/* =============================================
   EpassPack — Global Design System
   White & Orange Sri Lankan Theme
   ============================================= */

:root {
  /* Brand Colors */
  --primary: #FF6B35;
  --primary-dark: #E85D04;
  --primary-light: #FF8C5A;
  --primary-pale: #FFF0E8;
  --primary-gradient: linear-gradient(135deg, #FF6B35 0%, #E85D04 100%);

  /* Accent */
  --amber: #F7B731;
  --amber-dark: #E67E22;

  /* Neutrals */
  --white: #FFFFFF;
  --off-white: #FFF8F3;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  /* Semantic */
  --success: #10B981;
  --success-light: #D1FAE5;
  --error: #EF4444;
  --error-light: #FEE2E2;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --info: #3B82F6;

  /* Typography */
  --font-family: 'Inter', 'Poppins', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.16);
  --shadow-orange: 0 8px 24px rgba(255,107,53,0.25);

  /* Transitions */
  --transition: all 0.2s ease;
  --transition-slow: all 0.35s ease;
}

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

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

body {
  font-family: var(--font-family);
  background: var(--off-white);
  color: var(--gray-800);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* =============================================
   Utility Classes
   ============================================= */
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.text-center { text-align: center; }
.w-full { width: 100%; }

/* =============================================
   Buttons
   ============================================= */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.5rem;
  background: var(--primary-gradient);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(255,107,53,0.25);
  letter-spacing: 0.01em;
  width: 100%;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(255,107,53,0.35);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.75rem 1.75rem;
  background: white;
  color: var(--gray-700);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-pale);
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  background: var(--error);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.btn-danger:hover { background: #DC2626; transform: translateY(-1px); }

.btn-sm {
  padding: 0.5rem 1rem !important;
  font-size: var(--font-size-xs) !important;
  width: auto !important;
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  font-size: 1rem;
}
.btn-icon:hover { background: var(--gray-100); }

/* =============================================
   Form Elements
   ============================================= */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  flex: 1;
}

.form-group label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--gray-700);
}

.form-row {
  display: flex;
  gap: var(--space-4);
}
.form-row .form-group { flex: 1; }

@media (max-width: 600px) {
  .form-row { flex-direction: column; }
}

.form-row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

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

.input-wrap input,
.input-wrap textarea {
  padding-left: 2.5rem !important;
}

.input-icon {
  position: absolute;
  left: 0.75rem;
  font-size: 1rem;
  z-index: 1;
  pointer-events: none;
}

.toggle-pw {
  position: absolute;
  right: 0.75rem;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 0;
  opacity: 0.6;
  transition: var(--transition);
}
.toggle-pw:hover { opacity: 1; }

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  color: var(--gray-800);
  background: white;
  transition: var(--transition);
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,107,53,0.15);
}

input::placeholder, textarea::placeholder { color: var(--gray-400); }

textarea { resize: vertical; min-height: 80px; }

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--gray-600);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 1rem;
  height: 1rem;
  accent-color: var(--primary);
}

/* =============================================
   Error & Success Messages
   ============================================= */
.error-msg {
  background: var(--error-light);
  color: #991B1B;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  border-left: 4px solid var(--error);
  font-weight: 500;
}

.success-msg {
  background: var(--success-light);
  color: #065F46;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  border-left: 4px solid var(--success);
  font-weight: 500;
}

.warning-text { color: var(--error); font-size: var(--font-size-sm); }

/* =============================================
   Toast Notification
   ============================================= */
.toast {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  padding: 1rem 1.5rem;
  background: var(--gray-900);
  color: white;
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
  z-index: 10000;
  box-shadow: var(--shadow-lg);
  animation: slideInUp 0.3s ease;
  max-width: 340px;
}

.toast.toast-success { background: var(--success); }
.toast.toast-error { background: var(--error); }
.toast.toast-warning { background: var(--warning); color: var(--gray-900); }

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

/* =============================================
   Loading Overlay
   ============================================= */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  z-index: 9999;
}

.loading-overlay p {
  color: var(--gray-500);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--primary-pale);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* =============================================
   Modal
   ============================================= */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-4);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease;
}

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

.modal {
  background: white;
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  animation: scaleIn 0.2s ease;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-lg { max-width: 640px; }
.modal-xl { max-width: 800px; }

@keyframes scaleIn {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--gray-100);
}

.modal-header h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--gray-900);
}

.modal-close {
  background: var(--gray-100);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-size: 0.875rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-close:hover { background: var(--gray-200); }

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--gray-100);
}

.modal-footer .btn-primary,
.modal-footer .btn-secondary,
.modal-footer .btn-danger {
  width: auto;
}

/* =============================================
   Links
   ============================================= */
a { color: inherit; text-decoration: none; }

.link-accent {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}
.link-accent:hover { color: var(--primary-dark); text-decoration: underline; }

.link-sm {
  font-size: var(--font-size-sm);
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.link-sm:hover { text-decoration: underline; }

/* =============================================
   Pack Card
   ============================================= */
.pack-card {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-100);
  transition: var(--transition-slow);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.pack-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
}

.pack-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.pack-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.pack-icon {
  width: 52px;
  height: 52px;
  background: var(--primary-pale);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.pack-badge {
  font-size: var(--font-size-xs);
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--primary-pale);
  color: var(--primary-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pack-badge.locked { background: var(--gray-100); color: var(--gray-500); }
.pack-badge.alevel { background: #EDE9FE; color: #6D28D9; }
.pack-badge.olevel { background: #DBEAFE; color: #1D4ED8; }

.pack-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-1);
  line-height: 1.3;
}

.pack-subject {
  font-size: var(--font-size-sm);
  color: var(--gray-500);
  font-weight: 500;
  margin-bottom: var(--space-4);
}

.pack-meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  margin-bottom: var(--space-4);
}

.pack-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.pack-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pack-action-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius);
  font-size: var(--font-size-xs);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-start-pack {
  background: var(--primary-gradient);
  color: white;
  box-shadow: var(--shadow-orange);
}
.btn-start-pack:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(255,107,53,0.35); }

.btn-locked-pack {
  background: var(--gray-100);
  color: var(--gray-500);
}
.btn-locked-pack:hover { background: var(--gray-200); }

/* Skeleton Loading */
.pack-skeleton {
  background: var(--gray-100);
  border-radius: var(--radius-xl);
  height: 220px;
  animation: shimmer 1.5s infinite;
}

.attempt-skeleton {
  background: var(--gray-100);
  border-radius: var(--radius);
  height: 60px;
  margin-bottom: var(--space-3);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { background: var(--gray-100); }
  50% { background: var(--gray-200); }
  100% { background: var(--gray-100); }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--gray-400);
}

.empty-icon {
  font-size: 3.5rem;
  display: block;
  margin-bottom: var(--space-4);
}

.empty-state h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--gray-600);
  margin-bottom: var(--space-2);
}

.empty-state p {
  font-size: var(--font-size-sm);
  color: var(--gray-400);
}

/* =============================================
   Password Strength
   ============================================= */
.password-strength {
  height: 4px;
  border-radius: var(--radius-full);
  margin-top: 4px;
  transition: var(--transition);
}
.pw-weak { background: var(--error); width: 33%; }
.pw-medium { background: var(--warning); width: 66%; }
.pw-strong { background: var(--success); width: 100%; }

/* =============================================
   Filter Bar
   ============================================= */
.filter-bar {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
  background: white;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  flex: 1;
  min-width: 160px;
}

.filter-group label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Global Animations & Interactions --- */
@keyframes fadeInSlideUp {
  0% { opacity: 0; transform: translateY(15px); }
  100% { opacity: 1; transform: translateY(0); }
}

body {
  animation: fadeIn 0.3s ease-out;
}

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

.pack-card, .request-card, .review-item, .question-card, .start-card, .dashboard-stat {
  animation: fadeInSlideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0;
}

/* Stagger animation for multiple cards */
.pack-card:nth-child(1), .review-item:nth-child(1) { animation-delay: 0.05s; }
.pack-card:nth-child(2), .review-item:nth-child(2) { animation-delay: 0.1s; }
.pack-card:nth-child(3), .review-item:nth-child(3) { animation-delay: 0.15s; }
.pack-card:nth-child(4), .review-item:nth-child(4) { animation-delay: 0.2s; }
.pack-card:nth-child(5), .review-item:nth-child(5) { animation-delay: 0.25s; }

/* Click effects */
button:active, .pack-card:active, .option-item:active {
  transform: scale(0.97) !important;
  transition: transform 0.05s ease !important;
}

/* =============================================
   Global Mobile Optimization
   ============================================= */
@media (max-width: 768px) {
  :root {
    --space-8: 1.5rem;
    --space-10: 2rem;
  }
  
  .btn {
    min-height: 44px; /* Apple/Google touch target minimum */
  }

  .modal {
    width: 100%;
    max-height: 85vh;
  }

  /* Make sure side-by-side action buttons stack on small screens */
  .modal-footer {
    flex-direction: column;
    gap: 0.5rem;
  }
  .modal-footer .btn {
    width: 100%;
  }
}