/* calcytas.com — site stylesheet.
 *
 * Palette and type come from the Calcytas brochure: bone and obsidian grounds,
 * one amber accent, Cormorant Garamond for display, Manrope for text, IBM Plex
 * Mono for labels. The fonts are self-hosted woff2; nothing loads from another
 * origin.
 *
 * The rule that keeps the design disciplined: amber marks structure (eyebrows,
 * rules, numbers), never decoration for its own sake, and body text stays on
 * ink. Contrast is asserted by scripts/check_site.py against the tokens below;
 * keep the ratios in the comments current when you touch a token.
 */

/* ---- Fonts ------------------------------------------------------------- */

@font-face { font-family: "Calcytas Display"; font-weight: 300; font-style: normal; font-display: swap; src: url("/fonts/cormorant-garamond-300-normal.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Display"; font-weight: 500; font-style: normal; font-display: swap; src: url("/fonts/cormorant-garamond-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Display"; font-weight: 400; font-style: italic; font-display: swap; src: url("/fonts/cormorant-garamond-400-italic.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Sans"; font-weight: 300; font-style: normal; font-display: swap; src: url("/fonts/manrope-300-normal.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Sans"; font-weight: 400; font-style: normal; font-display: swap; src: url("/fonts/manrope-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Sans"; font-weight: 500; font-style: normal; font-display: swap; src: url("/fonts/manrope-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Sans"; font-weight: 600; font-style: normal; font-display: swap; src: url("/fonts/manrope-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Mono"; font-weight: 400; font-style: normal; font-display: swap; src: url("/fonts/ibm-plex-mono-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Calcytas Mono"; font-weight: 500; font-style: normal; font-display: swap; src: url("/fonts/ibm-plex-mono-500-normal.woff2") format("woff2"); }

/* ---- Tokens ------------------------------------------------------------ */

:root {
  /* Light: bone. */
  --ground: #F4F0E8;
  --surface: #ECE6DA;
  --raised: #FBF8F2;
  --ink: #14161A;
  --ink-muted: #4F535B;
  --accent-ink: #8C5A12;
  --accent: #B07A2A;
  --rule: #CFC6B6;
  --mark-ring: #B07A2A;

  /* Fixed obsidian: the hero, the access band and the footer stay dark in
     both themes, because the vault has no windows. */
  --obs: #0E0F12;
  --obs-surface: #16181C;
  --obs-ink: #F4F0E8;
  --obs-muted: #B3ADA2;
  --obs-accent: #E3A548;
  --obs-rule: #2C2E34;

  --font-display: "Calcytas Display", "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --font-sans: "Calcytas Sans", "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Calcytas Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;

  --shell: 72rem;
  --gutter: 1rem;
  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .2, 1);

  color-scheme: light;
}

@media (min-width: 40rem) { :root { --gutter: 1.5rem; } }
@media (min-width: 64rem) { :root { --gutter: 2rem; } }

/* Dark: obsidian. Two selectors on purpose: the media query serves visitors
   who have not chosen, and [data-theme="dark"] serves the toggle. A visitor
   who chose light on a dark-preferring system keeps light. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0E0F12;
    --surface: #14161A;
    --raised: #1A1C21;
    --ink: #F4F0E8;
    --ink-muted: #ABA59A;
    --accent-ink: #E3A548;
    --accent: #E3A548;
    --rule: #2C2E34;
    --mark-ring: #E3A548;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --ground: #0E0F12;
  --surface: #14161A;
  --raised: #1A1C21;
  --ink: #F4F0E8;
  --ink-muted: #ABA59A;
  --accent-ink: #E3A548;
  --accent: #E3A548;
  --rule: #2C2E34;
  --mark-ring: #E3A548;
  color-scheme: dark;
}

/* ---- Base -------------------------------------------------------------- */

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 1.5rem; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 400 1rem/1.7 var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.0625rem);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

img { display: block; max-width: 100%; height: auto; }

a {
  color: var(--ink);
  text-decoration-line: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  transition: text-decoration-color .2s var(--ease), color .2s var(--ease);
}
a:hover { color: var(--accent-ink); text-decoration-thickness: 2px; }

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent-ink);
  outline-offset: 3px;
  border-radius: var(--radius);
}
.band--obsidian :focus-visible, .footer :focus-visible { outline-color: var(--obs-accent); }
main:focus { outline: none; }

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: .7rem 1rem;
  background: var(--obs);
  color: var(--obs-ink);
  font: 500 .875rem var(--font-sans);
  transition: top .15s var(--ease);
}
.skip-link:focus { top: 1rem; }

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---- Type -------------------------------------------------------------- */

h1, h2, h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: -0.005em;
  line-height: 1.05;
  text-wrap: balance;
}
h1 { font-size: clamp(2.75rem, 1.6rem + 5.6vw, 5.5rem); letter-spacing: 0.005em; }
h2 { font-size: clamp(2.25rem, 1.5rem + 3.4vw, 3.5rem); }
h3 { font-size: 1.5rem; font-weight: 500; line-height: 1.2; letter-spacing: 0; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }
strong { font-weight: 600; }

.eyebrow {
  margin: 0 0 1.25rem;
  font: 500 .75rem/1.3 var(--font-mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.band--obsidian .eyebrow { color: var(--obs-accent); }

.rule::after, h1.rule::after, h2.rule::after {
  content: "";
  display: block;
  width: 3rem;
  height: 1.5px;
  margin-top: 1.25rem;
  background: var(--accent);
}
.band--obsidian .rule::after { background: var(--obs-accent); }

.lead {
  max-width: 38ch;
  font: 300 clamp(1.5rem, 1.15rem + 1.5vw, 2.1rem)/1.3 var(--font-display);
  color: var(--ink);
}
.band--obsidian .lead { color: var(--obs-ink); }

.kicker {
  margin: 0 0 1.5rem;
  font: italic 400 clamp(1.35rem, 1.1rem + 1vw, 1.75rem)/1.3 var(--font-display);
  color: var(--accent-ink);
}

.prose { max-width: 40rem; }
.prose p { color: var(--ink); }

.muted { color: var(--ink-muted); }

/* ---- Masthead ---------------------------------------------------------- */

.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--ground);
}
.masthead__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
  min-height: 4.5rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font: 500 1.0625rem/1 var(--font-sans);
  letter-spacing: .28em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
}
.wordmark svg { width: 1.9rem; height: 1.9rem; }
.wordmark:hover { color: var(--ink); }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem 1.5rem;
  order: 3;
  width: 100%;
  padding-bottom: .9rem;
}
.nav a {
  padding: .45rem 0;
  font: 500 .8125rem/1.2 var(--font-sans);
  letter-spacing: .02em;
  text-decoration: none;
  border-bottom: 1.5px solid transparent;
}
.nav a:hover { border-bottom-color: var(--accent); color: var(--ink); }
.nav a[aria-current="page"] { border-bottom-color: var(--accent); color: var(--accent-ink); }

.masthead__actions { display: flex; align-items: center; gap: .25rem; }

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}
.icon-button:hover { border-color: var(--rule); background: var(--surface); }
.icon-button svg { width: 1.35rem; height: 1.35rem; }

/* The toggle shows the theme you would switch TO: a moon on bone, a sun on
   obsidian. */
.icon-sun { display: none; }
.icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }

/* No script, no menu button: the links simply wrap under the wordmark. With
   script, the narrow-screen nav folds behind the button. */
#nav-toggle { display: none; }
.js #nav-toggle { display: inline-grid; }
.js .nav { display: none; flex-direction: column; gap: 0; }
.js .nav[data-open="true"] { display: flex; }
.js .nav a { padding: .8rem 0; border-bottom: 1px solid var(--rule); }

@media (min-width: 56rem) {
  .nav, .js .nav, .js .nav[data-open="true"] {
    display: flex;
    flex-direction: row;
    order: 0;
    width: auto;
    padding-bottom: 0;
    gap: .25rem 1.75rem;
  }
  .js .nav a { padding: .45rem 0; border-bottom: 1.5px solid transparent; }
  .js .nav a:hover, .js .nav a[aria-current="page"] { border-bottom-color: var(--accent); }
  .js #nav-toggle { display: none; }
}

/* ---- Bands ------------------------------------------------------------- */

.band { padding-block: clamp(3.5rem, 2rem + 6vw, 7rem); }
.band--surface { background: var(--surface); }
.band--obsidian {
  background: var(--obs);
  color: var(--obs-ink);
}
.band--obsidian a { color: var(--obs-ink); text-decoration-color: var(--obs-accent); }
.band--obsidian a:hover { color: var(--obs-accent); }
.band--obsidian .muted { color: var(--obs-muted); }

.band + .band:not(.band--surface):not(.band--obsidian) { border-top: 1px solid var(--rule); }

/* ---- Hero -------------------------------------------------------------- */

.hero { padding-block: clamp(2.5rem, 1.5rem + 4vw, 6rem); }
.hero__grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}
.hero__art { order: -1; margin: 0; }
.hero__art img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: 50% 38%;
  border-radius: var(--radius);
}
.hero__text .lead { margin-top: 1.75rem; }
.hero__status {
  margin-top: 2rem;
  font: 400 .75rem/1.4 var(--font-mono);
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--obs-muted);
}

@media (min-width: 56rem) {
  .hero__grid { grid-template-columns: 1.15fr .85fr; gap: 4rem; }
  .hero__art { order: 0; }
  .hero__art img { aspect-ratio: 3 / 4; max-height: 40rem; }
}

/* ---- Equation ---------------------------------------------------------- */

.equation {
  display: grid;
  gap: .35rem;
  justify-items: center;
  margin: 0;
  text-align: center;
  font: italic 400 clamp(1.9rem, 1.1rem + 3.4vw, 3.4rem)/1.15 var(--font-display);
  color: var(--ink);
}
.equation .term { display: block; }
.equation .term--result { color: var(--accent-ink); }
.equation .op { font-style: normal; font-weight: 300; color: var(--accent-ink); }

@media (min-width: 64rem) {
  .equation { grid-auto-flow: column; justify-content: center; align-items: baseline; gap: 1.25rem; }
}

/* ---- Triad ------------------------------------------------------------- */

.triad {
  display: grid;
  gap: 1px;
  margin: 3rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.triad > li { padding: 1.75rem 1.5rem 2rem; background: var(--ground); }
.band--surface .triad > li { background: var(--surface); }
.triad h3 { margin: 0 0 .75rem; }
.triad p { color: var(--ink); }
.triad a { color: var(--ink); }
.triad .eyebrow { margin-bottom: .9rem; }

@media (min-width: 56rem) {
  .triad { grid-template-columns: repeat(3, 1fr); }
  .triad > li { padding: 2.25rem 2rem 2.5rem; }
}

/* ---- Statement --------------------------------------------------------- */

.statement {
  max-width: 22ch;
  margin: 0 auto;
  text-align: center;
  font: italic 400 clamp(2rem, 1.2rem + 3.6vw, 3.75rem)/1.2 var(--font-display);
  text-wrap: balance;
}
.statement--left { margin: 0; text-align: left; }

/* ---- Tiles (home page index) ------------------------------------------- */

.tiles {
  display: grid;
  gap: 1.5rem;
  margin: 3rem 0 0;
  padding: 0;
  list-style: none;
}
.tile {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--raised);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.tile:hover, .tile:focus-within { border-color: var(--accent); transform: translateY(-2px); }
.tile img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.tile__body { padding: 1.25rem 1.4rem 1.6rem; }
.tile h3 { margin: 0 0 .35rem; }
.tile h3 a { text-decoration: none; }
/* The whole card is the target; the heading link stretches over it. */
.tile h3 a::after { content: ""; position: absolute; inset: 0; }
.tile .kicker { margin: 0 0 .6rem; font-size: 1.2rem; }
.tile p:last-child { color: var(--ink-muted); font-size: .9375rem; line-height: 1.6; }

@media (min-width: 40rem) { .tiles { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 64rem) { .tiles { grid-template-columns: repeat(4, 1fr); gap: 1.25rem; } }

/* ---- Page head and figures --------------------------------------------- */

.page-head { padding-block: clamp(3rem, 1.5rem + 5vw, 6rem) clamp(2rem, 1rem + 3vw, 3.5rem); }
.page-head h1 { max-width: 16ch; }
.page-head .lead { margin-top: 2rem; }

.figure { margin: 0; }
.figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
}

.split { display: grid; gap: 2.5rem; }
@media (min-width: 56rem) {
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 4rem; align-items: start; }
  .split--wide-left { grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); }
  .split > .figure { position: sticky; top: 2rem; }
}

.section-intro { margin-bottom: 2.5rem; }
.section-intro h2 { max-width: 18ch; }

/* ---- Lists ------------------------------------------------------------- */

.points { margin: 1.5rem 0 0; padding: 0; list-style: none; }
.points li {
  padding: .9rem 0;
  border-top: 1px solid var(--rule);
}
.points li:last-child { border-bottom: 1px solid var(--rule); }

.steps { margin: 2rem 0 0; padding: 0; list-style: none; counter-reset: step; }
.steps li {
  position: relative;
  counter-increment: step;
  padding: 1.1rem 0 1.1rem 3.25rem;
  border-top: 1px solid var(--rule);
}
.steps li:last-child { border-bottom: 1px solid var(--rule); }
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.4rem;
  font: 500 .75rem/1 var(--font-mono);
  letter-spacing: .06em;
  color: var(--accent-ink);
}

.claims { margin: 2.5rem 0 0; display: grid; gap: 2rem; }
.claims h3 { margin: 0 0 .5rem; }
.claims p { margin: 0; }
.claims > div { padding-top: 1.25rem; border-top: 1.5px solid var(--accent); }
@media (min-width: 56rem) { .claims--3 { grid-template-columns: repeat(3, 1fr); gap: 2.5rem; } }

/* Definition lists as the brochure's two-column tables: term, then meaning. */
.defs { margin: 2.5rem 0 0; }
.defs > div {
  display: grid;
  gap: .4rem 2.5rem;
  padding: 1.4rem 0;
  border-top: 1px solid var(--rule);
}
.defs > div:last-child { border-bottom: 1px solid var(--rule); }
.defs dt { font: 500 1.5rem/1.2 var(--font-display); }
.defs dd { margin: 0; max-width: 40rem; }
@media (min-width: 48rem) {
  .defs > div { grid-template-columns: minmax(0, 15rem) minmax(0, 1fr); }
}

/* ---- Illustration ------------------------------------------------------ */

.illustration {
  margin: 3rem 0 0;
  padding: 2rem 0;
  border-top: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
}
.illustration p:not(.eyebrow) {
  max-width: 34ch;
  margin: 0;
  font: italic 400 clamp(1.5rem, 1.1rem + 1.6vw, 2.15rem)/1.4 var(--font-display);
}

/* ---- Access ------------------------------------------------------------ */

.access { text-align: center; }
.access h2 { margin-inline: auto; max-width: 14ch; }
.access h2.rule::after { margin-inline: auto; }
.access p { max-width: 36rem; margin-inline: auto; }
.access .eyebrow { margin-bottom: 1.5rem; }
.access h2 + p { margin-top: 1.75rem; }

.notice { padding-top: 2rem; border-top: 1px solid var(--rule); }
.notice p { font-size: .9375rem; line-height: 1.65; color: var(--ink-muted); max-width: 46rem; }
.notice strong { color: var(--ink); }

/* ---- Footer ------------------------------------------------------------ */

.footer {
  padding-block: clamp(3rem, 2rem + 3vw, 4.5rem) 2.5rem;
  background: var(--obs);
  color: var(--obs-ink);
  border-top: 1px solid var(--obs-rule);
}
.footer a { color: var(--obs-ink); text-decoration-color: transparent; }
.footer a:hover { color: var(--obs-accent); text-decoration-color: var(--obs-accent); }
.footer__grid { display: grid; gap: 2rem; }
.footer__brand {
  margin: 0 0 .75rem;
  font: 300 2.25rem/1 var(--font-display);
  letter-spacing: .04em;
}
.footer__tag {
  max-width: 30ch;
  margin: 0;
  font: italic 400 1.25rem/1.4 var(--font-display);
  color: var(--obs-accent);
}
.footer ul { margin: 0; padding: 0; list-style: none; }
.footer li { margin: 0; }
.footer li a { display: inline-block; padding: .35rem 0; font-size: .9375rem; }
.footer__truth {
  margin: 2.5rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--obs-rule);
  font: 500 .875rem/1.5 var(--font-sans);
  color: var(--obs-ink);
}
.footer__note {
  max-width: 52rem;
  margin: .9rem 0 0;
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--obs-muted);
}
.footer__note a { text-decoration-color: var(--obs-accent); }
@media (min-width: 48rem) { .footer__grid { grid-template-columns: 1.2fr .8fr; align-items: start; } }

/* ---- Motion ------------------------------------------------------------ */

/* .reveal fails toward visible: it hides nothing unless script has set .js, the
   script reveals everything on a timer even if the observer never fires, and
   reduced motion turns the whole thing off. */
.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .tile:hover, .tile:focus-within { transform: none; }
}

@media print {
  .masthead__actions, .skip-link { display: none; }
  body { background: #fff; color: #000; }
}