/*
  File: base.css
  Purpose: Shared base styles for all pages in MathTuro LMS
  Used by: Student, Teacher, Admin pages
*/

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Brand Colors */
  --primary-green: #005801;
  --light-green: #34C759;
  --brand: #005801;
  --brand-dark: #004601;
  --brand-light: #006B01;
  
  /* Accent Colors */
  --accent-purple: #7C0058;
  --accent-orange: #FEA501;
  
  /* Background Colors */
  --bg-light: #F5F5F5;
  --bg-white: #FFFFFF;
  
  /* Text Colors */
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;
  
  /* Primary Green Scale */
  --primary-50: #f0fdf4;
  --primary-100: #dcfce7;
  --primary-200: #bbf7d0;
  --primary-300: #86efac;
  --primary-400: #4ade80;
  --primary-500: #22c55e;
  --primary-600: #16a34a;
  --primary-700: #15803d;
  --primary-800: #166534;
  --primary-900: #14532d;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --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 -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

/* ============================================
   BASE STYLES
   ============================================ */
body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-light);
  color: var(--text-primary);
  line-height: 1.5;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
.font-montserrat { font-family: 'Montserrat', sans-serif; }
.font-kanit { font-family: 'Kanit', sans-serif; }

.gradient-text {
  background: linear-gradient(135deg, #005801 0%, #22c55e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   LAYOUT COMPONENTS
   ============================================ */
.glass-sidebar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
}

.sidebar-link {
  transition: all 0.2s ease;
}

/* ============================================
   CARD STYLES
   ============================================ */
.stat-card {
  transition: all 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-4px);
}

/* Neumorphic Effects */
.neu-flat {
  background: linear-gradient(135deg, #E8E8E8 0%, #FFFFFF 100%);
  box-shadow: -6px 6px 12px rgba(166, 166, 166, 0.2),
              6px -6px 12px rgba(166, 166, 166, 0.2),
              -6px -6px 12px rgba(255, 255, 255, 0.9),
              6px 6px 15px rgba(166, 166, 166, 0.9),
              inset 1px 1px 2px rgba(255, 255, 255, 0.3),
              inset -1px -1px 2px rgba(166, 166, 166, 0.5);
}

.neu-card {
  background: #E7F4E7;
  box-shadow: -6px 6px 12px rgba(92, 98, 92, 0.2),
              6px -6px 12px rgba(92, 98, 92, 0.2),
              -6px -6px 12px rgba(255, 255, 255, 0.9),
              6px 6px 15px rgba(92, 98, 92, 0.9),
              inset 1px 1px 2px rgba(255, 255, 255, 0.3),
              inset -1px -1px 2px rgba(92, 98, 92, 0.5);
}

/* ============================================
   BUTTON STYLES
   ============================================ */
.btn-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
}

.btn-primary:hover {
  box-shadow: 0 4px 15px rgba(0, 88, 1, 0.3);
  transform: translateY(-1px);
}

/* ============================================
   ANIMATION CLASSES
   ============================================ */
.notification-badge {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

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

/* ============================================
   CUSTOM SCROLLBAR
   ============================================ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: var(--brand); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand-dark); }

/* ============================================
   FORM STYLES
   ============================================ */
.form-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(0, 88, 1, 0.1);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-brand { color: var(--brand); }
.bg-brand { background-color: var(--brand); }
.border-brand { border-color: var(--brand); }

.progress-ring {
  transform: rotate(-90deg);
}

/* Video and Image Components */
.video-card:hover { transform: translateY(-2px); box-shadow: 0 10px 40px -12px rgba(0, 0, 0, 0.15); }
.quiz-card:hover { transform: translateY(-2px); box-shadow: 0 10px 40px -12px rgba(0, 0, 0, 0.15); }
.upload-zone:hover { border-color: #005801; background: rgba(0, 88, 1, 0.05); }
.upload-zone.drag-over { border-color: #005801; background: rgba(0, 88, 1, 0.1); }

/* PDF Viewer */
.pdf-container { height: 70vh; }

/* Image Gallery */
.image-gallery img { cursor: pointer; transition: transform 0.3s; }
.image-gallery img:hover { transform: scale(1.02); }

/* Lightbox */
.lightbox { background: rgba(0, 0, 0, 0.95); }