/* Shared styles for tarekkharsa.github.io. No build step: edit and push. */
:root {
  --paper: #FBFAF7;
  --paper-2: #F3F0E9;
  --ink: #1B1F24;
  --muted: #5B6570;
  --faint: #8A929B;
  --accent: #B4540A;
  --accent-ink: #FFFFFF;
  --accent-soft: rgba(180, 84, 10, 0.09);
  --accent-line: rgba(180, 84, 10, 0.30);
  --line: #E7E2D9;
  --pill-line: #D6CFC3;
  --card: #FFFFFF;
  --term: #14181C;
  --term-ink: #D7DEE4;
  --shadow: 0 1px 2px rgba(27, 31, 36, 0.04), 0 8px 24px -12px rgba(27, 31, 36, 0.12);
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius: 12px;
  --wide: 46rem;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --paper: #14171B;
  --paper-2: #1A1E23;
  --ink: #E9E7E2;
  --muted: #9AA3AC;
  --faint: #737C85;
  --accent: #F0975A;
  --accent-ink: #14171B;
  --accent-soft: rgba(240, 151, 90, 0.11);
  --accent-line: rgba(240, 151, 90, 0.32);
  --line: #292E34;
  --pill-line: #353B42;
  --card: #181C21;
  --term: #0E1114;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 10px 28px -14px rgba(0, 0, 0, 0.55);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14171B;
    --paper-2: #1A1E23;
    --ink: #E9E7E2;
    --muted: #9AA3AC;
    --faint: #737C85;
    --accent: #F0975A;
    --accent-ink: #14171B;
    --accent-soft: rgba(240, 151, 90, 0.11);
    --accent-line: rgba(240, 151, 90, 0.32);
    --line: #292E34;
    --pill-line: #353B42;
    --card: #181C21;
    --term: #0E1114;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 10px 28px -14px rgba(0, 0, 0, 0.55);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-padding-top: 5rem; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--accent-soft); }
img { max-width: 100%; }

.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 1rem; top: 1rem; z-index: 50; background: var(--card); padding: 0.5rem 0.8rem; border-radius: 8px; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid transparent;
}
.topbar.scrolled { border-bottom-color: var(--line); }
.topbar-inner {
  max-width: var(--wide); margin: 0 auto; padding: 0.7rem 1.35rem;
  display: flex; align-items: center; gap: 1rem;
}
.brand { font-family: var(--mono); font-weight: 700; font-size: 0.92rem; color: var(--ink); letter-spacing: -0.02em; }
.brand:hover { text-decoration: none; color: var(--accent); }
.brand .accent { color: var(--accent); }
.nav { display: flex; gap: 0.25rem; margin-left: auto; align-items: center; }
.nav a {
  font-family: var(--mono); font-size: 0.8rem; color: var(--muted);
  padding: 0.3rem 0.6rem; border-radius: 8px;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); background: var(--accent-soft); text-decoration: none; }
.theme-toggle {
  border: 1px solid var(--pill-line); background: transparent; color: var(--muted);
  width: 2rem; height: 2rem; border-radius: 8px; cursor: pointer; display: grid; place-items: center;
  margin-left: 0.25rem;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--accent-line); }
.theme-toggle svg { width: 1rem; height: 1rem; }
.theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: block; }

/* reading progress: CSS scroll timeline, no JS, no repaint loop */
.progress { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 30; pointer-events: none; }
.progress span { display: block; height: 100%; background: var(--accent); transform-origin: 0 50%; transform: scaleX(0); }
@supports (animation-timeline: scroll()) {
  .progress span { animation: grow linear both; animation-timeline: scroll(root); }
  @keyframes grow { to { transform: scaleX(1); } }
}

main { max-width: var(--wide); margin: 0 auto; padding: clamp(2rem, 6vh, 4rem) 1.35rem 4.5rem; }

/* ---------- home ---------- */
.prompt { font-family: var(--mono); font-size: 0.82rem; color: var(--faint); margin: 0 0 0.9rem; }
.prompt .dollar { color: var(--accent); }
/* home hero: intro on the left, a small window-framed portrait on the right */
.hero-split {
  display: grid; grid-template-columns: minmax(0, 1fr) 13.5rem; column-gap: 2.75rem; align-items: center;
  grid-template-areas: "head photo" "body photo";
}
.hero-head { grid-area: head; min-width: 0; align-self: end; }
.hero-body { grid-area: body; min-width: 0; align-self: start; }
.portrait { grid-area: photo; }
.portrait {
  margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  overflow: hidden; box-shadow: var(--shadow); transform: rotate(1.5deg);
  transition: transform 0.25s ease;
}
.portrait:hover { transform: rotate(0deg) translateY(-2px); }
.portrait-bar {
  display: flex; align-items: center; gap: 0.6rem; padding: 0.5rem 0.7rem;
  border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 0.68rem; color: var(--faint);
}
.portrait-dots { display: flex; gap: 0.3rem; }
.portrait-dots span { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--pill-line); }
.portrait-dots span:first-child { background: var(--accent); }
.portrait img {
  display: block; width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; object-position: 38% 50%;
}
.portrait figcaption {
  padding: 0.55rem 0.75rem 0.6rem; border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: 0.66rem; line-height: 1.45; color: var(--faint);
}
.hero h1 {
  font-family: var(--mono); font-size: clamp(2rem, 7vw, 3rem); line-height: 1.1;
  letter-spacing: -0.04em; font-weight: 700; margin: 0 0 1rem;
}
.hero h1 .accent { color: var(--accent); }
.lede { font-size: 1.08rem; color: var(--muted); max-width: 38rem; margin: 0 0 1.5rem; }
.lede strong { color: var(--ink); font-weight: 600; }
.now {
  display: inline-flex; align-items: center; gap: 0.55rem; font-family: var(--mono); font-size: 0.78rem;
  color: var(--muted); border: 1px solid var(--line); background: var(--card); padding: 0.35rem 0.75rem;
  border-radius: 14px; margin: 0 0 1.6rem;
}
.now .dot { flex: none; width: 0.5rem; height: 0.5rem; border-radius: 50%; background: #3FB950; box-shadow: 0 0 0 3px rgba(63, 185, 80, 0.18); }
.links { display: flex; flex-wrap: wrap; gap: 0.55rem; margin: 0; padding: 0; list-style: none; }
.links a, .pill {
  display: inline-flex; align-items: center; gap: 0.4rem; font-family: var(--mono); font-size: 0.8rem; color: var(--ink);
  padding: 0.38rem 0.8rem; border: 1px solid var(--pill-line); border-radius: 999px;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.links a:hover, .pill:hover { text-decoration: none; border-color: var(--accent-line); background: var(--accent-soft); }

.section { margin-top: 3.25rem; }
.section-title {
  font-family: var(--mono); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 1.2rem; display: flex; align-items: center; gap: 0.55rem;
}
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.section-lede { color: var(--muted); margin: -0.3rem 0 1.4rem; max-width: 40rem; }
.section-lede a { font-family: var(--mono); font-size: 0.85rem; font-weight: 600; white-space: nowrap; }

/* codebase cards: one per studied repo, with its lessons */
.codebases { display: grid; gap: 1.1rem; }
.codebase {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 1.4rem 1.5rem 1.25rem;
  box-shadow: var(--shadow);
}
.kicker {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--faint);
  margin: 0 0 0.4rem; display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.6rem;
}
.kicker > span { white-space: nowrap; }
.kicker .live {
  display: inline-flex; align-items: center; gap: 0.4rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink);
  border: 1px solid var(--line); background: var(--paper-2); border-radius: 999px; padding: 0.05rem 0.5rem;
}
.kicker .live::before { content: ""; width: 0.42rem; height: 0.42rem; border-radius: 50%; background: #3FB950; }
.codebase h3 { font-family: var(--mono); font-size: 1.45rem; letter-spacing: -0.03em; line-height: 1.2; margin: 0 0 0.4rem; }
.codebase h3 a { color: var(--ink); }
.codebase h3 a:hover { color: var(--accent); text-decoration: none; }
.codebase > p:not(.kicker) { color: var(--muted); margin: 0 0 1rem; max-width: 38rem; }
.lesson-list {
  list-style: none; margin: 0 0 1rem; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 1.2rem; border-top: 1px solid var(--line);
}
.lesson-list li { border-bottom: 1px solid var(--line); }
.lesson-list a {
  display: flex; gap: 0.65rem; align-items: baseline; padding: 0.55rem 0.1rem; color: var(--ink); font-size: 0.93rem;
  line-height: 1.4; text-wrap: pretty;
}
.lesson-list a:hover { color: var(--accent); text-decoration: none; }
.lesson-list .n { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); flex: none; }
.lesson-list a:hover .n { color: var(--accent); }
.cta { font-family: var(--mono); font-size: 0.82rem; font-weight: 600; color: var(--accent); }

/* post list */
.posts, .prose .posts { list-style: none; margin: 0; padding: 0; }
.prose .posts li { margin: 0; }
.posts li { border-top: 1px solid var(--line); }
.posts li:first-child { border-top: none; }
.posts a.row {
  display: grid; grid-template-columns: 1fr auto; gap: 0.2rem 1rem; padding: 1rem 0.75rem; margin: 0 -0.75rem;
  border-radius: 10px; color: var(--ink);
}
.posts a.row:hover { text-decoration: none; background: var(--accent-soft); }
.posts .t { font-family: var(--mono); font-weight: 700; font-size: 0.97rem; letter-spacing: -0.01em; text-wrap: pretty; }
.posts a.row:hover .t { color: var(--accent); }
.posts .d { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); white-space: nowrap; }
.posts .s { grid-column: 1 / -1; color: var(--muted); font-size: 0.94rem; }
.tag {
  display: inline-block; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); border-radius: 5px; padding: 0.05rem 0.4rem; margin-right: 0.4rem;
  vertical-align: 0.12em;
}

.round-intro { color: var(--muted); }

/* ---------- article ---------- */
.crumbs { font-family: var(--mono); font-size: 0.78rem; color: var(--faint); margin: 0 0 1.6rem; }
.crumbs a { color: var(--faint); }
.crumbs a:hover { color: var(--accent); }
.post-header .meta {
  font-family: var(--mono); font-size: 0.76rem; color: var(--faint); margin: 0 0 0.9rem;
  display: flex; flex-wrap: wrap; gap: 0.35rem 0.9rem; align-items: center;
}
.post-header h1 {
  font-family: var(--mono); font-size: clamp(1.6rem, 5.4vw, 2.3rem); line-height: 1.18; letter-spacing: -0.035em;
  font-weight: 700; margin: 0 0 0.8rem; text-wrap: balance;
}
.byline {
  display: flex; align-items: center; gap: 0.6rem; margin: 1.1rem 0 0;
  font-family: var(--mono); font-size: 0.78rem; color: var(--faint);
}
.byline a { color: var(--muted); }
.byline a:hover { color: var(--accent); }
.subtitle { color: var(--muted); font-size: 1.1rem; margin: 0; text-wrap: pretty; }

.series-nav {
  margin: 1.8rem 0 0; padding: 0.8rem 0.9rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 0.9rem;
}
.series-nav .label:hover { color: var(--accent); text-decoration: none; }
.series-nav .label { font-family: var(--mono); font-size: 0.72rem; color: var(--faint); letter-spacing: 0.06em; text-transform: uppercase; }
.series-nav ol { display: flex; flex-wrap: wrap; gap: 0.3rem; list-style: none; margin: 0; padding: 0; }
.series-nav ol a {
  font-family: var(--mono); font-size: 0.74rem; min-width: 1.75rem; height: 1.75rem; padding: 0 0.45rem;
  display: grid; place-items: center; border-radius: 7px; border: 1px solid var(--pill-line); color: var(--muted);
}
.series-nav ol a:hover { text-decoration: none; border-color: var(--accent-line); color: var(--ink); }
.series-nav ol a.tips { border-style: dashed; }
.series-nav ol a[aria-current="page"] { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 700; }

.prose { margin-top: 2.4rem; }
.prose-body { display: contents; } /* wrapper around the post's hand-written HTML */
.prose h2 {
  font-family: var(--mono); font-size: 1.22rem; letter-spacing: -0.02em; line-height: 1.3; margin: 2.6rem 0 0.9rem;
  position: relative;
}
.prose h3 { font-family: var(--mono); font-size: 1rem; letter-spacing: -0.01em; margin: 1.9rem 0 0.7rem; position: relative; }
.prose .anchor {
  position: absolute; left: -1.2rem; color: var(--faint); opacity: 0; font-weight: 400; transition: opacity 0.15s ease;
}
.prose h2:hover .anchor, .prose h3:hover .anchor, .prose .anchor:focus { opacity: 1; text-decoration: none; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.05rem; }
.prose li { margin: 0.3rem 0; }
.prose ul, .prose ol { padding-left: 1.4rem; }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 2.6rem 0; }
.prose strong { font-weight: 650; }

code {
  font-family: var(--mono); font-size: 0.86em; background: var(--accent-soft); padding: 0.08em 0.35em; border-radius: 4px;
}
kbd {
  font-family: var(--mono); font-size: 0.78em; padding: 0.08em 0.4em; border-radius: 5px;
  border: 1px solid var(--pill-line); border-bottom-width: 2px; background: var(--card); color: var(--ink); white-space: nowrap;
}
.code { position: relative; margin: 0 0 1.25rem; }
pre {
  background: var(--term); color: var(--term-ink); border-radius: 10px; padding: 1rem 1.2rem; margin: 0 0 1.25rem;
  font-size: 0.8rem; line-height: 1.7; overflow-x: auto;
}
.code pre { margin: 0; }
pre code { background: none; padding: 0; font-size: inherit; color: inherit; border-radius: 0; }
.copy-code {
  position: absolute; top: 0.5rem; right: 0.5rem; font-family: var(--mono); font-size: 0.68rem; color: #97A1AD;
  background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.12); border-radius: 6px;
  padding: 0.2rem 0.5rem; cursor: pointer; opacity: 0; transition: opacity 0.15s ease;
}
.code:hover .copy-code, .copy-code:focus-visible { opacity: 1; }
@media (hover: none) { .copy-code { opacity: 1; } }

blockquote {
  margin: 0 0 1.25rem; padding: 0.8rem 1.1rem; border-left: 3px solid var(--accent); background: var(--accent-soft);
  border-radius: 0 10px 10px 0; font-size: 1.02rem;
}
.prose blockquote p, blockquote p { margin: 0; }

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin: 0 0 1.4rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: var(--mono); font-size: 0.74rem; color: var(--faint); font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }

/* callouts */
.callout {
  border: 1px solid var(--line); background: var(--card); border-radius: var(--radius); padding: 1.1rem 1.25rem;
  margin: 2rem 0; box-shadow: var(--shadow);
}
.callout > :last-child { margin-bottom: 0; }
.callout-kicker { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin: 0 0 0.45rem !important; }
.callout-title { font-family: var(--mono); font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; margin: 0 0 0.5rem !important; }
.callout-big .callout-title { font-size: 1.8rem; }
.steal { border-color: var(--accent-line); }

/* "Read the source" at the end of each lesson */
.source { border-style: dashed; border-color: var(--accent-line); background: var(--paper-2); box-shadow: none; }
.source ul { margin: 0.5rem 0 0 !important; }
.source li code { white-space: normal; overflow-wrap: anywhere; }
.btn {
  display: inline-flex; align-items: center; gap: 0.45rem; font: 600 0.8rem var(--mono); cursor: pointer;
  border-radius: 9px; padding: 0.5rem 0.85rem; border: 1px solid var(--pill-line); background: var(--card); color: var(--ink);
}
.btn:hover { text-decoration: none; border-color: var(--accent-line); background: var(--accent-soft); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent); filter: brightness(1.06); color: var(--accent-ink); }
.btn svg { width: 0.95rem; height: 0.95rem; }

/* ---------- lesson building blocks ---------- */
/* "In short": the problem and the idea, one sentence each, at the top of a lesson */
.tldr {
  display: grid; gap: 0; margin: 0 0 2rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); box-shadow: var(--shadow); overflow: hidden;
}
.tldr > div { display: grid; grid-template-columns: 6.5rem 1fr; gap: 0.9rem; padding: 0.85rem 1.1rem; }
.tldr > div + div { border-top: 1px solid var(--line); }
.tldr dt, .tldr .k {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint);
  padding-top: 0.2rem;
}
.tldr .idea .k { color: var(--accent); }
.tldr p { margin: 0 !important; }
.tldr dd { margin: 0; }
.tldr .idea p { font-weight: 600; color: var(--ink); }

/* numbered step cards */
.prose .flow { list-style: none; padding: 0; margin: 0 0 1.4rem; display: grid; gap: 0.6rem; counter-reset: flow; }
.flow li {
  counter-increment: flow; margin: 0; padding: 0.8rem 1rem 0.8rem 3.1rem; position: relative;
  border: 1px solid var(--line); border-radius: 12px; background: var(--card);
}
.flow li::before {
  content: counter(flow); position: absolute; left: 0.9rem; top: 0.8rem; width: 1.5rem; height: 1.5rem;
  display: grid; place-items: center; border-radius: 7px; background: var(--accent-soft); color: var(--accent);
  font: 700 0.78rem var(--mono);
}
.flow li > strong:first-child { display: block; font-family: var(--mono); font-size: 0.92rem; margin-bottom: 0.15rem; }

/* side-by-side comparison */
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; margin: 0 0 1.4rem; }
.compare-grid > div { border: 1px solid var(--line); border-radius: 12px; background: var(--card); padding: 0.85rem 1rem; }
.compare-grid .k { font: 700 0.8rem var(--mono); color: var(--accent); margin: 0 0 0.3rem !important; }
.compare-grid p { margin: 0 0 0.4rem !important; font-size: 0.95rem; }
.compare-grid p:last-child { margin-bottom: 0 !important; }

/* interactive demo card: title, a stage you can play with, controls, then the code */
.demo {
  border: 1px solid var(--line); border-radius: 16px; background: var(--card); box-shadow: var(--shadow);
  margin: 0 0 2.2rem; overflow: hidden;
}
.demo-head { display: flex; gap: 0.8rem; align-items: center; padding: 0.85rem 1rem; border-bottom: 1px solid var(--line); background: var(--paper-2); }
.demo-icon {
  flex: none; width: 2rem; height: 2rem; border-radius: 8px; display: grid; place-items: center;
  background: var(--accent); color: var(--accent-ink); font: 700 0.95rem var(--mono);
}
.demo-title { font: 700 0.95rem var(--mono); margin: 0 !important; letter-spacing: -0.01em; }
.demo-sub { font: 0.74rem var(--mono); color: var(--faint); margin: 0 !important; }
.demo-stage { padding: 1rem; display: grid; gap: 0.8rem; }
.demo-controls { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.demo-controls .btn { font-size: 0.76rem; padding: 0.45rem 0.7rem; }
.demo-status {
  font: 0.8rem/1.5 var(--mono); color: var(--muted); background: var(--paper-2); border: 1px solid var(--line);
  border-radius: 9px; padding: 0.55rem 0.75rem; margin: 0 !important; min-height: 2.6rem;
}
.demo-status strong { color: var(--ink); }
.demo > pre, .demo .code { margin: 0 !important; }
.demo pre { border-radius: 0; border-top: 1px solid var(--line); }
.demo-lanes { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.lane { border: 1px dashed var(--pill-line); border-radius: 12px; padding: 0.6rem; min-height: 7.5rem; }
.lane-title { display: flex; justify-content: space-between; font: 0.7rem var(--mono); color: var(--faint); text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 0.5rem !important; }
.lane ul { list-style: none; margin: 0 !important; padding: 0 !important; display: grid; gap: 0.35rem; }
.lane li { margin: 0 !important; }
.chip {
  display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; font: 0.76rem var(--mono);
  border: 1px solid var(--line); background: var(--paper); border-radius: 8px; padding: 0.35rem 0.55rem;
  animation: chip-in 0.25s ease;
}
.chip .m { font-size: 0.66rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--faint); }
.chip.steer .m { color: var(--accent); }
.chip.flash { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
@keyframes chip-in { from { opacity: 0; transform: translateY(-4px); } }
.agent { display: inline-flex; align-items: center; gap: 0.45rem; font: 0.76rem var(--mono); color: var(--muted); }
.agent::before { content: ""; width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--pill-line); }
.agent[data-state="working"]::before { background: #3FB950; box-shadow: 0 0 0 3px rgba(63, 185, 80, 0.18); }
.agent[data-state="crashed"]::before { background: #E5534B; }

/* policy playground */
.rules { list-style: none; margin: 0 !important; padding: 0 !important; display: grid; gap: 0.4rem; counter-reset: rule; }
.rules li {
  counter-increment: rule; margin: 0 !important; display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem;
  border: 1px solid var(--line); border-radius: 10px; padding: 0.45rem 0.55rem; background: var(--paper);
  font: 0.78rem var(--mono);
}
.rules li::before { content: counter(rule); color: var(--faint); width: 1rem; }
.rules li.match { border-color: var(--pill-line); }
.rules li.win { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.rules .verdict { margin-left: auto; font-size: 0.68rem; color: var(--faint); text-transform: uppercase; letter-spacing: 0.06em; }
.rules li.win .verdict { color: var(--accent); font-weight: 700; }
.rules select, .demo select {
  font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--pill-line); border-radius: 7px; padding: 0.25rem 0.4rem;
}
.rules button { font: inherit; background: none; border: 1px solid var(--pill-line); color: var(--muted); border-radius: 7px; padding: 0.2rem 0.45rem; cursor: pointer; }
.rules button:hover { color: var(--ink); border-color: var(--accent-line); }
.effect-allow { color: #3FB950 !important; } .effect-deny { color: #E5534B !important; }
.result { font: 700 1rem var(--mono); }
.result.allow { color: #3FB950; } .result.deny { color: #E5534B; }
.demo-row { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; font: 0.8rem var(--mono); color: var(--muted); }

/* demo controls and visuals */
.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--pill-line); border-radius: 9px; overflow: hidden; }
.seg button { font: 0.74rem var(--mono); background: var(--card); color: var(--muted); border: 0; padding: 0.4rem 0.65rem; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--pill-line); }
.seg button.on { background: var(--accent); color: var(--accent-ink); font-weight: 700; }
.slider { display: flex; align-items: center; gap: 0.7rem; font: 0.78rem var(--mono); color: var(--muted); }
.slider input { flex: 1; accent-color: var(--accent); }
.slider output { min-width: 6.5rem; text-align: right; color: var(--ink); }
.check { display: inline-flex; align-items: center; gap: 0.4rem; font: 0.78rem var(--mono); color: var(--muted); cursor: pointer; }
.check input { accent-color: var(--accent); }
.lane-note { font: 0.74rem/1.5 var(--mono); color: var(--faint); margin: 0.5rem 0 0 !important; }
.chip.bad { border-color: #E5534B; } .chip.bad .m { color: #E5534B; }
.dots { display: flex; flex-wrap: wrap; gap: 0.3rem; }
.dots span { width: 0.85rem; height: 0.85rem; border-radius: 4px; }
.dots .ok { background: #3FB950; } .dots .fail { background: #E5534B; }
.demo-table { width: 100%; border-collapse: collapse; font: 0.76rem var(--mono); display: table; margin: 0 !important; }
.demo-table th, .demo-table td { padding: 0.4rem 0.5rem; border-bottom: 1px solid var(--line); text-align: left; }
.demo-table td.good { color: #3FB950; } .demo-table td.bad { color: #E5534B; }
.demo-table tr.dead td { color: var(--faint); text-decoration: line-through; }
.demo-table tr.dead td:last-child { text-decoration: none; color: #E5534B; }
.badge { display: inline-block; font: 700 0.8rem var(--mono); border-radius: 999px; padding: 0.3rem 0.75rem; margin: 0 !important; border: 1px solid var(--line); }
.badge.good { color: #3FB950; border-color: rgba(63, 185, 80, 0.4); }
.badge.bad { color: #E5534B; border-color: rgba(229, 83, 75, 0.4); }
.badge.warn { color: #D29922; border-color: rgba(210, 153, 34, 0.45); }
.lie { color: #E5534B; font-weight: 700; }
.result.warn { color: #D29922; }
.meter { position: relative; height: 0.7rem; border-radius: 99px; background: var(--paper-2); border: 1px solid var(--line); overflow: hidden; }
.meter .fill { position: absolute; inset: 0 auto 0 0; display: block; }
.meter .fill.ok { background: #3FB950; } .meter .fill.over { background: #E5534B; }
.meter .mark { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--ink); }
.meter.split { display: flex; gap: 0; }
.meter.split .fill { position: static; height: 100%; }
.meter.split .gap { flex: 1; display: grid; place-items: center; font: 0.6rem var(--mono); color: var(--faint); }
.tree { display: grid; gap: 0.25rem; }
.node {
  display: flex; gap: 0.45rem; align-items: center; text-align: left; font: 0.74rem var(--mono); color: var(--muted);
  background: var(--paper); border: 1px solid var(--line); border-radius: 7px; padding: 0.3rem 0.5rem; cursor: pointer;
}
.node .m { font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--faint); min-width: 4.6rem; }
.node.active { color: var(--ink); border-color: var(--pill-line); }
.node.leaf::after { content: "●"; color: var(--accent); margin-left: auto; }
.node.sel { box-shadow: 0 0 0 2px var(--accent-line); }
.node.compaction .m, .node.context_edit .m { color: var(--accent); }
.prose .ctx { margin: 0 !important; padding-left: 1.2rem !important; font: 0.74rem/1.6 var(--mono); color: var(--ink); }
.ctx li { margin: 0.15rem 0 !important; }
.ctx li.compaction { color: var(--accent); }
pre.file .ln.changed, pre.term .tl.painted { background: rgba(63, 185, 80, 0.16); }
pre.term .tl.painted { animation: paint 0.6s ease; }
@keyframes paint { from { background: rgba(240, 151, 90, 0.35); } }
.demo-stage pre { margin: 0 !important; border-radius: 9px; }
.cache-row { display: grid; grid-template-columns: 9.5rem 1fr 4.5rem; gap: 0.5rem; align-items: center; font: 0.72rem var(--mono); color: var(--muted); margin: 0 0 0.3rem; }
.cache-row .num { text-align: right; }
.cbar { display: flex; height: 0.7rem; border-radius: 4px; overflow: hidden; background: var(--paper-2); }
.cbar .hit, .legend .hit { background: #3FB950; } .cbar .miss, .legend .miss { background: #E5534B; }
.legend { display: inline-flex; gap: 0.35rem; align-items: center; margin-left: 0.4rem; color: var(--faint); }
.legend span:not([class=""]) { display: inline-block; width: 0.65rem; height: 0.65rem; border-radius: 2px; }
.ctxbar { position: relative; display: flex; height: 1.4rem; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; background: var(--paper-2); }
.ctxbar .cseg { display: block; height: 100%; border: 0; border-right: 1px solid var(--paper); border-radius: 0; }
.ctxbar .sys, .legend .sys { background: #6E7681; } .ctxbar .sum, .legend .sum { background: var(--accent); } .ctxbar .turn, .legend .turn { background: #3FB950; }
.ctxbar .limit { position: absolute; top: 0; bottom: 0; width: 2px; background: #E5534B; }

/* "Use it in your code" prompt */
.apply { border-color: var(--accent-line); }
.apply pre.prompt-text { white-space: pre-wrap; font-size: 0.8rem; line-height: 1.6; margin: 0.8rem 0 0; max-height: 19rem; overflow-y: auto; }
.apply .code { margin: 0.8rem 0 0; }
.apply .code pre.prompt-text { margin: 0; padding-top: 2.2rem; }
.apply .copy-code { opacity: 1; }

/* recap + tips */
.recap li { margin: 0.45rem 0; }
.tips { padding-left: 1.7rem !important; }
.tips li { margin: 0 0 0.85rem; padding-left: 0.2rem; }
.tips li::marker { font-family: var(--mono); color: var(--accent); font-weight: 700; font-size: 0.9em; }
.tips pre { margin-top: 0.6rem; }

/* prev / next */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; margin: 3rem 0 0; }
.pager a {
  display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 0.9rem 1rem; color: var(--ink); background: var(--card);
}
.pager a:hover { text-decoration: none; border-color: var(--accent-line); }
.pager .dir { display: block; font-family: var(--mono); font-size: 0.72rem; color: var(--faint); margin-bottom: 0.25rem; }
.pager .tt { font-family: var(--mono); font-size: 0.88rem; font-weight: 700; letter-spacing: -0.01em; }
.pager .next { text-align: right; grid-column: 2; }

.share { display: flex; flex-wrap: wrap; gap: 0.55rem; align-items: center; margin: 2.4rem 0 0; }
.share .label { font-family: var(--mono); font-size: 0.76rem; color: var(--faint); margin-right: 0.2rem; }

/* ---------- footer ---------- */
.site-footer {
  max-width: var(--wide); margin: 0 auto; padding: 1.4rem 1.35rem 2.5rem; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; justify-content: space-between;
  font-family: var(--mono); font-size: 0.76rem; color: var(--faint);
}
.site-footer a { color: var(--faint); }
.site-footer a:hover { color: var(--accent); }
.site-footer nav { display: flex; gap: 1.1rem; }

@media (max-width: 720px) {
  /* photo beside the name, intro full width below, so the hero fits the first screen */
  .hero-split {
    grid-template-columns: minmax(0, 1fr) 6.5rem; column-gap: 1.1rem; row-gap: 1.3rem;
    grid-template-areas: "head photo" "body body";
  }
  .hero-head { align-self: center; }
  .hero-head h1 { margin: 0; }
  .portrait { border-radius: 11px; transform: rotate(2deg); }
  .portrait-bar { padding: 0.35rem 0.5rem; }
  .portrait-dots span { width: 0.45rem; height: 0.45rem; }
  .portrait-name, .portrait figcaption { display: none; }
}
@media (max-width: 560px) {
  body { font-size: 16.5px; }
  main { padding: 1.4rem 1.15rem 3.5rem; }
  .topbar-inner { padding: 0.55rem 1.15rem; }
  .site-footer { padding: 1.3rem 1.15rem 2.2rem; }

  /* bigger tap targets */
  .nav a { padding: 0.5rem 0.65rem; }
  .theme-toggle { width: 2.35rem; height: 2.35rem; }
  .btn { padding: 0.62rem 0.95rem; }
  .links a { padding: 0.5rem 0.95rem; }

  /* codebase cards */
  .codebase { padding: 1.15rem 1.1rem 1.05rem; }
  .codebase h3 { font-size: 1.25rem; }
  .lesson-list { grid-template-columns: 1fr; }
  .lesson-list a { padding: 0.65rem 0.1rem; }

  /* post lists: tag on its own line, title below it */
  .posts a.row { padding: 0.95rem 0.6rem; margin: 0 -0.6rem; }
  .posts .t .tag { display: table; margin: 0 0 0.4rem; }

  /* article header */
  .crumbs { margin-bottom: 1.2rem; }
  .post-header .meta { gap: 0.25rem 0.75rem; }

  /* series nav: label above, every page in one even row */
  .series-nav { display: block; padding: 0.75rem; margin-top: 1.5rem; }
  .series-nav .label { display: block; margin-bottom: 0.55rem; }
  .series-nav ol { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)) auto; gap: 0.25rem; }
  .series-nav ol a { min-width: 0; height: 2.1rem; padding: 0; }
  .series-nav ol a.tips { padding: 0 0.5rem; }

  /* prose */
  .prose { margin-top: 2rem; }
  .prose h2 { font-size: 1.12rem; margin-top: 2.2rem; }
  .prose .anchor { display: none; }
  /* top-level code blocks run edge to edge to give long lines room */
  .prose-body > .code, .prose-body > pre { margin-left: -1.15rem; margin-right: -1.15rem; }
  .prose-body > .code pre, .prose-body > pre { border-radius: 0; padding: 0.9rem 1.15rem; }
  pre { font-size: 0.76rem; }
  blockquote { padding: 0.75rem 0.95rem; }
  .callout { padding: 1rem 1.05rem; margin: 1.6rem 0; }
  .callout-big .callout-title { font-size: 1.5rem; }

  .tldr > div { grid-template-columns: 1fr; gap: 0.2rem; padding: 0.8rem 0.95rem; }
  .compare-grid, .demo-lanes { grid-template-columns: 1fr; }
  .cache-row { grid-template-columns: 6.5rem 1fr 3.8rem; }
  .slider output { min-width: 5rem; }
  .demo-stage { padding: 0.85rem; }
  .lane { min-height: 0; }
  .pager { grid-template-columns: 1fr; margin-top: 2.4rem; }
  .pager .next { grid-column: 1; }
  .share { margin-top: 2rem; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .progress { display: none; }
}
@media print {
  .topbar, .progress, .share, .pager, .series-nav, .site-footer, .copy-code { display: none !important; }
}