/* ============================================================
   KIRRA SYSTEMS — design system
   Build-free, dependency-free. Dark is the brand default; light
   is a first-class theme. Every text token ≥ 4.5:1 (WCAG AA),
   chart palettes validated for CVD separation.
   ============================================================ */

/* ---------- Fonts (self-hosted variable, latin subset) ---------- */
@font-face {
  font-family: "Space Grotesk";
  src: url("../fonts/space-grotesk-var-latin.woff2") format("woff2");
  font-weight: 300 700;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Inter";
  src: url("../fonts/inter-var-latin.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-var-latin.woff2") format("woff2");
  font-weight: 100 800;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ---------- Tokens ---------- */
:root {
  color-scheme: dark;
  --bg: #05070d;
  --bg-2: #070b14;
  --surface: #0a0f1a;
  --surface-2: #0f1626;
  --surface-3: #141d31;
  --line: rgba(151, 168, 195, 0.14);
  --line-strong: rgba(151, 168, 195, 0.26);
  --ink: #e8eef7;
  --ink-2: #a7b4c6;
  --ink-3: #8a97ab;
  --accent: #3fd9c9;          /* signal cyan — text on bg: 11.5:1 */
  --accent-strong: #63e6d8;
  --accent-soft: rgba(63, 217, 201, 0.12);
  --accent-line: rgba(63, 217, 201, 0.35);
  --ok: #3ecf8e;
  --warn: #e8a33d;
  --danger: #f0655d;
  --danger-soft: rgba(240, 101, 93, 0.12);
  --chart-1: #16a99a;
  --chart-2: #8a76f0;
  --chart-3: #c1832a;
  --chart-4: #3e86de;
  --glow: 0 0 40px rgba(63, 217, 201, 0.18);
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 32px rgba(0, 0, 0, 0.35);
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --radius: 12px;
  --radius-lg: 18px;
  --container: 1200px;
  --nav-h: 64px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.4, 0.44, 1);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f8fb;
  --bg-2: #eef2f7;
  --surface: #ffffff;
  --surface-2: #f2f5f9;
  --surface-3: #e8edf4;
  --line: rgba(24, 42, 68, 0.12);
  --line-strong: rgba(24, 42, 68, 0.24);
  --ink: #0c1524;
  --ink-2: #46566c;
  --ink-3: #5b6b80;
  --accent: #0a7466;          /* on paper: 5.3:1 */
  --accent-strong: #086055;
  --accent-soft: rgba(10, 116, 102, 0.10);
  --accent-line: rgba(10, 116, 102, 0.35);
  --ok: #0a6e40;
  --warn: #8a5a00;
  --danger: #c0392b;
  --danger-soft: rgba(192, 57, 43, 0.10);
  --chart-1: #0b8d7d;
  --chart-2: #6d5bd0;
  --chart-3: #b0731a;
  --chart-4: #2569c3;
  --glow: none;
  --shadow-1: 0 1px 2px rgba(15, 32, 56, 0.06), 0 10px 30px rgba(15, 32, 56, 0.08);
}

/* ---------- Reset (lite) ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
html:focus-within { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}
img, svg, canvas, video { display: block; max-width: 100%; }
input, button, select { font: inherit; }
a { color: inherit; }
:target { scroll-margin-top: calc(var(--nav-h) + 24px); }

::selection { background: var(--accent); color: var(--bg); }

/* Focus — always visible, never removed */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed; top: -60px; left: 16px; z-index: 300;
  background: var(--accent); color: var(--bg);
  padding: 10px 18px; border-radius: 8px; font-weight: 600;
  text-decoration: none; transition: top 0.2s var(--ease-out);
}
.skip-link:focus { top: 12px; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.6rem, 1.2rem + 6vw, 5.4rem); }
h2 { font-size: clamp(1.9rem, 1.2rem + 2.6vw, 3.1rem); }
h3 { font-size: clamp(1.25rem, 1.05rem + 0.8vw, 1.6rem); letter-spacing: -0.01em; }
h4 { font-size: 1.05rem; letter-spacing: 0; }
p  { max-width: 68ch; }
.lede { font-size: clamp(1.08rem, 1rem + 0.55vw, 1.35rem); color: var(--ink-2); line-height: 1.6; }
.muted { color: var(--ink-2); }
.dim { color: var(--ink-3); }
small { font-size: 0.86rem; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.22em; text-transform: uppercase; color: var(--accent);
}
.eyebrow::before {
  content: ""; width: 22px; height: 1px; background: var(--accent-line); flex: none;
}

code, .mono { font-family: var(--font-mono); font-size: 0.92em; }
p code, li code, td code {
  background: var(--surface-2); border: 1px solid var(--line);
  padding: 0.08em 0.38em; border-radius: 6px; font-size: 0.85em;
  white-space: nowrap;
}

/* ---------- Layout ---------- */
.container { width: min(var(--container), 100% - 40px); margin-inline: auto; }
.container--narrow { width: min(880px, 100% - 40px); margin-inline: auto; }
section { padding-block: clamp(64px, 10vh, 128px); position: relative; }
.section-head { max-width: 780px; margin-bottom: clamp(32px, 5vh, 56px); }
.section-head .eyebrow { margin-bottom: 18px; }
.section-head p { margin-top: 16px; }

.grid { display: grid; gap: 20px; }
.grid > * { min-width: 0; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 760px) { .grid--2 { grid-template-columns: 1fr; } }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); }

hr.rule { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* ---------- Nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 200;
  height: var(--nav-h);
  display: flex; align-items: center;
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.nav.is-scrolled {
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom-color: var(--line);
}
.nav__inner {
  width: min(var(--container), 100% - 40px); margin-inline: auto;
  display: flex; align-items: center; gap: 28px;
}
.nav__brand {
  display: flex; align-items: center; gap: 10px; text-decoration: none;
  font-family: var(--font-display); font-weight: 700; letter-spacing: 0.14em;
  font-size: 0.98rem;
}
.nav__brand svg { width: 26px; height: 26px; }
.nav__links { display: flex; gap: 4px; margin-left: auto; align-items: center; }
.nav__links a {
  text-decoration: none; color: var(--ink-2); font-size: 0.92rem; font-weight: 500;
  padding: 8px 12px; border-radius: 8px; transition: color 0.2s, background 0.2s;
}
.nav__links a:hover, .nav__links a[aria-current="page"] { color: var(--ink); background: var(--surface-2); }
.nav__cta {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; font-size: 0.9rem; font-weight: 600;
  color: var(--ink); border: 1px solid var(--line-strong);
  padding: 8px 16px; border-radius: 999px; transition: border-color 0.2s, background 0.2s;
  white-space: nowrap;
}
.nav__cta:hover { border-color: var(--accent-line); background: var(--accent-soft); }
.theme-toggle {
  background: none; border: 1px solid var(--line); color: var(--ink-2);
  width: 38px; height: 38px; border-radius: 999px; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--line-strong); }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }

.nav__burger {
  display: none; background: none; border: 1px solid var(--line); color: var(--ink);
  width: 38px; height: 38px; border-radius: 8px; cursor: pointer;
  align-items: center; justify-content: center;
}
@media (max-width: 880px) {
  .nav__links {
    display: none;
    position: fixed; inset: var(--nav-h) 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 12px 20px 20px;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: 12px 14px; font-size: 1rem; }
  .nav__burger { display: inline-flex; margin-left: auto; }
  .nav__cta span.label { display: none; }
}

/* Sub-navigation strip (technology pages) */
.subnav {
  position: sticky; top: var(--nav-h); z-index: 150;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.subnav__inner {
  width: min(var(--container), 100% - 40px); margin-inline: auto;
  display: flex; gap: 2px; overflow-x: auto; scrollbar-width: none;
  padding-block: 8px;
}
.subnav__inner::-webkit-scrollbar { display: none; }
.subnav a {
  flex: none; text-decoration: none; color: var(--ink-3);
  font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.04em;
  padding: 6px 12px; border-radius: 999px; transition: color 0.2s, background 0.2s;
}
.subnav a:hover { color: var(--ink); }
.subnav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 600; font-size: 0.98rem; text-decoration: none;
  padding: 13px 26px; border-radius: 999px; cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease-spring), background 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--accent); color: #041210; box-shadow: var(--glow); }
.btn--primary:hover { background: var(--accent-strong); }
:root[data-theme="light"] .btn--primary { color: #ffffff; }
.btn--ghost { border-color: var(--line-strong); color: var(--ink); }
.btn--ghost:hover { border-color: var(--accent-line); background: var(--accent-soft); }
.btn .arrow { transition: transform 0.25s var(--ease-out); }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100svh;
  display: grid; align-content: center;
  padding-block: calc(var(--nav-h) + 48px) 64px;
  position: relative;
  overflow: clip;
}
.hero__canvas {
  position: absolute; inset: 0; z-index: -1;
  width: 100%; height: 100%;
  background:
    radial-gradient(1100px 520px at 78% 18%, var(--accent-soft), transparent 60%),
    radial-gradient(800px 600px at 12% 85%, rgba(138, 118, 240, 0.07), transparent 60%),
    var(--bg);
}
.hero__eyebrow { margin-bottom: 26px; }
.hero h1 { max-width: 15ch; }
.hero h1 .accent { color: var(--accent); }
.hero .lede { margin-top: 26px; max-width: 62ch; }
.hero__ctas { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.hero__proof {
  margin-top: clamp(40px, 7vh, 72px);
  display: flex; flex-wrap: wrap; gap: 10px 28px;
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-3);
}
.hero__proof span { display: inline-flex; align-items: center; gap: 8px; }
.hero__proof .tick { color: var(--accent); }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 26px;
  position: relative;
  transition: border-color 0.3s, transform 0.3s var(--ease-out), box-shadow 0.3s;
}
.card:hover { border-color: var(--line-strong); }
a.card { display: block; text-decoration: none; }
a.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-1); border-color: var(--accent-line); }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--ink-2); font-size: 0.95rem; }
.card__icon {
  width: 40px; height: 40px; border-radius: 10px;
  background: var(--accent-soft); color: var(--accent);
  display: grid; place-items: center; margin-bottom: 18px;
}
.card__more {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 16px;
  color: var(--accent); font-size: 0.9rem; font-weight: 600;
}
.card--flush { padding: 0; overflow: clip; }

/* ---------- Evidence chips — the site's signature element ---------- */
.evidence {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 0.74rem;
  color: var(--ink-3);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 6px; padding: 3px 9px;
  text-decoration: none;
  max-width: 100%;
  min-width: 0;
  overflow-wrap: anywhere;
  transition: color 0.2s, border-color 0.2s;
}
.evidence::before { content: "▸"; color: var(--accent); font-size: 0.7em; }
a.evidence:hover { color: var(--accent); border-color: var(--accent-line); }
.evidence-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.evidence-note {
  font-size: 0.82rem; color: var(--ink-3); margin-top: 10px; max-width: none;
}

/* ---------- Stat tiles ---------- */
.stats { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: clip; }
.stats--4 { grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); }
.stat { background: var(--surface); padding: 26px 24px; }
.stat__value {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.9rem, 1.4rem + 1.8vw, 2.9rem); line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.stat__value .unit { font-size: 0.5em; color: var(--ink-3); font-weight: 500; margin-left: 2px; }
.stat__label { margin-top: 10px; color: var(--ink-2); font-size: 0.9rem; }
.stat__evidence { margin-top: 10px; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 640px; }
.tbl th, .tbl td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl th {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3);
  background: var(--surface-2);
}
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl tbody tr { background: var(--surface); }
.tbl td { color: var(--ink-2); }
.tbl td:first-child { color: var(--ink); font-weight: 500; }

/* status pills — never color-alone (text carries meaning) */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500;
  padding: 2px 10px; border-radius: 999px; white-space: nowrap;
}
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.pill--live { color: var(--ok); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.pill--gated { color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.pill--rnd { color: var(--chart-2); background: color-mix(in srgb, var(--chart-2) 10%, transparent); }
.pill--deny { color: var(--danger); background: var(--danger-soft); }

/* ---------- Code blocks ---------- */
.codeblock {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: clip;
  font-size: 0.85rem;
}
:root[data-theme="light"] .codeblock { background: #0c1524; border-color: #0c1524; }
.codeblock__bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px; border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3);
}
:root[data-theme="light"] .codeblock__bar { color: #8a97ab; border-color: rgba(151,168,195,.18); }
.codeblock pre {
  margin: 0; padding: 16px 18px; overflow-x: auto;
  font-family: var(--font-mono); line-height: 1.7; color: var(--ink-2);
}
:root[data-theme="light"] .codeblock pre { color: #c7d2e2; }
.codeblock .tok-k { color: var(--accent); }
:root[data-theme="light"] .codeblock .tok-k { color: #3fd9c9; }
.codeblock .tok-c { color: var(--ink-3); }
:root[data-theme="light"] .codeblock .tok-c { color: #8a97ab; }
.codeblock .tok-s { color: var(--chart-3); }
:root[data-theme="light"] .codeblock .tok-s { color: #d9a05b; }
.copy-btn {
  background: none; border: 1px solid var(--line); border-radius: 6px;
  color: inherit; font-family: var(--font-mono); font-size: 0.7rem;
  padding: 3px 10px; cursor: pointer; transition: color 0.2s, border-color 0.2s;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent-line); }

/* ---------- Pipeline / diagram shared styles ---------- */
.diagram-frame {
  background:
    radial-gradient(700px 300px at 50% 0%, var(--accent-soft), transparent 70%),
    var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(18px, 3vw, 36px);
  overflow-x: auto;
}
.diagram-frame svg { min-width: 560px; width: 100%; height: auto; }
.diagram-caption {
  margin-top: 14px; font-size: 0.85rem; color: var(--ink-3); max-width: none;
  display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center;
}
.dg-box  { fill: var(--surface-2); stroke: var(--line-strong); rx: 8; }
.dg-box--accent { fill: var(--accent-soft); stroke: var(--accent-line); }
.dg-box--deny { fill: var(--danger-soft); stroke: var(--danger); }
.dg-label { fill: var(--ink); font-family: var(--font-body); font-size: 13px; font-weight: 600; }
.dg-sub   { fill: var(--ink-3); font-family: var(--font-mono); font-size: 10px; }
.dg-mono  { fill: var(--ink-2); font-family: var(--font-mono); font-size: 11px; }
.dg-edge  { stroke: var(--line-strong); fill: none; stroke-width: 1.5; }
.dg-edge--flow { stroke: var(--accent); }
.dg-edge--deny { stroke: var(--danger); stroke-dasharray: 4 4; }
.dg-dot { fill: var(--accent); }
.dg-dot--deny { fill: var(--danger); }

/* animated packets travelling along paths */
@keyframes dash-flow { to { stroke-dashoffset: -200; } }
.flow-anim .dg-edge--flow {
  stroke-dasharray: 6 14; stroke-dashoffset: 0;
  animation: dash-flow 6s linear infinite;
}
@keyframes pulse-glow { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }
.flow-anim .dg-pulse { animation: pulse-glow 2.4s ease-in-out infinite; }

/* ---------- Interactive posture switch (safety pipeline) ---------- */
.posture-switch {
  display: inline-flex; gap: 4px; padding: 4px;
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px;
}
.posture-switch button {
  border: 0; background: none; cursor: pointer;
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500;
  color: var(--ink-2); padding: 7px 16px; border-radius: 999px;
  transition: background 0.2s, color 0.2s;
}
.posture-switch button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow-1); }
.posture-switch button[data-posture="nominal"][aria-pressed="true"]   { color: var(--ok); }
.posture-switch button[data-posture="degraded"][aria-pressed="true"]  { color: var(--warn); }
.posture-switch button[data-posture="lockedout"][aria-pressed="true"] { color: var(--danger); }

/* rows in the route-verdict table that flip with posture */
.verdict { font-family: var(--font-mono); font-size: 0.8rem; font-weight: 500; }
.verdict--allow::before { content: "● "; color: var(--ok); }
.verdict--allow { color: var(--ok); }
.verdict--gate::before { content: "◐ "; color: var(--warn); }
.verdict--gate { color: var(--warn); }
.verdict--deny::before { content: "○ "; color: var(--danger); }
.verdict--deny { color: var(--danger); }

/* ---------- Tabs (architecture explorer) ---------- */
.tabs { border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: clip; background: var(--surface); }
.tabs__list {
  display: flex; overflow-x: auto; scrollbar-width: none;
  border-bottom: 1px solid var(--line); background: var(--surface-2);
}
.tabs__list::-webkit-scrollbar { display: none; }
.tabs__list [role="tab"] {
  flex: none; border: 0; background: none; cursor: pointer;
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-3);
  padding: 14px 20px; border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.tabs__list [role="tab"]:hover { color: var(--ink); }
.tabs__list [role="tab"][aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.tabs__panel { padding: clamp(20px, 3vw, 34px); }
.tabs__panel[hidden] { display: none; }
.tabs__panel h3 { margin-bottom: 8px; }
.tabs__panel > p { color: var(--ink-2); }

/* Sticky side column — only when the two-column layout actually exists;
   on narrow viewports the grid stacks and a pinned heading would sit
   under the scrolling content. */
.sticky-col { margin-bottom: 0; }
@media (min-width: 980px) {
  .sticky-col { position: sticky; top: calc(var(--nav-h) + 24px); }
}

/* ---------- Timeline (scrolling data-flow) ---------- */
.timeline { position: relative; padding-left: 36px; }
.timeline::before {
  content: ""; position: absolute; left: 10px; top: 6px; bottom: 6px;
  width: 2px; background: linear-gradient(var(--accent), var(--line));
  opacity: 0.5;
}
.timeline__item { position: relative; padding-bottom: clamp(28px, 4vh, 44px); }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: ""; position: absolute; left: -33px; top: 7px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--accent);
}
.timeline__step {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 6px;
}
.timeline__item h3 { font-size: 1.15rem; margin-bottom: 6px; }
.timeline__item p { color: var(--ink-2); font-size: 0.95rem; }

/* ---------- Charts (validated palette; thin marks; 2px gaps) ---------- */
.chart { border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); padding: 24px; }
.chart__title { font-family: var(--font-body); font-weight: 600; font-size: 0.98rem; }
.chart__sub { font-size: 0.82rem; color: var(--ink-3); margin-top: 2px; }
.chart__body { margin-top: 18px; }
.barlist { display: grid; gap: 12px; }
.barlist__row { display: grid; grid-template-columns: minmax(120px, 200px) 1fr auto; align-items: center; gap: 14px; font-size: 0.86rem; }
.barlist__label { color: var(--ink-2); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.barlist__track { height: 10px; background: var(--surface-3); border-radius: 4px; overflow: clip; }
.barlist__fill {
  height: 100%; border-radius: 4px 4px 4px 4px; background: var(--chart-1);
  width: var(--w, 0%); transition: width 1.1s var(--ease-out);
}
.barlist__value { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink); font-variant-numeric: tabular-nums; }
/* budget bar: measured vs ceiling */
.budget { display: grid; gap: 8px; }
.budget__track { position: relative; height: 14px; background: var(--surface-3); border-radius: 5px; }
.budget__fill { position: absolute; inset: 0 auto 0 0; border-radius: 5px; background: var(--chart-1); width: var(--w, 0%); transition: width 1.1s var(--ease-out); }
.budget__limit { position: absolute; top: -5px; bottom: -5px; width: 2px; background: var(--danger); left: var(--limit, 100%); }
.budget__legend { display: flex; gap: 18px; font-size: 0.8rem; color: var(--ink-3); font-family: var(--font-mono); flex-wrap: wrap; }
.budget__legend .k { display: inline-flex; align-items: center; gap: 6px; }
.budget__legend .swatch { width: 10px; height: 10px; border-radius: 3px; }

/* ---------- Playground form ---------- */
.field { display: grid; gap: 6px; }
.field label { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--ink-3); text-transform: uppercase; }
.field input, .field select {
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 8px;
  color: var(--ink); font-family: var(--font-mono); font-size: 0.95rem;
  padding: 10px 12px; width: 100%;
}
.field input:focus-visible, .field select:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.preset-row { display: flex; flex-wrap: wrap; gap: 8px; }
.preset {
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px;
  color: var(--ink-2); font-family: var(--font-mono); font-size: 0.74rem;
  padding: 6px 14px; cursor: pointer; transition: color 0.2s, border-color 0.2s;
}
.preset:hover { color: var(--accent); border-color: var(--accent-line); }
.verdict-panel {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--surface); padding: 28px; min-height: 220px;
  display: grid; align-content: center; gap: 12px;
}
.verdict-panel[data-kind="allow"] { border-color: color-mix(in srgb, var(--ok) 45%, transparent); }
.verdict-panel[data-kind="clamp"] { border-color: color-mix(in srgb, var(--warn) 45%, transparent); }
.verdict-panel[data-kind="deny"]  { border-color: color-mix(in srgb, var(--danger) 55%, transparent); background: var(--danger-soft); }
.verdict-panel__tag {
  font-family: var(--font-display); font-weight: 700; letter-spacing: -0.01em;
  font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.2rem); line-height: 1.1;
}
.verdict-panel[data-kind="allow"] .verdict-panel__tag { color: var(--ok); }
.verdict-panel[data-kind="clamp"] .verdict-panel__tag { color: var(--warn); }
.verdict-panel[data-kind="deny"]  .verdict-panel__tag { color: var(--danger); }
.verdict-panel__code { font-family: var(--font-mono); font-size: 0.8rem; color: var(--ink-2); }
.verdict-panel__why { color: var(--ink-2); font-size: 0.95rem; max-width: none; }

/* ---------- Accordion (native details) ---------- */
.acc { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.acc + .acc { margin-top: 10px; }
.acc summary {
  cursor: pointer; list-style: none; display: flex; align-items: center; gap: 12px;
  padding: 18px 22px; font-weight: 600; font-family: var(--font-display); font-size: 1.02rem;
}
.acc summary::-webkit-details-marker { display: none; }
.acc summary::after {
  content: "+"; margin-left: auto; color: var(--accent);
  font-family: var(--font-mono); font-size: 1.1rem; transition: transform 0.3s var(--ease-out);
}
.acc[open] summary::after { transform: rotate(45deg); }
.acc__body { padding: 0 22px 20px; color: var(--ink-2); font-size: 0.95rem; }

/* ---------- Comparison strip ---------- */
.compare-note {
  border-left: 3px solid var(--accent); background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 22px; font-size: 0.94rem; color: var(--ink-2);
  max-width: none;
}

/* ---------- Page hero (subpages) ---------- */
.page-hero {
  padding-top: calc(var(--nav-h) + clamp(56px, 10vh, 110px));
  padding-bottom: clamp(36px, 6vh, 72px);
  position: relative; overflow: clip;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: radial-gradient(900px 420px at 80% 0%, var(--accent-soft), transparent 65%);
}
.page-hero h1 { font-size: clamp(2.2rem, 1.4rem + 3.6vw, 4rem); max-width: 20ch; }
.page-hero .lede { margin-top: 20px; }

/* ---------- CTA band ---------- */
.cta-band {
  border-top: 1px solid var(--line);
  background:
    radial-gradient(800px 300px at 50% 120%, var(--accent-soft), transparent 70%),
    var(--bg-2);
  text-align: center;
}
.cta-band h2 { max-width: 22ch; margin-inline: auto; }
.cta-band .lede { margin: 18px auto 0; }
.cta-band .hero__ctas { justify-content: center; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); background: var(--bg-2); padding-block: 56px 40px; }
.footer__grid { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr); gap: 32px; }
@media (max-width: 980px) { .footer__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .footer__grid { grid-template-columns: 1fr; } }
.footer h3 {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3);
  margin-bottom: 14px;
}
.footer ul { list-style: none; padding: 0; display: grid; gap: 8px; }
.footer a { color: var(--ink-2); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
.footer a:hover { color: var(--accent); }
.footer__brand p { color: var(--ink-3); font-size: 0.88rem; margin-top: 12px; max-width: 34ch; }
.footer__meta {
  margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center;
  color: var(--ink-3); font-size: 0.82rem;
}
.footer__meta .mono { font-size: 0.76rem; }

/* ---------- Preloader (homepage, once per session) ---------- */
.preloader {
  position: fixed; inset: 0; z-index: 400;
  background: var(--bg);
  display: grid; place-items: center;
  transition: opacity 0.5s var(--ease-out), visibility 0.5s;
}
.preloader.is-done { opacity: 0; visibility: hidden; }
html.is-preloading { overflow: hidden; }
.preloader__inner { display: grid; justify-items: center; gap: 22px; width: min(320px, 80vw); }
.preloader__mark { position: relative; width: 68px; height: 68px; display: grid; place-items: center; }
.preloader__mark svg { width: 34px; height: 34px; }
.preloader__ring {
  position: absolute; inset: 0; border-radius: 50%;
  border: 1px solid var(--line-strong); border-top-color: var(--accent);
  animation: pre-spin 0.9s linear infinite;
}
@keyframes pre-spin { to { transform: rotate(360deg); } }
.preloader__bar { width: 100%; height: 2px; background: var(--surface-3); border-radius: 2px; overflow: hidden; }
.preloader__bar span { display: block; height: 100%; width: 0%; background: var(--accent); }
.preloader__meta {
  width: 100%; display: flex; justify-content: space-between; gap: 16px;
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.18em; color: var(--ink-3);
}
#preloaderPct { color: var(--accent); font-variant-numeric: tabular-nums; }

/* ---------- Reveal animations ---------- */
[data-reveal] {
  opacity: 0; transform: translateY(22px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- Article / prose (field notes, docs) ---------- */
.prose h2 { font-size: 1.6rem; margin: 2.2em 0 0.6em; }
.prose h3 { margin: 1.8em 0 0.5em; }
.prose p + p { margin-top: 1em; }
.prose ul, .prose ol { color: var(--ink-2); padding-left: 1.3em; display: grid; gap: 6px; }

.notes-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr)); }
.note-card { display: flex; flex-direction: column; text-decoration: none; }
.note-card__img {
  aspect-ratio: 16 / 9; border-radius: 10px; overflow: clip;
  background: var(--surface-3); margin-bottom: 16px;
}
.note-card__img img { width: 100%; height: 100%; object-fit: cover; }
.note-card time { font-family: var(--font-mono); font-size: 0.74rem; color: var(--ink-3); }
.note-card h3 { font-size: 1.12rem; margin: 8px 0 8px; }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .flow-anim .dg-edge--flow { animation: none; }
}

/* ---------- Print ---------- */
@media print {
  .nav, .subnav, .footer, .hero__canvas, .theme-toggle { display: none !important; }
  body { background: #fff; color: #000; }
}