:root {
  /* Modern OKLCH color palette - vibrant yet sophisticated */
  --primary: oklch(0.65 0.24 265);
  --primary-glow: oklch(0.65 0.24 265 / 0.3);
  --secondary: oklch(0.75 0.18 320);
  --accent: oklch(0.85 0.12 180);
  --bg: oklch(0.99 0.005 260);
  --text: oklch(0.15 0.02 260);
  --text-dim: oklch(0.45 0.02 260);
  
  --card-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.4);
  --deep-shadow: 
    0 4px 6px -1px oklch(0.2 0.02 260 / 0.05),
    0 10px 15px -3px oklch(0.2 0.02 260 / 0.1),
    0 20px 25px -5px oklch(0.2 0.02 260 / 0.05);
  
  --font-main: 'Pretendard', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg);
  /* Premium textured background with sunset gradients */
  background-image: 
    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3%3Ffilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E"),
    radial-gradient(at 0% 0%, oklch(0.9 0.06 300) 0px, transparent 50%),
    radial-gradient(at 100% 100%, oklch(0.9 0.08 20) 0px, transparent 50%);
  background-blend-mode: overlay, normal, normal;
  color: var(--text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-x: hidden;
}

#app {
  width: 100%;
  max-width: 1100px;
  padding: 2rem;
  perspective: 1000px;
}

/* Glassmorphism Container */
.glass {
  background: var(--card-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-radius: 32px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--deep-shadow);
  padding: 3.5rem;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

h1 {
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 2rem;
  text-align: center;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.05));
}

/* Uploader Styles */
.uploader-area {
  background: rgba(255, 255, 255, 0.3);
  border: 2px dashed oklch(0.8 0.05 260);
  border-radius: 24px;
  padding: 4rem 2rem;
  text-align: center;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  margin-bottom: 2.5rem;
  position: relative;
  overflow: hidden;
}

.uploader-area::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary-glow), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}

.uploader-area:hover {
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.5);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.05);
}

.uploader-area:hover::before {
  opacity: 1;
}

.uploader-area p {
  position: relative;
  z-index: 1;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-dim);
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 1.2rem;
  margin-top: 2rem;
}

.preview-item {
  aspect-ratio: 1;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 16px rgba(0,0,0,0.08);
  border: 2px solid white;
  transition: transform 0.3s;
}

.preview-item:hover {
  transform: scale(1.05) rotate(2deg);
}

.preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Button Styles */
button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 1.2rem 3rem;
  border-radius: 20px;
  font-weight: 700;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: block;
  margin: 2rem auto 0;
  box-shadow: 0 8px 20px var(--primary-glow);
  position: relative;
  overflow: hidden;
}

button:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 15px 30px var(--primary-glow);
  background: oklch(0.68 0.24 265);
}

button:active {
  transform: translateY(0) scale(0.98);
}

/* Tournament Arena Styles */
.arena {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
  width: 100%;
}

.round-info {
  background: white;
  padding: 0.6rem 1.5rem;
  border-radius: 100px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pair-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  width: 100%;
  position: relative;
}

.image-card {
  position: relative;
  aspect-ratio: 3/4;
  border-radius: 32px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
  background: oklch(0.9 0.01 260);
  border: 4px solid white;
  box-shadow: var(--deep-shadow);
}

.image-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.image-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 30px 60px rgba(0,0,0,0.2);
  z-index: 5;
}

.image-card:hover img {
  transform: scale(1.1);
}

.image-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.6));
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1;
}

.image-card:hover::before {
  opacity: 1;
}

.image-card::after {
  content: '선택하기';
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: white;
  color: var(--text);
  padding: 0.8rem 2rem;
  border-radius: 100px;
  font-weight: 800;
  font-size: 1.1rem;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 2;
  white-space: nowrap;
}

.image-card:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.vs-badge {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  width: 80px;
  height: 80px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 900;
  font-size: 1.8rem;
  z-index: 10;
  box-shadow: 0 10px 25px var(--primary-glow);
  color: white;
  border: 6px solid var(--bg);
}

/* Winner Styles */
.winner-section {
  text-align: center;
  animation: fadeIn 0.8s ease-out;
}

.winner-card {
  width: min(400px, 90%);
  margin: 3rem auto;
  border-radius: 40px;
  overflow: hidden;
  box-shadow: 0 40px 100px rgba(0,0,0,0.3);
  border: 8px solid white;
  position: relative;
}

.winner-card img {
  width: 100%;
  display: block;
}

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

.final-battle-alert {
  position: fixed;
  inset: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0,0,0,0.8);
  z-index: 1000;
  animation: alertFade 2s forwards;
  pointer-events: none;
}

.final-battle-alert h1 {
  font-size: 8vw;
  color: var(--accent);
  text-shadow: 0 0 30px var(--accent);
  animation: scaleUp 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  -webkit-text-fill-color: initial;
  background: none;
}

@keyframes alertFade {
  0% { opacity: 0; }
  20% { opacity: 1; }
  80% { opacity: 1; }
  100% { opacity: 0; }
}

@keyframes scaleUp {
  from { transform: scale(0.5); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* Revival Mode Styles */
.revival-mode {
  background: rgba(30, 0, 0, 0.7);
  border-color: oklch(0.6 0.25 20 / 0.5);
  box-shadow: 0 0 50px oklch(0.6 0.25 20 / 0.3);
}

.revival-text {
  background: linear-gradient(135deg, oklch(0.6 0.25 20), oklch(0.8 0.18 70));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); filter: brightness(1); }
  50% { transform: scale(1.05); filter: brightness(1.2); }
  100% { transform: scale(1); filter: brightness(1); }
}

.revival-intro-section {
  text-align: center;
  padding: 2rem;
}

.revival-intro-section p {
  font-size: 1.3rem;
  margin-bottom: 2rem;
  color: var(--text-dim);
}

.button-group {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

.revival-btn {
  background: linear-gradient(135deg, oklch(0.6 0.25 20), oklch(0.7 0.2 40));
  box-shadow: 0 8px 20px oklch(0.6 0.25 20 / 0.3);
}

.skip-btn {
  background: oklch(0.8 0.02 260);
  color: var(--text);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.skip-btn:hover {
  background: oklch(0.75 0.02 260);
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
}

/* Winner Celebration Glow */
.winner-section h1 {
  animation: rainbow 3s linear infinite;
}

@keyframes rainbow {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
  .pair-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .glass {
    padding: 2rem;
  }
  .vs-badge {
    width: 60px;
    height: 60px;
    font-size: 1.4rem;
    top: 50%;
  }
  h1 {
    font-size: 2.2rem;
  }
}
 {
    font-size: 2.2rem;
  }
}