/* firnware.com — glacial design system, v2.
   The theme IS the material: compacted snow and glacier ice. Frosted-glass
   surfaces, cold atmospheric light, film grain like snowpack, strata motif.
   Monospace first-class; amber reserved for compiler diagnostics.
   Dark default; light via [data-theme="light"]. */

/* ---------- fonts (self-hosted, no third-party requests) ---------- */

@font-face {
  font-family: "Inter";
  src: url("/assets/fonts/inter-var.woff2") format("woff2-variations");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jetbrains-mono-400.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jetbrains-mono-600.woff2") format("woff2");
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jetbrains-mono-italic.woff2") format("woff2");
  font-weight: 400; font-style: italic; font-display: swap;
}

/* ---------- palette ---------- */

:root,
:root[data-theme="dark"] {
  --bg: #070b12;
  --bg-2: #0a1019;              /* atmosphere floor */
  --bg-raise: #0f1723;
  --bg-code: #0b121c;
  --text: #d9e4ef;
  --text-strong: #f4f9fd;
  --muted: #8ca1b8;
  --line: #1d2938;
  --line-soft: #16202d;
  --border: rgba(151, 197, 235, 0.14);
  --border-strong: rgba(151, 197, 235, 0.26);
  --accent: #6db6ec;
  --accent2: #8fe0f6;           /* ice cyan, gradients only */
  --accent-strong: #a4d4f4;
  --amber: #e8b45a;
  --amber-dim: rgba(232, 180, 90, 0.09);
  --ok: #7fc98f;
  --glass: rgba(15, 24, 37, 0.58);
  --glass-heavy: rgba(13, 20, 32, 0.78);
  --edge: rgba(255, 255, 255, 0.07);       /* inset ice-edge highlight */
  --glow: rgba(109, 182, 236, 0.16);
  --tok-kw: #8ec6f2;
  --tok-type: #a7d7c5;
  --tok-str: #d3b98a;
  --tok-num: #c8a8e8;
  --tok-com: #64788e;
  --tok-fn: #cfe3f5;
  --shadow: 0 1px 2px rgba(2, 6, 12, .5), 0 10px 32px rgba(2, 6, 12, .35);
  --shadow-lg: 0 2px 4px rgba(2, 6, 12, .5), 0 24px 64px rgba(2, 6, 12, .5);
  --grain-opacity: .05;
  /* mermaid node roles (consumed by mermaid-init's var() substitution) */
  --mmd-data-fill: rgba(109, 182, 236, 0.13);
  --mmd-data-stroke: rgba(143, 224, 246, 0.6);
  --mmd-gen-fill: rgba(143, 224, 246, 0.06);
  --mmd-gen-stroke: rgba(143, 224, 246, 0.42);
  --mmd-seam-stroke: rgba(143, 224, 246, 0.55);
}

:root[data-theme="light"] {
  --bg: #f5f8fb;
  --bg-2: #eef4f9;
  --bg-raise: #ffffff;
  --bg-code: #ecf2f8;
  --text: #1a2836;
  --text-strong: #0b141d;
  --muted: #51687e;
  --line: #d7e2ec;
  --line-soft: #e2eaf1;
  --border: rgba(30, 90, 140, 0.14);
  --border-strong: rgba(30, 90, 140, 0.28);
  --accent: #176aad;
  --accent2: #2f9fc4;
  --accent-strong: #114f83;
  --amber: #8f5e0c;
  --amber-dim: rgba(143, 94, 12, 0.07);
  --ok: #256e3a;
  --glass: rgba(255, 255, 255, 0.62);
  --glass-heavy: rgba(255, 255, 255, 0.82);
  --edge: rgba(255, 255, 255, 0.85);
  --glow: rgba(23, 106, 173, 0.10);
  --tok-kw: #135589;
  --tok-type: #1c6b52;
  --tok-str: #7a5416;
  --tok-num: #6a3fa0;
  --tok-com: #6b7f92;
  --tok-fn: #253a4e;
  --shadow: 0 1px 2px rgba(30, 60, 90, .07), 0 10px 32px rgba(30, 60, 90, .08);
  --shadow-lg: 0 2px 4px rgba(30, 60, 90, .07), 0 24px 64px rgba(30, 60, 90, .12);
  --grain-opacity: .035;
  --mmd-data-fill: rgba(23, 106, 173, 0.09);
  --mmd-data-stroke: rgba(23, 106, 173, 0.65);
  --mmd-gen-fill: rgba(47, 159, 196, 0.06);
  --mmd-gen-stroke: rgba(47, 159, 196, 0.55);
  --mmd-seam-stroke: rgba(23, 106, 173, 0.6);
}

/* ---------- base + atmosphere ---------- */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }

body {
  margin: 0;
  color: var(--text);
  font: 400 16px/1.65 "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-feature-settings: "cv11" 1, "ss01" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background-color: var(--bg);
  /* cold light falling into deep ice */
  background-image:
    radial-gradient(1100px 640px at 82% -160px,
      color-mix(in srgb, var(--accent2) 9%, transparent), transparent 70%),
    radial-gradient(900px 600px at -6% 4%,
      color-mix(in srgb, var(--accent) 6%, transparent), transparent 70%),
    linear-gradient(var(--bg-2), var(--bg) 46%);
  background-attachment: fixed;
}

/* snowpack grain over everything, imperceptibly */
body::after {
  content: "";
  position: fixed; inset: 0;
  z-index: 2000;
  pointer-events: none;
  opacity: var(--grain-opacity);
  mix-blend-mode: soft-light;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
}

code, pre, kbd, .mono {
  font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}

h1, h2, h3, h4 { text-wrap: balance; }

::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); text-decoration: underline; text-underline-offset: 3px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.wrap { max-width: 1140px; margin: 0 auto; padding: 0 1.5rem; }

/* ---------- header ---------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 68%, transparent);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  box-shadow: inset 0 1px 0 var(--edge);
}
.site-header .wrap {
  display: flex; align-items: center; gap: 1.25rem;
  min-height: 3.7rem;
}
.brand {
  display: flex; align-items: center; gap: .6rem;
  color: var(--text-strong); font-weight: 650; font-size: 1.06rem;
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; color: var(--text-strong); }
.brand .mark {
  display: block; color: var(--accent); flex: none;
  filter: drop-shadow(0 0 8px var(--glow));
}
.brand .tld {
  color: var(--muted); font-weight: 400; font-size: .82rem;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  margin-top: .15rem;
}

.site-nav { display: flex; gap: .2rem; margin-left: auto; }
.site-nav a {
  color: var(--muted); padding: .4rem .7rem; border-radius: 8px;
  font-size: .92rem; font-weight: 480;
  border: 1px solid transparent;
}
.site-nav a:hover {
  color: var(--text-strong); text-decoration: none;
  background: var(--glass); border-color: var(--border);
}
.site-nav a[aria-current="page"] {
  color: var(--text-strong);
  background: var(--glass);
  border-color: var(--border);
  box-shadow: inset 0 1px 0 var(--edge);
}

.theme-toggle, .nav-toggle {
  border: 1px solid var(--border); background: var(--glass); color: var(--muted);
  border-radius: 8px; width: 2.1rem; height: 2.1rem; cursor: pointer;
  display: grid; place-items: center; flex: none;
  box-shadow: inset 0 1px 0 var(--edge);
}
.theme-toggle:hover, .nav-toggle:hover { color: var(--text-strong); border-color: var(--border-strong); }
.theme-toggle .moon { display: none; }
:root[data-theme="light"] .theme-toggle .moon { display: block; }
:root[data-theme="light"] .theme-toggle .sun { display: none; }

.nav-toggle { display: none; }
.nav-toggle .close { display: none; }

@media (max-width: 860px) {
  .nav-toggle { display: grid; order: 3; }
  .theme-toggle { order: 4; margin-left: auto; }
  .brand { order: 1; }
  .site-nav {
    display: none;
    position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; gap: .2rem;
    background: color-mix(in srgb, var(--bg) 92%, transparent);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: .6rem 1.5rem 1rem;
    box-shadow: var(--shadow-lg);
  }
  .site-nav a { padding: .65rem .7rem; font-size: 1rem; }
  .site-header.nav-open .site-nav { display: flex; }
  .site-header.nav-open .nav-toggle .burger { display: none; }
  .site-header.nav-open .nav-toggle .close { display: block; }
}

/* ---------- hero (landing) ---------- */

.hero-bleed {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
/* full-width strata rising under the panels */
.hero-strata {
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 46%;
  z-index: 0;
  pointer-events: none;
}
.hero-strata svg { display: block; width: 100%; height: 100%; }
:root[data-theme="light"] .hero-strata { opacity: .55; }

/* sparse, slow snowfall — hero only, honors reduced motion */
.snowfield {
  position: absolute; inset: 0; z-index: 0;
  pointer-events: none; overflow: hidden;
}
.snowfield .flake {
  position: absolute; top: -6px;
  border-radius: 50%;
  background: var(--accent2);
  animation: snowfall linear infinite;
}
@keyframes snowfall {
  0%   { transform: translate3d(0, -2vh, 0); opacity: 0; }
  8%   { opacity: var(--o, .3); }
  85%  { opacity: var(--o, .3); }
  100% { transform: translate3d(var(--sway, 30px), 105vh, 0); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .snowfield { display: none; }
  html { scroll-behavior: auto; }
}

.hero-bleed > .wrap { position: relative; z-index: 1; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 2.5rem;
  align-items: center;
  padding: 4.6rem 0 2.6rem;
}
@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; padding-top: 3.2rem; }
  .hero-crystal { display: none; }
}

.hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.05; letter-spacing: -0.03em; font-weight: 700;
  color: var(--text-strong); margin: 0 0 1.15rem;
}
.hero h1 .grad {
  background: linear-gradient(92deg, var(--accent-strong), var(--accent2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.hero .lede {
  max-width: 58ch; font-size: 1.09rem; line-height: 1.7;
  color: var(--muted); margin: 0 0 1.25rem;
}
.hero .lede strong { color: var(--text); font-weight: 560; }

.hero-crystal { position: relative; display: grid; place-items: center; }
.hero-crystal svg {
  display: block; width: min(100%, 420px); height: auto;
  filter: drop-shadow(0 0 34px var(--glow));
}

.status-line {
  display: inline-flex; align-items: center; gap: .55rem;
  font-size: .82rem; color: var(--muted);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  border: 1px solid var(--border); border-radius: 999px;
  padding: .38rem .95rem; margin-top: .2rem;
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 var(--edge);
}
.status-line .dot {
  width: .45rem; height: .45rem; border-radius: 50%;
  background: var(--amber); flex: none;
  box-shadow: 0 0 8px color-mix(in srgb, var(--amber) 60%, transparent);
}

.cta-row { display: flex; gap: .8rem; margin-top: 1.7rem; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .62rem 1.3rem; border-radius: 10px;
  font-size: .95rem; font-weight: 570; border: 1px solid var(--border);
  transition: transform .12s ease, box-shadow .15s ease, border-color .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(180deg, var(--accent2), var(--accent));
  color: #07131e; border-color: transparent;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .35),
    0 2px 18px color-mix(in srgb, var(--accent) 40%, transparent);
}
.btn-primary:hover {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, .4),
    0 4px 26px color-mix(in srgb, var(--accent) 55%, transparent);
}
:root[data-theme="light"] .btn-primary {
  color: #fff;
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 86%, #fff), var(--accent-strong));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.25),
              0 2px 18px color-mix(in srgb, var(--accent) 30%, transparent);
}
.btn-ghost {
  color: var(--text); background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 var(--edge);
}
.btn-ghost:hover { border-color: var(--border-strong); color: var(--text-strong); }

/* ---------- code blocks ---------- */

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: .84rem; line-height: 1.6;
  tab-size: 4;
  box-shadow: inset 0 1px 0 var(--edge);
}
code { font-size: .92em; }
:not(pre) > code {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: .08em .38em;
  font-size: .85em;
}
pre code { background: none; border: none; padding: 0; font-size: 1em; }

/* no horizontal scrollbars on narrow screens: wrap instead */
@media (max-width: 640px) {
  pre { white-space: pre-wrap; word-break: break-word; }
}

/* compiler-diagnostic styling — the ONLY place amber is used */
pre.diag {
  border-left: 3px solid var(--amber);
  background:
    linear-gradient(to right, var(--amber-dim), transparent 45%),
    var(--bg-code);
}
pre.diag code { color: var(--text); white-space: pre-wrap; word-break: break-word; }
pre.diag .err { color: var(--amber); font-weight: 600; }
pre.diag .loc { color: var(--muted); }

/* highlight.js token mapping (no external theme css) */
.hljs-keyword, .hljs-literal, .hljs-built_in { color: var(--tok-kw); }
.hljs-type, .hljs-title.class_ { color: var(--tok-type); }
.hljs-string, .hljs-meta-string { color: var(--tok-str); }
.hljs-number { color: var(--tok-num); }
.hljs-comment { color: var(--tok-com); font-style: italic; }
.hljs-title, .hljs-title.function_ { color: var(--tok-fn); }
.hljs-meta, .hljs-preprocessor { color: var(--tok-num); }
.hljs-attr, .hljs-property { color: var(--tok-type); }

/* ---------- hero three-panel sequence (frosted, floating on the strata) ---------- */

.panels-section { padding: 1rem 0 3.6rem; }

.panels {
  display: grid; gap: 0;
  grid-template-columns: 1fr 2rem 1fr 2rem 1fr;
  align-items: stretch;
}
@media (max-width: 980px) {
  .panels { grid-template-columns: 1fr; }
}

.panel {
  background: var(--glass);
  backdrop-filter: blur(18px) saturate(1.35);
  -webkit-backdrop-filter: blur(18px) saturate(1.35);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow);
  display: flex; flex-direction: column;
  min-width: 0;
  overflow: hidden;
}
.panel-label {
  display: flex; align-items: center; gap: .65rem;
  padding: .78rem 1.05rem .68rem;
  border-bottom: 1px solid var(--border);
  font-size: .8rem;
}
.panel-label .step {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  color: var(--accent); font-weight: 600; font-size: .74rem;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  border-radius: 6px; padding: .05rem .45rem;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.panel-label .what { color: var(--text-strong); font-weight: 590; letter-spacing: -0.005em; }
.panel pre {
  border: none; border-radius: 0; margin: 0; flex: 1;
  font-size: .76rem; line-height: 1.62;
  padding: 1rem;
  background: color-mix(in srgb, var(--bg-code) 55%, transparent);
  box-shadow: none;
}
.panel.diag-panel .panel-label .step {
  color: var(--amber);
  border-color: color-mix(in srgb, var(--amber) 45%, transparent);
  background: var(--amber-dim);
}

.panel-connector {
  display: grid; place-items: center;
  color: color-mix(in srgb, var(--accent) 65%, var(--muted));
}
.panel-connector svg { display: block; }
@media (max-width: 980px) {
  .panel-connector { padding: .35rem 0; }
  .panel-connector svg { transform: rotate(90deg); }
}

.panel-kicker {
  margin-top: 1.5rem; font-size: 1rem; color: var(--text);
  max-width: 72ch;
}
.panel-kicker strong { color: var(--text-strong); }

/* rotating extra diagnostics — a quiet frosted terminal line */
.diag-rotate {
  margin-top: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--glass-heavy);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: inset 0 1px 0 var(--edge);
  padding: .72rem 1rem;
  font-size: .8rem;
  color: var(--muted);
  display: flex; gap: .35rem; align-items: baseline;
  overflow: hidden; white-space: nowrap;
}
.diag-rotate .prompt {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  color: var(--muted); flex: none;
}
.diag-rotate output {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  color: var(--amber);
  transition: opacity .45s ease;
  text-overflow: ellipsis; overflow: hidden;
}
.diag-rotate output.ok { color: var(--ok); }
.diag-rotate .prompt { transition: opacity .45s ease; }
.diag-rotate .fade, .diag-rotate output.fade { opacity: 0; }

/* ---------- sections / cards ---------- */

section { padding: 3.8rem 0; position: relative; }
section + section { border-top: 1px solid var(--line-soft); }
section.tinted {
  background:
    radial-gradient(900px 420px at 12% 0%,
      color-mix(in srgb, var(--accent) 4%, transparent), transparent 70%),
    color-mix(in srgb, var(--bg-raise) 38%, transparent);
}

.eyebrow {
  display: flex; align-items: center; gap: .8rem;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: .74rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 .7rem; font-weight: 600;
}
.eyebrow::after {
  content: ""; height: 1px; width: 3.5rem;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--accent) 55%, transparent), transparent);
}
h2 {
  font-size: clamp(1.45rem, 2.7vw, 2rem); line-height: 1.18;
  color: var(--text-strong); letter-spacing: -0.022em; margin: 0 0 1rem;
  font-weight: 680;
}
h3 { color: var(--text-strong); font-size: 1.12rem; margin: 2rem 0 .6rem; letter-spacing: -0.012em; }

.cards {
  display: grid; gap: 1.1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.8rem;
}
@media (max-width: 900px) { .cards { grid-template-columns: 1fr; } }

.card {
  background: var(--glass);
  backdrop-filter: blur(16px) saturate(1.3);
  -webkit-backdrop-filter: blur(16px) saturate(1.3);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.4rem 1.4rem 1.25rem;
  box-shadow: inset 0 1px 0 var(--edge);
  transition: transform .15s ease, border-color .15s ease, box-shadow .2s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: inset 0 1px 0 var(--edge), 0 14px 44px var(--glow), var(--shadow);
}
.card .icon {
  width: 2.5rem; height: 2.5rem; border-radius: 11px;
  display: grid; place-items: center;
  color: var(--accent2);
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--accent) 16%, transparent),
    color-mix(in srgb, var(--accent) 7%, transparent));
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  box-shadow: inset 0 1px 0 var(--edge);
  margin-bottom: .95rem;
}
:root[data-theme="light"] .card .icon { color: var(--accent); }
.card h3 { margin: 0 0 .5rem; font-size: 1.03rem; }
.card p { margin: 0; color: var(--muted); font-size: .93rem; line-height: 1.62; }
.card p code { font-size: .84em; }
.card .card-proof {
  margin-top: .95rem; padding-top: .8rem;
  border-top: 1px dashed var(--border);
  font-size: .78rem; line-height: 1.5;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  color: var(--accent);
}
.card .card-proof::before { content: "✓ "; color: var(--ok); }

/* stat tiles (case study) */
.stats {
  display: grid; gap: 1.1rem;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  margin: 1.8rem 0;
}
.stat {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 16px; padding: 1.1rem 1.2rem;
  box-shadow: inset 0 1px 0 var(--edge);
  position: relative; overflow: hidden;
}
.stat::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2), transparent);
  opacity: .8;
}
.stat .n {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 1.3rem; color: var(--text-strong); font-weight: 600;
  display: block; letter-spacing: -0.01em; margin-bottom: .2rem;
}
.stat .d { font-size: .82rem; color: var(--muted); line-height: 1.5; }

/* ---------- prose pages ---------- */

.page-head { padding: 3.6rem 0 1.2rem; position: relative; }
.page-head h1 {
  font-size: clamp(1.8rem, 3.8vw, 2.7rem); line-height: 1.1;
  letter-spacing: -0.028em; color: var(--text-strong); margin: 0 0 .9rem;
  font-weight: 700; max-width: 28ch;
}
.page-head .lede { max-width: 64ch; color: var(--muted); font-size: 1.07rem; line-height: 1.7; margin: 0; }

.prose { max-width: 76ch; padding-bottom: 3rem; }
.prose > p, .prose li { color: var(--text); }
.prose li { margin-bottom: .35rem; }
.prose h2 { margin-top: 3rem; scroll-margin-top: 5rem; }
.prose h2 .sec-no {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  color: var(--accent); font-size: .72em; margin-right: .6em;
  font-weight: 600;
}
.prose hr { border: none; border-top: 1px solid var(--line-soft); margin: 2.6rem 0; }
.prose blockquote {
  margin: 1.6rem 0; padding: 1rem 1.4rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--text); font-style: italic;
  box-shadow: inset 0 1px 0 var(--edge);
}
.prose blockquote p { margin: 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: .92rem; }
.prose th, .prose td {
  text-align: left; padding: .5rem .8rem; border-bottom: 1px solid var(--line-soft);
}
.prose th { color: var(--text-strong); font-weight: 600; }
.prose .wide { max-width: none; }

.note {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 14px; padding: 1rem 1.25rem; font-size: .93rem;
  line-height: 1.65;
  color: var(--muted); margin: 1.6rem 0;
  box-shadow: inset 0 1px 0 var(--edge);
}
.note strong { color: var(--text); }

/* ---------- architecture page: content + sticky TOC ---------- */

.with-toc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3.5rem;
  align-items: start;
}
@media (min-width: 1150px) {
  .with-toc { grid-template-columns: minmax(0, 1fr) 230px; }
}
.toc {
  position: sticky; top: 5rem;
  font-size: .84rem;
  border-left: 1px solid var(--border);
  padding-left: 1.1rem;
  display: none;
}
@media (min-width: 1150px) { .toc { display: block; } }
.toc .toc-title {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: .7rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 .7rem; font-weight: 600;
}
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 0; }
.toc a {
  display: block; color: var(--muted); padding: .28rem 0;
  line-height: 1.4;
}
.toc a:hover { color: var(--text-strong); text-decoration: none; }
.toc a.active { color: var(--accent-strong); font-weight: 560; }

/* mobile contents note stays for small screens */
@media (min-width: 1150px) { .contents-note { display: none; } }

/* then/now comparison (story page) */
.then-now {
  display: grid; gap: 1rem; grid-template-columns: 1fr 1fr;
  margin: 1.6rem 0;
}
@media (max-width: 800px) { .then-now { grid-template-columns: 1fr; } }
.then-now .panel pre { font-size: .78rem; }
.then-now-caption {
  font-size: .84rem; color: var(--muted); margin: -0.4rem 0 0; line-height: 1.6;
}

/* custom lineage timeline */
.timeline {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;
  margin: 2.2rem 0;
  position: relative;
  padding-top: 1.4rem;
}
.timeline::before {
  content: "";
  position: absolute; top: 0; left: 4%; right: 4%;
  height: 2px;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--accent) 25%, transparent),
    var(--accent), var(--accent2));
  border-radius: 2px;
}
.tl-item { position: relative; }
.tl-item::before {
  content: "";
  position: absolute; top: -1.75rem; left: 0;
  width: .7rem; height: .7rem; border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.tl-item:last-child::before {
  background: var(--accent2); border-color: var(--accent2);
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent2) 70%, transparent);
}
.tl-year {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  color: var(--accent); font-size: .78rem; letter-spacing: .08em; font-weight: 600;
}
.tl-item h4 { margin: .3rem 0 .35rem; color: var(--text-strong); font-size: 1.02rem; }
.tl-item p { margin: 0; font-size: .86rem; color: var(--muted); line-height: 1.6; }
@media (max-width: 800px) {
  .timeline { grid-template-columns: 1fr; padding-top: 0; padding-left: 1.6rem; }
  .timeline::before { left: .3rem; right: auto; top: .3rem; bottom: .3rem; width: 2px; height: auto;
    background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 25%, transparent), var(--accent2)); }
  .tl-item::before { top: .15rem; left: -1.6rem; }
}

/* acts (story page) */
.acts { display: grid; gap: 1rem; grid-template-columns: repeat(3, minmax(0,1fr)); margin: 1.8rem 0; }
@media (max-width: 900px) { .acts { grid-template-columns: 1fr; } }
.act {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 16px; padding: 1.25rem 1.3rem;
  box-shadow: inset 0 1px 0 var(--edge);
  position: relative; overflow: hidden;
}
.act::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2), transparent);
  opacity: .8;
}
.act .year {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  color: var(--accent); font-size: .76rem; letter-spacing: .08em; font-weight: 600;
}
.act h3 { margin: .3rem 0 .5rem; font-size: 1.05rem; }
.act p { margin: 0; font-size: .9rem; color: var(--muted); line-height: 1.62; }

/* ---------- mermaid diagrams ---------- */

.diagram {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  margin: 1.8rem 0;
  overflow-x: auto;
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow);
}
.diagram .mermaid {
  display: flex; justify-content: center;
  /* pre-render: show the diagram source readably until mermaid replaces it */
  white-space: pre;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: .78rem; color: var(--muted);
}
.diagram .mermaid svg { max-width: 100%; height: auto; }
.diagram figcaption {
  margin-top: 1rem; font-size: .82rem; color: var(--muted); text-align: center;
}

/* case-study schematic */
.schematic {
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.6rem 1.6rem 1.1rem;
  margin: 1.8rem 0;
  box-shadow: inset 0 1px 0 var(--edge), var(--shadow);
}
.schematic svg { display: block; width: 100%; height: auto; }
.schematic figcaption {
  margin-top: .9rem; font-size: .82rem; color: var(--muted); text-align: center;
}

/* ---------- interactive board breaker ---------- */

.section-lede { max-width: 66ch; color: var(--muted); margin: 0 0 .5rem; }

.breaker {
  display: grid; gap: 1.2rem;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  margin-top: 1.8rem;
  align-items: stretch;
}
@media (max-width: 900px) { .breaker { grid-template-columns: 1fr; } }
.breaker .panel pre { font-size: .8rem; flex: 1; }
.breaker .term { min-height: 14.5rem; }

.tok {
  appearance: none; border: none; cursor: pointer;
  font: inherit; padding: 0 .18em; border-radius: 5px;
  color: var(--tok-str);
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  outline: 1px dashed color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 1px;
  transition: background .12s ease;
}
.tok.num { color: var(--tok-num); }
.tok:hover { background: color-mix(in srgb, var(--accent) 28%, transparent); }
.tok:focus-visible { outline: 2px solid var(--accent); }
.tok.bad {
  text-decoration: underline wavy var(--amber) 1.5px;
  text-underline-offset: 3px;
}

.term .prompt-line { color: var(--muted); }
.term .result {
  display: block; opacity: 0; transform: translateY(4px);
  transition: opacity .35s ease, transform .35s ease;
}
.term .result.show { opacity: 1; transform: none; }
.term .ok-line { color: var(--ok); font-weight: 600; }
.term .gen { color: var(--text); }
.term .err { color: var(--amber); font-weight: 600; }
.term .ctx { color: var(--muted); }

.breaker-hint { margin-top: 1rem; font-size: .84rem; color: var(--muted); max-width: 72ch; }
.breaker-hint button {
  appearance: none; border: none; background: none; padding: 0;
  font: inherit; color: var(--accent); cursor: pointer;
}
.breaker-hint button:hover { color: var(--accent-strong); text-decoration: underline; }

/* ---------- pager (prev / next) ---------- */

.pager {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  padding: 0 0 3.5rem;
  max-width: 76ch;
}
.pager a {
  border: 1px solid var(--border); border-radius: 14px;
  padding: .85rem 1.15rem;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 var(--edge);
  display: flex; flex-direction: column; gap: .15rem;
  transition: border-color .15s ease, transform .15s ease, box-shadow .2s ease;
}
.pager a:hover {
  text-decoration: none; border-color: var(--border-strong);
  transform: translateY(-1px);
  box-shadow: inset 0 1px 0 var(--edge), 0 10px 32px var(--glow);
}
.pager .dir {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: .7rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--muted);
}
.pager .title { color: var(--text-strong); font-weight: 570; font-size: .95rem; }
.pager .next { text-align: right; align-items: flex-end; grid-column: 2; }
.pager .prev { grid-column: 1; }
@media (max-width: 640px) {
  .pager { grid-template-columns: 1fr; }
  .pager .next, .pager .prev { grid-column: 1; }
}

/* ---------- footer ---------- */

.site-footer {
  position: relative;
  border-top: 1px solid var(--border);
  padding: 3rem 0 3.2rem;
  font-size: .88rem; color: var(--muted);
  background:
    radial-gradient(700px 320px at 88% 100%,
      color-mix(in srgb, var(--accent) 6%, transparent), transparent 70%),
    color-mix(in srgb, var(--bg-raise) 40%, transparent);
}
.site-footer .wrap {
  display: grid; gap: 2.5rem;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr);
}
@media (max-width: 800px) { .site-footer .wrap { grid-template-columns: 1fr; gap: 1.8rem; } }
.site-footer .brand-col .brand { margin-bottom: .7rem; }
.site-footer .footer-teaser { font-style: italic; display: block; margin-top: .5rem; }
.site-footer h4 {
  margin: 0 0 .7rem;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: .7rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); font-weight: 600;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: 0 0 .4rem; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text-strong); }
.site-footer .fineprint {
  grid-column: 1 / -1;
  border-top: 1px solid var(--line-soft);
  padding-top: 1.3rem; margin-top: .5rem;
  font-size: .8rem;
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}