@layer reset, base, tokens, layout, components, utilities;

@font-face { font-family: "Instrument Sans"; src: url("assets/fonts/instrument-sans-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Instrument Sans"; src: url("assets/fonts/instrument-sans-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Sora"; src: url("assets/fonts/sora-latin-600-normal.woff2") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Sora"; src: url("assets/fonts/sora-latin-700-normal.woff2") format("woff2"); font-weight: 700; font-display: swap; }

@layer tokens {
  /* DHCraft house palette (dhcraft-site global.css) in OKLCH, as on the Second Brain Vault page.
     Paper is the reading ground, the night is navy ink where the example plays. */
  :root {
    color-scheme: light;
    --ground: oklch(99.1% 0.005 95);
    --ground-alt: oklch(96.6% 0.01 95);
    --surface: oklch(100% 0 0);
    --edge-hi: oklch(28.3% 0.064 271 / 0.25);
    --ink: oklch(28.3% 0.064 271);
    --ink-soft: oklch(42% 0.05 271);
    --ink-faint: oklch(52% 0.04 271);
    --accent: oklch(53.1% 0.14 315);
    --on-accent: oklch(99% 0.005 95);
    --sheen: oklch(100% 0 0 / 0.6);
    --st-new: oklch(63.5% 0.136 139);
    --st-flag: oklch(58% 0.13 30);
    --focus: oklch(53.1% 0.14 315);
    --head-bg: oklch(15% 0.042 271);
    --glow: oklch(74% 0.13 315 / 0.35);
    --glass-1: oklch(45% 0.13 315 / 0.32);
    --glass-2: oklch(40% 0.09 255 / 0.22);

    --font: "Instrument Sans", system-ui, sans-serif;
    --display: "Sora", "Instrument Sans", system-ui, sans-serif;
    --mono: ui-monospace, "Cascadia Code", Consolas, monospace;
    --step--1: clamp(0.84rem, 0.82rem + 0.1vw, 0.9rem);
    --step-0: clamp(1rem, 0.97rem + 0.15vw, 1.08rem);
    --step-1: clamp(1.15rem, 1.08rem + 0.35vw, 1.35rem);
    --step-2: clamp(1.45rem, 1.25rem + 0.9vw, 1.95rem);
    --step-3: clamp(2.2rem, 1.6rem + 2.6vw, 3.5rem);
    --space: clamp(1rem, 0.8rem + 1vw, 1.6rem);
    --gutter: clamp(1rem, 0.6rem + 2vw, 2.5rem);
    --measure: 42rem;
    --wide: 80rem;
    --head-h: 3.6rem;
  }

  .night {
    color-scheme: dark;
    --ground: oklch(17% 0.045 271);
    --ground-alt: oklch(14% 0.04 271);
    --surface: oklch(22% 0.05 271);
    --edge-hi: oklch(100% 0 0 / 0.22);
    --ink: oklch(95% 0.01 95);
    --ink-soft: oklch(82% 0.03 271);
    --ink-faint: oklch(70% 0.03 271);
    --accent: oklch(74% 0.13 315);
    --on-accent: oklch(17% 0.045 271);
    --sheen: oklch(100% 0 0 / 0.06);
    --st-new: oklch(78% 0.14 139);
    --st-flag: oklch(74% 0.14 35);
    --focus: oklch(84% 0.09 315);
  }
}

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body, h1, h2, h3, p, ol, ul, figure, pre { margin: 0; }
  ol, ul { padding: 0; list-style: none; }
  img, svg { display: block; max-inline-size: 100%; }
  button { font: inherit; color: inherit; }
}

@layer base {
  html { scroll-padding-block-start: calc(var(--head-h) + 1rem); }
  /* The header wraps to two rows on a phone. */
  @media (max-width: 47.99rem) { html { scroll-padding-block-start: calc(var(--head-h) + 3.5rem); } }
  @media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
  body { background: var(--ground); color: var(--ink); font-family: var(--font); font-size: var(--step-0); line-height: 1.6; -webkit-font-smoothing: antialiased; }
  .night { background-color: var(--ground); color: var(--ink); }
  /* Three text levels: headings, body, and meta at --step--1. h3 is body size in bold;
     only h1, h2 and the lead paragraph are larger. */
  h1, h2, h3 { font-family: var(--display); font-weight: 700; letter-spacing: -0.01em; }
  h1 { font-size: var(--step-3); line-height: 1.05; letter-spacing: -0.02em; }
  h2 { font-size: var(--step-2); line-height: 1.2; }
  h3 { font-size: var(--step-0); line-height: 1.35; font-weight: 600; }
  a { color: var(--accent); text-underline-offset: 0.18em; }
  code, pre { font-family: var(--mono); font-size: 0.88em; }
  :focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; }
}

@layer layout {
  .skip { position: absolute; inset-inline-start: 1rem; inset-block-start: -3rem; background: var(--surface); padding: 0.5rem 1rem; z-index: 40; }
  .skip:focus { inset-block-start: 0.5rem; }

  /* Header: opaque, always night, wrapping instead of scrolling on narrow screens. */
  .site-head {
    position: sticky; inset-block-start: 0; z-index: 20;
    display: flex; align-items: center; gap: 0.4rem 2rem; flex-wrap: wrap;
    min-block-size: var(--head-h); padding: 0.35rem var(--gutter);
    background: var(--head-bg);
  }
  .brand { display: flex; align-items: center; gap: 0.6rem; font-family: var(--display); font-weight: 700; color: var(--ink); text-decoration: none; }
  .brand img { inline-size: 1.75rem; block-size: 1.75rem; }
  .site-nav { flex: 1; min-inline-size: 0; }
  .site-nav ul { display: flex; flex-wrap: wrap; gap: 0 0.2rem; }
  .site-nav a { display: block; padding: 0.55rem 0.7rem; color: var(--ink-soft); text-decoration: none; white-space: nowrap; border-block-end: 2px solid transparent; }
  .site-nav a:hover { color: var(--ink); }
  .site-nav a[aria-current="true"] { color: var(--ink); border-block-end-color: var(--accent); }
  .head-actions { display: flex; gap: 0.5rem; align-items: center; }
  @media (max-width: 47.99rem) {
    .site-nav { flex-basis: 100%; order: 3; }
    .site-head { gap: 0 1rem; justify-content: space-between; }
  }

  .band { padding: calc(var(--space) * 3) var(--gutter); }
  .band.alt { background: var(--ground-alt); }
  .inner { max-inline-size: var(--wide); margin-inline: auto; display: grid; gap: calc(var(--space) * 1.1); }

  /* Hero: text left, example right, stacked on narrow screens. */
  .hero { display: grid; gap: calc(var(--space) * 1.5); align-items: center; max-inline-size: var(--wide); margin-inline: auto; padding: 0.9rem var(--gutter) calc(var(--space) * 1.5); grid-template-columns: minmax(0, 1fr); }
  @media (min-width: 62rem) { .hero { grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr); min-block-size: calc(100svh - var(--head-h)); } }
  .hero-text { display: grid; gap: 1.2rem; align-content: center; }
  .night-glass {
    background:
      radial-gradient(55rem 38rem at 80% -10%, var(--glass-1), transparent 70%),
      radial-gradient(40rem 30rem at -10% 50%, var(--glass-2), transparent 70%),
      var(--ground);
  }

  /* Try it: the steps on the left, the folder they fill on the right. */
  .grow { max-inline-size: var(--wide); margin-inline: auto; display: grid; gap: calc(var(--space) * 2); grid-template-columns: minmax(0, 1fr); }
  #try-body { display: grid; gap: calc(var(--space) * 1.1); align-content: start; }
  .grow-folder { display: none; }
  @media (min-width: 62rem) {
    .grow { grid-template-columns: minmax(0, var(--measure)) minmax(0, 24rem); justify-content: space-between; }
    .grow-folder { display: grid; position: sticky; inset-block-start: calc(var(--head-h) + 1.5rem); align-self: start; }
  }

  .site-foot { padding: calc(var(--space) * 2) var(--gutter); font-size: var(--step--1); }
  .foot-grid { max-inline-size: var(--wide); margin-inline: auto; display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr)); }
  .foot-grid > div { display: grid; gap: 0.6rem; }
  .foot-links { display: grid; gap: 0.35rem; align-content: start; }
}

@layer components {
  /* Controls: pills. */
  .btn, .pill {
    display: inline-flex; align-items: center; border-radius: 999px; border: 1px solid var(--edge-hi);
    background: transparent; color: var(--ink); text-decoration: none; cursor: pointer; white-space: nowrap;
  }
  .btn:hover, .pill:hover { border-color: var(--accent); }
  .btn { gap: 0.4rem; padding: 0.55rem 1.1rem; font-weight: 600; min-block-size: 2.5rem; }
  .btn.primary { background: var(--accent); color: var(--on-accent); border-color: transparent; }
  .night .btn.primary { box-shadow: 0 0 2rem var(--glow); }
  .btn.small { min-block-size: 2.2rem; padding: 0.2rem 0.9rem; font-size: var(--step--1); }
  .btn:disabled { opacity: 0.55; cursor: default; }
  .pill { padding: 0.3rem 0.85rem; font-size: var(--step--1); min-block-size: 2.2rem; }
  .actions { display: flex; flex-wrap: wrap; gap: 0.7rem; }

  .lead { font-size: var(--step-1); line-height: 1.5; color: var(--ink-soft); max-inline-size: 34rem; }
  .who { color: var(--ink-faint); max-inline-size: 34rem; }
  .intro { color: var(--ink-soft); max-inline-size: var(--measure); }
  .quiet { color: var(--ink-faint); }

  /* The four parts of the practice as one line. */
  .flow { display: flex; flex-wrap: wrap; gap: 0.3rem 0.4rem; align-items: baseline; color: var(--ink-soft); }
  .flow li { white-space: nowrap; }
  .flow li:not(:last-child)::after { content: "\2192"; margin-inline-start: 0.5rem; color: var(--accent); }
  .flow strong { color: var(--ink); }

  /* Example: named steps above, the project folder and the prototype side by side below. */
  .example { display: grid; gap: 0.8rem; align-content: center; }
  .episode-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem 1rem; }
  .episode-title { font-family: var(--display); font-weight: 600; }
  #episode-stepper { display: grid; gap: 0.6rem; }
  .step-list { display: flex; flex-wrap: wrap; gap: 0.3rem; }
  .step-pick {
    display: inline-flex; align-items: center; gap: 0.35rem; min-block-size: 2.2rem; padding: 0.15rem 0.7rem 0.15rem 0.25rem;
    border-radius: 999px; border: 1px solid var(--edge-hi); background: transparent; cursor: pointer; font-size: var(--step--1); color: var(--ink-faint);
  }
  .step-pick:hover { border-color: var(--accent); }
  .step-mark { display: inline-grid; place-items: center; inline-size: 1.5rem; block-size: 1.5rem; border-radius: 50%; font-size: var(--step--1); font-weight: 600; border: 1px dashed var(--edge-hi); }
  .step-pick[data-state="done"] { color: var(--ink-soft); }
  .step-pick[data-state="done"] .step-mark { border: 1px solid var(--accent); color: var(--accent); }
  .step-pick[data-state="current"] { background: var(--accent); color: var(--on-accent); border-color: transparent; }
  .step-pick[data-state="current"] .step-mark { border: 0; background: var(--on-accent); color: var(--accent); }
  .step-caption { color: var(--ink-soft); max-inline-size: var(--measure); }
  .step-caption strong { color: var(--ink); }
  .step-caption.probe { position: absolute; visibility: hidden; pointer-events: none; }
  .step-example { display: block; margin-block-start: 0.5rem; padding: 0.45rem 0.75rem; background: var(--sheen); color: var(--ink); border-radius: 0.3rem; }
  .step-controls { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
  .step-count { color: var(--ink-faint); font-size: var(--step--1); }

  .panes { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); }
  .pane { background: var(--surface); border-radius: 0.8rem; padding: 0.9rem 1rem 1rem; display: grid; gap: 0.6rem; align-content: start; }
  .pane-title { font-size: var(--step-0); display: flex; justify-content: space-between; gap: 1rem; }
  .version { font-family: var(--font); font-weight: 400; font-size: var(--step--1); color: var(--ink-faint); }

  /* Each file state carries a word; a fill repeats new and changed for a quick glance. A fixed
     state column keeps the glosses from rewrapping as the state words change. */
  .files { display: grid; font-size: var(--step--1); line-height: 1.25; }
  .file { display: grid; grid-template-columns: minmax(0, 1fr) 4.9rem; column-gap: 0.6rem; padding-block: 0.15rem; }
  .file code { font-size: 1em; color: var(--ink); overflow-wrap: anywhere; }
  .file .dir { color: var(--ink-faint); }
  .file .gloss { grid-column: 1; color: var(--ink-faint); }
  .file .state { grid-column: 2; grid-row: 1 / span 2; align-self: center; justify-self: end; padding: 0.05rem 0.55rem; border-radius: 999px; white-space: nowrap; }
  .file.is-absent code, .file.is-absent .dir, .file.is-absent .state { color: var(--ink-faint); }
  .file.is-new .state { background: var(--st-new); color: var(--on-accent); font-weight: 600; }
  .file.is-changed .state { background: var(--ink); color: var(--ground); font-weight: 600; }
  .file.is-read .state { color: var(--ink-soft); font-style: italic; }

  /* Prototype timeline: shape carries the distinction, orange marks only the reader's check. */
  .proto-empty { color: var(--ink-faint); font-size: var(--step--1); align-self: center; }
  .proto-view svg { inline-size: 100%; block-size: auto; }
  .proto-view .axis { stroke: var(--ink-faint); stroke-width: 0.8; }
  .proto-view .tick { stroke: var(--ink-faint); stroke-width: 0.6; }
  .proto-view .year { fill: var(--ink-soft); font-size: 8px; font-family: var(--font); }
  .proto-view .mark.exact, .proto-view .mark.span { fill: var(--ink-soft); }
  .proto-view .mark.flagged { fill: var(--st-flag); }
  .proto-view .flag-ring { fill: none; stroke: var(--st-flag); stroke-width: 1.4; stroke-dasharray: 2 1.4; }
  .proto-legend { display: grid; gap: 0.25rem; font-size: var(--step--1); color: var(--ink-soft); }
  .proto-legend li { display: flex; gap: 0.5rem; align-items: baseline; }
  .key { flex: none; display: inline-block; inline-size: 0.6rem; block-size: 0.6rem; border-radius: 50%; translate: 0 0.05rem; }
  .key.exact { background: var(--ink-soft); }
  .key.flagged { background: var(--st-flag); outline: 1px dashed var(--st-flag); outline-offset: 2px; }
  .key.span { background: var(--ink-soft); inline-size: 1.2rem; border-radius: 999px; }
  .proto-note { font-size: var(--step--1); color: var(--ink-faint); }

  /* On a phone the short prototype comes first, and absent rows and the glosses of untouched
     files give way, so the files a step changes stay near its caption. */
  @media (max-width: 47.99rem) {
    #proto { order: -1; }
    #folder .file.is-absent { display: none; }
    #folder .file.is-same .gloss { display: none; }
    #folder .file.is-same code, #folder .file.is-same .dir { color: var(--ink-faint); }
    .step-count { flex-basis: 100%; }
  }

  /* Try it: one track per step. */
  .tools { display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; font-size: var(--step--1); color: var(--ink-soft); max-inline-size: var(--measure); }
  .tools-label { font-weight: 600; color: var(--ink); }
  .tool a { font-weight: 600; }
  .steps { display: grid; counter-reset: step; max-inline-size: var(--measure); }
  .steps > li { counter-increment: step; display: grid; gap: 0.5rem; padding-block: 1.2rem 1.6rem; }
  .steps h3::before { content: counter(step) "  "; color: var(--accent); font-variant-numeric: tabular-nums; }
  .steps p { color: var(--ink-soft); }
  .steps .result { color: var(--ink); }
  .steps .result::before { content: "→ " / ""; color: var(--accent); }
  .step-links { display: flex; flex-wrap: wrap; gap: 0.3rem 1.2rem; font-size: var(--step--1); }
  .prompt-box { display: grid; gap: 0.35rem; justify-items: start; }
  .prompt { inline-size: 100%; background: var(--surface); padding: 0.7rem 0.9rem; border-radius: 0.6rem; white-space: pre-wrap; overflow-wrap: anywhere; font-size: var(--step--1); }
  .prompt code { font-size: 1em; }

  /* Set up: a schematic assistant window. Its parts are drawn as fills, and the numbered marks
     match the key below it. */
  .win-figure { display: grid; gap: 0.6rem; margin: 0.4rem 0 0.2rem; }
  .win-figure .quiet { font-size: var(--step--1); }
  .win { background: var(--surface); border-radius: 0.8rem; overflow: hidden; font-size: var(--step--1); color: var(--ink-soft); }
  .win-bar { display: flex; align-items: center; gap: 0.6rem; padding: 0.55rem 0.9rem; background: var(--ink); color: var(--ground); }
  .win-folder { display: inline-flex; align-items: center; gap: 0.45rem; padding: 0.1rem 0.7rem; border-radius: 999px; background: var(--ground); color: var(--ink); font-family: var(--mono); }
  .win-folder-icon { inline-size: 0.9rem; block-size: 0.65rem; border-radius: 0.12rem; background: var(--ink-faint); }
  .win-chat { display: grid; gap: 0.6rem; padding: 0.9rem; }
  .win-you { justify-self: end; max-inline-size: 85%; padding: 0.45rem 0.75rem; border-radius: 0.8rem; background: var(--ground-alt); color: var(--ink); }
  .win-reply { max-inline-size: 90%; }
  .win-ask { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.7rem; padding: 0.5rem 0.75rem; border-radius: 0.6rem; background: var(--ground-alt); color: var(--ink); }
  .win-buttons { display: inline-flex; gap: 0.4rem; margin-inline-start: auto; }
  .win-btn { padding: 0.05rem 0.7rem; border-radius: 999px; background: var(--surface); }
  .win-btn.yes { background: var(--accent); color: var(--on-accent); }
  .win-input { display: flex; align-items: center; gap: 0.6rem; margin: 0 0.9rem 0.9rem; padding: 0.5rem 0.75rem; border-radius: 999px; background: var(--ground-alt); color: var(--ink-faint); }
  .win-keys { display: grid; gap: 0.3rem; counter-reset: key; font-size: var(--step--1); color: var(--ink-soft); }
  .win-keys li { counter-increment: key; display: grid; grid-template-columns: 1.4rem minmax(0, 1fr); gap: 0.6rem; }
  .win-mark, .win-keys li::before { flex: none; display: inline-grid; place-items: center; inline-size: 1.4rem; block-size: 1.4rem; border-radius: 50%; background: var(--accent); color: var(--on-accent); font-weight: 600; }
  .win-keys li::before { content: counter(key); }

  /* Good to know: calm columns of sentences. */
  .columns { display: grid; gap: var(--space) calc(var(--space) * 2); grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); }
  .columns h3 { margin-block-end: 0.6rem; }
  .plain { display: grid; gap: 0.7rem; color: var(--ink-soft); }
  .plain a { font-size: var(--step--1); }
  .plain.links a { font-size: inherit; }
}

@layer utilities {
  /* In utilities, so it wins over the pill display of the components layer. The footer
     carries the same link. */
  @media (max-width: 47.99rem) { .spec-link { display: none; } }
  .visually-hidden { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
}