/* ====================================
   VÒNG QUAY MAY MẮN - Design System
   Luxury Gold + Dark Navy Theme
   ==================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700;800;900&family=Inter:wght@400;500;600;700&display=swap');

/* ====== CSS Variables ====== */
:root {
  /* Primary Colors */
  --color-bg-dark: #060a1a;
  --color-bg-navy: #0a0e27;
  --color-bg-navy-light: #1a1f3d;
  --color-bg-card: rgba(20, 25, 55, 0.85);
  
  /* Gold Accent */
  --color-gold: #d4a843;
  --color-gold-light: #f5d576;
  --color-gold-dark: #a07830;
  --color-gold-glow: rgba(245, 213, 118, 0.3);
  --color-gold-gradient: linear-gradient(135deg, #d4a843, #f5d576, #d4a843);
  
  /* Wheel Segment Colors */
  --color-red: #c42e4a;
  --color-orange: #d47a2e;
  --color-green: #2e8b4a;
  --color-purple: #5a2e8b;
  --color-blue: #2e4a8b;
  --color-yellow: #c4a82e;
  
  /* Text */
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-gold: #f5d576;
  
  /* Misc */
  --color-overlay: rgba(6, 10, 26, 0.85);
  --color-success: #2ecc71;
  --color-danger: #e74c3c;
  
  /* Typography */
  --font-display: 'Be Vietnam Pro', sans-serif;
  --font-body: 'Inter', 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: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 50%;
  
  /* Shadows */
  --shadow-gold: 0 0 20px rgba(212, 168, 67, 0.3), 0 0 60px rgba(212, 168, 67, 0.1);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-button: 0 4px 15px rgba(212, 168, 67, 0.4);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ====== Reset ====== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-dark);
  color: var(--color-text-primary);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  user-select: none;
  -webkit-user-select: none;
}

/* ====== Background Effects ====== */
.bg-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  overflow: hidden;
  background: radial-gradient(ellipse at center bottom, var(--color-bg-navy-light) 0%, var(--color-bg-navy) 40%, var(--color-bg-dark) 100%);
}

.bg-stars {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(2px 2px at 20px 30px, rgba(255,255,255,0.3), transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.2), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.2), transparent),
    radial-gradient(2px 2px at 160px 30px, rgba(255,255,255,0.3), transparent);
  background-size: 200px 100px;
  animation: twinkle 4s ease-in-out infinite alternate;
}

@keyframes twinkle {
  0% { opacity: 0.5; }
  100% { opacity: 1; }
}

/* Gold particles floating */
.bg-particles {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--color-gold-light);
  border-radius: var(--radius-full);
  opacity: 0;
  animation: floatParticle 6s ease-in-out infinite;
}

.particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 5s; }
.particle:nth-child(2) { left: 20%; animation-delay: 1s; animation-duration: 7s; }
.particle:nth-child(3) { left: 30%; animation-delay: 2s; animation-duration: 6s; }
.particle:nth-child(4) { left: 50%; animation-delay: 0.5s; animation-duration: 8s; }
.particle:nth-child(5) { left: 60%; animation-delay: 3s; animation-duration: 5.5s; }
.particle:nth-child(6) { left: 75%; animation-delay: 1.5s; animation-duration: 7s; }
.particle:nth-child(7) { left: 85%; animation-delay: 2.5s; animation-duration: 6.5s; }
.particle:nth-child(8) { left: 90%; animation-delay: 0.8s; animation-duration: 5s; }

@keyframes floatParticle {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 0.8;
  }
  90% {
    opacity: 0.3;
  }
  100% {
    transform: translateY(-10vh) scale(1);
    opacity: 0;
  }
}

/* Vignette overlay */
.bg-vignette {
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at center, transparent 40%, rgba(0,0,0,0.6) 100%);
  pointer-events: none;
}

/* ====== Typography ====== */
.text-gold {
  color: var(--color-text-gold);
  text-shadow: 0 0 10px rgba(245, 213, 118, 0.3);
}

.text-gold-shine {
  background: linear-gradient(135deg, #d4a843 0%, #f5d576 40%, #fff 50%, #f5d576 60%, #d4a843 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: goldShine 3s linear infinite;
}

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

.heading-display {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* ====== Buttons ====== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-gold {
  background: linear-gradient(135deg, #d4a843, #f5d576);
  color: #1a1f3d;
  box-shadow: var(--shadow-button);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(212, 168, 67, 0.5);
}

.btn-gold:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(212, 168, 67, 0.3);
}

.btn-gold::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(transparent, rgba(255,255,255,0.2), transparent);
  transform: rotate(45deg);
  transition: 0.5s;
  opacity: 0;
}

.btn-gold:hover::after {
  opacity: 1;
  transform: rotate(45deg) translate(50%, 50%);
}

.btn-large {
  padding: 18px 48px;
  font-size: 1.3rem;
  border-radius: var(--radius-lg);
}

.btn-pulse {
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: var(--shadow-button);
  }
  50% {
    box-shadow: 0 0 30px rgba(212, 168, 67, 0.6), 0 0 60px rgba(212, 168, 67, 0.3);
  }
}

/* ====== Modal / Overlay ====== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

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

.modal-content {
  background: linear-gradient(145deg, rgba(26, 31, 61, 0.95), rgba(10, 14, 39, 0.95));
  border: 1px solid rgba(212, 168, 67, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  width: 90%;
  max-width: 400px;
  box-shadow: var(--shadow-gold);
  transform: scale(0.9) translateY(20px);
  transition: all var(--transition-normal);
}

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

/* ====== Input Fields ====== */
.input-field {
  width: 100%;
  padding: 16px 20px;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  text-align: center;
  letter-spacing: 3px;
  color: var(--color-text-gold);
  background: rgba(10, 14, 39, 0.8);
  border: 2px solid rgba(212, 168, 67, 0.4);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-normal);
}

.input-field:focus {
  border-color: var(--color-gold);
  box-shadow: 0 0 20px rgba(212, 168, 67, 0.2);
}

.input-field::placeholder {
  color: rgba(245, 213, 118, 0.3);
  letter-spacing: 1px;
  font-size: 1rem;
}

/* ====== Numpad ====== */
.numpad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: var(--spacing-md);
}

.numpad-btn {
  padding: 16px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  background: rgba(26, 31, 61, 0.8);
  border: 1px solid rgba(212, 168, 67, 0.2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.numpad-btn:hover,
.numpad-btn:active {
  background: rgba(212, 168, 67, 0.2);
  border-color: var(--color-gold);
  color: var(--color-text-gold);
}

.numpad-btn.delete {
  color: var(--color-danger);
  font-size: 1.2rem;
}

.numpad-btn.confirm {
  background: linear-gradient(135deg, #d4a843, #f5d576);
  color: #1a1f3d;
  font-size: 1rem;
  font-weight: 800;
}

/* ====== Screen Transitions ====== */
.screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.screen.active {
  opacity: 1;
  visibility: visible;
}

/* ====== Result Screen ====== */
.result-container {
  text-align: center;
  z-index: 50;
}

.result-prize-name {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 900;
  margin: var(--spacing-lg) 0;
  text-shadow: 0 0 30px rgba(245, 213, 118, 0.5);
}

.result-congratulations {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  text-transform: uppercase;
  letter-spacing: 3px;
}

/* ====== Notification ====== */
.notification {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.9);
  background: linear-gradient(145deg, rgba(26, 31, 61, 0.98), rgba(10, 14, 39, 0.98));
  border: 2px solid var(--color-gold);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-2xl);
  text-align: center;
  z-index: 200;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-gold);
}

.notification.active {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
}

.notification-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.notification-text {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-gold);
}

/* ====== Scrollbar ====== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-navy);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gold-dark);
  border-radius: 3px;
}

/* ====== Utilities ====== */
.hidden { display: none !important; }
.invisible { visibility: hidden; opacity: 0; }
.text-center { text-align: center; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ====== Loading ====== */
.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(212, 168, 67, 0.2);
  border-top-color: var(--color-gold);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

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