/* Hallmark · genre: modern-minimal · macrostructure: Narrative Workflow · theme: Cobalt · enrichment: code-hero · nav: N13 inline ⌘K · footer: Ft2
 * pre-emit critique: P4 H4 E4 S4 R5 V4
 */

:root {
  --color-paper: oklch(98.5% 0.004 250);
  --color-paper-2: oklch(96.5% 0.006 252);
  --color-ink: oklch(24% 0.02 258);
  --color-ink-2: oklch(34% 0.018 257);
  --color-ink-3: oklch(48% 0.016 257);
  --color-rule: oklch(90% 0.008 252);
  --color-rule-2: oklch(84% 0.01 254);
  --color-accent: oklch(58% 0.2 256);
  --color-accent-ink: oklch(99% 0.004 250);
  --color-accent-soft: oklch(94% 0.04 256);
  --color-graphite: oklch(22% 0.016 260);
  --color-graphite-2: oklch(27% 0.018 260);
  --color-graphite-rule: oklch(36% 0.02 260);
  --color-on-graphite: oklch(92% 0.008 252);
  --color-on-graphite-2: oklch(72% 0.012 255);
  --color-tok-key: oklch(74% 0.14 252);
  --color-tok-str: oklch(86% 0.05 150);
  --color-tok-dim: oklch(62% 0.014 257);
  --color-ok: oklch(78% 0.15 155);
  --color-focus: oklch(58% 0.2 256);

  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 7rem;

  --radius-ctl: 6px;
  --radius-card: 10px;
  --measure: 62ch;
  --wrap: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { overflow-x: clip; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink-2);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; }
code, pre, kbd { font-family: var(--font-mono); }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; border-radius: 3px; }

.wrap { width: min(var(--wrap), 100% - 2rem); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 0; background: var(--color-ink); color: var(--color-paper); padding: .5rem .75rem; z-index: 100; }
.skip:focus { left: .5rem; top: .5rem; }

/* ---------- type ---------- */
h1, h2, h3 { font-family: var(--font-display); color: var(--color-ink); font-style: normal; font-weight: 600; margin: 0; overflow-wrap: anywhere; min-width: 0; }
h1 { font-size: clamp(2.4rem, 4.6vw + 0.6rem, 4.4rem); line-height: 1.04; letter-spacing: -0.035em; }
h2 { font-size: clamp(1.75rem, 2.4vw + 0.8rem, 2.75rem); line-height: 1.1; letter-spacing: -0.028em; }
h3 { font-size: 1.15rem; line-height: 1.3; letter-spacing: -0.015em; }
p { margin: 0; }
.lede { font-size: 1.2rem; line-height: 1.55; color: var(--color-ink-2); max-width: 46ch; }
.eyebrow {
  font: 500 0.75rem/1 var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-3);
  display: flex; align-items: center; gap: .6rem;
}
.eyebrow::before { content: ""; width: 14px; height: 2px; background: var(--color-accent); }
.mono-note { font: 400 0.8125rem/1.5 var(--font-mono); color: var(--color-ink-3); }
.inline-code, p code, li code, td code, dd code {
  font-size: 0.875em;
  background: var(--color-paper-2);
  border: 1px solid var(--color-rule);
  padding: 0.08em 0.38em;
  border-radius: 4px;
  color: var(--color-ink);
  overflow-wrap: anywhere;
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in oklch, var(--color-paper) 86%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-rule);
}
.nav__in { display: flex; align-items: center; gap: var(--space-lg); height: 3.5rem; }
.wordmark { font: 600 1.1rem/1 var(--font-display); letter-spacing: -0.03em; color: var(--color-ink); text-decoration: none; display: inline-flex; align-items: center; gap: .5rem; white-space: nowrap; }
.wordmark svg { width: 20px; height: 20px; }
.nav__links { display: flex; gap: var(--space-md); list-style: none; margin: 0; padding: 0; }
.nav__links a, .link {
  text-decoration: none; color: var(--color-ink-2); font-size: .9375rem; white-space: nowrap;
  background: linear-gradient(var(--color-accent), var(--color-accent)) 0 100% / 0 1.5px no-repeat;
  transition: background-size .25s ease, color .2s;
  padding-bottom: 2px;
}
.nav__links a:hover, .link:hover { background-size: 100% 1.5px; color: var(--color-ink); }
.nav__right { margin-left: auto; display: flex; align-items: center; gap: var(--space-sm); }
.kbd-btn {
  display: inline-flex; align-items: center; gap: .6rem;
  font: 500 .8125rem/1 var(--font-mono); color: var(--color-ink-3);
  background: var(--color-paper); border: 1px solid var(--color-rule-2); border-radius: var(--radius-ctl);
  padding: .5rem .65rem; cursor: pointer; white-space: nowrap;
}
.kbd-btn:hover { border-color: var(--color-accent); color: var(--color-ink); }
.kbd-btn kbd { font: inherit; border: 1px solid var(--color-rule-2); border-radius: 4px; padding: .1rem .35rem; background: var(--color-paper-2); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font: 500 .9375rem/1 var(--font-body); white-space: nowrap;
  border-radius: var(--radius-ctl); padding: .7rem 1.05rem; text-decoration: none; cursor: pointer;
  border: 1px solid transparent; transition: background .2s, border-color .2s, transform .1s;
}
.btn--primary { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--primary:hover { background: oklch(52% 0.2 256); }
.btn--ghost { background: transparent; color: var(--color-ink); border-color: var(--color-rule-2); }
.btn--ghost:hover { border-color: var(--color-accent); }
.btn:active { transform: translateY(1px); }

/* ---------- hero ---------- */
.hero { padding: var(--space-xl) 0 var(--space-2xl); border-bottom: 1px solid var(--color-rule); }
.hero__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); gap: var(--space-xl); align-items: center; }
.hero__copy { display: grid; gap: var(--space-md); }
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-xs); }
.hero__meta { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; margin-top: var(--space-xs); }

/* code cards */
.code-card {
  background: var(--color-graphite); border: 1px solid var(--color-graphite-rule);
  border-radius: var(--radius-card); box-shadow: 0 1px 2px oklch(24% 0.02 258 / 0.05);
  color: var(--color-on-graphite); min-width: 0;
}
.code-card__bar { display: flex; align-items: center; gap: .75rem; padding: .65rem .9rem; border-bottom: 1px solid var(--color-graphite-rule); }
.code-card__name { font: 500 .75rem/1 var(--font-mono); color: var(--color-on-graphite-2); letter-spacing: .02em; }
.status { margin-left: auto; font: 500 .72rem/1 var(--font-mono); letter-spacing: .06em; color: var(--color-ok); }
.code-card pre { margin: 0; padding: 1rem 1.1rem 1.15rem; overflow-x: auto; font-size: .8125rem; line-height: 1.75; tab-size: 2; }
.code-card code { font: inherit; }
.t-key { color: var(--color-tok-key); }
.t-str { color: var(--color-tok-str); }
.t-dim { color: var(--color-tok-dim); }
.t-ok { color: var(--color-ok); }
.t-user { color: var(--color-on-graphite); font-weight: 500; }
.t-cmt { color: var(--color-tok-dim); }
.caret::after { content: ""; display: inline-block; width: .55ch; height: 1.05em; background: var(--color-tok-key); vertical-align: -0.15em; margin-left: 1px; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.copy {
  margin-left: auto; font: 500 .72rem/1 var(--font-mono); letter-spacing: .04em;
  color: var(--color-on-graphite-2); background: transparent; cursor: pointer;
  border: 1px solid var(--color-graphite-rule); border-radius: 4px; padding: .35rem .55rem;
}
.copy:hover { color: var(--color-on-graphite); border-color: var(--color-tok-key); }
.copy[data-done="1"] { color: var(--color-ok); border-color: var(--color-ok); }
.code-card__bar .status + .copy { margin-left: .5rem; }

/* ---------- facts strip ---------- */
.facts { border-bottom: 1px solid var(--color-rule); }
.facts__grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.fact { padding: var(--space-md) var(--space-md) var(--space-md) 0; border-right: 1px solid var(--color-rule); display: grid; gap: .3rem; }
.fact + .fact { padding-left: var(--space-md); }
.fact:last-child { border-right: 0; }
.fact b { font: 600 1.7rem/1 var(--font-display); color: var(--color-ink); letter-spacing: -0.03em; }
.fact span { font-size: .875rem; color: var(--color-ink-3); }

/* ---------- sections ---------- */
section { position: relative; }
.sec { padding: var(--space-2xl) 0; }
.sec--tight { padding: var(--space-xl) 0; }
.sec__head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-lg) var(--space-xl); align-items: end; margin-bottom: var(--space-xl); }
.sec__head .eyebrow { grid-column: 1 / -1; }
.sec__head p { color: var(--color-ink-2); max-width: var(--measure); }

/* steps (narrative workflow) */
.steps { display: grid; gap: 0; border-top: 1px solid var(--color-rule); counter-reset: s; }
.step { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr) minmax(0, 1.2fr); gap: var(--space-lg); padding: var(--space-lg) 0; border-bottom: 1px solid var(--color-rule); align-items: start; }
.step__n { font: 500 .8125rem/1 var(--font-mono); color: var(--color-accent); letter-spacing: .06em; padding-top: .5rem; }
.step__n::before { counter-increment: s; content: "0" counter(s) "."; }
.step h3 { margin-bottom: .5rem; }
.step p { color: var(--color-ink-2); max-width: 44ch; }
.step .code-card { align-self: start; }
.step .code-card pre { font-size: .78rem; }

/* tabs */
.tabs { display: grid; gap: var(--space-md); }
.tablist { display: flex; flex-wrap: wrap; gap: .35rem; border-bottom: 1px solid var(--color-rule); }
.tab {
  font: 500 .875rem/1 var(--font-mono); letter-spacing: .01em; color: var(--color-ink-3); background: none;
  border: 0; border-bottom: 2px solid transparent; padding: .8rem .85rem; cursor: pointer; white-space: nowrap; margin-bottom: -1px;
}
.tab:hover { color: var(--color-ink); }
.tab[aria-selected="true"] { color: var(--color-ink); border-bottom-color: var(--color-accent); }
.panel { display: none; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: var(--space-xl); align-items: start; }
.panel.is-on { display: grid; }
.panel__copy { display: grid; gap: var(--space-sm); }
.panel__copy ul { margin: 0; padding-left: 1.1rem; display: grid; gap: .45rem; }
.panel__copy li::marker { color: var(--color-accent); }
.pill-mono { display: inline-block; font: 500 .7rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; border: 1px solid var(--color-rule-2); color: var(--color-ink-3); padding: .3rem .45rem; border-radius: 4px; width: fit-content; }
.pill-mono--accent { color: var(--color-accent); border-color: var(--color-accent); }
.stack { display: grid; gap: var(--space-sm); min-width: 0; }

/* guides: ledger rows, not tiles */
.ledger { border-top: 1px solid var(--color-rule); }
.ledger a { display: grid; grid-template-columns: 4.5rem minmax(0, 1fr) minmax(0, 1.4fr) 1.5rem; gap: var(--space-md); align-items: baseline; padding: 1.1rem 0; border-bottom: 1px solid var(--color-rule); text-decoration: none; color: inherit; transition: background .2s; }
.ledger a:hover { background: var(--color-paper-2); }
.ledger a:hover .arrow { color: var(--color-accent); transform: translateX(3px); }
.ledger .tag { font: 500 .72rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--color-ink-3); padding-left: .25rem; }
.ledger .ttl { font: 600 1.05rem/1.3 var(--font-display); color: var(--color-ink); letter-spacing: -0.015em; }
.ledger .desc { color: var(--color-ink-2); font-size: .98rem; }
.arrow { color: var(--color-ink-3); transition: transform .2s, color .2s; }

/* agents section: two columns */
.agents { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--space-xl); align-items: start; }
.agents__list { display: grid; gap: var(--space-md); }
.agents__list > div { border-top: 1px solid var(--color-rule); padding-top: var(--space-sm); display: grid; gap: .35rem; }
.agents__list h3 { font-size: 1rem; }
.agents__list p { font-size: .98rem; }

/* dark band */
.band { background: var(--color-graphite); color: var(--color-on-graphite); padding: var(--space-2xl) 0; }
.band h2 { color: var(--color-on-graphite); }
.band .eyebrow { color: var(--color-on-graphite-2); }
.band .eyebrow::before { background: var(--color-tok-key); }
.band p { color: var(--color-on-graphite-2); }
.cmds { width: 100%; border-collapse: collapse; font-size: .95rem; }
.cmds th { text-align: left; font: 500 .72rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--color-on-graphite-2); padding: 0 var(--space-md) var(--space-sm) 0; border-bottom: 1px solid var(--color-graphite-rule); }
.cmds td { padding: .85rem var(--space-md) .85rem 0; border-bottom: 1px solid var(--color-graphite-rule); vertical-align: top; color: var(--color-on-graphite-2); }
.cmds td:first-child { white-space: nowrap; }
.cmds code { font-size: .85rem; color: var(--color-tok-key); background: none; border: 0; padding: 0; }
.cmds td code { background: none; border: 0; color: var(--color-tok-key); }
.band-grid { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.4fr); gap: var(--space-xl); align-items: start; }
.band-grid > div:first-child { display: grid; gap: var(--space-md); position: sticky; top: 5rem; }
.table-scroll { overflow-x: auto; }
.table-scroll table { min-width: 480px; }

/* resources */
.res { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--space-md); }
.res a { text-decoration: none; color: inherit; border: 1px solid var(--color-rule); border-radius: var(--radius-card); padding: var(--space-md); display: grid; gap: .45rem; align-content: start; transition: border-color .2s; min-width: 0; }
.res a:hover { border-color: var(--color-accent); }
.res a:hover .rtl { color: var(--color-accent); }
.res .rk { font: 500 .7rem/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--color-ink-3); }
.res .rtl { font: 600 1.05rem/1.25 var(--font-display); color: var(--color-ink); letter-spacing: -0.015em; overflow-wrap: anywhere; transition: color .2s; }
.res .rd { font-size: .9rem; color: var(--color-ink-2); }
.res .rc { font: 400 .78rem/1.4 var(--font-mono); color: var(--color-ink-3); overflow-wrap: anywhere; }
.r-4 { grid-column: span 4; }
.r-6 { grid-column: span 6; }
.r-3 { grid-column: span 3; }

/* faq */
.faq { border-top: 1px solid var(--color-rule); }
.faq details { border-bottom: 1px solid var(--color-rule); }
.faq summary { cursor: pointer; list-style: none; padding: 1.1rem 0; font: 600 1.05rem/1.35 var(--font-display); color: var(--color-ink); letter-spacing: -0.012em; display: flex; justify-content: space-between; gap: var(--space-md); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 1.4rem/1 var(--font-mono); color: var(--color-accent); }
.faq details[open] summary::after { content: "–"; }
.faq .ans { padding: 0 0 1.25rem; max-width: var(--measure); display: grid; gap: .6rem; }
.faq-grid { display: grid; grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr); gap: var(--space-xl); }
.faq-grid > div:first-child { display: grid; gap: var(--space-md); align-content: start; }

/* footer */
.foot { border-top: 1px solid var(--color-rule); padding: var(--space-lg) 0 var(--space-xl); }
.foot__in { display: flex; flex-wrap: wrap; gap: .5rem var(--space-lg); justify-content: space-between; font: 400 .8125rem/1.5 var(--font-mono); color: var(--color-ink-3); }
.foot a { color: var(--color-ink-3); }
.foot a:hover { color: var(--color-ink); }

/* palette */
.pal { position: fixed; inset: 0; z-index: 60; display: none; align-items: flex-start; justify-content: center; padding: 12vh 1rem 1rem; background: oklch(22% 0.016 260 / 0.45); }
.pal.is-open { display: flex; }
.pal__box { width: min(560px, 100%); background: var(--color-paper); border: 1px solid var(--color-rule-2); border-radius: var(--radius-card); box-shadow: 0 1px 2px oklch(24% 0.02 258 / 0.05), 0 18px 40px -20px oklch(22% 0.016 260 / 0.5); overflow: hidden; }
.pal__in { width: 100%; border: 0; border-bottom: 1px solid var(--color-rule); padding: 1rem 1.1rem; font: 400 .95rem/1 var(--font-mono); background: transparent; color: var(--color-ink); outline: none; }
.pal__list { list-style: none; margin: 0; padding: .4rem; max-height: 50vh; overflow: auto; }
.pal__list a { display: flex; justify-content: space-between; gap: 1rem; padding: .65rem .7rem; border-radius: 6px; text-decoration: none; color: var(--color-ink-2); font-size: .95rem; }
.pal__list a small { font: 500 .7rem/1.6 var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--color-ink-3); }
.pal__list a[aria-selected="true"] { background: var(--color-accent-soft); color: var(--color-ink); }
.pal__empty { padding: 1rem 1.1rem; color: var(--color-ink-3); font-size: .9rem; }

/* reveal */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(10px); transition: opacity .6s cubic-bezier(0.16, 1, 0.3, 1), transform .6s cubic-bezier(0.16, 1, 0.3, 1); }
  .reveal.is-in { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) { .caret::after { animation: none; } html { scroll-behavior: auto; } }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero__grid, .sec__head, .panel.is-on, .agents, .band-grid, .faq-grid { grid-template-columns: minmax(0, 1fr); }
  .band-grid > div:first-child { position: static; }
  .step { grid-template-columns: 3.5rem minmax(0, 1fr); }
  .step .code-card { grid-column: 2; }
  .facts__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fact:nth-child(2) { border-right: 0; }
  .fact:nth-child(3) { padding-left: 0; }
  .fact:nth-child(n+3) { border-top: 1px solid var(--color-rule); }
  .r-4, .r-6, .r-3 { grid-column: span 6; }
  .nav__links { display: none; }
}
@media (max-width: 640px) {
  .sec { padding: var(--space-xl) 0; }
  .hero { padding: var(--space-lg) 0 var(--space-xl); }
  .ledger a { grid-template-columns: minmax(0, 1fr) 1.5rem; gap: .25rem var(--space-sm); }
  .ledger .tag { grid-column: 1; padding-left: 0; }
  .ledger .ttl { grid-column: 1; }
  .ledger .desc { grid-column: 1; }
  .ledger .arrow { grid-column: 2; grid-row: 1 / span 3; align-self: center; }
  .r-4, .r-6, .r-3 { grid-column: 1 / -1; }
  .kbd-btn span { display: none; }
  .nav__right .btn { padding: .6rem .8rem; }
  .step { grid-template-columns: minmax(0, 1fr); gap: var(--space-sm); }
  .step .code-card { grid-column: 1; }
  .step__n { padding-top: 0; }
  .tablist { overflow-x: auto; flex-wrap: nowrap; }
}

/* section variants and small utilities (kept out of inline styles for the CSP) */
.hero__card { margin: 0; }
.sec--ruled { border-top: 1px solid var(--color-rule); }
.sec--tint { background: var(--color-paper-2); border-top: 1px solid var(--color-rule); border-bottom: 1px solid var(--color-rule); }
.table-scroll--gap { margin-top: var(--space-lg); }
.band code.on-dark { background: none; border: 1px solid var(--color-graphite-rule); color: var(--color-tok-key); }