@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Color Palette - Strict Grayscale */
  --bg-primary: #0e0e11;
  --bg-secondary: #1a1a1f;
  --card-bg: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  
  --accent-primary: #e5e7eb;
  --accent-secondary: #9ca3af;
  --gradient-accent: linear-gradient(135deg, #ffffff, #9ca3af);
  
  --glow-white: rgba(255, 255, 255, 0.15);
  --glow-strong: rgba(255, 255, 255, 0.3);
  
  /* Layout & Spacing */
  --max-width: 1400px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  --space-desktop: 100px;
  --space-tablet: 70px;
  --space-mobile: 50px;
  
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul {
  list-style: none;
}

/* Layout Utilities */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.section-spacing {
  padding: var(--space-desktop) 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.text-gradient {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* Button System */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-accent);
  color: var(--bg-primary);
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(255, 255, 255, 0.05);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--glow-white);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--accent-secondary);
  box-shadow: none;
}

.btn-outline:hover {
  background: var(--card-bg);
  border-color: var(--text-primary);
  box-shadow: 0 0 15px var(--glow-white);
}

/* Glass Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: rgba(14, 14, 17, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  transition: var(--transition);
}

.header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 8px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: var(--transition);
}

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

.nav-link:hover::after {
  width: 100%;
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 1001;
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 80px;
  background: linear-gradient(to bottom, rgba(14, 14, 17, 0.8), #0e0e11), url('images/monochrome-toon-hero-bg.jpg') center/cover no-repeat;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  animation: fadeIn 1s ease-out;
}

.hero-title {
  font-size: 4rem;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.hero-disclaimer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin: 3rem 0;
  padding: 20px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.disclaimer-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-primary);
}

.disclaimer-item svg {
  width: 18px;
  height: 18px;
  fill: var(--text-primary);
}

/* Game Section */
.game-section {
  background: var(--bg-secondary);
  position: relative;
}

.game-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.game-frame {
  width: 90%;
  max-width: 1300px;
  aspect-ratio: 16 / 9;
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 10px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 20px rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
  transition: var(--transition);
}

.game-frame::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  bottom: -1px;
  border-radius: calc(var(--radius-xl) + 1px);
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent, rgba(255,255,255,0.05));
  z-index: -1;
}

.game-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
  border-radius: calc(var(--radius-xl) - 4px);
  background: #000;
  display: block;
}

/* Features / Info Cards */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  border: 1px solid var(--card-border);
}

.feature-icon svg {
  width: 30px;
  height: 30px;
  fill: var(--text-primary);
}

/* Page Headers (Internal Pages) */
.page-header {
  padding: 180px 0 80px;
  text-align: center;
  background: linear-gradient(to bottom, var(--bg-secondary), var(--bg-primary));
  border-bottom: 1px solid var(--card-border);
}

.page-title {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.page-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-desktop) 20px;
}

.content-block {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  margin-bottom: 2rem;
}

.content-block h2 {
  font-size: 1.8rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 0.5rem;
}

.content-block h2:first-child {
  margin-top: 0;
}

.content-block ul {
  list-style: disc;
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.content-block li {
  margin-bottom: 0.5rem;
}

/* Contact Form */
.contact-form {
  display: grid;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 500;
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-secondary);
  box-shadow: 0 0 10px var(--glow-white);
}

textarea.form-control {
  min-height: 150px;
  resize: vertical;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--card-border);
  padding: 80px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.footer-brand p {
  margin-top: 1rem;
  max-width: 400px;
}

.footer-title {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.footer-links a:hover {
  color: var(--text-primary);
  padding-left: 5px;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--card-border);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-rg-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.age-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 2px solid var(--text-primary);
  border-radius: 50%;
  font-size: 14px;
}

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

/* Media Queries */
@media (max-width: 1200px) {
  .game-frame {
    width: 95%;
  }
}

@media (max-width: 992px) {
  .section-spacing {
    padding: var(--space-tablet) 0;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .section-spacing {
    padding: var(--space-mobile) 0;
  }
  
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--card-border);
    transform: translateY(-150%);
    transition: var(--transition);
    z-index: 999;
  }
  
  .nav-menu.active {
    transform: translateY(0);
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-disclaimer {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .game-frame {
    width: 100%;
    border-radius: var(--radius-md);
  }
  
  .game-frame::before {
    border-radius: calc(var(--radius-md) + 1px);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .page-title {
    font-size: 2rem;
  }
  
  .content-block {
    padding: 2rem 1.5rem;
  }
}