:root {
  --ink: #0f172a;
  --ink-soft: #475569;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --line: #e2e8f0;
  --accent: #0d9488;
  --accent-ink: #ffffff;
  --highlight: #ccfbf1;
  --max: 1040px;
  font-size: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header.site {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--ink);
}
.brand .mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #134e4a);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 0.85rem;
}
.brand .logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: block;
}
nav.site a {
  color: var(--ink-soft);
  font-weight: 500;
  margin-left: 28px;
  font-size: 0.95rem;
}
nav.site a:hover { color: var(--ink); text-decoration: none; }
.btn {
  display: inline-block;
  background: var(--ink);
  color: white !important;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}
.btn:hover { background: #1e293b; text-decoration: none; }
.btn.accent { background: var(--accent); }
.btn.accent:hover { background: #0f766e; }

/* Hero */
.hero {
  padding: 72px 0 48px;
  text-align: center;
}
.hero h1 {
  font-size: 2.5rem;
  line-height: 1.15;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.hero p.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto 28px;
}
.hero .cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 12px;
}
.hero .note {
  font-size: 0.85rem;
  color: #94a3b8;
}
.hero-image {
  margin-top: 48px;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 24px 60px -24px rgba(15, 23, 42, 0.25);
}

/* Sections */
section { padding: 56px 0; }
section.soft { background: var(--bg-soft); }
h2.section-title {
  font-size: 1.7rem;
  text-align: center;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
p.section-sub {
  text-align: center;
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto 40px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 720px) {
  .grid-3 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
}

.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
}
.card .num {
  display: inline-flex;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--highlight);
  color: #0f766e;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 14px;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}
.card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* CTA band */
.cta-band {
  text-align: center;
  padding: 64px 0;
}
.cta-band h2 { margin: 0 0 12px; font-size: 1.8rem; }
.cta-band p { color: var(--ink-soft); margin: 0 0 24px; }

/* Feature steps (vertical) */
.feature-steps {
  display: flex;
  flex-direction: column;
  gap: 64px;
  max-width: 720px;
  margin: 0 auto;
}
.feature-step {
  text-align: center;
}
.feature-step .step {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.feature-step h3 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}
.feature-step p {
  margin: 0 auto 20px;
  color: var(--ink-soft);
  font-size: 0.95rem;
  max-width: 520px;
}
.feature-step .frame {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 16px 40px -20px rgba(15, 23, 42, 0.25);
}

/* Footer */
footer.site {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  color: #94a3b8;
  font-size: 0.85rem;
}
footer.site .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
footer.site a { color: #64748b; }

/* Blog */
.blog-list { max-width: 720px; margin: 0 auto; }
.post-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.post-item h3 { margin: 0 0 6px; font-size: 1.15rem; }
.post-item .meta { color: #94a3b8; font-size: 0.85rem; margin-bottom: 8px; }
.post-item p { color: var(--ink-soft); margin: 0; }

article.post {
  max-width: 680px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
article.post .meta {
  color: #94a3b8;
  font-size: 0.9rem;
  margin-bottom: 12px;
}
article.post h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
article.post h2 {
  font-size: 1.35rem;
  margin: 40px 0 12px;
}
article.post p {
  color: #334155;
  font-size: 1.02rem;
  margin: 0 0 18px;
}
article.post ul {
  color: #334155;
  padding-left: 22px;
}
article.post li { margin-bottom: 8px; }
article.post .callout {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 28px 0;
}
article.post .callout p:last-child { margin-bottom: 0; }