/* ABACUS Docs – Shared Stylesheet */
:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --accent: #34a853;
  --bg: #f8f9fa;
  --surface: #ffffff;
  --text: #202124;
  --text-secondary: #5f6368;
  --border: #dadce0;
  --code-bg: #f1f3f4;
  --nav-bg: #1a2233;
  --nav-text: #e8eaed;
  --shadow: 0 1px 3px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,.12);
  --radius: 8px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Top nav */
.topnav {
  background: var(--nav-bg); color: var(--nav-text);
  padding: .75rem 1.5rem; display: flex; align-items: center;
  gap: 1.5rem; flex-wrap: wrap; position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow);
}
.topnav .brand { font-weight: 700; font-size: 1.15rem; color: #fff; }
.topnav a { color: var(--nav-text); font-size: .9rem; }
.topnav a:hover { color: #fff; text-decoration: none; }

/* Breadcrumbs */
.breadcrumbs {
  padding: .5rem 1.5rem; font-size: .85rem; color: var(--text-secondary);
  background: var(--surface); border-bottom: 1px solid var(--border);
}
.breadcrumbs a { color: var(--primary); }
.breadcrumbs span { margin: 0 .35rem; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #1a2233 0%, #1a73e8 100%);
  color: #fff; padding: 3rem 1.5rem; text-align: center;
}
.hero h1 { margin: 0 0 .5rem; font-size: 2.2rem; }
.hero p { margin: 0; opacity: .9; max-width: 700px; margin-inline: auto; }

/* Container */
.container { max-width: 1100px; margin: 0 auto; padding: 1.5rem; }

/* Cards */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem; margin: 1.5rem 0;
}
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem;
  box-shadow: var(--shadow); transition: box-shadow .2s, transform .2s;
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.card h3 { margin: 0 0 .5rem; font-size: 1.1rem; }
.card p { margin: 0 0 .75rem; color: var(--text-secondary); font-size: .92rem; }
.card .btn { display: inline-block; background: var(--primary); color: #fff; padding: .45rem 1rem; border-radius: 4px; font-size: .88rem; }
.card .btn:hover { background: var(--primary-dark); text-decoration: none; }

/* Status badges */
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 12px;
  font-size: .78rem; font-weight: 600; text-transform: uppercase;
}
.badge-ok { background: #e6f4ea; color: #137333; }
.badge-warn { background: #fef7e0; color: #b05e0a; }
.badge-err { background: #fce8e6; color: #c5221f; }
.badge-info { background: #e8f0fe; color: #1a73e8; }

/* Tables */
table { width: 100%; border-collapse: collapse; margin: 1rem 0; background: var(--surface); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
th, td { padding: .65rem .9rem; text-align: left; border-bottom: 1px solid var(--border); font-size: .92rem; }
th { background: var(--code-bg); font-weight: 600; }

/* Code */
code { background: var(--code-bg); padding: 2px 6px; border-radius: 4px; font-size: .88em; }
pre { background: var(--nav-bg); color: #e8eaed; padding: 1rem; border-radius: var(--radius); overflow-x: auto; }
pre code { background: transparent; padding: 0; color: inherit; }

/* Section */
.section { margin: 2rem 0; }
.section h2 { border-bottom: 2px solid var(--primary); padding-bottom: .4rem; }

/* Footer */
.footer {
  background: var(--nav-bg); color: var(--nav-text); text-align: center;
  padding: 1.5rem; margin-top: 3rem; font-size: .85rem;
}
.footer a { color: #8ab4f8; }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.6rem; }
  .card-grid { grid-template-columns: 1fr; }
  .topnav { gap: .75rem; }
  .container { padding: 1rem; }
}