:root {
  /* Modern OKLCH Colors */
  --bg-color: oklch(15% 0.02 260);
  --text-primary: oklch(98% 0.01 260);
  --text-secondary: oklch(85% 0.02 260);
  
  /* Game 1: Hero's Adventure (Gold/Red) */
  --hero-gradient: linear-gradient(135deg, oklch(75% 0.18 70), oklch(60% 0.2 40));
  --hero-glow: oklch(70% 0.2 60 / 40%);
  
  /* Game 2: SSS-Class Challenge (Purple/Blue) */
  --sss-gradient: linear-gradient(135deg, oklch(65% 0.25 300), oklch(55% 0.25 260));
  --sss-glow: oklch(60% 0.25 280 / 40%);

  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  --font-main: 'Inter', 'Noto Sans KR', sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  /* Subtle Noise Texture */
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter 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");
  background-blend-mode: overlay;
  background-attachment: fixed;
}

/* Navigation Styles */
.main-nav {
  width: 100%;
  padding: 20px;
  display: flex;
  justify-content: center;
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--glass-border);
}

.nav-links {
  display: flex;
  gap: 30px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 700;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.app-container {
  max-width: 1000px;
  width: 90%;
  padding: 80px 20px;
  text-align: center;
  flex: 1;
}

/* Footer Styles */
.main-footer {
  width: 100%;
  padding: 60px 20px;
  background: rgba(0, 0, 0, 0.3);
  border-top: 1px solid var(--glass-border);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
}

.footer-links a:hover {
  text-decoration: underline;
}

.copyright {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
}

/* Content Page Styles */
.content-wrapper {
  text-align: left;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 40px;
  line-height: 1.8;
}

.content-wrapper h1 {
  margin-bottom: 30px;
  background: var(--hero-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.content-wrapper h2 {
  margin-top: 40px;
  margin-bottom: 20px;
}

.content-wrapper p {
  margin-bottom: 20px;
  color: var(--text-secondary);
}

.hero-section {
  margin-bottom: 60px;
}

.main-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.main-title span {
  background: var(--sss-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.2rem;
  font-weight: 400;
}

.game-selection {
  display: grid;
  gap: 40px;
}

.game-group {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 30px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.game-title {
  font-size: 1.5rem;
  margin-bottom: 25px;
  text-align: left;
  border-left: 4px solid white;
  padding-left: 15px;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.game-btn {
  position: relative;
  height: 80px;
  border: none;
  border-radius: 16px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
  text-decoration: none;
}

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

.btn-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: white;
  z-index: 2;
}

.btn-tag {
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
  background: rgba(0, 0, 0, 0.2);
  padding: 4px 8px;
  border-radius: 6px;
  margin-top: 4px;
  z-index: 2;
  color: rgba(255, 255, 255, 0.8);
}

.btn-tag.mobile {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

/* Specific Button Styles */
.hero-pc, .hero-mobile {
  background: var(--hero-gradient);
  box-shadow: 0 10px 20px -5px var(--hero-glow);
}

.hero-pc:hover, .hero-mobile:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px -5px var(--hero-glow);
}

.sss-pc, .sss-mobile {
  background: var(--sss-gradient);
  box-shadow: 0 10px 20px -5px var(--sss-glow);
}

.sss-pc:hover, .sss-mobile:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px -5px var(--sss-glow);
}

/* Glass Shine Effect on Hover */
.game-btn::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transform: rotate(45deg);
  transition: 0.5s;
  pointer-events: none;
}

.game-btn:hover::after {
  left: 100%;
}

/* Responsive adjustments */
@media (max-width: 600px) {
  .app-container {
    padding: 20px 10px;
  }
  .button-grid {
    grid-template-columns: 1fr;
  }
}