:root {
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --ink: #17201C;
  --ink-soft: #4A5A53;
  --green-deep: #0E3B2E;
  --green: #14805E;
  --lime: #C9F26E;
  --border: #E4E8E2;
  --radius: 14px;
  --maxw: 1080px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 17px;
}
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* Header */
header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0;
}
.logo {
  font-weight: 800; font-size: 1.3rem; color: var(--green-deep);
  text-decoration: none; letter-spacing: -0.02em;
}
.logo .ia {
  background: var(--lime); color: var(--green-deep);
  padding: 1px 7px; border-radius: 7px; margin-left: 2px;
}
.nav-links a {
  color: var(--ink-soft); text-decoration: none; margin-left: 28px;
  font-size: 0.95rem; font-weight: 500;
}
.nav-links a:hover { color: var(--green-deep); }

/* Hero */
.hero { padding: 84px 0 72px; }
.hero .kicker {
  display: inline-block; background: #EDF7DC; color: #3E6212;
  font-size: 0.8rem; font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; padding: 6px 14px; border-radius: 100px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem); line-height: 1.15;
  letter-spacing: -0.03em; color: var(--green-deep); max-width: 720px;
  font-weight: 800;
}
.hero p.lead {
  font-size: 1.2rem; color: var(--ink-soft); max-width: 620px; margin-top: 20px;
}
.cta-row { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 700;
  padding: 14px 26px; border-radius: 100px; font-size: 1rem;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--green-deep); color: #fff; }
.btn-secondary { background: var(--lime); color: var(--green-deep); }

/* Article grid */
.section { padding: 56px 0; }
.section h2 {
  font-size: 1.7rem; letter-spacing: -0.02em; color: var(--green-deep);
  margin-bottom: 8px; font-weight: 800;
}
.section .sub { color: var(--ink-soft); margin-bottom: 34px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  text-decoration: none; color: var(--ink);
  transition: transform .15s ease, box-shadow .15s ease;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(14,59,46,0.10); }
.card .tag {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--green); margin-bottom: 12px;
}
.card h3 { font-size: 1.15rem; line-height: 1.4; letter-spacing: -0.01em; margin-bottom: 10px; }
.card p { font-size: 0.94rem; color: var(--ink-soft); flex: 1; }
.card .read { margin-top: 16px; font-weight: 700; font-size: 0.9rem; color: var(--green-deep); }

/* Article page */
.article-header { padding: 64px 0 8px; max-width: 760px; margin: 0 auto; }
.article-header .tag {
  font-size: 0.8rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--green);
}
.article-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.2;
  letter-spacing: -0.02em; color: var(--green-deep); margin-top: 12px; font-weight: 800;
}
.article-header .meta { color: var(--ink-soft); font-size: 0.9rem; margin-top: 14px; }
.article-body { max-width: 760px; margin: 0 auto; padding: 24px 0 64px; }
.article-body h2 { font-size: 1.45rem; color: var(--green-deep); margin: 40px 0 14px; letter-spacing: -0.01em; }
.article-body h3 { font-size: 1.15rem; color: var(--green-deep); margin: 28px 0 10px; }
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol { margin: 0 0 18px 24px; }
.article-body li { margin-bottom: 8px; }
.article-body .prompt-box {
  background: #10281F; color: #DFF5C8; border-radius: var(--radius);
  padding: 22px 26px; margin: 22px 0; font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9rem; line-height: 1.6; white-space: pre-wrap;
}
.article-body .note {
  background: #F2F8EC; border-left: 4px solid var(--green);
  padding: 16px 20px; border-radius: 0 10px 10px 0; margin: 22px 0;
  font-size: 0.95rem;
}

/* Footer */
footer {
  background: var(--green-deep); color: #C7D6CF; padding: 48px 0 36px;
  margin-top: 40px; font-size: 0.9rem;
}
footer .logo { color: #fff; display: inline-block; margin-bottom: 16px; }
footer .logo .ia { background: var(--lime); }
footer .disclaimer {
  border-top: 1px solid rgba(255,255,255,0.15); margin-top: 24px; padding-top: 20px;
  font-size: 0.8rem; line-height: 1.6; color: #9DB3AA;
}
@media (max-width: 640px) {
  .nav-links a { margin-left: 16px; font-size: 0.85rem; }
  .hero { padding: 56px 0 44px; }
}