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

:root {
  --green: #16A34A;
  --green-light: #f0fdf4;
  --black: #0A0A0A;
  --gray-1: #1a1a1a;
  --gray-2: #333;
  --gray-3: #555;
  --gray-4: #888;
  --gray-5: #bbb;
  --gray-6: #e5e7eb;
  --bg: #fff;
  --radius: 8px;
  --font: 'Geist', system-ui, -apple-system, sans-serif;
}

html { font-size: 16px; }
body { font-family: var(--font); color: var(--gray-2); background: var(--bg); line-height: 1.7; }

/* NAV */
nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; padding: 0 40px;
  background: rgba(255,255,255,0.9); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-6);
}
.logo { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.brand-mark {
  width: 22px; height: 22px;
  border: 2px solid var(--black); border-radius: 4px;
  position: relative; flex-shrink: 0;
}
.brand-mark::after {
  content: ''; position: absolute;
  bottom: -3px; right: -3px;
  width: 7px; height: 7px;
  background: var(--green); border-radius: 50%; border: 2px solid #fff;
}
.logo-name { font-size: 15px; font-weight: 600; color: var(--black); }
.logo-name span { color: var(--green); }
.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 14px; font-weight: 500; color: var(--gray-3); text-decoration: none; transition: color .15s; }
.nav-links a:hover { color: var(--black); }
.btn-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 18px; border-radius: 6px;
  background: var(--black); color: #fff;
  font-size: 13px; font-weight: 600; text-decoration: none;
  transition: background .15s;
}
.btn-cta:hover { background: #222; }

/* BLOG INDEX GRID */
.blog-hero {
  padding: 80px 40px 60px;
  text-align: center;
  background: linear-gradient(160deg, #fff 60%, var(--green-light) 100%);
}
.blog-hero h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; color: var(--black); letter-spacing: -1.5px; }
.blog-hero p { margin-top: 16px; font-size: 18px; color: var(--gray-3); max-width: 520px; margin-inline: auto; }

.blog-grid {
  max-width: 1100px; margin: 0 auto;
  padding: 60px 40px 100px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.article-card {
  border: 1px solid var(--gray-6); border-radius: 12px;
  padding: 28px; text-decoration: none; color: inherit;
  transition: box-shadow .2s, transform .2s;
  display: flex; flex-direction: column; gap: 12px;
}
.article-card:hover { box-shadow: 0 8px 32px rgba(0,0,0,.08); transform: translateY(-2px); }
.card-tag { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--green); }
.card-title { font-size: 17px; font-weight: 700; color: var(--black); line-height: 1.35; }
.card-excerpt { font-size: 14px; color: var(--gray-3); line-height: 1.6; }
.card-meta { margin-top: auto; font-size: 12px; color: var(--gray-4); }
.card-arrow { margin-top: 4px; font-size: 13px; font-weight: 600; color: var(--green); }

/* ARTICLE PAGE */
.article-wrapper { max-width: 720px; margin: 0 auto; padding: 60px 24px 100px; }
.article-back { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--gray-3); text-decoration: none; margin-bottom: 32px; transition: color .15s; }
.article-back:hover { color: var(--black); }
.article-tag { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--green); }
.article-wrapper h1 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800; color: var(--black); letter-spacing: -1px; line-height: 1.2; margin: 12px 0 16px; }
.article-meta { font-size: 13px; color: var(--gray-4); margin-bottom: 36px; padding-bottom: 28px; border-bottom: 1px solid var(--gray-6); }
.article-wrapper h2 { font-size: 1.4rem; font-weight: 700; color: var(--black); margin: 40px 0 16px; }
.article-wrapper h3 { font-size: 1.1rem; font-weight: 700; color: var(--gray-1); margin: 28px 0 10px; }
.article-wrapper p { margin-bottom: 20px; font-size: 17px; color: var(--gray-2); line-height: 1.75; }
.article-wrapper ul, .article-wrapper ol { margin: 0 0 20px 24px; }
.article-wrapper li { margin-bottom: 8px; font-size: 16px; color: var(--gray-2); line-height: 1.65; }
.article-wrapper strong { color: var(--black); font-weight: 600; }
.highlight-box {
  background: var(--green-light); border-left: 3px solid var(--green);
  border-radius: 0 8px 8px 0; padding: 20px 24px; margin: 32px 0;
}
.highlight-box p { margin: 0; font-size: 16px; color: var(--gray-1); }

/* CTA BANNER */
.cta-banner {
  background: var(--black); border-radius: 16px;
  padding: 48px 40px; text-align: center;
  margin: 60px 0 0;
}
.cta-banner h2 { color: #fff; font-size: 1.8rem; font-weight: 800; letter-spacing: -.5px; margin-bottom: 12px; }
.cta-banner p { color: #aaa; font-size: 16px; margin-bottom: 28px; }
.cta-banner .btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 8px; background: var(--green); color: #fff; font-size: 15px; font-weight: 700; text-decoration: none; transition: background .15s; }
.cta-banner .btn:hover { background: #15803d; }
.cta-banner .note { margin-top: 16px; font-size: 13px; color: #666; margin-bottom: 0; }

/* FOOTER */
footer { border-top: 1px solid var(--gray-6); padding: 32px 40px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 13px; color: var(--gray-4); text-decoration: none; }
.footer-links a:hover { color: var(--gray-2); }
.footer-copy { font-size: 13px; color: var(--gray-4); }

@media (max-width: 900px) {
  nav { padding: 0 20px; }
  .nav-links { display: none; }
  .blog-hero { padding: 60px 20px 40px; }
  .blog-grid { grid-template-columns: 1fr; padding: 40px 20px 60px; }
  .article-wrapper { padding: 40px 20px 60px; }
  .cta-banner { padding: 36px 24px; }
  footer { padding: 28px 20px; flex-direction: column; text-align: center; }
}