:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --bg-muted: #eef2f7;
  --surface: #ffffff;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #dbe2ea;
  --accent: #4285f4;
  --accent-dark: #3367d6;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
}

.container {
  width: min(100% - 32px, 960px);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.site-nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
  color: var(--text-muted);
}

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

.hero {
  padding: 72px 0 56px;
}

.hero-inner {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 5vw, 3rem);
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 3vw, 2rem);
}

h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.lead,
.section-intro,
.note,
.footer-note {
  color: var(--text-muted);
}

.lead {
  margin: 0 0 24px;
  font-size: 1.1rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  font-weight: 600;
}

.btn:hover {
  border-color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--text-muted);
  font-size: 14px;
}

.hero-points li::before {
  content: '✓ ';
  color: var(--accent);
  font-weight: 700;
}

.section {
  padding: 56px 0;
}

.section-muted {
  background: var(--bg-muted);
}

.card-grid,
.promise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.card,
.promise {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card p,
.promise p,
.note {
  margin: 0;
}

.steps {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.steps li {
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
}

.steps strong {
  display: block;
  margin-bottom: 4px;
}

.steps span {
  color: var(--text-muted);
}

.note {
  margin-top: 20px;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  background: var(--surface);
  border-radius: 8px;
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-muted);
  font-size: 0.9em;
}

.site-footer {
  padding: 28px 0 40px;
  border-top: 1px solid var(--border);
}

.footer-inner p {
  margin: 0 0 8px;
}

@media (max-width: 640px) {
  .site-nav {
    display: none;
  }

  .hero {
    padding-top: 48px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-muted: #111827;
    --surface: #1f2937;
    --text: #f9fafb;
    --text-muted: #9ca3af;
    --border: #374151;
    --shadow: none;
  }

  .site-header {
    background: rgba(17, 24, 39, 0.92);
  }
}