/* ═══════════════════════════════════════════════════════════
   XEM VẬN HẠN TẾT 2026 - CSS Design System
   Theme: Tết Vui Hiện Đại
═══════════════════════════════════════════════════════════ */

/* ─────────────────────────────────────────────────────────
   CSS VARIABLES
───────────────────────────────────────────────────────── */
:root {
  /* Primary Colors */
  --tet-red: #E63946;
  --tet-red-dark: #C0392B;
  --gold: #FFD700;
  --gold-light: #FFF3CD;
  --peach-pink: #FFB7C5;
  
  /* Background */
  --bg-gradient-start: #FEE2E2;
  --bg-gradient-mid: #FECACA;
  --bg-gradient-end: #FCA5A5;
  
  /* Text */
  --text-primary: #1F1F1F;
  --text-secondary: #666666;
  --text-light: #FFFFFF;
  
  /* Accents */
  --green-lucky: #10B981;
  --purple-mystic: #8B5CF6;
  --blue-calm: #3498DB;
  --orange-warm: #E67E22;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
  --shadow-glow: 0 0 20px rgba(230, 57, 70, 0.4);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ─────────────────────────────────────────────────────────
   RESET & BASE
───────────────────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─────────────────────────────────────────────────────────
   TYPOGRAPHY
───────────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: clamp(2rem, 8vw, 3rem); }
h2 { font-size: clamp(1.5rem, 5vw, 2rem); }
h3 { font-size: clamp(1.25rem, 4vw, 1.5rem); }

.text-gradient {
  background: linear-gradient(135deg, var(--tet-red), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─────────────────────────────────────────────────────────
   LAYOUT
───────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.screen {
  min-height: 100vh;
  padding: var(--space-xl) 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hidden { display: none !important; }

/* ─────────────────────────────────────────────────────────
   CARDS
───────────────────────────────────────────────────────── */
.card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}

.card-glow {
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

/* ─────────────────────────────────────────────────────────
   BUTTONS
───────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border: none;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn:active {
  transform: scale(0.95);
}

.btn-primary {
  background: linear-gradient(135deg, var(--tet-red), var(--tet-red-dark));
  color: var(--text-light);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.9);
  color: var(--tet-red);
  border: 2px solid var(--tet-red);
}

.btn-gold {
  background: linear-gradient(135deg, var(--gold), #FFA500);
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
}

.btn-lg {
  padding: var(--space-lg) var(--space-xl);
  font-size: 1.125rem;
}

.btn-block {
  width: 100%;
}

.btn-icon {
  width: 50px;
  height: 50px;
  padding: 0;
  font-size: 1.5rem;
}

/* ─────────────────────────────────────────────────────────
   FORM ELEMENTS
───────────────────────────────────────────────────────── */
.select-wrapper {
  position: relative;
  width: 100%;
}

.select-wrapper::after {
  content: '▼';
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-secondary);
}

select {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  padding-right: var(--space-2xl);
  font-size: 1.125rem;
  border: 2px solid rgba(230, 57, 70, 0.3);
  border-radius: var(--radius-md);
  background: white;
  color: var(--text-primary);
  cursor: pointer;
  appearance: none;
  transition: border-color var(--transition-fast);
}

select:focus {
  outline: none;
  border-color: var(--tet-red);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.2);
}

/* ─────────────────────────────────────────────────────────
   ZODIAC & FORTUNE CARD
───────────────────────────────────────────────────────── */
.zodiac-icon {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  animation: bounce 2s infinite;
}

.fortune-category {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(0,0,0,0.1);
}

.fortune-category:last-child {
  border-bottom: none;
}

.stars {
  display: flex;
  gap: 2px;
}

.star {
  color: #DDD;
  font-size: 1.25rem;
  transition: color var(--transition-fast);
}

.star.filled {
  color: var(--gold);
}

/* ─────────────────────────────────────────────────────────
   GAME CARDS
───────────────────────────────────────────────────────── */
.game-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin: var(--space-lg) 0;
}

.game-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

.game-card:hover {
  border-color: var(--tet-red);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.game-card .icon {
  font-size: 2rem;
  margin-bottom: var(--space-xs);
}

.game-card .label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ─────────────────────────────────────────────────────────
   LUCKY WHEEL
───────────────────────────────────────────────────────── */
.wheel-container {
  position: relative;
  width: 280px;
  height: 280px;
  margin: var(--space-lg) auto;
}

.wheel {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  transition: transform 4s cubic-bezier(0.2, 0.8, 0.3, 1);
  box-shadow: var(--shadow-lg), inset 0 0 30px rgba(0,0,0,0.1);
}

.wheel-pointer {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 2rem;
  z-index: 10;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.wheel-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--gold), #FFA500);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  z-index: 5;
}

/* ─────────────────────────────────────────────────────────
   MODAL
───────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  padding: var(--space-md);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  max-width: 400px;
  width: 100%;
  text-align: center;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-icon {
  font-size: 4rem;
  margin-bottom: var(--space-md);
}

/* ─────────────────────────────────────────────────────────
   SHARE BUTTONS
───────────────────────────────────────────────────────── */
.share-grid {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin-top: var(--space-lg);
}

.share-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.share-btn:hover {
  transform: scale(1.1);
}

.share-btn.facebook { background: #1877F2; color: white; }
.share-btn.zalo { background: #0068FF; color: white; }
.share-btn.download { background: var(--green-lucky); color: white; }

/* ─────────────────────────────────────────────────────────
   ANIMATIONS
───────────────────────────────────────────────────────── */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes shake {
  0%, 100% { transform: rotate(0); }
  25% { transform: rotate(-15deg); }
  75% { transform: rotate(15deg); }
}

@keyframes confetti {
  0% { transform: translateY(0) rotate(0); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  33% { transform: translateY(-15px) rotate(-5deg); }
  66% { transform: translateY(5px) rotate(5deg); }
}

.animate-fadeIn {
  animation: fadeIn 0.5s ease forwards;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

.animate-shake {
  animation: shake 0.5s ease;
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

/* ─────────────────────────────────────────────────────────
   DECORATIONS
───────────────────────────────────────────────────────── */
.flower {
  position: fixed;
  font-size: 1.5rem;
  opacity: 0.7;
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
}

.flower:nth-child(1) { top: 10%; left: 5%; animation-delay: 0s; }
.flower:nth-child(2) { top: 20%; right: 8%; animation-delay: 1s; }
.flower:nth-child(3) { top: 60%; left: 3%; animation-delay: 2s; }
.flower:nth-child(4) { top: 80%; right: 5%; animation-delay: 3s; }
.flower:nth-child(5) { top: 40%; left: 8%; animation-delay: 4s; }

/* ─────────────────────────────────────────────────────────
   DISCLAIMER
───────────────────────────────────────────────────────── */
.disclaimer {
  margin-top: var(--space-xl);
  padding: var(--space-md);
  background: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
}

.disclaimer strong {
  color: var(--tet-red);
}

/* ─────────────────────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────────────────────── */
@media (max-width: 375px) {
  .game-grid {
    gap: var(--space-sm);
  }
  
  .wheel-container {
    width: 240px;
    height: 240px;
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 480px;
  }
}