:root {
  --bg: oklch(98% 0.006 80);
  --bg-alt: oklch(96% 0.008 80);
  --fg: oklch(20% 0.012 80);
  --muted: oklch(46% 0.02 80);
  --muted-light: oklch(60% 0.015 80);
  --border: oklch(89% 0.012 80);
  --card: oklch(99% 0.004 80);
  --accent: oklch(56% 0.16 35);
  --accent-fg: oklch(99% 0.01 35);
  --code-bg: oklch(22% 0.014 80);
  --code-fg: oklch(90% 0.02 80);
  --code-muted: oklch(60% 0.02 80);
  --code-accent: oklch(50% 0.14 35);
  --pros-bg: oklch(95% 0.03 145);
  --pros-border: oklch(85% 0.06 145);
  --pros-fg: oklch(35% 0.1 145);
  --cons-bg: oklch(95% 0.03 20);
  --cons-border: oklch(85% 0.06 20);
  --cons-fg: oklch(40% 0.1 20);
}

:root[data-theme="dark"] {
  --bg: oklch(15% 0.012 80);
  --bg-alt: oklch(18% 0.014 80);
  --fg: oklch(93% 0.008 80);
  --muted: oklch(66% 0.02 80);
  --muted-light: oklch(52% 0.018 80);
  --border: oklch(28% 0.016 80);
  --card: oklch(19% 0.015 80);
  --accent: oklch(72% 0.15 35);
  --accent-fg: oklch(18% 0.03 35);
  --code-bg: oklch(11% 0.012 80);
  --code-fg: oklch(88% 0.02 80);
  --code-muted: oklch(55% 0.02 80);
  --code-accent: oklch(75% 0.13 35);
  --pros-bg: oklch(24% 0.04 145);
  --pros-border: oklch(34% 0.06 145);
  --pros-fg: oklch(80% 0.09 145);
  --cons-bg: oklch(24% 0.04 20);
  --cons-border: oklch(34% 0.06 20);
  --cons-fg: oklch(82% 0.08 20);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: oklch(15% 0.012 80);
    --bg-alt: oklch(18% 0.014 80);
    --fg: oklch(93% 0.008 80);
    --muted: oklch(66% 0.02 80);
    --muted-light: oklch(52% 0.018 80);
    --border: oklch(28% 0.016 80);
    --card: oklch(19% 0.015 80);
    --accent: oklch(72% 0.15 35);
    --accent-fg: oklch(18% 0.03 35);
    --code-bg: oklch(11% 0.012 80);
    --code-fg: oklch(88% 0.02 80);
    --code-muted: oklch(55% 0.02 80);
    --code-accent: oklch(75% 0.13 35);
    --pros-bg: oklch(24% 0.04 145);
    --pros-border: oklch(34% 0.06 145);
    --pros-fg: oklch(80% 0.09 145);
    --cons-bg: oklch(24% 0.04 20);
    --cons-border: oklch(34% 0.06 20);
    --cons-fg: oklch(82% 0.08 20);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  transition: background 0.2s ease, color 0.2s ease;
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

a { color: inherit; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 28px;
}
.brand { display: flex; flex-direction: column; text-decoration: none; }
.brand .name { font-family: "IBM Plex Serif", serif; font-weight: 700; font-size: 20px; letter-spacing: -0.01em; }
.brand .sub { font-family: "IBM Plex Mono", monospace; font-size: 10.5px; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; }
nav.site-nav { display: flex; align-items: center; gap: 28px; }
nav.site-nav a { text-decoration: none; font-size: 14.5px; font-weight: 500; color: var(--muted); }
nav.site-nav a.active { color: var(--fg); font-weight: 600; border-bottom: 2px solid var(--accent); padding-bottom: 3px; }
.nav-divider { width: 1px; height: 18px; background: var(--border); }
.icon-btn {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  color: var(--muted);
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}
.icon-btn:hover { color: var(--fg); border-color: var(--muted); }

main.container { padding-top: 0; padding-bottom: 3rem; min-height: 60vh; }

/* hero */
.hero { max-width: 1120px; margin: 0 auto; padding: 72px 28px 56px; }
.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero h1 {
  font-family: "IBM Plex Serif", serif;
  font-weight: 600;
  font-size: 56px;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
  max-width: 16ch;
}
.hero p.lede { font-size: 18px; line-height: 1.7; color: var(--muted); max-width: 46ch; margin: 0 0 32px; }
.hero-actions { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  font-weight: 600;
  font-size: 15px;
  padding: 13px 24px;
  border-radius: 8px;
  text-decoration: none;
}
.hero-stat { font-family: "IBM Plex Mono", monospace; font-size: 13px; color: var(--muted); }

/* section labels */
.section-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 14px;
}
section.block { padding: 0 0 56px; }
.section-heading-row { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 24px; }
.section-heading-row h2 { font-family: "IBM Plex Serif", serif; font-weight: 600; font-size: 26px; margin: 0; }
.link-arrow { font-size: 14px; font-weight: 600; color: var(--accent); text-decoration: none; }

/* featured card */
.featured-card {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  align-items: center;
  text-decoration: none;
  color: var(--fg);
}
.featured-card h2 { font-family: "IBM Plex Serif", serif; font-weight: 600; font-size: 32px; line-height: 1.2; margin: 0 0 12px; }
.featured-card .tagline { font-size: 16px; line-height: 1.65; color: var(--muted); margin: 0 0 22px; }
.featured-stats { display: flex; flex-wrap: wrap; gap: 18px; font-family: "IBM Plex Mono", monospace; font-size: 12.5px; color: var(--muted); }
.featured-cta { margin-top: 26px; font-weight: 600; font-size: 14.5px; color: var(--accent); }
.featured-code {
  background: var(--code-bg);
  border-radius: 12px;
  padding: 24px 26px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 13px;
  line-height: 1.85;
  color: var(--code-fg);
  overflow: hidden;
}
.featured-code .dim { color: var(--code-muted); }
.featured-code .accent { color: var(--code-accent); }

/* pills / badges */
.pill {
  display: inline-block;
  font-size: 13.5px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
}
.pill-sm { font-size: 11.5px; padding: 3px 9px; }
.pill-all {
  background: var(--accent);
  color: var(--accent-fg);
}
.pill-fork { font-size: 11px; color: var(--muted-light); font-family: "IBM Plex Mono", monospace; }

/* card grid */
.skill-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.skill-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  border-radius: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--fg);
  transition: border-color 0.15s ease;
}
.skill-card:hover { border-color: var(--accent); }
.skill-card .badges { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.skill-card h3 { font-family: "IBM Plex Serif", serif; font-weight: 600; font-size: 19px; margin: 0 0 8px; line-height: 1.3; }
.skill-card p { font-size: 14px; line-height: 1.6; color: var(--muted); margin: 0 0 18px; flex: 1; }
.skill-card .stats {
  display: flex; flex-wrap: wrap; gap: 12px;
  font-family: "IBM Plex Mono", monospace; font-size: 11.5px; color: var(--muted-light);
  border-top: 1px solid var(--border); padding-top: 12px;
}

/* listing page */
.list-header { padding: 48px 0 8px; }
.list-header h1 { font-family: "IBM Plex Serif", serif; font-weight: 600; font-size: 36px; margin: 0 0 8px; }
.list-header .count { color: var(--muted); font-size: 14px; }
.filter-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0; }
.filter-controls { display: flex; gap: 16px; margin-bottom: 32px; flex-wrap: wrap; }
.search-input {
  flex: 1; min-width: 220px;
  padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--card); color: var(--fg); font-size: 14px; font-family: inherit;
}
.sort-select {
  padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--card); color: var(--fg); font-size: 14px; font-family: inherit;
}

/* breadcrumb */
.breadcrumb { padding: 24px 0 0; font-size: 13.5px; color: var(--muted); }
.breadcrumb a { text-decoration: none; color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 8px; }

/* detail page */
.detail-layout { display: grid; grid-template-columns: 1fr 280px; gap: 48px; padding: 24px 0 24px; align-items: start; }
.detail-main .badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 20px; }
.detail-main h1 { font-family: "IBM Plex Serif", serif; font-weight: 600; font-size: 38px; margin: 0 0 12px; }
.detail-main .tagline { font-size: 17px; color: var(--muted); margin: 0 0 8px; }
.detail-section { margin-top: 40px; }
.detail-section h2 { font-family: "IBM Plex Serif", serif; font-weight: 600; font-size: 21px; margin: 0 0 16px; }
.detail-section p { margin: 0 0 12px; }
.detail-section ol.step-list { margin: 0; padding-left: 20px; }
.detail-section ol.step-list li { margin-bottom: 8px; }
code.inline-code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.9em;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1em 0.4em;
}
.code-block { position: relative; margin: 16px 0; }
.code-block pre {
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 10px;
  padding: 16px 60px 16px 18px;
  overflow-x: auto;
  font-family: "IBM Plex Mono", monospace;
  font-size: 13.5px;
  line-height: 1.6;
  margin: 0;
}
.copy-btn {
  position: absolute; top: 10px; right: 10px;
  background: rgba(255, 255, 255, 0.12);
  color: var(--code-fg);
  border: none; border-radius: 6px;
  padding: 5px 10px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  cursor: pointer;
}
.copy-btn:hover { background: rgba(255, 255, 255, 0.22); }
.copy-btn.copied .copy-label::after { content: " ✓"; }

.pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 16px; }
.pros-cons .box { border-radius: 12px; padding: 20px 22px; border: 1px solid; }
.pros-cons .box.pros { background: var(--pros-bg); border-color: var(--pros-border); color: var(--pros-fg); }
.pros-cons .box.cons { background: var(--cons-bg); border-color: var(--cons-border); color: var(--cons-fg); }
.pros-cons .box-label { font-weight: 700; font-size: 13.5px; text-transform: uppercase; letter-spacing: 0.04em; margin-bottom: 10px; }
.pros-cons ul { margin: 0; padding-left: 18px; }
.pros-cons li { margin-bottom: 8px; }

.comparison-quote {
  border-left: 3px solid var(--accent);
  padding: 4px 0 4px 18px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 0; cursor: pointer; font-weight: 600; font-size: 15px;
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: 18px; color: var(--muted); font-weight: 400; }
.faq-item[open] summary::after { content: "\2212"; }
.faq-item .faq-answer { padding: 0 0 18px; color: var(--muted); font-size: 14.5px; line-height: 1.7; }

/* sidebar */
.sidebar-card { border: 1px solid var(--border); border-radius: 12px; padding: 20px; background: var(--card); position: sticky; top: 90px; }
.sidebar-card .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }
.sidebar-card .repo-name { font-family: "IBM Plex Mono", monospace; font-weight: 600; color: var(--accent); font-size: 14.5px; word-break: break-all; margin-bottom: 16px; }
.sidebar-stat { display: flex; justify-content: space-between; font-size: 13.5px; padding: 8px 0; border-top: 1px solid var(--border); }
.sidebar-stat .k { color: var(--muted); }
.sidebar-stat .v { font-weight: 600; }
.sidebar-cta {
  display: block; text-align: center; margin-top: 16px;
  background: var(--accent); color: var(--accent-fg); font-weight: 600;
  padding: 11px; border-radius: 8px; text-decoration: none; font-size: 14px;
}

@media (max-width: 860px) {
  .detail-layout { grid-template-columns: 1fr; }
  .featured-card { grid-template-columns: 1fr; }
  .pros-cons { grid-template-columns: 1fr; }
  .hero h1 { font-size: 38px; }
}

.empty-state { color: var(--muted); padding: 3rem 0; }

.site-footer { border-top: 1px solid var(--border); }
.site-footer .container { padding: 36px 28px; display: flex; flex-direction: column; gap: 14px; }
.site-footer .name { font-family: "IBM Plex Serif", serif; font-weight: 700; font-size: 16px; }
.site-footer p { font-size: 13.5px; line-height: 1.7; color: var(--muted); max-width: 60ch; margin: 0; }