/* ============================================================
   Koray SEO Generator — Production CSS Design System
   Trust-first design for topical authority websites.
   ============================================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* --- Design Tokens --- */
:root {
  --primary: #1a56db;
  --primary-hover: #1648b8;
  --primary-light: rgba(26, 86, 219, 0.08);
  --accent: #059669;
  --text: #1a1a2e;
  --text-secondary: #4a4a68;
  --text-tertiary: #7c7c96;
  --bg: #ffffff;
  --bg-secondary: #f8f9fc;
  --bg-tertiary: #f1f3f7;
  --border: #e2e4e9;
  --border-light: #eef0f4;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 780px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 0.15s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

/* --- Base --- */
body {
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- Layout --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header --- */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-name {
  font-size: 17px;
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.site-nav { display: flex; gap: 28px; }
.site-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}
.site-nav a:hover { color: var(--primary); }
.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -16px;
  left: 0; right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

/* --- Main / Footer --- */
main { padding: 48px 0 80px; min-height: 60vh; }
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--text-tertiary);
  font-size: 13px;
  text-align: center;
}
.site-footer a { color: var(--text-secondary); text-decoration: none; }

/* --- Typography --- */
h1 { font-size: 32px; font-weight: 800; line-height: 1.2; letter-spacing: -0.03em; margin-bottom: 16px; color: var(--text); }
h2 { font-size: 24px; font-weight: 700; line-height: 1.3; letter-spacing: -0.02em; margin: 48px 0 16px; color: var(--text); padding-top: 8px; }
h3 { font-size: 20px; font-weight: 600; line-height: 1.35; margin: 36px 0 12px; color: var(--text); }
h4 { font-size: 17px; font-weight: 600; margin: 28px 0 8px; color: var(--text-secondary); }
h5, h6 { font-size: 15px; font-weight: 600; margin: 24px 0 8px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.02em; }
p { margin-bottom: 16px; color: var(--text); }

/* --- Links --- */
a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; transition: all var(--transition); }
a:hover { text-decoration-thickness: 2px; color: var(--primary-hover); }

/* --- Lists --- */
ul, ol { margin: 0 0 16px 24px; }
li { margin-bottom: 6px; line-height: 1.65; }
li::marker { color: var(--text-tertiary); }

/* --- Tables --- */
table { width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 14px; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
thead { background: var(--bg-secondary); }
th { text-align: left; padding: 12px 16px; font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-secondary); border-bottom: 2px solid var(--border); }
td { padding: 10px 16px; border-bottom: 1px solid var(--border-light); vertical-align: top; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg-secondary); }

/* --- Breadcrumbs --- */
.breadcrumbs { font-size: 13px; color: var(--text-tertiary); margin-bottom: 24px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.breadcrumbs a { color: var(--text-tertiary); text-decoration: none; transition: color var(--transition); }
.breadcrumbs a:hover { color: var(--primary); }
.breadcrumbs .sep { opacity: 0.35; font-size: 11px; }

/* --- Article Meta --- */
.article-meta { font-size: 14px; color: var(--text-secondary); margin-bottom: 32px; padding-bottom: 20px; border-bottom: 1px solid var(--border); line-height: 1.5; }

/* --- Cards --- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin: 24px 0 32px; }
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; transition: all var(--transition); background: var(--bg); }
.card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.card h3 { margin: 0 0 8px; font-size: 16px; font-weight: 600; line-height: 1.35; color: var(--text); }
.card p { margin: 0; font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.card a { text-decoration: none; color: inherit; display: block; }

/* --- TOC --- */
.toc { background: var(--bg-secondary); border: 1px solid var(--border-light); border-radius: var(--radius); padding: 20px 24px; margin: 24px 0 32px; }
.toc h4 { margin: 0 0 12px; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-tertiary); }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin-bottom: 4px; }
.toc a { font-size: 14px; color: var(--text-secondary); text-decoration: none; display: block; padding: 3px 0; border-radius: 4px; transition: color var(--transition); }
.toc a:hover { color: var(--primary); }

/* --- Blockquote --- */
blockquote { border-left: 3px solid var(--primary); padding: 12px 20px; margin: 24px 0; background: var(--primary-light); border-radius: 0 var(--radius) var(--radius) 0; font-size: 14px; color: var(--text); }
blockquote p:last-child { margin-bottom: 0; }

/* --- Code --- */
code { font-family: var(--font-mono); font-size: 13px; background: var(--bg-secondary); padding: 2px 6px; border-radius: 4px; color: var(--text); }
pre { background: var(--bg-secondary); border: 1px solid var(--border-light); border-radius: var(--radius); padding: 16px 20px; overflow-x: auto; margin: 24px 0; font-size: 13px; line-height: 1.6; }
pre code { background: none; padding: 0; }

/* --- HR --- */
hr { border: none; border-top: 1px solid var(--border); margin: 40px 0; }
strong { font-weight: 600; }
em { font-style: italic; }

/* --- CTA Box --- */
.cta-box { background: var(--primary-light); border: 1px solid rgba(26,86,219,0.15); border-radius: var(--radius-lg); padding: 28px 32px; margin: 48px 0 0; text-align: center; }
.cta-box h3 { margin: 0 0 8px; font-size: 20px; color: var(--text); }
.cta-box p { color: var(--text-secondary); margin-bottom: 20px; }
.btn-primary { display: inline-block; background: var(--primary); color: #fff; text-decoration: none; padding: 12px 28px; border-radius: var(--radius); font-weight: 600; font-size: 15px; transition: background var(--transition); }
.btn-primary:hover { background: var(--primary-hover); color: #fff; }

/* --- Responsive --- */
@media (max-width: 768px) {
  :root { --max-width: 100%; }
  body { font-size: 14px; }
  h1 { font-size: 26px; }
  h2 { font-size: 20px; margin-top: 36px; }
  h3 { font-size: 18px; }
  .card-grid { grid-template-columns: 1fr; }
  .site-nav { gap: 16px; }
  .site-nav a { font-size: 13px; }
  .container { padding: 0 16px; }
  main { padding: 32px 0 60px; }
  table { font-size: 12px; }
  th, td { padding: 8px 10px; }
  .cta-box { padding: 20px; }
}
@media (max-width: 480px) {
  .site-nav { display: none; }
  h1 { font-size: 22px; }
  .card-grid { gap: 12px; }
  .card { padding: 16px; }
}
@media print {
  .site-header, .site-footer, .site-nav, .breadcrumbs { display: none; }
  body { font-size: 12pt; color: #000; background: #fff; }
  a { color: #000; text-decoration: none; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 10pt; color: #666; }
  .card { break-inside: avoid; border: 1px solid #ccc; }
}