/* Smart AI Tools — shared stylesheet */
:root {
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-soft: #eff6ff;
  --ink: #0f172a;
  --muted: #475569;
  --bg: #ffffff;
  --bg-soft: #f8fafc;
  --border: #e2e8f0;
  --radius: 12px;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  line-height: 1.7;
  background: var(--bg);
  font-size: 1.02rem;
}

.container { max-width: 880px; margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.site-header { border-bottom: 1px solid var(--border); background: #fff; position: sticky; top: 0; z-index: 20; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 0.75rem; padding: 0.85rem 1.25rem; flex-wrap: wrap; }
.logo { font-weight: 800; font-size: 1.2rem; color: var(--accent); text-decoration: none; }
.main-nav { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.main-nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
.main-nav a:hover, .main-nav a.active { color: var(--accent); font-weight: 600; }

/* Hero */
.hero { background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%); padding: 3.5rem 0; text-align: center; }
.hero h1 { font-size: 2.3rem; line-height: 1.25; margin-bottom: 0.8rem; }
.hero p { color: var(--muted); max-width: 640px; margin: 0 auto 1.5rem; font-size: 1.08rem; }
.btn { display: inline-block; background: var(--accent); color: #fff; text-decoration: none; padding: 0.7rem 1.6rem; border-radius: 999px; font-weight: 600; }
.btn:hover { background: var(--accent-dark); }
.btn-outline { background: #fff; color: var(--accent); border: 2px solid var(--accent); }
.btn-outline:hover { background: var(--accent-soft); }

/* Sections */
.section { padding: 2.75rem 0; }
.section h2 { font-size: 1.6rem; margin-bottom: 1rem; }
.section-alt { background: var(--bg-soft); }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1.25rem; margin-top: 1.25rem; }
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.4rem; background: #fff; display: flex; flex-direction: column; gap: 0.6rem; }
.card h3 { font-size: 1.08rem; line-height: 1.4; }
.card h3 a { color: var(--ink); text-decoration: none; }
.card h3 a:hover { color: var(--accent); }
.card p { color: var(--muted); font-size: 0.95rem; flex: 1; }
.card .read-more { color: var(--accent); font-weight: 600; text-decoration: none; font-size: 0.95rem; }

/* Category list */
.cat-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 1rem; margin-top: 1.25rem; list-style: none; }
.cat-list li { border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem; background: #fff; }
.cat-list strong { display: block; margin-bottom: 0.3rem; }
.cat-list span { color: var(--muted); font-size: 0.92rem; }

/* Article */
.post { padding: 2.5rem 0 3rem; }
.post h1 { font-size: 2rem; line-height: 1.3; margin-bottom: 0.6rem; }
.post .lede { font-size: 1.12rem; color: var(--muted); margin-bottom: 1.8rem; }
.answer-first { background: var(--accent-soft); border: 1px solid #bfdbfe; border-radius: var(--radius); padding: 1.1rem 1.3rem; margin: 0 0 1.8rem; font-size: 1.02rem; }
.answer-first strong { color: var(--accent-dark); }
.post h2 { font-size: 1.45rem; margin: 2rem 0 0.8rem; padding-top: 0.5rem; }
.post h3 { font-size: 1.15rem; margin: 1.4rem 0 0.5rem; }
.post p { margin-bottom: 1rem; }
.post ul, .post ol { margin: 0 0 1.1rem 1.4rem; }
.post li { margin-bottom: 0.45rem; }
.post a { color: var(--accent); }
.breadcrumb { font-size: 0.88rem; color: var(--muted); margin-bottom: 1.2rem; }
.breadcrumb a { color: var(--accent); text-decoration: none; }
.callout { background: var(--accent-soft); border-left: 4px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; padding: 1rem 1.25rem; margin: 1.5rem 0; }
.callout p { margin: 0; }
.faq { margin-top: 2.5rem; border-top: 2px solid var(--border); padding-top: 1.5rem; }
.faq h2 { margin-top: 0; }
.faq h3 { font-size: 1.05rem; margin: 1.3rem 0 0.4rem; }
.faq p { color: var(--muted); }

/* CTA box */
.cta-box { background: linear-gradient(135deg, #eff6ff, #dbeafe); border-radius: var(--radius); padding: 2rem; text-align: center; margin: 2.5rem 0; }
.cta-box h2 { margin-bottom: 0.6rem; }
.cta-box p { color: var(--muted); margin-bottom: 1.2rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); padding: 2.2rem 0 1.5rem; margin-top: 2rem; }
.footer-grid { display: flex; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.footer-grid nav { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.footer-grid a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
.footer-grid a:hover { color: var(--accent); }
.copyright { color: var(--muted); font-size: 0.88rem; border-top: 1px solid var(--border); padding-top: 1.2rem; }

/* Responsive */
@media (max-width: 640px) {
  .hero h1 { font-size: 1.75rem; }
  .post h1 { font-size: 1.6rem; }
  .header-inner { justify-content: center; text-align: center; }
  .main-nav { justify-content: center; gap: 0.8rem; }
}