/* ========================================
   EduCenter Mobile App - Design System
   ======================================== */

/* Icon Styles */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon-sm {
  font-size: 0.875rem;
}

.icon-md {
  font-size: 1.25rem;
}

.icon-lg {
  font-size: 1.5rem;
}

.icon-xl {
  font-size: 2rem;
}

:root {
  /* Colors - O'zbek bayrog'i ranglaridan ilhomlangan */
  --primary: #0066CC;
  --primary-dark: #004C99;
  --primary-light: #3385D6;
  --secondary: #00C853;
  --secondary-dark: #00A043;

  --accent: #FF6B35;
  --accent-light: #FF8C5F;

  --success: #00C853;
  --warning: #FFC107;
  --error: #F44336;
  --info: #2196F3;

  /* Neutral Colors */
  --white: #FFFFFF;
  --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;
  --black: #000000;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #0066CC 0%, #004C99 100%);
  --gradient-secondary: linear-gradient(135deg, #00C853 0%, #00A043 100%);
  --gradient-accent: linear-gradient(135deg, #FF6B35 0%, #FF8C5F 100%);
  --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #F9FAFB 100%);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --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);

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ========================================
   Container & Layout
   ======================================== */

.container {
  max-width: 428px;
  margin: 0 auto;
  background: var(--white);
  min-height: 100vh;
  position: relative;
  box-shadow: var(--shadow-xl);
}

.page {
  padding: var(--spacing-md);
  padding-bottom: 80px;
}

.page-header {
  padding: var(--spacing-lg) var(--spacing-md);
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  margin-bottom: var(--spacing-lg);
}

.page-header * {
  color: var(--white) !important;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--white);
}

.page-subtitle {
  font-size: 0.95rem;
  opacity: 0.9;
  color: var(--white);
}

/* ========================================
   Typography
   ======================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1.125rem;
}

h5 {
  font-size: 1rem;
}

h6 {
  font-size: 0.875rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--gray-600);
}

.text-primary {
  color: var(--primary);
}

.text-secondary {
  color: var(--secondary);
}

.text-accent {
  color: var(--accent);
}

.text-muted {
  color: var(--gray-500);
}

.text-white {
  color: var(--white);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 14px 24px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--gradient-secondary);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: var(--white);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1.125rem;
}

/* ========================================
   Form Elements
   ======================================== */

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--gray-700);
  font-size: 0.95rem;
}

.form-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: all var(--transition-base);
  background: var(--white);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-input::placeholder {
  color: var(--gray-400);
}

.form-input.is-invalid {
  border-color: var(--error);
  background-color: #fff5f5;
}

.form-input.is-invalid:focus {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(244, 67, 54, 0.1);
}

.input-icon {
  position: relative;
}

.input-icon input {
  padding-left: 48px;
}

.input-icon .icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  font-size: 1.25rem;
}

/* ========================================
   Cards
   ======================================== */

.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition-base);
  margin-bottom: var(--spacing-md);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card-header {
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.card-subtitle {
  color: var(--gray-500);
  font-size: 0.9rem;
}

.card-body {
  margin-bottom: var(--spacing-md);
}

.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--gray-100);
}

/* Course Card */
.course-card {
  position: relative;
  overflow: hidden;
}

.course-thumbnail {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.course-badge {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  background: var(--gradient-accent);
  color: var(--white);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.course-meta {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.course-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.course-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.course-price-old {
  font-size: 1rem;
  color: var(--gray-400);
  text-decoration: line-through;
  margin-left: var(--spacing-sm);
}

/* ========================================
   Category Pills
   ======================================== */

.category-pills {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 12px 0;
  margin-bottom: var(--spacing-lg);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE and Edge */
}

.category-pills::-webkit-scrollbar {
  display: none; /* Chrome, Safari, Opera */
}

.category-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  color: var(--gray-700);
  flex-shrink: 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.category-pill:hover {
  background: var(--gray-50);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 102, 204, 0.15);
}

.category-pill.active {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.category-pill:active {
  transform: translateY(0) scale(0.98);
}

.category-pill i {
  font-size: 1rem;
  transition: all 0.3s ease;
}

.category-pill.active i {
  color: var(--white);
  transform: scale(1.1);
}

.category-pill:not(.active) i {
  color: var(--gray-500);
}

.category-pill:hover:not(.active) i {
  color: var(--primary);
  transform: scale(1.1);
}

/* Mobile optimizations for filter pills */
@media (max-width: 480px) {
  .category-pills {
    gap: 8px;
    padding: 10px 0;
  }

  .category-pill {
    padding: 10px 16px;
    font-size: 0.85rem;
    gap: 6px;
  }
  
  .category-pill i {
    font-size: 0.9rem;
  }
}

@media (max-width: 360px) {
  .category-pill {
    padding: 8px 14px;
    font-size: 0.8rem;
    gap: 5px;
  }
  
  .category-pill i {
    font-size: 0.85rem;
  }
}

/* ========================================
   Bottom Navigation
   ======================================== */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  max-width: 428px;
  width: 100%;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-around;
  padding: 8px 16px 12px;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
  z-index: 1000;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--gray-500);
  text-decoration: none;
  font-size: 0.7rem;
  font-weight: 600;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  position: relative;
  min-width: 64px;
}

.nav-item:hover {
  background: var(--gray-50);
}

.nav-item.active {
  color: var(--primary);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 3px;
  background: var(--primary);
  border-radius: 0 0 3px 3px;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    transform: translateX(-50%) translateY(-8px);
    opacity: 0;
  }
  to {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
  }
}

.nav-item i {
  font-size: 1.7rem;
  transition: all 0.3s ease;
}

.nav-item .icon {
  font-size: 1.7rem;
  transition: all 0.3s ease;
}

.nav-item.active .icon {
  transform: scale(1.1);
}

.nav-item span {
  letter-spacing: 0.3px;
  transition: all 0.3s ease;
}

.nav-item.active span {
  font-weight: 700;
}

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

/* Mobile optimization */
@media (max-width: 360px) {
  .bottom-nav {
    padding: 6px 8px 10px;
  }
  
  .nav-item {
    padding: 6px 8px;
    min-width: 56px;
    font-size: 0.65rem;
  }
  
  .nav-item i {
    font-size: 1.5rem;
  }
  
  .nav-item .icon {
    font-size: 1.5rem;
  }
}

/* ========================================
   Badge & Tags
   ======================================== */

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-primary {
  background: var(--primary);
  color: var(--white);
}

.badge-success {
  background: var(--success);
  color: var(--white);
}

.badge-warning {
  background: var(--warning);
  color: var(--gray-900);
}

.badge-info {
  background: var(--info);
  color: var(--white);
}

/* ========================================
   Progress Bar
   ======================================== */

.progress {
  width: 100%;
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

/* ========================================
   Avatar
   ======================================== */

.avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 3px solid var(--white);
  box-shadow: var(--shadow-md);
}

.avatar-lg {
  width: 80px;
  height: 80px;
}

.avatar-sm {
  width: 32px;
  height: 32px;
}

/* ========================================
   Stats Grid
   ======================================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.stat-card {
  background: var(--gradient-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray-600);
}

/* ========================================
   Search Bar
   ======================================== */

.search-bar {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.search-input {
  width: 100%;
  padding: 14px 48px 14px 48px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-size: 1rem;
  transition: all var(--transition-base);
  background: var(--white);
  color: var(--gray-900);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.search-input::placeholder {
  color: var(--gray-400);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  font-size: 1.25rem;
}

/* Search bar in page-header */
.page-header .search-input {
  background: var(--white);
  color: var(--gray-900);
  border-color: rgba(255, 255, 255, 0.3);
}

.page-header .search-input::placeholder {
  color: var(--gray-400);
}

.page-header .search-icon {
  color: var(--gray-400);
}

/* ========================================
   Utilities
   ======================================== */

.mt-0 {
  margin-top: 0;
}

.mt-1 {
  margin-top: var(--spacing-xs);
}

.mt-2 {
  margin-top: var(--spacing-sm);
}

.mt-3 {
  margin-top: var(--spacing-md);
}

.mt-4 {
  margin-top: var(--spacing-lg);
}

.mb-0 {
  margin-bottom: 0;
}

.mb-1 {
  margin-bottom: var(--spacing-xs);
}

.mb-2 {
  margin-bottom: var(--spacing-sm);
}

.mb-3 {
  margin-bottom: var(--spacing-md);
}

.mb-4 {
  margin-bottom: var(--spacing-lg);
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.d-flex {
  display: flex;
}

.align-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.gap-1 {
  gap: var(--spacing-sm);
}

.gap-2 {
  gap: var(--spacing-md);
}

/* ========================================
   Animations
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-base) ease-out;
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
  }

  to {
    transform: translateY(0);
  }
}

.slide-up {
  animation: slideUp var(--transition-slow) ease-out;
}

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 428px) {
  .container {
    max-width: 100%;
  }
}