@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --ink: #0d0d0d;
  --ink-muted: #5a5a5a;
  --ink-faint: #999;
  --paper: #fafaf7;
  --surface: #ffffff;
  --accent: #00b37e;
  --accent-dark: #007a54;
  --accent-light: #e6f7f1;
  --border: rgba(0,0,0,0.08);
  --border-strong: rgba(0,0,0,0.15);
  --radius: 12px;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* NAV */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon { width: 36px; height: 36px; }
.logo-text { font-family: var(--font-display); font-size: 1.35rem; color: var(--ink); letter-spacing: -0.02em; }
.logo-text span { color: var(--accent); }
.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.nav-links a { font-size: 0.875rem; font-weight: 500; color: var(--ink-muted); text-decoration: none; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* ARTICLE LAYOUT */
.article-wrap {
  max-width: 740px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  flex: 1;
  width: 100%;
}

/* HEADER */
.article-header { margin-bottom: 2.5rem; }
.breadcrumb { font-size: 0.8rem; color: var(--ink-faint); margin-bottom: 1rem; }
.breadcrumb a { color: var(--ink-faint); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.article-tag {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent-dark);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
  margin-bottom: 1rem;
}
.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 1rem;
}
.article-header h1 em { font-style: italic; color: var(--accent); }
.article-meta { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.article-meta time, .article-meta .read-time { font-size: 0.82rem; color: var(--ink-faint); }
.article-intro {
  font-size: 1.05rem;
  color: var(--ink-muted);
  line-height: 1.7;
  border-left: 3px solid var(--accent);
  padding-left: 1.25rem;
  margin: 1.75rem 0 2rem;
}

/* BODY */
.article-body h2 {
  font-family: var(--font-display);
  font-size: 1.55rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 2.5rem 0 0.85rem;
  line-height: 1.2;
}
.article-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin: 1.75rem 0 0.6rem;
}
.article-body p {
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--ink-muted);
  margin-bottom: 1.1rem;
}
.article-body strong { color: var(--ink); font-weight: 600; }
.article-body a { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 3px; }
.article-body ul, .article-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.article-body li {
  font-size: 0.97rem;
  line-height: 1.75;
  color: var(--ink-muted);
  margin-bottom: 0.4rem;
}
.article-body li strong { color: var(--ink); }

/* CALLOUT BOXES */
.callout {
  background: var(--accent-light);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.25rem;
  margin: 1.75rem 0;
}
.callout p { margin: 0; color: var(--accent-dark); font-size: 0.92rem; }
.callout strong { color: var(--accent-dark); }

.callout-warn {
  background: #FAEEDA;
  border-left: 3px solid #EF9F27;
}
.callout-warn p { color: #633806; }
.callout-warn strong { color: #412402; }

/* DATA TABLE */
.data-table-wrap { overflow-x: auto; margin: 1.75rem 0; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.data-table th {
  background: var(--paper);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--ink);
  text-align: left;
  padding: 0.65rem 0.9rem;
  border: 1px solid var(--border-strong);
}
.data-table td {
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--border);
  color: var(--ink-muted);
  line-height: 1.5;
}
.data-table tr:nth-child(even) td { background: rgba(0,0,0,0.015); }

/* CTA BLOCK */
.cta-block {
  background: var(--ink);
  color: #fff;
  border-radius: 16px;
  padding: 2rem 2.5rem;
  text-align: center;
  margin: 3rem 0 2rem;
}
.cta-block h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: 0.5rem;
  color: #fff;
}
.cta-block p { font-size: 0.9rem; color: rgba(255,255,255,0.7); margin-bottom: 1.25rem; }
.cta-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.8rem 2rem;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.2s;
}
.cta-btn:hover { background: var(--accent-dark); }

/* RELATED POSTS */
.related { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.related h3 { font-size: 0.9rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); margin-bottom: 1rem; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0.75rem; }
.related-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-decoration: none;
  transition: border-color 0.2s;
}
.related-card:hover { border-color: var(--accent); }
.related-card span { display: block; font-size: 0.82rem; color: var(--ink-muted); line-height: 1.4; }

/* FOOTER */
footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  background: var(--surface);
}
footer p { font-size: 0.8rem; color: var(--ink-faint); }
.footer-links { display: flex; gap: 1.25rem; list-style: none; }
.footer-links a { font-size: 0.8rem; color: var(--ink-muted); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }

@media (max-width: 560px) {
  nav { padding: 0.875rem 1rem; }
  .nav-links { display: none; }
  .article-wrap { padding: 2rem 1rem 4rem; }
  .cta-block { padding: 1.5rem; }
  footer { flex-direction: column; }
}