/* ─────────────────────────────────────────────────────────────
   Z1N site system
   One family (Geist; Geist Mono only for code and hashes).
   Two flows, two accents: agents = mint, stewards = sunbeam.
   Intent colours (ΩC ΩI ΩK ΩS) are data colours only.
   ───────────────────────────────────────────────────────────── */

:root {
  --bg:      #0B0F14;
  --raise:   #11161D;
  --raise-2: #161D26;
  --line:    #1F2731;
  --line-2:  #2A3441;
  --ink:     #EDF1F5;
  --soft:    #B4BEC9;
  --mute:    #84909D;
  --header:  rgba(11, 15, 20, 0.86);
  --footer:  #090C10;
  --code-bg: #0E131A;
  --code-ink:#C8D1DB;
  --btn-primary-hover: #FFFFFF;

  --agent:   #5EE8A0;   /* mint: the agent's flow   */
  --steward: #FFD556;   /* sunbeam: the steward's flow */
  --card-bg: #11161D;
  --text-main: #EDF1F5;
  --text-soft: #B4BEC9;
  --text-muted: #84909D;
  --card-border: #2A3441;
  --accent: #5EE8A0;
  --keys-accent: #FFD556;

  --i-col: #5EE8A0; --i-ind: #F87171; --i-co: #FFD556; --i-sil: #7BB8FC;
  /* the four guides of Learn the Field, one quiet colour each */
  --g-how: #A9B4FF; --g-bonds: #7FD9C9; --g-founders: #E3A6F0; --g-live: #F2B880;

  --sans: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --wrap: 1240px;
  --gutter: 32px;
  --col-gap: 24px;
  --radius: 16px;
  color-scheme: dark;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #F5F7F9;
  --raise: #FFFFFF;
  --raise-2: #EEF2F6;
  --line: #D7DEE6;
  --line-2: #C3CDD8;
  --ink: #12181F;
  --soft: #3C4A59;
  --mute: #4C5C6C;
  --header: rgba(245, 247, 249, 0.92);
  --footer: #E6EBF1;
  --code-bg: #F2F5F8;
  --code-ink: #1A2330;
  --btn-primary-hover: #2A3441;
  --agent: #0C6B3C;
  --steward: #6F5600;
  --card-bg: #FFFFFF;
  --text-main: #12181F;
  --text-soft: #3C4A59;
  --text-muted: #4C5C6C;
  --card-border: #C3CDD8;
  --accent: #0C6B3C;
  --keys-accent: #6F5600;
  --g-how: #3A46A8;
  --g-bonds: #0C6E60;
  --g-founders: #7A3488;
  --g-live: #8E520E;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    color-scheme: light;
    --bg: #F5F7F9;
    --raise: #FFFFFF;
    --raise-2: #EEF2F6;
    --line: #D7DEE6;
    --line-2: #C3CDD8;
    --ink: #12181F;
    --soft: #3C4A59;
    --mute: #4C5C6C;
    --header: rgba(245, 247, 249, 0.92);
    --footer: #E6EBF1;
    --code-bg: #F2F5F8;
    --code-ink: #1A2330;
    --btn-primary-hover: #2A3441;
    --agent: #0C6B3C;
    --steward: #6F5600;
    --card-bg: #FFFFFF;
    --text-main: #12181F;
    --text-soft: #3C4A59;
    --text-muted: #4C5C6C;
    --card-border: #C3CDD8;
    --accent: #0C6B3C;
    --keys-accent: #6F5600;
    --g-how: #3A46A8;
    --g-bonds: #0C6E60;
    --g-founders: #7A3488;
    --g-live: #8E520E;
  }
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { scrollbar-gutter: stable; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
:focus-visible { outline: 2px solid var(--agent); outline-offset: 3px; border-radius: 4px; }
.mono { font-family: var(--mono); }
.tnum { font-variant-numeric: tabular-nums; }

/* ── Layout ───────────────────────────────────────────────── */
.z-wrap { max-width: var(--wrap); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
/* keep the column on whole pixels, so the logo and hairlines stay sharp */
@supports (margin-left: round(down, 1.5px, 1px)) {
  .z-wrap { margin-left: max(0px, round(down, (100% - var(--wrap)) / 2, 1px)); margin-right: 0; }
}
.z-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--col-gap); }

/* ── Type ─────────────────────────────────────────────────── */
.z-eyebrow { font-size: 14px; color: var(--mute); }
.z-h1 { font-size: clamp(44px, 6vw, 80px); line-height: 1; font-weight: 600; letter-spacing: -0.04em; }
.z-h2 { font-size: clamp(28px, 3vw, 40px); line-height: 1.1; font-weight: 600; letter-spacing: -0.025em; }
.z-h3 { font-size: 20px; line-height: 1.3; font-weight: 600; letter-spacing: -0.01em; }
.z-lead { font-size: 20px; line-height: 1.55; color: var(--soft); max-width: 36em; }
.z-body { color: var(--soft); max-width: 40em; }
.z-small { font-size: 14px; color: var(--mute); }

/* ── Header ───────────────────────────────────────────────── */
.z-header {
  position: sticky; top: 0; z-index: 40;
  background: var(--header);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.z-header-inner { display: flex; align-items: center; gap: 32px; height: 68px; }
.z-brand { display: inline-flex; align-items: center; gap: 10px; height: 28px; line-height: 28px; text-decoration: none; font-weight: 700; font-size: 18px; letter-spacing: -0.01em; }
.z-brand-mark { display: block; flex: none; width: 28px; height: 28px; color: var(--ink); }
.z-brand-sub { color: var(--mute); font-weight: 500; }
.z-nav { display: flex; gap: 6px; margin-left: auto; }
.z-nav a { text-decoration: none; color: var(--soft); font-size: 15px; font-weight: 500; padding: 8px 12px; border-radius: 8px; white-space: nowrap; }
.z-nav a:hover { color: var(--ink); background: var(--raise); }
.z-nav a[aria-current="page"] { color: var(--ink); background: var(--raise-2); }
.z-header-actions { display: flex; align-items: center; gap: 10px; }
.z-menu { display: none; width: 40px; height: 40px; border-radius: 8px; background: transparent; color: var(--soft); border: 1px solid var(--line-2); cursor: pointer; font-size: 17px; }
.z-theme { width: 40px; height: 40px; border-radius: 8px; background: transparent; color: var(--ink); border: 1px solid var(--line-2); cursor: pointer; display: inline-flex; align-items: center; justify-content: center; flex: none; }
.z-theme:hover { border-color: var(--soft); }
.z-theme svg { width: 18px; height: 18px; display: block; }
.z-theme-moon { display: none; }
html[data-theme="light"] .z-theme-sun { display: none; }
html[data-theme="light"] .z-theme-moon { display: block; }
@media (prefers-color-scheme: light) {
  html:not([data-theme]) .z-theme-sun { display: none; }
  html:not([data-theme]) .z-theme-moon { display: block; }
}

/* ── Buttons ──────────────────────────────────────────────── */
.z-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 22px; border-radius: 10px; font: inherit; font-size: 15px; font-weight: 600; text-decoration: none; border: 1px solid transparent; cursor: pointer; white-space: nowrap; transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease; }
.z-btn-sm { min-height: 40px; padding: 0 16px; font-size: 14px; }
.z-btn-primary { background: var(--ink); color: var(--bg); }
.z-btn-primary:hover { background: var(--btn-primary-hover); }
.z-btn-agent { background: #5EE8A0; color: #06140D; }
.z-btn-agent:hover { background: #7FF0B6; }
.z-btn-steward { background: #FFD556; color: #1A1404; }
.z-btn-steward:hover { background: #FFE17F; }
.z-btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.z-btn-ghost:hover { border-color: var(--soft); }
.z-btn[disabled] { opacity: 0.5; cursor: not-allowed; }
.z-link { font-weight: 600; text-decoration: underline; text-underline-offset: 5px; text-decoration-color: var(--line-2); }
.z-link:hover { text-decoration-color: currentColor; }

/* ── Tags ─────────────────────────────────────────────────── */
.z-tag { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line-2); color: var(--soft); }
.z-tag::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.z-tag-agent { color: var(--agent); border-color: rgba(94, 232, 160, 0.35); }
.z-tag-steward { color: var(--steward); border-color: rgba(255, 213, 86, 0.35); }

/* ── Hero ─────────────────────────────────────────────────── */
.z-hero { padding-top: 88px; padding-bottom: 96px; align-items: stretch; row-gap: 48px; }
.z-hero-text { grid-column: 1 / span 7; }
.z-hero-visual { grid-column: 8 / span 5; height: 100%; min-height: 0; }
.z-hero .z-eyebrow { margin-bottom: 22px; }
.z-hero .z-lead { margin-top: 26px; }
.z-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 34px; }
.z-live { margin-top: 26px; font-size: 14px; color: var(--mute); }
.z-live b { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
.z-pulse { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--agent); margin-right: 8px; vertical-align: 1px; }

/* ── Sections ─────────────────────────────────────────────── */
.z-sec { border-top: 1px solid var(--line); }
.z-sec > .z-wrap { padding-top: 96px; padding-bottom: 96px; }
.z-sec-head { grid-column: 1 / span 4; padding-right: 24px; }
.z-sec-head .z-eyebrow { margin-bottom: 14px; }
.z-sec-head .z-body { margin-top: 14px; font-size: 16px; }
.z-sec-body { grid-column: 5 / span 8; }
.z-sec-full { grid-column: 1 / -1; }
.z-sec-full > .z-h2 + .z-body { margin-top: 12px; }

/* ── Cards ────────────────────────────────────────────────── */
.z-card { background: var(--raise); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.z-card-agent { border-top: 2px solid var(--agent); }
.z-card-steward { border-top: 2px solid var(--steward); }
.z-cards { display: grid; gap: 16px; }
.z-cards-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.z-cards-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.z-cards-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.z-glyph { font-size: 26px; line-height: 1; color: var(--ink); }
.z-card .z-glyph + .z-h3 { margin-top: 20px; }
.z-card .z-h3 + p { margin-top: 8px; font-size: 15.5px; color: var(--soft); }
a.z-card { display: block; text-decoration: none; transition: border-color 150ms ease, background-color 150ms ease; }
a.z-card:hover { border-color: var(--line-2); background: var(--raise-2); }
.z-card-more { display: inline-block; margin-top: 18px; font-size: 14px; font-weight: 600; color: var(--ink); }

/* Two flows */
.z-flows { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.z-flow { display: flex; flex-direction: column; gap: 18px; padding: 36px; }
.z-flow .z-h2 { font-size: clamp(26px, 2.6vw, 34px); }
.z-flow .z-tag, .z-card > .z-tag { align-self: flex-start; }
.z-flow p { color: var(--soft); }
.z-flow .z-actions { margin-top: auto; padding-top: 8px; }

/* Call steps: what to call, and on which contract */
.z-chain { font-family: var(--mono); font-size: 12.5px; color: var(--mute); }
.z-calls { list-style: none; counter-reset: call; }
.z-calls > li { position: relative; padding: 16px 0 16px 40px; border-top: 1px solid var(--line); }
.z-calls > li:last-child { border-bottom: 1px solid var(--line); }
.z-calls > li::before { counter-increment: call; content: counter(call); position: absolute; left: 0; top: 15px; width: 24px; height: 24px; border-radius: 50%; border: 1px solid var(--line-2); font: 500 12px/22px var(--mono); text-align: center; color: var(--mute); }
.z-card-agent .z-calls > li::before { color: var(--agent); border-color: rgba(94, 232, 160, 0.35); }
.z-card-steward .z-calls > li::before { color: var(--steward); border-color: rgba(255, 213, 86, 0.35); }
.z-call-t { font-weight: 600; font-size: 15.5px; color: var(--ink); }
.z-call-d { margin-top: 4px; font-size: 14.5px; color: var(--soft); }
.z-call-fn { margin-top: 10px; font-family: var(--mono); font-size: 13px; color: var(--ink); overflow-wrap: anywhere; }
.z-call-fn .sel { display: inline-block; white-space: nowrap; margin-left: 10px; color: var(--agent); }
.z-call-at { margin-top: 6px; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; font-family: var(--mono); font-size: 12.5px; color: var(--mute); }
.z-call-at a { color: var(--soft); border-bottom: 1px dotted var(--line-2); overflow-wrap: anywhere; min-width: 0; }
.z-call-at a:hover { color: var(--ink); }
.z-copy { font: 500 11.5px/1.4 var(--sans); color: var(--mute); background: none; border: 1px solid var(--line-2); border-radius: 6px; padding: 2px 8px; cursor: pointer; }
.z-copy:hover { color: var(--ink); border-color: var(--mute); }
.z-copy.done { color: var(--agent); border-color: rgba(94, 232, 160, 0.35); }

/* Code */
.z-code { font-family: var(--mono); font-size: 13.5px; line-height: 1.85; color: var(--code-ink); background: var(--code-bg); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; overflow-x: auto; white-space: pre; }
.z-code .k { color: var(--mute); }
.z-code .s { color: var(--agent); }

/* Rows (lists with hairlines) */
.z-rows { list-style: none; }
.z-rows li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; padding: 16px 0; border-top: 1px solid var(--line); }
.z-rows li:last-child { border-bottom: 1px solid var(--line); }
.z-rows .note { grid-column: 1 / -1; font-size: 14.5px; color: var(--mute); }

/* Quote */
.z-quote { font-size: clamp(22px, 2.3vw, 28px); line-height: 1.4; font-weight: 500; letter-spacing: -0.012em; }
.z-quote-cap { margin-top: 16px; font-size: 14px; color: var(--mute); }
.z-quote-cap b { color: var(--ink); font-weight: 600; }
.z-glyphline { font-size: 22px; letter-spacing: 0.16em; color: var(--ink); }

/* Letter (the note to the agent) */
.z-letter { font-size: clamp(22px, 2.2vw, 28px); line-height: 1.45; letter-spacing: -0.01em; max-width: 30em; }
.z-letter p + p { margin-top: 0.85em; }
.z-letter .soft { color: var(--soft); }

/* Steps */
.z-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; counter-reset: step; }
.z-step { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--raise); }
.z-step-n { font-family: var(--mono); font-size: 13px; color: var(--mute); }
.z-step .z-h3 { margin-top: 14px; }
.z-step p { margin-top: 8px; font-size: 15.5px; color: var(--soft); }

/* Intent legend */
.z-intents { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 24px; }
.z-intent { padding: 18px 0; border-top: 1px solid var(--line); }
.z-intent b { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; }
.z-intent b::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--c, var(--soft)); }
.z-intent span { display: block; margin-top: 4px; font-size: 14.5px; color: var(--mute); }

/* Figures (numbers that mean something) */
.z-figs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 24px; }
.z-fig { padding: 22px 0; border-top: 1px solid var(--line); }
.z-fig-v { font-size: 30px; font-weight: 600; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.z-fig-k { margin-top: 4px; font-size: 14.5px; color: var(--mute); }

/* ── Footer ───────────────────────────────────────────────── */
.z-footer { border-top: 1px solid var(--line); background: var(--footer); }
.z-footer > .z-wrap { padding-top: 64px; padding-bottom: 40px; }
.z-foot-brand { grid-column: 1 / span 4; }
.z-foot-brand p { margin-top: 14px; font-size: 15px; color: var(--mute); max-width: 22em; }
.z-foot-col { grid-column: span 2; }
.z-foot-col h4 { font-size: 13px; font-weight: 600; color: var(--soft); margin-bottom: 14px; }
.z-foot-col a { display: block; font-size: 14.5px; color: var(--mute); text-decoration: none; padding: 4px 0; }
.z-foot-col a:hover { color: var(--ink); }
.z-foot-contracts { grid-column: 1 / -1; margin-top: 48px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 6px 22px; font-family: var(--mono); font-size: 12px; color: var(--mute); }
.z-foot-contracts a { color: var(--soft); text-decoration: none; }
.z-foot-contracts a:hover { color: var(--ink); text-decoration: underline; }

/* ── Loading ──────────────────────────────────────────────── */
@keyframes z-fade { 50% { opacity: 0.45; } }
.z-loading { animation: z-fade 1.6s ease-in-out infinite; }

/* ── Responsive ───────────────────────────────────────────── */
/* Desktop: a card beside the hero text stretches to that text. The Learn the Field
   doors share the text block's height so their last edge meets the copy. */
@media (min-width: 1101px) {
  .z-grid.z-hero > .field-doors {
    height: 0;
    min-height: 100%;
    display: flex;
    flex-direction: column;
  }
  .z-grid.z-hero > .field-doors > .field-door {
    flex: 1 1 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}
@media (max-width: 1100px) {
  .z-hero-text, .z-hero-visual { grid-column: 1 / -1; }
  .z-sec-head { grid-column: 1 / -1; padding-right: 0; margin-bottom: 36px; }
  .z-sec-body { grid-column: 1 / -1; }
  .z-cards-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .z-foot-brand { grid-column: 1 / -1; margin-bottom: 36px; }
  .z-foot-col { grid-column: span 4; }
}
@media (max-width: 860px) {
  .z-menu { display: inline-flex; align-items: center; justify-content: center; }
  .z-header-inner { gap: 12px; position: relative; }
  .z-nav { display: none; position: absolute; top: 68px; left: calc(-1 * var(--gutter)); right: calc(-1 * var(--gutter)); flex-direction: column; gap: 2px; padding: 12px var(--gutter) 18px; background: var(--bg); border-bottom: 1px solid var(--line); }
  .z-nav.open { display: flex; }
  .z-nav a { font-size: 17px; padding: 12px 10px; }
  .z-header-actions { margin-left: auto; }
}
@media (max-width: 760px) {
  :root { --gutter: 18px; --col-gap: 14px; }
  body { font-size: 16px; }
  .z-hero { padding-top: 56px; padding-bottom: 64px; }
  .z-sec > .z-wrap { padding-top: 64px; padding-bottom: 64px; }
  .z-flows, .z-cards-2, .z-cards-3, .z-cards-4, .z-steps, .z-figs, .z-intents { grid-template-columns: minmax(0, 1fr); }
  .z-flow { padding: 26px 22px; }
  .z-card { padding: 22px; }
  .z-foot-col { grid-column: span 6; margin-bottom: 24px; }
  .z-header-cta { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* Guides: link cards and the Learn the Field sub-navigation */
.z-guide-card { border-top: 2px solid var(--g); }
.z-guide-card .z-glyph { color: var(--g); }
a.z-guide-card:hover { border-color: var(--line-2); border-top-color: var(--g); background: color-mix(in srgb, var(--g) 5%, var(--raise)); }
.z-subnav { border-bottom: 1px solid var(--line); }
.z-subnav-inner { display: flex; align-items: center; gap: 4px; overflow-x: auto; scrollbar-width: none; height: 56px; }
/* the sub-nav takes its height out of the hero's top space, so every page's heading starts at the same line */
.z-subnav + .z-hero { padding-top: 31px; }
@media (max-width: 760px) { .z-subnav + .z-hero { padding-top: 28px; } }
.z-subnav-inner::-webkit-scrollbar { display: none; }
.z-subnav-label { margin-right: 12px; font-size: 13px; color: var(--mute); white-space: nowrap; text-decoration: none; }
.z-subnav a.z-subnav-label { padding: 6px 0; border: 0; color: var(--mute); }
.z-subnav a.z-subnav-label::before { content: none; }
.z-subnav a.z-subnav-label:hover { color: var(--ink); }
.z-subnav a.z-subnav-label::after { content: "/"; margin-left: 12px; color: var(--line-2); }
.z-subnav a { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border: 1px solid transparent; border-radius: 999px; font-size: 14px; color: var(--soft); text-decoration: none; white-space: nowrap; }
.z-subnav a::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--g, var(--mute)); }
.z-subnav a:hover { color: var(--ink); }
.z-subnav a[aria-current="page"] { color: var(--ink); background: color-mix(in srgb, var(--g, #EDF1F5) 9%, transparent); border-color: color-mix(in srgb, var(--g, #EDF1F5) 32%, transparent); }
.z-guide .z-hero .z-eyebrow { color: var(--g, var(--mute)); }
@media (max-width: 760px) { .z-subnav a.z-subnav-label { display: none; } }

/* An intro line beside a section heading ends on the heading's last line */
.z-grid:has(> .z-sec-body > .z-body:only-child) > .z-sec-head,
.z-grid > .z-sec-body:has(> .z-body:only-child) { align-self: last baseline; }