/* Mobile-First Design System */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
  /* Colors */
  --primary: #667eea;
  --secondary: #764ba2;
  --bg-dark: #1a1a2e;
  --bg-darker: #16213e;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-hover: rgba(255, 255, 255, 0.08);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-tertiary: rgba(255, 255, 255, 0.5);
  --border: rgba(255, 255, 255, 0.1);
  --error: #ff6b6b;
  --success: #51cf66;

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

  /* Sizing */
  --touch-target: 44px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --max-width: 1200px;

  /* Typography */
  --font-base: 16px;
  --font-sm: 14px;
  --font-lg: 18px;
  --font-xl: 24px;
  --font-2xl: 32px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Z-index */
  --z-nav: 1000;
  --z-overlay: 999;
  --z-modal: 1001;
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  /* Prevents mobile zoom */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: 800px;
  /* Reduced from 1200px for narrower cards on desktop */
  margin: 0 auto;
  padding: var(--spacing-md);
}

.mobile-stack {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* Desktop: 2-column */
@media (min-width: 1024px) {
  .desktop-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }
}

/* ============================================
   COMPONENTS - BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  min-height: var(--touch-target);
  padding: 0 var(--spacing-lg);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-base);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  text-decoration: none;
}

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

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--surface-hover);
}

.btn-full {
  width: 100%;
}

/* ============================================
   COMPONENTS - CARDS
   ============================================ */
.card {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  border: 1px solid var(--border);
}

.card-title {
  font-size: var(--font-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

/* Horizontal scroll cards */
.card-scroll {
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-bottom: var(--spacing-sm);
}

.card-scroll::-webkit-scrollbar {
  display: none;
}

.card-scroll-item {
  flex: 0 0 280px;
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  border: 1px solid var(--border);
}

/* ============================================
   COMPONENTS - FORMS
   ============================================ */
.form-group {
  margin-bottom: var(--spacing-lg);
}

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

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  min-height: var(--touch-target);
  padding: var(--spacing-md);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--font-base);
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-textarea {
  min-height: 200px;
  resize: vertical;
}

/* Search input */
.search-input {
  padding-left: 48px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%23667eea' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 16px center;
}

/* ============================================
   COMPONENTS - LOADING
   ============================================ */
.loading {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-tertiary);
}

.skeleton {
  background: linear-gradient(90deg,
      var(--surface) 0%,
      var(--surface-hover) 50%,
      var(--surface) 100%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }

  100% {
    background-position: -200% 0;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden {
  display: none !important;
}

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

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

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

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

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

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

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

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

/* Sticky footer button */
.sticky-footer {
  position: sticky;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
}

/* Safe area for mobile notches */
@supports (padding: env(safe-area-inset-bottom)) {
  .sticky-footer {
    padding-bottom: calc(var(--spacing-md) + env(safe-area-inset-bottom));
  }
}