/* DAPE Base Styles - Tailwind-inspired utility classes + custom */
:root {
  --color-primary: #1e3a5f;
  --color-primary-light: #2c5282;
  --color-accent: #3182ce;
  --color-bg: #f7fafc;
  --color-text: #1a202c;
  --color-muted: #4a5568;
  --color-border: #e2e8f0;
  --color-success: #276749;
  --color-warning: #c05621;
  --color-danger: #c53030;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 72rem;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* Layout */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1.25rem; }
.main { flex: 1; padding: 2rem 0; }
.section { margin-bottom: 3rem; }

/* Header */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 0; gap: 1rem; }
.logo { font-weight: 700; font-size: 1.25rem; color: var(--color-primary); text-decoration: none; }
.logo:hover { text-decoration: none; color: var(--color-primary-light); }
.nav { display: flex; gap: 1.25rem; flex-wrap: wrap; align-items: center; }
.nav a { color: var(--color-muted); font-size: 0.95rem; font-weight: 500; }
.nav a:hover { color: var(--color-primary); text-decoration: none; }
.nav-toggle { display: none; background: none; border: 1px solid var(--color-border); padding: 0.4rem 0.6rem; border-radius: 0.25rem; cursor: pointer; }

/* Breadcrumbs */
.breadcrumbs { font-size: 0.875rem; color: var(--color-muted); margin-bottom: 1.5rem; }
.breadcrumbs a { color: var(--color-muted); }
.breadcrumbs span { margin: 0 0.35rem; }

/* Typography */
h1 { font-size: 2rem; line-height: 1.25; margin-bottom: 1rem; color: var(--color-primary); }
h2 { font-size: 1.5rem; margin: 2rem 0 1rem; color: var(--color-primary); }
h3 { font-size: 1.2rem; margin: 1.5rem 0 0.75rem; }
p { margin-bottom: 1rem; }
ul, ol { margin: 0 0 1rem 1.5rem; }
li { margin-bottom: 0.4rem; }
.lead { font-size: 1.15rem; color: var(--color-muted); margin-bottom: 1.5rem; }

/* Cards & Hubs */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; }
.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 1.25rem;
  transition: box-shadow 0.15s;
}
.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.card h3 { margin-top: 0; font-size: 1.1rem; }
.card p { font-size: 0.95rem; color: var(--color-muted); margin-bottom: 0.75rem; }
.card a { font-weight: 500; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #1e3a5f 0%, #2c5282 100%);
  color: #fff;
  padding: 3rem 0;
  margin-bottom: 2.5rem;
}
.hero h1 { color: #fff; font-size: 2.25rem; }
.hero .lead { color: rgba(255,255,255,0.9); }
.hero a { color: #fff; text-decoration: underline; }

/* Callouts */
.callout {
  border-left: 4px solid var(--color-accent);
  background: #ebf8ff;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 0.25rem 0.25rem 0;
}
.callout.warning { border-color: var(--color-warning); background: #fffaf0; }
.callout.danger { border-color: var(--color-danger); background: #fff5f5; }
.callout.success { border-color: var(--color-success); background: #f0fff4; }
.callout strong { display: block; margin-bottom: 0.25rem; }

/* Tables */
table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.95rem; }
th, td { border: 1px solid var(--color-border); padding: 0.65rem 0.85rem; text-align: left; }
th { background: #edf2f7; font-weight: 600; }
tr:nth-child(even) { background: #f7fafc; }

/* Diagram containers */
.diagram {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin: 1.5rem 0;
  text-align: center;
}
.diagram figcaption { font-size: 0.875rem; color: var(--color-muted); margin-top: 0.75rem; }

/* Footer */
.site-footer {
  background: #1a202c;
  color: #a0aec0;
  padding: 2.5rem 0 1.5rem;
  margin-top: auto;
  font-size: 0.9rem;
}
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.footer-grid h4 { color: #e2e8f0; margin-bottom: 0.75rem; font-size: 0.95rem; }
.footer-grid a { color: #a0aec0; display: block; margin-bottom: 0.35rem; }
.footer-grid a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #2d3748; padding-top: 1.25rem; text-align: center; font-size: 0.85rem; }
.disclaimer { font-size: 0.8rem; color: #718096; max-width: 48rem; margin: 0 auto 1rem; }

/* Meta & TOC */
.meta { font-size: 0.875rem; color: var(--color-muted); margin-bottom: 1.5rem; }
.toc { background: #fff; border: 1px solid var(--color-border); border-radius: 0.5rem; padding: 1rem 1.25rem; margin-bottom: 2rem; }
.toc h2 { font-size: 1rem; margin: 0 0 0.75rem; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin-bottom: 0.35rem; }
.toc a { font-size: 0.95rem; }

/* Search placeholder */
.search-box {
  display: flex;
  gap: 0.5rem;
  max-width: 28rem;
  margin: 1rem 0;
}
.search-box input {
  flex: 1;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: 0.375rem;
  font-size: 1rem;
}
.search-box button {
  padding: 0.6rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 0.375rem;
  cursor: pointer;
  font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
  .nav { display: none; }
  .nav.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: #fff; padding: 1rem; border-bottom: 1px solid var(--color-border); }
  .nav-toggle { display: block; }
  h1 { font-size: 1.75rem; }
  .hero { padding: 2rem 0; }
  .hero h1 { font-size: 1.75rem; }
}

/* Utility */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-2 { margin-bottom: 2rem; }
.btn {
  display: inline-block;
  padding: 0.65rem 1.25rem;
  background: var(--color-primary);
  color: #fff !important;
  border-radius: 0.375rem;
  font-weight: 500;
  text-decoration: none !important;
}
.btn:hover { background: var(--color-primary-light); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary) !important;
}
.btn-outline:hover { background: var(--color-primary); color: #fff !important; }