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

:root {
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --accent: #4f46e5;
  --accent-light: #eef2ff;
  --border: #e5e7eb;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-alt: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --accent: #818cf8;
    --accent-light: #1e1b4b;
    --border: #334155;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
  }
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
  backdrop-filter: blur(8px);
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span { color: var(--accent); }

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-left: 1.5rem;
  transition: color 0.2s;
}

nav a:hover, nav a.active { color: var(--accent); }

/* Layout */
.container { max-width: 720px; margin: 0 auto; padding: 0 1.5rem; }
.wide-container { max-width: 960px; margin: 0 auto; padding: 0 1.5rem; }

/* Hero */
.hero {
  text-align: center;
  padding: 5rem 0 3rem;
}

.hero h1 {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto 2rem;
}

.badge {
  display: inline-block;
  height: 54px;
}

/* Features */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  padding: 2rem 0 4rem;
}

.feature-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Content pages */
.page-content {
  padding: 3rem 0 4rem;
}

.page-content h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.page-content .updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 2.5rem;
}

.page-content h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  letter-spacing: -0.01em;
}

.page-content h2:first-of-type {
  border-top: none;
  padding-top: 0;
}

.page-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}

.page-content p {
  margin-bottom: 0.75rem;
}

.page-content ul, .page-content ol {
  margin: 0.5rem 0 1rem 1.5rem;
}

.page-content li {
  margin-bottom: 0.35rem;
}

.page-content a {
  color: var(--accent);
  text-decoration: none;
}

.page-content a:hover {
  text-decoration: underline;
}

.page-content strong {
  font-weight: 600;
}

/* FAQ */
.faq-item {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.faq-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  border: none;
  padding: 0;
}

.faq-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
}

/* Contact card */
.contact-card {
  background: var(--accent-light);
  border: 1px solid var(--accent);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  margin-top: 2rem;
  text-align: center;
}

.contact-card h2 {
  border: none;
  padding-top: 0;
  margin-top: 0;
}

.contact-card a {
  color: var(--accent);
  font-weight: 600;
  font-size: 1.1rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 0.75rem;
}

footer a:hover { color: var(--accent); }

/* Responsive */
@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1.05rem; }
  nav a { margin-left: 1rem; font-size: 0.85rem; }
  .features { grid-template-columns: 1fr; }
}