/* Modern Theme & Typography */
:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #16a34a;
  --success-light: #f0fdf4;
  --warning: #d97706;
  --warning-light: #fffbeb;
  --danger: #dc2626;
  --danger-light: #fef2f2;
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --radius: 12px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  background-color: #f1f5f9;
  color: #1e293b;
  line-height: 1.5;
  min-height: 100vh;
}

/* Navbar */
.navbar {
  background: #ffffff;
  border-bottom: 1px solid var(--slate-200);
  padding: 0.85rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--slate-900);
  font-weight: 700;
  font-size: 1.25rem;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #2563eb, #1e40af);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
  font-size: 1.2rem;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-link {
  text-decoration: none;
  color: var(--slate-600);
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
}

.nav-link:hover, .nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

/* Hero & Header */
.portal-header {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  color: #ffffff;
  padding: 3.5rem 1.5rem 4.5rem;
  text-align: center;
  position: relative;
}

.portal-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

.portal-header p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 650px;
  margin: 0 auto;
}

/* Card Container & Form Styling */
.form-container {
  max-width: 820px;
  margin: -2.5rem auto 4rem;
  padding: 0 1.25rem;
  position: relative;
  z-index: 10;
}

.glass-card {
  background: #ffffff;
  border-radius: 16px;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(226, 232, 240, 0.8);
  overflow: hidden;
}

.form-body {
  padding: 2.5rem;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--slate-900);
  border-bottom: 2px solid var(--slate-100);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
}

.section-title svg {
  color: var(--primary);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (max-width: 680px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
  .form-body {
    padding: 1.5rem;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group.col-span-2 {
  grid-column: span 2;
}

@media (max-width: 680px) {
  .form-group.col-span-2 {
    grid-column: span 1;
  }
}

.form-label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--slate-700);
  display: flex;
  align-items: center;
  gap: 4px;
}

.required-star {
  color: var(--danger);
}

.form-input, .form-select {
  padding: 10px 14px;
  border: 1.5px solid var(--slate-200);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--slate-900);
  background: #ffffff;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-input:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--slate-600);
}

/* Upload Dropzone */
.dropzone-box {
  border: 2px dashed #cbd5e1;
  background: #f8fafc;
  border-radius: 12px;
  padding: 1.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}

.dropzone-box:hover, .dropzone-box.dragover {
  border-color: var(--primary);
  background: #eff6ff;
}

.dropzone-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 0.75rem;
  color: var(--primary);
}

.dropzone-preview {
  display: none;
  width: 100%;
  max-height: 200px;
  object-fit: contain;
  border-radius: 8px;
  margin-top: 10px;
  border: 1px solid var(--slate-200);
}

.dropzone-preview.active {
  display: block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-success {
  background: var(--success);
  color: #ffffff;
}

.btn-success:hover {
  background: #15803d;
}

.btn-danger {
  background: var(--danger);
  color: #ffffff;
}

.btn-danger:hover {
  background: #b91c1c;
}

.btn-secondary {
  background: var(--slate-100);
  color: var(--slate-700);
  border: 1px solid var(--slate-200);
}

.btn-secondary:hover {
  background: var(--slate-200);
}

.btn-block {
  width: 100%;
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-pending {
  background: var(--warning-light);
  color: var(--warning);
  border: 1px solid #fde68a;
}

.badge-approved {
  background: var(--success-light);
  color: var(--success);
  border: 1px solid #bbf7d0;
}

.badge-rejected {
  background: var(--danger-light);
  color: var(--danger);
  border: 1px solid #fecaca;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: 1.5rem;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: #ffffff;
  border-radius: 16px;
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 650px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  padding: 2rem;
  position: relative;
}

.modal-overlay.active .modal-card {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--slate-600);
  cursor: pointer;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: var(--slate-100);
  color: var(--slate-900);
}

/* Canvas ID Card Preview */
.card-canvas-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  background: #0f172a;
  border-radius: 12px;
  padding: 1.5rem;
  overflow: auto;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.4);
}

canvas.id-card-canvas {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  background: #ffffff;
}

/* Admin Dashboard Specific */
.admin-container {
  max-width: 1400px;
  margin: 1.5rem auto 3rem;
  padding: 0 1.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: #ffffff;
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--slate-200);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.stat-val {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--slate-900);
}

.stat-lbl {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--slate-600);
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 8px;
  border-bottom: 2px solid var(--slate-200);
  margin-bottom: 1.5rem;
}

.tab-btn {
  padding: 10px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  background: none;
  color: var(--slate-600);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tab-btn:hover {
  color: var(--primary);
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-pane {
  display: none;
}

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

/* Data Table */
.table-wrapper {
  background: #ffffff;
  border-radius: 12px;
  border: 1px solid var(--slate-200);
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
}

table.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

table.admin-table th {
  background: var(--slate-50);
  padding: 12px 16px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--slate-600);
  border-bottom: 1px solid var(--slate-200);
}

table.admin-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--slate-200);
  font-size: 0.92rem;
  vertical-align: middle;
}

table.admin-table tr:hover {
  background: #f8fafc;
}

.student-avatar {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: cover;
  border: 1.5px solid var(--slate-200);
}

.receipt-thumb {
  width: 44px;
  height: 44px;
  border-radius: 6px;
  object-fit: cover;
  border: 1.5px solid #e2e8f0;
  cursor: pointer;
  transition: transform 0.15s;
}

.receipt-thumb:hover {
  transform: scale(1.08);
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999;
}

.toast {
  padding: 12px 20px;
  border-radius: 10px;
  color: #fff;
  font-size: 0.92rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.3s ease;
}

.toast-success { background: #16a34a; }
.toast-error { background: #dc2626; }
.toast-info { background: #2563eb; }

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}