/* Global Theme & Design System */
:root {
  /* Color Palette - Modern Blue Theme */
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --primary-light: #e0f2fe;
  
  --secondary: #64748b;
  --secondary-hover: #475569;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  /* Backgrounds */
  --bg-body: #f1f5f9;
  --bg-card: #ffffff;
  --bg-input: #f8fafc;
  
  /* Text */
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  /* Borders */
  --border-color: #e2e8f0;
  --border-focus: #38bdf8;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --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);
  
  /* Transitions */
  --transition-base: all 0.2s ease-in-out;
}

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

body {
  font-family: "Inter", "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-base);
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-muted);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-auto-fit { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* Components */

/* Cards */
.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  transition: var(--transition-base);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition-base);
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: white;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 6px 16px rgba(14, 165, 233, 0.35);
  transform: translateY(-1px);
}

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

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

.btn-danger {
  background-color: #fee2e2;
  color: var(--danger);
}

.btn-danger:hover {
  background-color: #fecaca;
}

.btn-ghost {
  background-color: transparent;
  color: var(--primary);
}

.btn-ghost:hover {
  background-color: var(--primary-light);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: var(--text-main);
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-input);
  font-size: 1rem;
  color: var(--text-main);
  transition: var(--transition-base);
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
  background-color: white;
}

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

/* Badges/Chips */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
}

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

.badge-success {
  background-color: #d1fae5;
  color: var(--success);
}

.badge-warning {
  background-color: #fef3c7;
  color: var(--warning);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

/* Header/Navbar */
.navbar {
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--spacing-md) 0;
}

.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 1.25rem;
}

.nav-brand img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-weight: 500;
  color: var(--text-muted);
  position: relative;
}

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

/* Responsive */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 16px;
    --spacing-xl: 24px;
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  
  .grid-cols-3 { grid-template-columns: 1fr; }
  .grid-cols-2 { grid-template-columns: 1fr; }
  
  .navbar-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .nav-links {
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
  }
}