:root {
  --bg-primary: #0e0e10;
  --bg-secondary: #0a0a0c;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.55);
  --text-muted: rgba(255, 255, 255, 0.4);
  --accent: #0a84ff;
  --accent-hover: #409cff;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.1);
}

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

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 0 4rem;
  animation: fadeIn 0.6s ease-out;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--text-secondary) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 500;
  color: var(--text-primary);
  margin: 0 0 1rem;
}

.hero-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Features */
.features {
  padding: 2rem 0 4rem;
  animation: fadeIn 0.6s ease-out 0.15s both;
}

.features-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  text-align: center;
  margin: 0 0 2.5rem;
  color: var(--text-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  background: var(--surface-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
  opacity: 0.9;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* Footer */
.footer {
  text-align: center;
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border);
  animation: fadeIn 0.6s ease-out 0.3s both;
}

.footer p {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin: 0;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}