:root {
  --bg: #f6f7f5;
  --panel: #ffffff;
  --ink: #1c2321;
  --ink-soft: #5b6360;
  --line: #e2e6e1;
  --accent: #2f6f4e;
  --accent-soft: #e8f1ec;
  --accent-ink: #1d4d35;
  --sidebar: #1f2723;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(28, 35, 33, 0.06), 0 8px 24px rgba(28, 35, 33, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
}

a { color: var(--accent-ink); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}

.brand-logo { border-radius: 10px; display: block; }

.brand-name {
  display: block;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-tag {
  display: block;
  font-size: 12px;
  color: var(--ink-soft);
}

.site-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 14px;
}

.site-nav a {
  text-decoration: none;
  font-weight: 600;
}

.site-nav a:hover { text-decoration: underline; }

.hero {
  background: linear-gradient(160deg, var(--sidebar) 0%, #2a3530 55%, var(--accent-ink) 100%);
  color: #fff;
  padding: 56px 28px 64px;
}

.hero-inner {
  max-width: 960px;
  margin: 0 auto;
}

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 1.125rem;
  max-width: 720px;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: 28px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
}

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

.btn-secondary {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.35);
  color: #fff;
}

.content {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px 56px;
}

.section {
  margin-bottom: 36px;
}

.section h2 {
  font-size: 1.35rem;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section p {
  color: var(--ink);
  margin-bottom: 10px;
}

.purpose-box {
  background: var(--accent-soft);
  border: 1px solid #c8dccf;
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 36px;
}

.purpose-box h2 {
  color: var(--accent-ink);
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.purpose-box p {
  font-size: 15px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  box-shadow: var(--shadow);
}

.feature-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--accent-ink);
}

.feature-card p {
  font-size: 14px;
  color: var(--ink-soft);
}

.oauth-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
}

.oauth-box ul {
  margin: 10px 0 0 1.2em;
}

.oauth-box li {
  margin-bottom: 8px;
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 18px 28px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-soft);
  background: var(--panel);
}

@media (max-width: 640px) {
  .hero { padding: 40px 18px 48px; }
  .site-header, .site-footer { padding-left: 18px; padding-right: 18px; }
}