:root {
  --bg: #0F0F1A;
  --card: #242430;
  --accent: #8C73FF;
  --cyan: #66E5FF;
  --text: #FFFFFF;
  --text-secondary: rgba(255,255,255,0.75);
  --text-tertiary: rgba(255,255,255,0.50);
  --border: rgba(255,255,255,0.08);
  --gradient: linear-gradient(135deg, var(--accent), var(--cyan));
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--cyan); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }

.container { max-width: 800px; margin: 0 auto; padding: 0 24px; }

/* Nav */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15,15,26,0.85);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; }
.nav-brand img { width: 28px; height: 28px; border-radius: 6px; }
.nav-links { display: flex; gap: 20px; font-size: 13px; }
.nav-links a { color: var(--text-secondary); }
.nav-links a:hover { color: var(--text); }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 0 60px;
  background: radial-gradient(ellipse at 50% 0%, rgba(140,115,255,0.1) 0%, transparent 60%);
}
.hero-ring {
  width: 180px; height: 180px;
  margin: 0 auto 32px;
  border-radius: 50%;
  background: conic-gradient(from -90deg, var(--accent), var(--cyan), var(--accent));
  -webkit-mask: radial-gradient(circle, transparent 62%, black 63%);
  mask: radial-gradient(circle, transparent 62%, black 63%);
  animation: pulse 4s ease-in-out infinite;
  filter: drop-shadow(0 0 24px rgba(140,115,255,0.4));
}
@keyframes pulse {
  0%, 100% { filter: drop-shadow(0 0 24px rgba(140,115,255,0.4)); }
  50% { filter: drop-shadow(0 0 40px rgba(102,230,255,0.5)); }
}
.hero h1 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.hero p { color: var(--text-secondary); font-size: 16px; margin-bottom: 32px; max-width: 480px; margin-left: auto; margin-right: auto; }
.app-store-btn {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--text); color: var(--bg);
  padding: 12px 28px; border-radius: 12px;
  font-weight: 700; font-size: 15px;
  transition: transform 0.2s, box-shadow 0.2s;
}
.app-store-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(140,115,255,0.3); opacity: 1; }
.app-store-btn svg { width: 22px; height: 22px; }

/* Features */
.features { padding: 60px 0; }
.features h2 { text-align: center; font-size: 22px; margin-bottom: 36px; }
.feature-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 20px;
  text-align: center;
  transition: border-color 0.3s;
}
.feature-card:hover { border-color: rgba(140,115,255,0.3); }
.feature-icon {
  font-size: 32px; margin-bottom: 12px;
  background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.feature-card h3 { font-size: 15px; margin-bottom: 8px; }
.feature-card p { color: var(--text-tertiary); font-size: 13px; line-height: 1.6; }

/* Philosophy */
.philosophy {
  padding: 60px 0;
  text-align: center;
}
.philosophy h2 { font-size: 22px; margin-bottom: 16px; }
.philosophy p { color: var(--text-secondary); max-width: 560px; margin: 0 auto; font-size: 15px; }

/* CTA */
.cta {
  text-align: center;
  padding: 60px 0 80px;
}
.cta h2 { font-size: 22px; margin-bottom: 24px; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 12px;
}
footer .footer-links { margin-bottom: 12px; display: flex; justify-content: center; gap: 20px; }
footer .footer-links a { color: var(--text-tertiary); font-size: 12px; }

/* Pages */
.page-header {
  padding: 48px 0 32px;
  text-align: center;
  background: radial-gradient(ellipse at 50% 0%, rgba(140,115,255,0.08) 0%, transparent 60%);
}
.page-header h1 { font-size: 24px; }
.page-content { padding: 40px 0 80px; }
.page-content h2 { font-size: 18px; margin: 32px 0 12px; color: var(--text); }
.page-content p, .page-content li { color: var(--text-secondary); font-size: 14px; line-height: 1.8; }
.page-content ul { padding-left: 20px; }
.page-content ul li { margin-bottom: 6px; }

/* FAQ accordion */
details {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; margin-bottom: 12px;
}
details summary {
  padding: 16px 20px; cursor: pointer; font-weight: 600; font-size: 15px;
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
details summary::after { content: "+"; color: var(--accent); font-size: 20px; }
details[open] summary::after { content: "−"; }
details .faq-answer { padding: 0 20px 16px; color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

/* Support */
.contact-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 32px; text-align: center;
}
.contact-card a {
  display: inline-block; margin-top: 16px;
  background: var(--gradient); color: var(--bg);
  padding: 10px 24px; border-radius: 10px; font-weight: 700;
}

@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 24px; }
  .nav-links { gap: 12px; font-size: 12px; }
}