
    padding: 12px !important;
  }

  .modal-footer {
    padding: 12px !important;
  }

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

  .modal-subtitle {
    font-size: 12px !important;
  }

  .modal-icon {
    width: 32px !important;
    height: 32px !important;
    font-size: 16px !important;
  }

  .modal-btn {
    padding: 10px !important;
    font-size: 14px !important;
  }

  /* Smaller form inputs on very small screens */
  .modal input[type="text"],
  .modal input[type="email"],
  .modal input[type="number"],
  .modal input[type="password"],
  .modal select,
  .modal textarea {
    padding: 10px !important;
    font-size: 14px !important;
  }
}

/* Landscape orientation adjustments */
@media (max-height: 600px) and (orientation: landscape) {
  .modal-overlay {
    padding: 8px !important;
    align-items: flex-start !important;
    padding-top: 10px !important;
  }

  .modal {
    max-height: calc(100vh - 20px) !important;
  }

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

  .modal-body {
    padding: 12px !important;
    max-height: 300px !important;
    overflow-y: auto !important;
  }

  .modal-footer {
    padding: 12px !important;
  }
}
.btn-danger { background: #ef4444; color: #fff; }
.btn-danger:hover { background: #dc2626; }