/**
 * Main CSS for HCMUTE Youth Festival - Static Router Version
 */

:root {
  /* Dark Festival Color Palette - Modern & Vibrant */
  --primary-color: #6366f1;        /* Indigo - Modern, tech-savvy */
  --secondary-color: #8b5cf6;      /* Purple - Creative, innovative */
  --accent-color: #3b82f6;         /* Blue - Modern, tech-savvy */
  --success-color: #10b981;        /* Emerald - Success, growth */
  --danger-color: #ef4444;         /* Red - Alert, warning */
  --warning-color: #f59e0b;        /* Amber - Warmth, enthusiasm */
  --info-color: #06b6d4;           /* Cyan - Information, tech */
  
  /* Dark Mode Backgrounds */
  --bg-dark: #0f172a;             /* Very dark slate for main background */
  --bg-medium: #1e293b;           /* Slightly lighter dark for sections/cards */
  --bg-light: #334155;            /* Even lighter dark for subtle elements */
  
  /* Text Colors */
  --text-color: #e0e0e0;          /* Light grey for main text */
  --text-light: #f8fafc;          /* White for headings/important text */
  --text-muted: #a0a0b0;          /* Muted grey for secondary text */
  
  /* Borders */
  --border-color: rgba(255, 255, 255, 0.1); /* Subtle light border on dark */
  
  /* Dark Festival Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --gradient-secondary: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a8a 50%, #3b82f6 100%);
  --gradient-card: linear-gradient(135deg, #1e293b 0%, #1e3a8a 100%);
  --gradient-activity: linear-gradient(135deg, #10b981 0%, #34d399 100%);
  --gradient-event: linear-gradient(135deg, #8b5cf6 0%, #3b82f6 100%);
  
  /* Enhanced Shadows for Dark Mode */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.5);
  --shadow-glow-blue: 0 0 20px rgba(59, 130, 246, 0.5);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Image responsive */
.img-fluid {
  max-width: 100%;
  height: auto;
}

body {
  font-family: 'Inter', 'Public Sans', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

/* App Container */
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header Styles */
.main-header {
  background: var(--bg-dark);
  color: var(--text-light);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
  border-bottom: 1px solid var(--border-color);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  transition: all 0.3s ease;
}

.nav-links a:hover, .nav-links a.active {
  background: var(--bg-light);
  color: var(--accent-color);
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Page Transitions */
.page-enter {
  opacity: 0;
  transform: translateY(20px);
}

.page-enter-active {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Loading States */
.loading {
  text-align: center;
  padding: 4rem;
  color: var(--text-muted);
}

.loading-spinner {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--accent-color);
  animation: spin 1s ease-in-out infinite;
}

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

/* Error States */
.error-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.error-state i {
  font-size: 4rem;
  margin-bottom: 1rem;
  color: var(--danger-color);
}

.error-state h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-light);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
}

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

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

.btn-secondary {
  background: var(--bg-medium);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-light);
  color: var(--accent-color);
}

.btn-success {
  background: var(--gradient-activity);
  color: white;
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), var(--shadow-glow-blue);
}

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

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-2px);
}

/* Cards */
.card {
  background: var(--gradient-card);
  border-radius: 20px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
}

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

.card-header {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

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

/* Grid Layouts */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-light);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--bg-dark);
  color: var(--text-color);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
}

.pagination-btn {
  padding: 0.5rem 1rem;
  background: var(--bg-medium);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.pagination-btn:hover {
  background: var(--bg-light);
  color: var(--accent-color);
}

.pagination-btn.active {
  background: var(--gradient-primary);
  color: white;
  border-color: var(--primary-color);
}

.pagination-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

.hidden { display: none; }
.visible { display: block; }

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .container {
    padding: 0 0.5rem;
  }
}

/* Animation Classes */
.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-up {
  animation: slideUp 0.6s ease-out;
}

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Route-specific styles */
[data-route] {
  cursor: pointer;
}

/* Loading overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-overlay .loading-spinner {
  width: 60px;
  height: 60px;
  border-width: 4px;
}