/* ============================================================================
   Lean Engineering Blog : stylesheet v2
   Exact Lean tokens (globals.css): Inter + JetBrains Mono, Zinc + Green #3DD68C
   Dark + Light themes, system-default with a manual toggle override.
   ============================================================================ */

/* ---- dark (default) ---- */
:root {
  --canvas: #1c2024;
  --surface: #18181b;
  --surface-2: #202023;
  --surface-3: #26282d;
  --border: #26282d;
  --border-strong: #3f3f46;
  --text: #fafafa;
  --text-2: #9f9fa6;
  --text-3: #71717a;

  --accent: #3dd68c;        /* green-500 */
  --accent-text: #3dd68c;
  --accent-deep: #14532d;   /* green-900 */
  --accent-subtle: rgba(61, 214, 140, 0.11);
  --accent-border: rgba(61, 214, 140, 0.30);
  --glow: radial-gradient(600px 300px at 15% -10%, rgba(61,214,140,0.10), transparent 70%);

  --sky: #0ea5e9; --amber: #f59e0b; --rose: #f43f5e; --red: #ef4444;
  --code-bg: #0e0f11;
  --grid: rgba(255,255,255,0.025);
  --shadow: 0 1px 0 rgba(255,255,255,0.03), 0 18px 40px -24px rgba(0,0,0,0.7);

  --maxw: 740px; --radius: 14px; --radius-sm: 9px;
  --sans: "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) { --_light: 1; }
}
/* light token values, applied via system (no override) or explicit toggle */
:root:not([data-theme="dark"]) {
  /* placeholder; real light values below via the two selectors */
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --canvas: #fafafa; --surface: #ffffff; --surface-2: #f9f9fb; --surface-3: #f4f4f5;
    --border: #e4e4e7; --border-strong: #d4d4d8;
    --text: #09090b; --text-2: #3f3f46; --text-3: #71717a;
    --accent: #16a34a; --accent-text: #15803d; --accent-subtle: rgba(22,163,74,0.08);
    --accent-border: rgba(22,163,74,0.28);
    --glow: radial-gradient(620px 300px at 15% -10%, rgba(22,163,74,0.08), transparent 70%);
    --code-bg: #0e0f11; --grid: rgba(0,0,0,0.028);
    --shadow: 0 1px 0 rgba(0,0,0,0.02), 0 20px 40px -28px rgba(24,24,27,0.22);
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --canvas: #fafafa; --surface: #ffffff; --surface-2: #f9f9fb; --surface-3: #f4f4f5;
  --border: #e4e4e7; --border-strong: #d4d4d8;
  --text: #09090b; --text-2: #3f3f46; --text-3: #71717a;
  --accent: #16a34a; --accent-text: #15803d; --accent-subtle: rgba(22,163,74,0.08);
  --accent-border: rgba(22,163,74,0.28);
  --glow: radial-gradient(620px 300px at 15% -10%, rgba(22,163,74,0.08), transparent 70%);
  --code-bg: #0e0f11; --grid: rgba(0,0,0,0.028);
  --shadow: 0 1px 0 rgba(0,0,0,0.02), 0 20px 40px -28px rgba(24,24,27,0.22);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    var(--glow),
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 100% 56px,
    var(--canvas);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px; line-height: 1.72; letter-spacing: -0.003em;
  -webkit-font-smoothing: antialiased;
  transition: background-color .25s ease, color .25s ease;
}
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; }
::selection { background: var(--accent-subtle); }

/* ---- header ---- */
.site-header { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--canvas) 80%, transparent); backdrop-filter: saturate(140%) blur(12px); border-bottom: 1px solid var(--border); }
.nav { max-width: 1060px; margin: 0 auto; padding: 13px 24px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand .glyph { width: 28px; height: 28px; color: var(--accent); flex: none; }
.brand .wm { display: flex; flex-direction: column; line-height: 1.05; }
.brand .wm b { font-weight: 640; letter-spacing: -0.02em; font-size: 15.5px; }
.brand .wm small { color: var(--text-3); font-size: 11.5px; font-family: var(--mono); letter-spacing: 0; }
.nav-right { display: flex; align-items: center; gap: 18px; }
.nav-links { display: flex; gap: 20px; font-size: 14px; }
.nav-links a { color: var(--text-2); } .nav-links a:hover { color: var(--text); text-decoration: none; }
.theme-toggle { width: 34px; height: 34px; border-radius: 9px; border: 1px solid var(--border-strong); background: var(--surface-2); color: var(--text-2); cursor: pointer; display: grid; place-items: center; transition: border-color .15s, color .15s; }
.theme-toggle:hover { color: var(--text); border-color: var(--accent-border); }
.theme-toggle .sun { display: none; } .theme-toggle .moon { display: block; }
:root[data-theme="light"] .theme-toggle .sun, :root:not([data-theme="dark"]) .theme-toggle .sun { display: block; }
:root[data-theme="light"] .theme-toggle .moon, :root:not([data-theme="dark"]) .theme-toggle .moon { display: none; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .theme-toggle .sun { display: none; } :root:not([data-theme="light"]) .theme-toggle .moon { display: block; } }

.eyebrow { font-family: var(--mono); font-size: 11.5px; color: var(--text-3); letter-spacing: 0.02em; }
.eyebrow .on { color: var(--accent-text); }

/* ---- category pills ---- */
.pill { display: inline-flex; align-items: center; gap: 6px; font-family: var(--mono); font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.07em; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border-strong); color: var(--text-2); background: var(--surface-2); }
.pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.pill.security { color: var(--accent-text); border-color: var(--accent-border); }
.pill.devops { color: var(--sky); border-color: rgba(14,165,233,0.34); }
.pill.engineering { color: var(--amber); border-color: rgba(245,158,11,0.34); }

/* ---- home ---- */
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 24px; }
.hero { padding: 84px 0 48px; }
.hero .kick { font-family: var(--mono); font-size: 12.5px; color: var(--text-3); letter-spacing: 0.04em; margin-bottom: 20px; }
.hero .kick .on { color: var(--accent-text); }
.hero h1 { font-size: clamp(32px, 5.4vw, 52px); line-height: 1.04; letter-spacing: -0.035em; margin: 0 0 18px; font-weight: 720; max-width: 15ch; }
.hero h1 em { font-style: normal; color: var(--accent-text); }
.hero .lede { font-size: 18.5px; color: var(--text-2); max-width: 600px; margin: 0; }
.tracks { display: flex; gap: 9px; flex-wrap: wrap; margin: 30px 0 0; }

/* ---- post list ---- */
.posts { padding: 48px 0 24px; }
.section-label { display: flex; align-items: center; gap: 12px; font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.14em; color: var(--text-3); margin: 0 0 22px; }
.section-label::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.post-card { display: block; padding: 26px 28px; margin-bottom: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); transition: border-color .18s, transform .18s, box-shadow .18s; }
.post-card:hover { text-decoration: none; border-color: var(--accent-border); transform: translateY(-2px); box-shadow: var(--shadow); }
.post-card.featured { background: linear-gradient(180deg, var(--accent-subtle), var(--surface) 60%); border-color: var(--accent-border); }
.post-card .meta-row { display: flex; align-items: center; gap: 11px; flex-wrap: wrap; margin-bottom: 15px; }
.post-card h2 { font-size: 23px; line-height: 1.22; letter-spacing: -0.02em; margin: 0 0 10px; color: var(--text); font-weight: 680; }
.post-card .deck { color: var(--text-2); font-size: 15.5px; margin: 0 0 16px; }
.post-card .byline { font-size: 13px; color: var(--text-3); display: flex; gap: 10px; flex-wrap: wrap; align-items: center; font-family: var(--mono); }
.post-card .byline .dot { opacity: .5; }
.post-card .arrow { color: var(--accent-text); font-weight: 600; }
.post-card.soon { opacity: .6; pointer-events: none; }
.post-card.soon .tag-soon { font-family: var(--mono); font-size: 10.5px; color: var(--text-3); border: 1px dashed var(--border-strong); padding: 2px 8px; border-radius: 6px; }

/* ---- article ---- */
.article { max-width: var(--maxw); margin: 0 auto; padding: 0 24px 110px; }
.article-head { padding: 56px 0 28px; }
.article-head .meta-row { display: flex; gap: 11px; flex-wrap: wrap; align-items: center; margin-bottom: 22px; }
.article-head h1 { font-size: clamp(30px, 4.6vw, 42px); line-height: 1.1; letter-spacing: -0.034em; margin: 0 0 20px; font-weight: 720; }
.article-head .deck { font-size: 19.5px; color: var(--text-2); margin: 0 0 26px; line-height: 1.55; }
.article-head .byline { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; font-size: 13.5px; color: var(--text-3); padding-top: 22px; border-top: 1px solid var(--border); font-family: var(--mono); }
.article-head .byline strong { color: var(--text-2); font-weight: 500; }
.author-chip { display: inline-flex; align-items: center; gap: 8px; }
.author-chip .glyph { width: 20px; height: 20px; color: var(--accent); }
.apple-mark { width: 15px; height: 18px; color: var(--text-2); vertical-align: -3px; margin-right: 2px; }

.article h2 { font-size: 27px; line-height: 1.18; letter-spacing: -0.025em; margin: 56px 0 16px; font-weight: 700; scroll-margin-top: 80px; }
.article h2 .num { color: var(--accent-text); font-family: var(--mono); font-size: 15px; font-weight: 600; margin-right: 12px; opacity: .85; }
.article h3 { font-size: 19.5px; margin: 36px 0 10px; font-weight: 640; letter-spacing: -0.012em; }
.article p { margin: 17px 0; }
.article ul, .article ol { margin: 17px 0; padding-left: 22px; }
.article li { margin: 9px 0; }
.article strong { color: var(--text); font-weight: 630; }
.article hr { border: none; border-top: 1px solid var(--border); margin: 52px 0; }
.article .lead { font-size: 19.5px; color: var(--text-2); line-height: 1.6; }

code { font-family: var(--mono); font-size: 0.86em; background: var(--surface-3); padding: 2px 6px; border-radius: 5px; color: var(--accent-text); border: 1px solid var(--border); }
.article pre { background: var(--code-bg); border: 1px solid #202126; border-radius: var(--radius-sm); padding: 16px 18px; overflow-x: auto; margin: 10px 0 24px; line-height: 1.55; box-shadow: var(--shadow); }
.article pre code { background: none; padding: 0; border: none; font-size: 12.8px; color: #c6c8cc; }
.code-tab { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 11px; color: var(--text-3); background: var(--surface-2); border: 1px solid var(--border); border-bottom: none; border-radius: 8px 8px 0 0; padding: 7px 12px; margin: 26px 0 0; }
.code-tab::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--red); box-shadow: 14px 0 0 var(--amber), 28px 0 0 var(--accent); }
.c-key { color: #7db5ff; } .c-fn { color: #7fe0ad; } .c-num { color: #ffcd4d; } .c-cmt { color: #6b7280; font-style: italic; } .c-str { color: #e5a0a0; } .c-oob { color: #ff6b6b; font-weight: 700; }

.callout { border-left: 3px solid var(--accent); background: var(--accent-subtle); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 14px 18px; margin: 26px 0; font-size: 15.5px; }
.callout .k { display: block; font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent-text); margin-bottom: 6px; }
.callout.warn { border-left-color: var(--amber); background: rgba(245,158,11,0.09); } .callout.warn .k { color: var(--amber); }
.callout.danger { border-left-color: var(--red); background: rgba(239,68,68,0.09); } .callout.danger .k { color: var(--red); }

.cve-badge { font-family: var(--mono); font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 6px; background: var(--accent); color: #06130d; letter-spacing: 0.02em; }
:root[data-theme="light"] .cve-badge, :root:not([data-theme="dark"]) .cve-badge { color: #fff; }
.sev-badge { font-family: var(--mono); font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 6px; border: 1px solid; }
.sev-badge.high { color: var(--amber); border-color: rgba(245,158,11,0.4); background: rgba(245,158,11,0.08); }

.facts { width: 100%; border-collapse: collapse; margin: 26px 0; font-size: 14.5px; border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.facts td { padding: 11px 16px; border-bottom: 1px solid var(--border); vertical-align: top; }
.facts tr:last-child td { border-bottom: none; }
.facts td:first-child { color: var(--text-3); font-family: var(--mono); font-size: 12px; width: 160px; white-space: nowrap; }
.facts td:last-child { color: var(--text-2); }

figure { margin: 36px 0; }
.diagram { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
figcaption { font-size: 13px; color: var(--text-3); text-align: center; margin-top: 12px; font-style: italic; }
.svg-wrap { width: 100%; overflow-x: auto; }
svg text { font-family: var(--mono); }

.toc { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; margin: 30px 0; font-size: 14.5px; }
.toc .k { font-family: var(--mono); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-3); margin-bottom: 12px; }
.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 30px; }
.toc li { margin: 5px 0; }
.toc a { color: var(--text-2); } .toc a:hover { color: var(--accent-text); text-decoration: none; }

.refs li { margin: 11px 0; color: var(--text-2); font-size: 14.5px; }
.refs code { font-size: 0.8em; }

.site-footer { border-top: 1px solid var(--border); padding: 40px 0; color: var(--text-3); font-size: 13px; font-family: var(--mono); }
.site-footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; }

@media (max-width: 680px) {
  body { font-size: 16px; }
  .toc ol { columns: 1; }
  .nav-links { display: none; }
  .facts td:first-child { width: auto; }
}