/* ============================================================
   best-practices.css — Well-Architected AI Best Practices page
   ============================================================ */

:root {
  --bg: oklch(0.975 0.006 85);
  --ink: oklch(0.18 0.014 60);
  --muted: oklch(0.46 0.02 60);
  --faint: oklch(0.60 0.02 60);
  --panel: oklch(0.955 0.008 85);
  --panel-2: oklch(0.925 0.010 80);
  --line: oklch(0.88 0.010 75);
  --accent: oklch(0.56 0.19 28);
  --accent-soft: oklch(0.56 0.19 28 / 0.08);
  --serif: "Fraunces", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --shadow: rgba(0,0,0,0.12);
  --shadow-lg: rgba(0,0,0,0.18);
  --card-bg: oklch(0.99 0.004 85);
  --card-hover: oklch(1.0 0 0);
  --gradient-start: oklch(0.96 0.015 28);
  --gradient-end: oklch(0.97 0.010 85);
  --reliability: oklch(0.55 0.14 250);
  --security: oklch(0.55 0.16 30);
  --ops: oklch(0.55 0.14 150);
  --performance: oklch(0.55 0.16 80);
  --cost: oklch(0.55 0.14 310);
}
[data-theme="dark"] {
  --bg: oklch(0.16 0.010 60);
  --ink: oklch(0.94 0.010 85);
  --muted: oklch(0.72 0.018 75);
  --faint: oklch(0.54 0.018 70);
  --panel: oklch(0.21 0.012 60);
  --panel-2: oklch(0.26 0.014 60);
  --line: oklch(0.33 0.014 60);
  --accent: oklch(0.74 0.16 52);
  --accent-soft: oklch(0.74 0.16 52 / 0.12);
  --shadow: rgba(0,0,0,0.35);
  --shadow-lg: rgba(0,0,0,0.55);
  --card-bg: oklch(0.20 0.011 60);
  --card-hover: oklch(0.24 0.014 60);
  --gradient-start: oklch(0.22 0.018 28);
  --gradient-end: oklch(0.18 0.012 60);
  --reliability: oklch(0.65 0.14 250);
  --security: oklch(0.65 0.16 30);
  --ops: oklch(0.65 0.14 150);
  --performance: oklch(0.65 0.16 80);
  --cost: oklch(0.65 0.14 310);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
em { font-style: italic; }
.wrap { max-width: 1260px; margin: 0 auto; padding: 0 24px; }

/* ---- header ---- */
header.site {
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 30;
  border-bottom: 1px solid var(--line);
}
.bar { display: flex; align-items: center; gap: 18px; padding: 12px 24px; }
.logo { font: 600 14px var(--mono); display: inline-flex; align-items: center; gap: 6px; }
.logo b { background: var(--accent); color: var(--bg); padding: 1px 5px; border-radius: 4px; font-family: var(--mono); }
.nav-links { display: flex; gap: 4px; margin-left: 8px; }
.nav-link {
  font: 12px var(--mono); letter-spacing: .04em; text-transform: uppercase;
  padding: 6px 14px; border-radius: 8px; color: var(--muted);
  transition: color .15s, background .15s;
}
.nav-link:hover { color: var(--ink); text-decoration: none; background: var(--accent-soft); }
.nav-link.active { color: var(--ink); background: var(--panel-2); font-weight: 600; }
.src { margin-left: auto; display: flex; gap: 8px; align-items: center; }
.file-btn {
  cursor: pointer; border: 1px solid var(--line); background: var(--panel);
  padding: 7px 12px; border-radius: 8px; font: 13px var(--mono); color: var(--muted);
  transition: border-color .15s, color .15s;
}
.file-btn:hover { border-color: var(--accent); color: var(--ink); }

/* ---- hero ---- */
.hero { padding: 50px 0 0; }
.hero .wrap {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 16px; padding: 44px 40px 36px;
  border: 1px solid var(--line);
}
.eyebrow {
  margin: 0 0 12px; font: 11px var(--mono);
  letter-spacing: .16em; text-transform: uppercase; color: var(--faint);
}
.hero h1 {
  margin: 0; font: 400 clamp(32px, 5.5vw, 56px)/1.04 var(--serif);
  letter-spacing: -.5px;
}
.hero h1 em { font-weight: 500; color: var(--accent); }
.lede { color: var(--muted); margin: 16px 0 28px; font-size: 15px; max-width: 640px; }
.stats { display: flex; flex-wrap: wrap; gap: 0; }
.stat {
  padding: 16px 28px 18px 0; margin-right: 28px;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: 0; }
.stat b { display: block; font: 400 32px/1 var(--serif); }
.stat span {
  font: 10px var(--mono); letter-spacing: .1em;
  text-transform: uppercase; color: var(--faint);
}

/* ---- controls ---- */
.controls {
  position: sticky; top: 53px; z-index: 25;
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.controls .wrap {
  display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
}
.controls input[type=search],
.controls select {
  background: var(--panel); color: var(--ink);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 9px 12px; font: 13px var(--sans);
  transition: border-color .15s, box-shadow .15s;
}
.controls input[type=search]:focus,
.controls select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.controls input[type=search] { flex: 1 1 260px; min-width: 220px; }
.controls select { cursor: pointer; min-width: 180px; }
.count {
  margin-left: auto; font: 11px var(--mono); color: var(--faint);
  white-space: nowrap;
}

/* ---- main ---- */
main { padding: 28px 0 80px; min-height: 50vh; }
.empty { color: var(--muted); padding: 50px 0; text-align: center; font-size: 15px; }

/* ---- pillar sections ---- */
.pillar-section { margin-bottom: 48px; }
.pillar-header {
  padding: 20px 24px;
  border-left: 4px solid var(--pillar-color);
  border-radius: 0 12px 12px 0;
  background: color-mix(in oklab, var(--pillar-color) 6%, var(--panel));
  margin-bottom: 20px;
}
.pillar-name {
  margin: 0 0 6px;
  font: 600 22px/1.2 var(--serif);
  color: var(--ink);
}
.pillar-desc {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  max-width: 700px;
}

/* ---- pattern grid ---- */
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 14px;
}

/* ---- pattern card ---- */
.pattern-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 22px 18px;
  position: relative;
  overflow: hidden;
  transition: transform .18s cubic-bezier(.22,1,.36,1),
              border-color .18s,
              box-shadow .18s;
}
.pattern-card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--pillar-color);
  opacity: 0; transition: opacity .18s;
}
.pattern-card:hover {
  border-color: var(--pillar-color);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px var(--shadow), 0 0 0 1px color-mix(in oklab, var(--pillar-color) 20%, transparent);
}
.pattern-card:hover::before { opacity: 1; }

.pattern-head { margin-bottom: 10px; }
.pattern-name {
  margin: 0 0 6px;
  font: 600 16px/1.25 var(--serif);
  color: var(--ink);
}
.pattern-summary {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.5;
}

/* ---- pattern body (expandable) ---- */
.pattern-body {
  border-top: 1px solid color-mix(in oklab, var(--line) 60%, transparent);
  padding-top: 14px;
  margin-top: 14px;
}
.pattern-body[hidden] { display: none; }
.pattern-section { margin-bottom: 14px; }
.pattern-section:last-child { margin-bottom: 0; }
.pattern-section h4 {
  margin: 0 0 4px;
  font: 10px var(--mono); letter-spacing: .1em;
  text-transform: uppercase; color: var(--faint);
}
.pattern-section p {
  margin: 0;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.55;
}

/* ---- tool pills ---- */
.pattern-tools,
.pattern-uc {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}
.pattern-tools-label,
.pattern-uc-label {
  font: 9px var(--mono); letter-spacing: .06em;
  text-transform: uppercase; color: var(--faint);
  margin-right: 2px;
}
.tool-pill {
  font: 10px var(--mono);
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--accent);
  background: var(--accent-soft);
  white-space: nowrap;
  transition: border-color .15s, background .15s;
}
.tool-pill:hover {
  border-color: var(--accent);
  background: color-mix(in oklab, var(--accent) 15%, var(--bg));
  text-decoration: none;
}
.uc-link {
  font: 10px var(--mono);
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  white-space: nowrap;
  transition: border-color .15s, color .15s;
}
.uc-link:hover {
  border-color: var(--muted);
  color: var(--ink);
  text-decoration: none;
}

/* ---- tags ---- */
.pattern-tags {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.tag {
  font: 9px var(--mono); letter-spacing: .04em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--panel-2);
  color: var(--faint);
}

/* ---- expand button ---- */
.pattern-expand {
  display: inline-block;
  margin-top: 10px;
  font: 11px var(--mono); color: var(--pillar-color, var(--accent));
  letter-spacing: .04em; text-transform: uppercase;
  cursor: pointer; border: 0; background: none; padding: 0;
}
.pattern-expand:hover { text-decoration: underline; }

/* ---- animations ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}
.pattern-card { animation: fadeUp .3s ease-out both; }

/* ---- responsive ---- */
@media (max-width: 768px) {
  .hero .wrap { padding: 32px 24px 28px; border-radius: 12px; }
  .hero h1 { font-size: clamp(26px, 8vw, 40px); }
  .controls .wrap { gap: 8px; }
  .controls select { min-width: 140px; flex: 1 1 45%; }
  .controls input[type=search] { flex: 1 1 100%; }
  .pattern-grid { grid-template-columns: 1fr; }
  .stat { padding-right: 16px; margin-right: 16px; }
  .stat b { font-size: 26px; }
}
@media (max-width: 480px) {
  .nav-links { display: none; }
  .controls select { flex: 1 1 100%; }
}