/* Raphiel — warm paper + ink. Full saturation appears only in the itten
   state colours; everything else is muted paper, ink and rule. */

:root {
  color-scheme: light;
  /* paper + ink */
  --paper:        #f6f1e6;
  --paper-raised: #fdfbf5;
  --paper-sunk:   #efe8d9;
  --ink:          #211d18;
  --ink-muted:    #6b6456;
  --ink-faint:    #9a9284;
  --rule:         #e2dac9;
  --rule-strong:  #cfc5b0;

  /* the one non-itten accent is ink itself — CTAs are ink on paper */
  --cta-bg:       var(--ink);
  --cta-fg:       #fbf7ee;

  /* itten form-colours — the only saturation on the page.
     each state pairs a hue with a geometric form (see js/svg). */
  --itten-red:    #c8402f;   /* square    */
  --itten-orange: #d07b2c;   /* trapezoid */
  --itten-yellow: #c99a06;   /* triangle  */
  --itten-green:  #4e8b3c;   /* hexagon   */
  --itten-blue:   #2f6fab;   /* circle    */
  --itten-violet: #6d4b9f;   /* ellipse   */
  --itten-black:  #211d18;   /* chevron   */

  /* confidence surfacing — exception colours only */
  --conf-review:   #d8a200;  /* amber: model self-doubt            */
  --conf-review-fill: #f6e6ab;
  --conf-conflict: #c0392b;  /* red: reconciliation check failed   */
  --conf-conflict-fill: #f2cfc9;
  --conf-ok:       #4e8b3c;  /* corroborated                       */

  /* type — bundled typewriter (Special Elite display, Courier Prime body/chrome).
     IBM Plex Sans Thai leads each stack but is unicode-range-gated to the Thai block,
     so Latin falls straight through to the typewriter faces; Thai glyphs use Plex Thai. */
  --font-display: "IBM Plex Sans Thai", "Special Elite", "Courier Prime", ui-monospace, monospace;
  --font-body:    "IBM Plex Sans Thai", "Courier Prime", ui-monospace, monospace;
  --font-mono:    "IBM Plex Sans Thai", "Courier Prime", ui-monospace, monospace;

  /* scale */
  --step--1: clamp(0.83rem, 0.8rem + 0.15vw, 0.9rem);
  --step-0:  clamp(1rem, 0.96rem + 0.2vw, 1.1rem);
  --step-1:  clamp(1.2rem, 1.1rem + 0.5vw, 1.4rem);
  --step-2:  clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --step-3:  clamp(2rem, 1.6rem + 2vw, 3rem);
  --step-4:  clamp(2.6rem, 2rem + 3vw, 4.4rem);

  /* space + layout */
  --gutter: 16px;
  --measure: 66ch;
  --container: 1120px;
  --radius: 10px;
  --section-y: clamp(4rem, 3rem + 6vw, 7rem);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:        #17140f;
    --paper-raised: #211d16;
    --paper-sunk:   #100d09;
    --ink:          #f1ece0;
    --ink-muted:    #b4ac99;
    --ink-faint:    #776f5f;
    --rule:         #332d22;
    --rule-strong:  #473f30;
    --cta-bg:       #f1ece0;
    --cta-fg:       #17140f;
    /* itten hues lifted for contrast on dark paper */
    --itten-red:    #e8614f;
    --itten-orange: #e8964a;
    --itten-yellow: #e7bb33;
    --itten-green:  #6fb257;
    --itten-blue:   #589fdd;
    --itten-violet: #a07fd0;
    --itten-black:  #cfc5b0;
    --conf-review-fill:   #4a3f17;
    --conf-conflict-fill: #4a2520;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  font-feature-settings: "ss01", "cv05";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.12;
  letter-spacing: -0.005em;
  text-wrap: balance;
  margin: 0 0 0.6em;
}
h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); }

p { margin: 0 0 1em; max-width: var(--measure); }

a { color: inherit; text-decoration-color: var(--rule-strong); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }

/* labels / technical chrome in mono */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 0 1rem;
}

/* layout primitives */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(var(--gutter), 5vw, 48px);
}
section { padding-block: var(--section-y); }
section + section { border-top: 1px solid var(--rule); }

.lede { font-size: var(--step-1); color: var(--ink-muted); max-width: 54ch; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.02em;
  padding: 0.8em 1.3em;
  border-radius: var(--radius);
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform .12s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--cta-bg); color: var(--cta-fg); }
.btn-ghost   { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.btn-ghost:hover { border-color: var(--ink); }

/* site header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 0.85rem;
}
.wordmark {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 400;
  letter-spacing: 0;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.wordmark .mark { height: 2em; width: auto; display: block; }
.wordmark-text { display: inline-flex; flex-direction: column; line-height: 1; }
.wordmark-name { line-height: 1; }
.wordmark-strap {
  font-family: var(--font-display);
  font-size: var(--step--2, 0.72rem);
  letter-spacing: 0.02em;
  color: var(--ink-muted);
  margin-top: 0.2em;
}
.nav { display: flex; align-items: center; gap: clamp(1rem, 2.5vw, 2rem); }
.nav a { font-size: var(--step--1); text-decoration: none; color: var(--ink-muted); }
.nav a:hover { color: var(--ink); }
.nav .btn { color: var(--cta-fg); }
@media (max-width: 760px) { .nav .nav-link { display: none; } }

/* language switch — survives the mobile nav collapse (not a .nav-link) */
.lang-switch { display: inline-flex; align-items: center; gap: 0.45rem; font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.04em; white-space: nowrap; }
.lang-switch .lang-opt { color: var(--ink-muted); text-decoration: none; }
.lang-switch a.lang-opt:hover { color: var(--ink); }
.lang-switch .lang-opt.is-current { color: var(--ink); }
.lang-switch .lang-opt + .lang-opt::before { content: "·"; margin-right: 0.45rem; color: var(--ink-faint); }

/* footer */
.site-footer {
  border-top: 1px solid var(--rule);
  padding-block: 3rem;
  color: var(--ink-muted);
  font-size: var(--step--1);
}
.site-footer .container { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: space-between; }

.prose { max-width: var(--measure); }
.prose b { font-weight: 600; }

/* hand-drawn pencil underline under emphasised words — "smart analogue" */
.prose b, .acts b {
  background-image: linear-gradient(transparent 82%, var(--rule-strong) 82%, var(--rule-strong) 92%, transparent 92%);
  background-repeat: no-repeat;
  padding-bottom: 1px;
}

/* ledger / graph-paper placeholder frames (P2 fills these) */
.vis-frame {
  position: relative;
  border: 1.5px dashed var(--rule-strong);
  border-radius: var(--radius);
  background-color: var(--paper-raised);
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 22px 22px;
  min-height: 320px;
  display: grid; place-items: center;
}
.vis-label {
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  background: var(--paper);
  padding: 0.3em 0.7em;
  border-radius: 6px;
}

/* hero */
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.hero-copy { padding-block: 2rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.reassure { font-family: var(--font-mono); font-size: var(--step--1); color: var(--ink-muted); margin-top: 1rem; }
.hero-vis { min-height: 380px; }
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-vis { min-height: 240px; order: -1; }
}

/* the manual loop */
.loop { list-style: none; counter-reset: loop; padding: 0; margin: 2rem 0; max-width: 640px; }
.loop li {
  counter-increment: loop;
  display: grid; grid-template-columns: 2.2rem 7rem 1fr; align-items: baseline;
  gap: 0.5rem 1rem; padding: 0.7rem 0; border-top: 1px solid var(--rule);
}
.loop li::before {
  content: counter(loop, decimal-leading-zero);
  font-family: var(--font-mono); font-size: var(--step--1); color: var(--ink-faint);
}
.loop-k { font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); }
.loop-v { color: var(--ink-muted); }
@media (max-width: 560px) { .loop li { grid-template-columns: 2rem 1fr; } .loop-v { grid-column: 2; } }

/* how-it-works acts */
.how-vis { min-height: 360px; margin: 2.5rem 0; }
.acts { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; gap: 0.2rem; }
.acts li { display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; align-items: baseline; padding: 0.9rem 0; border-top: 1px solid var(--rule); color: var(--ink-muted); }
.acts b { color: var(--ink); }
.act-n { font-family: var(--font-mono); color: var(--ink-faint); font-size: var(--step--1); }

/* state-glyph legend line under the walkthrough */
.specimen-line { font-family: var(--font-mono); font-size: var(--step--1); color: var(--ink-muted); letter-spacing: .01em; margin: 1.1rem 0 0; }
.specimen-line .sp-k { color: var(--ink); }
.specimen-line .sp-review { color: var(--conf-review); }
.specimen-line .sp-conflict { color: var(--conf-conflict); }
.specimen-line .sp-ok { color: var(--conf-ok); }

/* capability two-column, alternating */
.cap { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.cap-vis { min-height: 340px; }
.cap-visband { display: grid; gap: .6rem; align-content: center; }
.scene-controls { display: flex; gap: .5rem; justify-content: flex-end; }
.scene-controls button { font-family: var(--font-mono); font-size: var(--step--1); padding: .45em .8em; border: 1px solid var(--rule-strong); border-radius: 7px; background: var(--paper-raised); color: var(--ink-muted); cursor: pointer; }
.scene-controls button:hover { border-color: var(--ink); color: var(--ink); }
.cap-right .cap-copy { order: 2; }
@media (max-width: 860px) {
  .cap { grid-template-columns: 1fr; }
  .cap-vis { min-height: 220px; }
  .cap-right .cap-copy { order: 0; }
}

/* worked-example teaser (links to the standalone example page) */
.example-teaser {
  display: block;
  margin: clamp(2rem, 4vw, 3rem) 0 1.75rem;
  max-width: 760px;
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 0.5rem;
  box-shadow: 0 1px 0 var(--rule), 0 16px 32px -26px rgba(33, 29, 24, 0.55);
  transition: transform .15s ease, box-shadow .15s ease;
}
.example-teaser:hover { transform: translateY(-2px); box-shadow: 0 1px 0 var(--rule), 0 22px 38px -24px rgba(33, 29, 24, 0.6); }
.example-teaser img { display: block; width: 100%; height: auto; border-radius: 6px; border: 1px solid var(--rule); }
/* on phones the wide grab is illegible fit-to-width — run it edge-to-edge and
   let it swipe at a legible size (pinch-zoom still works for fine detail) */
@media (max-width: 680px) {
  .example-teaser {
    width: 100vw; margin-inline: calc(50% - 50vw);
    border-radius: 0; border-inline: 0; padding: 0.4rem 0;
    overflow-x: auto; -webkit-overflow-scrolling: touch;
  }
  .example-teaser img { width: auto; max-width: none; min-width: 720px; border-radius: 0; }
}

/* outcomes questions — pencil-ticked list */
.questions { list-style: none; padding: 0; margin: 2rem 0; display: grid; gap: 0.1rem; max-width: 60ch; }
.questions li {
  font-family: var(--font-display); font-size: var(--step-1); line-height: 1.25;
  padding: 0.75rem 0 0.75rem 2rem; border-top: 1px solid var(--rule); position: relative;
}
.questions li::before {
  content: "→"; position: absolute; left: 0; top: 0.8rem;
  font-family: var(--font-mono); color: var(--itten-blue); font-size: var(--step-0);
}

/* contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.contact-form {
  background: var(--paper-raised); border: 1px solid var(--rule);
  border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem);
  display: grid; gap: 0.9rem;
}
.form-title { font-family: var(--font-display); font-size: var(--step-1); margin: 0; }
.contact-form label { display: grid; gap: 0.35rem; font-family: var(--font-mono); font-size: var(--step--1); color: var(--ink-muted); letter-spacing: 0.02em; }
.contact-form input, .contact-form textarea {
  font-family: var(--font-body); font-size: var(--step-0); color: var(--ink);
  background: var(--paper); border: 1px solid var(--rule-strong); border-radius: 8px;
  padding: 0.6em 0.7em; width: 100%;
}
.contact-form input:focus, .contact-form textarea:focus { outline: 2px solid var(--itten-blue); outline-offset: 1px; border-color: transparent; }
.contact-form .btn { justify-content: center; margin-top: 0.3rem; }
.form-fallback { font-family: var(--font-mono); font-size: var(--step--1); color: var(--ink-muted); margin: 0; text-align: center; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }

/* scroll reveal */
section { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
section.is-visible, #hero { opacity: 1; transform: none; }

/* motion safety */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}