/* 
  Luxury Universal Design System
  Theme: Deep Dark / Gold / Neon Cyan
*/

:root {
  --bg-deep: #0a0b10;
  --bg-surface: #12141d;
  --bg-glass: rgba(18, 20, 29, 0.7);
  --accent-gold: #d4af37;
  --accent-gold-bright: #f1c40f;
  --accent-cyan: #00f2ff;
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  --border-glass: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: 'Inter', 'Noto Sans JP', sans-serif;
  background-color: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.bg-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  background: 
    radial-gradient(circle at 20% 30%, rgba(212, 175, 55, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(0, 242, 255, 0.08) 0%, transparent 40%);
}

.bg-noise {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.03;
  pointer-events: none;
  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");
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Glassmorphism */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: 24px;
  padding: 2.5rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

/* Typography */
h1, h2, h3 {
  font-weight: 900;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 4rem;
  background: linear-gradient(to right, #fff, var(--text-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.highlight {
  color: var(--accent-cyan);
  text-shadow: 0 0 15px rgba(0, 242, 255, 0.3);
}

/* Buttons */
.btn-premium {
  display: inline-block;
  padding: 1.25rem 3rem;
  background: linear-gradient(135deg, var(--accent-gold) 0%, #b8860b 100%);
  color: #000;
  text-decoration: none;
  font-weight: 900;
  border-radius: 100px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(212, 175, 55, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: center;
}

.btn-premium:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(212, 175, 55, 0.5);
  filter: brightness(1.1);
}

/* Hero Section */
.hero {
  padding: 10rem 0 6rem;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid var(--accent-gold);
  color: var(--accent-gold);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 2rem;
}

/* Problem Section */
.problem-list {
  list-style: none;
}

.problem-list li {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.02);
  border-left: 4px solid var(--accent-gold);
  border-radius: 0 12px 12px 0;
  font-size: 1.1rem;
}

.check-icon {
  display: none; /* カスタムスタイルで対応 */
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  padding: 2.5rem;
  text-align: center;
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: var(--accent-cyan);
  color: #000;
  font-size: 1.5rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  box-shadow: 0 0 20px rgba(0, 242, 255, 0.4);
}

/* Comparison */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.comparison-card {
  padding: 2rem;
}

.comparison-card.merit { border-top: 4px solid #48bb78; }
.comparison-card.demerit { border-top: 4px solid #ed8936; }

.comparison-card ul { list-style: none; margin-top: 1.5rem; }
.comparison-card li { margin-bottom: 0.75rem; color: var(--text-secondary); }

/* SNS Buzz */
.sns-buzz-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.tweet-card {
  background: #000;
  border: 1px solid #333;
  border-radius: 16px;
  padding: 1.5rem;
}

/* Footer */
footer {
  padding: 6rem 0;
  border-top: 1px solid var(--border-glass);
  text-align: center;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 1rem;
}

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

.animate-fade-in {
  animation: fadeIn 1s ease forwards;
}

/* Responsive */
@media (max-width: 768px) {
  .section-title { font-size: 2rem; }
  .hero { padding: 6rem 0 4rem; }
}