/* ============================================================
   SchemaForAI.dev - Structured Data & Web Standards Resource
   Design System
   ============================================================ */

/* Reset & Variables */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root {
  /* Colors */
  --ink: #0f172a;
  --body: #334155;
  --muted: #64748b;
  --accent: #7c3aed;
  --accent-light: #8b5cf6;
  --accent-bg: #f5f3ff;
  --accent-border: #ddd6fe;
  --green: #059669;
  --green-bg: #ecfdf5;
  --green-border: #a7f3d0;
  --red: #dc2626;
  --red-bg: #fef2f2;
  --red-border: #fecaca;
  --yellow: #d97706;
  --yellow-bg: #fef3c7;
  --yellow-border: #fde68a;
  --blue: #2563eb;
  --blue-bg: #eff6ff;
  --blue-border: #bfdbfe;
  --bg: #ffffff;
  --bg2: #f8fafc;
  --bg3: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  /* Code */
  --code-bg: #1e293b;
  --code-fg: #e2e8f0;
  --code-comment: #64748b;
  --code-keyword: #c084fc;
  --code-string: #34d399;
  --code-number: #fbbf24;
  --code-property: #60a5fa;
  --code-tag: #f472b6;
  --code-attr: #fbbf24;

  /* Layout */
  --radius: 8px;
  --radius-lg: 12px;
  --max: 800px;
  --max-wide: 1100px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', Consolas, monospace;
}

/* Base Typography */
body {
  font-family: var(--font-sans);
  color: var(--body);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--ink);
  line-height: 1.3;
  font-weight: 700;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(124,58,237,.25);
  transition: border-color .2s, color .2s;
}
a:hover {
  border-bottom-color: var(--accent);
  color: var(--accent-light);
}

img { max-width: 100%; height: auto; }

/* ============================================================
   Header / Navigation
   ============================================================ */
header.top-bar {
  background: var(--ink);
  color: var(--code-fg);
  padding: 0;
  font-size: .85rem;
  border-bottom: 3px solid var(--accent);
  position: sticky;
  top: 0;
  z-index: 100;
}
header.top-bar .inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
}
header.top-bar .brand {
  font-weight: 800;
  font-size: 1.05rem;
  color: #fff;
  letter-spacing: -.02em;
  border: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
header.top-bar .brand:hover { color: #fff; }
header.top-bar .brand span { color: var(--accent-light); }
header.top-bar .brand .brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--accent);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  color: #fff;
}
header.top-bar nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
header.top-bar nav a {
  color: #94a3b8;
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: .84rem;
  transition: color .2s, background .2s;
}
header.top-bar nav a:hover {
  color: #fff;
  background: rgba(255,255,255,.08);
}
header.top-bar nav a.active {
  color: #fff;
  background: rgba(124,58,237,.25);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 4px;
}

/* ============================================================
   Breadcrumbs
   ============================================================ */
.breadcrumbs {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px 0;
  font-size: .82rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumbs a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color .2s, border-color .2s;
}
.breadcrumbs a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.breadcrumbs .sep {
  color: var(--border-strong);
  font-size: .75rem;
  user-select: none;
}
.breadcrumbs .current {
  color: var(--ink);
  font-weight: 500;
}

/* ============================================================
   Page Layout
   ============================================================ */
.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 24px 80px;
}
.page h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 12px;
  letter-spacing: -.03em;
  line-height: 1.2;
}
.page .meta {
  color: var(--muted);
  font-size: .85rem;
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.page .meta .tag {
  display: inline-block;
  background: var(--accent-bg);
  color: var(--accent);
  font-size: .75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: .03em;
}
.page h2 {
  font-size: 1.5rem;
  margin: 52px 0 16px;
  padding-top: 24px;
  border-top: 2px solid var(--border);
}
.page h2:first-of-type {
  margin-top: 32px;
}
.page h3 {
  font-size: 1.15rem;
  margin: 32px 0 12px;
}
.page h4 {
  font-size: 1rem;
  margin: 24px 0 8px;
}
.page p {
  margin-bottom: 18px;
}
.page ul, .page ol {
  margin: 0 0 20px 24px;
}
.page li {
  margin-bottom: 8px;
}
.page li > ul, .page li > ol {
  margin-top: 8px;
}

/* ============================================================
   Code Blocks
   ============================================================ */
pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 20px 24px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 24px 0;
  font-size: .85rem;
  line-height: 1.65;
  border: 1px solid rgba(255,255,255,.06);
  position: relative;
}
pre::before {
  content: attr(data-lang);
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: .7rem;
  color: var(--code-comment);
  text-transform: uppercase;
  font-family: var(--font-mono);
  letter-spacing: .05em;
}
code {
  font-family: var(--font-mono);
  font-size: .88em;
}
p code, li code, td code, .tip code, .warn code, .info code {
  background: var(--bg3);
  color: var(--ink);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: .84em;
  border: 1px solid var(--border);
}

/* Syntax highlighting classes */
.code-keyword { color: var(--code-keyword); }
.code-string { color: var(--code-string); }
.code-number { color: var(--code-number); }
.code-property { color: var(--code-property); }
.code-comment { color: var(--code-comment); font-style: italic; }
.code-tag { color: var(--code-tag); }
.code-attr { color: var(--code-attr); }

/* ============================================================
   Callout Boxes (Tip, Warning, Info)
   ============================================================ */
.tip, .warn, .info {
  border-radius: var(--radius);
  padding: 18px 22px;
  margin: 28px 0;
  font-size: .93rem;
  line-height: 1.6;
  position: relative;
  padding-left: 52px;
}
.tip::before, .warn::before, .info::before {
  position: absolute;
  left: 18px;
  top: 18px;
  font-size: 1.1rem;
  line-height: 1;
}

.tip {
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
}
.tip::before { content: "\1F4A1"; }
.tip strong { color: var(--accent); }

.warn {
  background: var(--yellow-bg);
  border: 1px solid var(--yellow-border);
}
.warn::before { content: "\26A0\FE0F"; }
.warn strong { color: var(--yellow); }

.info {
  background: var(--blue-bg);
  border: 1px solid var(--blue-border);
}
.info::before { content: "\2139\FE0F"; }
.info strong { color: var(--blue); }

/* ============================================================
   Tables
   ============================================================ */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: .88rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
th, td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
th {
  font-weight: 600;
  background: var(--bg2);
  color: var(--ink);
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .03em;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg2); }

/* ============================================================
   Checklist
   ============================================================ */
.checklist {
  list-style: none;
  padding: 0;
  margin: 20px 0;
}
.checklist li {
  padding: 10px 0 10px 32px;
  position: relative;
  border-bottom: 1px solid var(--border);
}
.checklist li:last-child { border-bottom: none; }
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background: var(--green);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='white'%3E%3Cpath d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z'/%3E%3C/svg%3E");
}

/* ============================================================
   Tool Cards
   ============================================================ */
.tool-grid {
  display: grid;
  gap: 20px;
  margin: 32px 0;
}
.tool {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  background: var(--bg);
  transition: border-color .2s, box-shadow .2s;
}
.tool:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(124,58,237,.08);
}
.tool h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}
.tool .label {
  display: inline-block;
  font-size: .72rem;
  padding: 3px 10px;
  border-radius: 4px;
  margin-bottom: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}
.tool .label { background: var(--accent); color: #fff; }
.tool .label-free { background: var(--green); color: #fff; }
.tool .label-freemium { background: var(--blue); color: #fff; }
.tool .label-paid { background: var(--yellow); color: #fff; }
.tool p {
  font-size: .9rem;
  color: var(--body);
  margin-bottom: 12px;
}
.tool a {
  font-size: .85rem;
  font-weight: 500;
}

/* ============================================================
   FAQ Section
   ============================================================ */
.faq-section {
  margin: 40px 0;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-item summary {
  padding: 16px 20px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  background: var(--bg2);
  transition: background .2s;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--muted);
  transition: transform .2s;
}
.faq-item[open] summary::after {
  content: "-";
}
.faq-item summary:hover { background: var(--bg3); }
.faq-item .faq-answer {
  padding: 16px 20px;
  font-size: .93rem;
  line-height: 1.7;
  border-top: 1px solid var(--border);
}
.faq-item .faq-answer p:last-child { margin-bottom: 0; }

/* ============================================================
   Footer
   ============================================================ */
footer {
  background: var(--ink);
  color: #94a3b8;
  padding: 48px 24px 32px;
  font-size: .85rem;
  margin-top: 40px;
}
footer .footer-inner {
  max-width: var(--max-wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}
footer h4 {
  color: #fff;
  font-size: .9rem;
  margin-bottom: 16px;
  font-weight: 600;
}
footer p {
  margin-bottom: 10px;
  line-height: 1.6;
}
footer a {
  color: var(--accent-light);
  border: none;
  transition: color .2s;
}
footer a:hover { color: #fff; }
footer .footer-nav {
  list-style: none;
  padding: 0;
}
footer .footer-nav li {
  margin-bottom: 8px;
}
footer .footer-nav a {
  color: #94a3b8;
  font-size: .84rem;
}
footer .footer-nav a:hover { color: #fff; }
footer .footer-bottom {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 24px;
  margin-top: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: .8rem;
  color: #64748b;
}
footer .footer-bottom a { color: #64748b; }
footer .footer-bottom a:hover { color: #94a3b8; }
footer .trust-signals {
  display: flex;
  gap: 16px;
  align-items: center;
  font-size: .78rem;
  color: #64748b;
}

/* ============================================================
   404 Page
   ============================================================ */
.error-page {
  text-align: center;
  padding: 80px 24px 120px;
  max-width: 600px;
  margin: 0 auto;
}
.error-page pre {
  text-align: left;
  display: inline-block;
  margin: 32px auto;
}
.error-page h1 {
  font-size: 4rem;
  color: var(--accent);
  margin-bottom: 12px;
  font-family: var(--font-mono);
}
.error-page p {
  font-size: 1.1rem;
  margin-bottom: 24px;
}
.error-page .btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 28px;
  border-radius: var(--radius);
  border: none;
  font-weight: 600;
  font-size: .95rem;
  transition: background .2s;
}
.error-page .btn:hover {
  background: var(--accent-light);
  color: #fff;
}

/* ============================================================
   Hero (homepage)
   ============================================================ */
.hero-intro {
  background: linear-gradient(135deg, var(--ink) 0%, #1e1b4b 100%);
  color: #e2e8f0;
  padding: 64px 24px 56px;
  margin-bottom: 0;
}
.hero-intro .inner {
  max-width: var(--max);
  margin: 0 auto;
}
.hero-intro h1 {
  color: #fff;
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  margin-bottom: 16px;
  letter-spacing: -.03em;
}
.hero-intro p {
  font-size: 1.1rem;
  line-height: 1.7;
  color: #cbd5e1;
  max-width: 640px;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  header.top-bar .inner {
    flex-wrap: wrap;
    gap: 8px;
  }
  header.top-bar nav {
    gap: 2px;
  }
  header.top-bar nav a {
    padding: 5px 8px;
    font-size: .78rem;
  }
  .page {
    padding: 32px 16px 48px;
  }
  pre {
    padding: 16px 14px;
    font-size: .78rem;
    border-radius: 6px;
  }
  .tip, .warn, .info {
    padding-left: 16px;
  }
  .tip::before, .warn::before, .info::before {
    display: none;
  }
  table {
    font-size: .8rem;
  }
  th, td {
    padding: 8px 10px;
  }
  .tool-grid {
    gap: 12px;
  }
  .tool {
    padding: 16px;
  }
  footer .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  footer .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .breadcrumbs {
    padding: 12px 16px 0;
    font-size: .78rem;
  }
}

@media (max-width: 480px) {
  .page h1 {
    font-size: 1.5rem;
  }
  header.top-bar nav a {
    padding: 4px 6px;
    font-size: .74rem;
  }
}

/* ============================================================
   Print Styles
   ============================================================ */
@media print {
  header.top-bar, footer, .breadcrumbs { display: none; }
  .page { padding: 0; max-width: 100%; }
  pre { border: 1px solid #ccc; background: #f9f9f9; color: #333; }
  a { color: #333; border-bottom: none; }
  a::after { content: " (" attr(href) ")"; font-size: .8em; color: #666; }
}