/* TechPath Guides — main stylesheet */
:root {
  --ink: #0f172a;
  --muted: #475569;
  --soft: #64748b;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --brand: #0284c7;
  --brand-dark: #0369a1;
  --accent: #f59e0b;
  --radius: 12px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
}
img { max-width: 100%; height: auto; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: var(--ink);
  color: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 12px rgba(0,0,0,.18);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 800; font-size: 1.15rem; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 800; font-size: 1rem; flex: none;
}
.main-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; }
.main-nav a {
  color: #e2e8f0; padding: 8px 12px; border-radius: 8px; font-size: .95rem; font-weight: 600;
}
.main-nav a:hover, .main-nav a.active { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; }
.nav-toggle { display: none; background: none; border: 1px solid #475569; color: #fff; border-radius: 8px; padding: 8px 12px; font-size: 1rem; cursor: pointer; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #0f172a 0%, #0369a1 70%, #0284c7 100%);
  color: #fff;
  padding: 64px 0 56px;
}
.hero h1 { font-size: 2.4rem; line-height: 1.2; margin: 0 0 12px; letter-spacing: -0.5px; }
.hero p.lead { font-size: 1.15rem; color: #d6e9f5; max-width: 640px; margin: 0 0 24px; }
.btn {
  display: inline-block; background: var(--accent); color: #1c1005;
  font-weight: 700; padding: 12px 22px; border-radius: 10px; font-size: 1rem;
}
.btn:hover { background: #d97706; color: #fff; text-decoration: none; }
.btn-ghost {
  display: inline-block; border: 2px solid rgba(255,255,255,.5); color: #fff;
  font-weight: 700; padding: 10px 20px; border-radius: 10px; margin-left: 10px;
}
.btn-ghost:hover { border-color: #fff; text-decoration: none; }

/* Sections */
.section { padding: 48px 0; }
.section.alt { background: var(--bg-soft); }
.section h2 { font-size: 1.7rem; margin: 0 0 8px; letter-spacing: -0.3px; }
.section .sub { color: var(--muted); margin: 0 0 28px; max-width: 680px; }

/* Guide cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.card {
  border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
  padding: 22px; display: flex; flex-direction: column; transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(15,23,42,.10); }
.card .kicker { font-size: .75rem; font-weight: 800; letter-spacing: 1.5px; text-transform: uppercase; color: var(--brand); margin-bottom: 8px; }
.card h3 { margin: 0 0 8px; font-size: 1.12rem; line-height: 1.4; }
.card h3 a { color: var(--ink); }
.card p { color: var(--muted); font-size: .95rem; margin: 0 0 14px; flex: 1; }
.card .read { font-weight: 700; font-size: .95rem; }

/* Article */
.breadcrumb { font-size: .85rem; color: var(--soft); margin: 22px 0 6px; }
.breadcrumb a { color: var(--soft); }
.article-wrap { display: grid; grid-template-columns: 1fr 300px; gap: 40px; align-items: start; }
article.guide h1 { font-size: 2rem; line-height: 1.25; letter-spacing: -0.5px; margin: 0 0 10px; }
.byline { color: var(--soft); font-size: .9rem; margin-bottom: 24px; border-bottom: 1px solid var(--line); padding-bottom: 18px; }
article.guide h2 { font-size: 1.45rem; margin: 36px 0 12px; letter-spacing: -0.3px; }
article.guide h3 { font-size: 1.15rem; margin: 26px 0 8px; }
article.guide p { margin: 0 0 16px; }
article.guide ul, article.guide ol { margin: 0 0 18px; padding-left: 24px; }
article.guide li { margin-bottom: 8px; }
article.guide table { width: 100%; border-collapse: collapse; margin: 0 0 20px; font-size: .95rem; }
article.guide th, article.guide td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
article.guide th { background: var(--bg-soft); font-weight: 700; }
article.guide blockquote {
  border-left: 4px solid var(--accent); background: #fffbeb;
  margin: 0 0 18px; padding: 14px 18px; border-radius: 0 8px 8px 0; color: var(--ink);
}
.callout {
  background: #f0f9ff; border: 1px solid #bae6fd; border-radius: var(--radius);
  padding: 18px 20px; margin: 0 0 20px; font-size: .97rem;
}
.callout strong { color: var(--brand-dark); }
.sidebar { position: sticky; top: 90px; }
.side-box { border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; background: var(--bg-soft); margin-bottom: 20px; }
.side-box h3 { margin: 0 0 12px; font-size: 1.05rem; }
.side-box ul { list-style: none; margin: 0; padding: 0; }
.side-box li { margin-bottom: 10px; font-size: .93rem; }

/* Static pages */
.page h1 { font-size: 2rem; letter-spacing: -0.5px; margin: 28px 0 16px; }
.page h2 { font-size: 1.35rem; margin: 30px 0 10px; }
.page p, .page li { color: #1e293b; }
.page ul { padding-left: 24px; }

/* Footer */
.site-footer { background: var(--ink); color: #cbd5e1; margin-top: 56px; }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 44px 20px 28px;
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px;
}
.site-footer h4 { color: #fff; margin: 0 0 12px; font-size: 1rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; font-size: .93rem; }
.site-footer a { color: #cbd5e1; }
.footer-bottom {
  border-top: 1px solid #1e293b; padding: 18px 20px; text-align: center;
  font-size: .85rem; color: #94a3b8; max-width: var(--maxw); margin: 0 auto;
}

/* Responsive */
@media (max-width: 900px) {
  .article-wrap { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero { padding: 44px 0 40px; }
  .hero h1 { font-size: 1.8rem; }
  .nav-toggle { display: block; }
  .main-nav { display: none; width: 100%; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 2px; padding: 8px 0; }
  .header-inner { flex-wrap: wrap; }
  .footer-inner { grid-template-columns: 1fr; }
  article.guide h1 { font-size: 1.6rem; }
}