/* ==========================================================================
   ARCHÉ LAB — DESIGN SYSTEM
   --------------------------------------------------------------------------
   Concept: apothecary instrumentation. Three type roles carry the identity —
   blackletter for the mark (old-world science), monospace for data and labels
   (instrumentation), grotesque for everything read at length (operational
   clarity). Light cream is the working field; ink is punctuation, not the
   default. Panels are sharp; anything interactive is a pill.
   ========================================================================== */

:root {
  /* --- COLOR ------------------------------------------------------------
     Warm neutral ramp. No saturated brand color: hierarchy comes from
     weight, scale, and field inversion instead. */
  --ink: #010101;
  --ink-soft: #565654;
  --paper: #ffffff;
  --cream: #f1f0ea;
  --cream-dim: #e6e3d6;
  --rule: #d8d8d4;
  --rule-strong: #b0b0a9;
  --tan: #bdad96;

  /* semantic roles — components reference these, never the ramp directly */
  --field: var(--cream);
  --field-raised: var(--paper);
  --field-invert: var(--ink);
  --text: var(--ink);
  --text-muted: #6c6e6b;
  --text-faint: var(--rule-strong);
  --text-invert: var(--paper);
  --text-invert-muted: var(--rule);
  --text-invert-faint: var(--rule-strong);
  --text-invert-dim: #8a8a86;   /* quieter than faint, still AA on ink */
  --border: var(--rule);
  --border-invert: var(--ink-soft);
  --focus: var(--ink);

  /* --- TYPE -------------------------------------------------------------
     identity : DS Fette Gotisch  — the mark, used once per view, never body
     display  : Space Grotesk     — headings
     body     : General Sans      — reading text, UI
     data     : Fragment Mono     — labels, tags, numbers, form meta */
  --font-identity: "DS Fette Gotisch", "Space Grotesk", serif;
  --font-display: "Space Grotesk", "General Sans", system-ui, sans-serif;
  --font-body: "General Sans", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-data: "Fragment Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* scale — 18px root, 1.25 ratio, clamped for fluid display sizes */
  --t-mark: clamp(3.5rem, 11vw, 9.5rem);
  --t-1: clamp(2rem, 3.6vw, 3.1111rem);
  --t-2: clamp(1.6rem, 2.4vw, 2.1rem);
  --t-3: 1.3889rem;
  --t-lead: 1.2778rem;
  --t-body: 1rem;
  --t-small: 0.9444rem;
  --t-label: 0.7222rem;

  --track-label: 0.03em;  /* mono labels */
  --track-display: -0.02em; /* tight display headings */

  /* --- SPACE ------------------------------------------------------------ */
  --s-1: 0.5rem;
  --s-2: 1rem;
  --s-3: 1.75rem;
  --s-4: 2.5rem;
  --s-5: 3.5rem;
  --s-6: 6.25rem;
  --gutter: 1.6667rem;
  --measure: 38rem;      /* max reading width */
  --max-width: 90rem;

  /* --- FORM / SHAPE / MOTION -------------------------------------------- */
  --radius-pill: 999px;
  --radius-panel: 0;
  --nav-h: 4.4444rem;
  --ease: cubic-bezier(0.215, 0.61, 0.355, 1);
  --dur: 0.22s;
}

/* ==========================================================================
   BASE
   ========================================================================== */

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 112.5%; /* 18px */
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
}

body {
  background: var(--field);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--t-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* author display rules would otherwise beat the UA's [hidden] rule */
[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}
.on-invert :focus-visible { outline-color: var(--paper); }

/* ==========================================================================
   TYPE ROLES
   ========================================================================== */

@font-face {
  font-family: "DS Fette Gotisch";
  src: url("ds-fette-gotisch.regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: var(--track-display);
  line-height: 1.05;
}
h1 { font-size: var(--t-1); }
h2 { font-size: var(--t-1); }
h3 {
  font-size: var(--t-3);
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* the mark — identity face, one instance per view */
.mark {
  font-family: var(--font-identity);
  font-weight: 400;
  letter-spacing: 0;
  line-height: 0.95;
  font-size: var(--t-mark);
}

/* data label — mono, tracked caps. every small label in the system uses this */
.label {
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--text-faint);
}
.on-invert .label { color: var(--text-invert-faint); }

.lead {
  font-size: var(--t-lead);
  line-height: 1.45;
  max-width: var(--measure);
  color: var(--text-muted);
}
.on-invert .lead { color: var(--text-invert-muted); }

p { font-size: var(--t-body); color: var(--text-muted); }
.on-invert p { color: var(--text-invert-muted); }

/* ==========================================================================
   LAYOUT
   ========================================================================== */

.section { padding: var(--s-6) var(--gutter); }
.container { max-width: var(--max-width); margin: 0 auto; }
.container-narrow { max-width: 46rem; margin: 0 auto; }

.field-cream  { background: var(--cream); }
.field-paper  { background: var(--paper); }
.field-invert { background: var(--ink); color: var(--text-invert); }
.field-invert h1, .field-invert h2, .field-invert h3 { color: var(--paper); }

/* split header — heading left, supporting line offset right */
.head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--s-3) var(--s-4);
  margin-bottom: var(--s-5);
}
.head .label { grid-column: 1 / 13; margin-bottom: calc(var(--s-2) * -0.5); }
.head h2 { grid-column: 1 / 7; }
.head .lead { grid-column: 8 / 13; align-self: end; }

/* horizontal rule that opens a content block */
.rule-top {
  border-top: 1px solid var(--border);
  padding-top: var(--s-4);
}
.on-invert .rule-top { border-top-color: var(--border-invert); }

/* ==========================================================================
   NAV
   ========================================================================== */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(241, 240, 234, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-2);
}
.nav-mark {
  font-family: var(--font-identity);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--ink);
  white-space: nowrap;
}
.nav-links { display: flex; gap: var(--s-4); }
.nav-links a {
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--text-muted);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.is-active { color: var(--ink); border-bottom-color: var(--ink); }

.nav-toggle {
  display: none;
  width: 2.4rem; height: 2.4rem;
  background: none;
  border: 1px solid var(--border-invert);
  border-radius: var(--radius-pill);
  cursor: pointer;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
  left: 50%; transform: translateX(-50%);
  width: 14px; height: 1.5px;
  background: var(--ink);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle span { top: 50%; margin-top: -0.75px; }
.nav-toggle span::before { top: -5px; left: 0; transform: none; }
.nav-toggle span::after  { top: 5px;  left: 0; transform: none; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after  { transform: translateY(-5px) rotate(-45deg); }

.nav-panel {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--cream);
  padding: var(--s-2) var(--gutter) var(--s-3);
}
.nav-panel a {
  display: block;
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  padding: var(--s-2) 0;
  border-bottom: 1px solid var(--border);
}
.nav-panel.is-open { display: block; }

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 2.8889rem;
  padding: 0 1.6667rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  border: 1px solid var(--ink);
  background: none;
  color: var(--ink);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.btn-sm { height: 2.4444rem; padding: 0 1.2rem; }
.btn-solid { background: var(--ink); color: var(--paper); }
.btn-solid:hover { background: var(--ink-soft); border-color: var(--ink-soft); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
.on-invert .btn { border-color: var(--paper); color: var(--paper); }
.on-invert .btn-solid { background: var(--paper); color: var(--ink); }
.on-invert .btn-solid:hover { background: var(--rule); border-color: var(--rule); }
.on-invert .btn-ghost:hover { background: var(--paper); color: var(--ink); }

.link-arrow {
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  align-self: flex-start;
  transition: opacity var(--dur) var(--ease);
}
.link-arrow:hover { opacity: 0.55; }

/* ==========================================================================
   HERO
   ========================================================================== */

.hero {
  min-height: 100vh;
  /* symmetric block padding so the centre row lands on the true viewport centre */
  padding: var(--nav-h) var(--gutter);
  display: flex;
  align-items: stretch;
  justify-content: center;
  text-align: center;
}
/* three rows — equal flexible spacers above and below the wordmark, so the
   wordmark sits at the vertical centre and everything else flows beneath it */
.hero-inner {
  max-width: var(--max-width);
  width: 100%;
  display: grid;
  /* top spacer lighter than the bottom, so the wordmark sits just above centre */
  grid-template-rows: 0.75fr auto 1fr;
  justify-items: center;
}
.hero-inner::before { content: ""; }
.hero .mark { margin-bottom: 0; }
.hero-rest {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: var(--s-2);
}
/* Set in a serif: Space Grotesk has neither a true italic nor a Greek subset,
   so this gives real italic outlines and polytonic coverage in one face —
   which is also how an encyclopedia typesets a headword and its original script */
.hero-def {
  font-family: "Palatino Linotype", Palatino, "Times New Roman", Times, serif;
  font-style: italic;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-invert-dim);
  margin-bottom: var(--s-3);
}
.hero-def .gr { text-transform: none; letter-spacing: 0.05em; }
.hero-sub {
  font-size: var(--t-lead);
  line-height: 1.5;
  color: var(--text-invert-muted);
  max-width: 32rem;
  margin-bottom: var(--s-4);
}
.actions { display: flex; justify-content: center; gap: 0.875rem; flex-wrap: wrap; }

/* ==========================================================================
   STAGES — the four-stage progression
   ========================================================================== */

.stages {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-4);
}
.stage-num {
  display: block;
  font-family: var(--font-display);
  font-size: 3.3333rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: var(--track-display);
  color: var(--text-faint);
  margin-bottom: var(--s-2);
}
.stage h3 { color: var(--ink); margin-bottom: var(--s-1); }
.stage p { font-size: var(--t-small); }

/* ==========================================================================
   STATEMENT — full-bleed thesis line
   ========================================================================== */

.statement { padding: var(--s-6) var(--gutter); }
.statement p:not(.label) {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.75rem, 3.6vw, 2.8889rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 46rem;
  margin-top: var(--s-2);
}

/* ==========================================================================
   PRINCIPLES — how we think about building
   ========================================================================== */

.principles { border-top: 1px solid var(--border); }
.principle {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: var(--s-3);
  align-items: start;
  padding: var(--s-4) 0;
  border-bottom: 1px solid var(--border);
}
.principle-num {
  font-family: var(--font-data);
  font-size: var(--t-label);
  letter-spacing: var(--track-label);
  color: var(--text-faint);
  padding-top: 0.55rem;
}
.principle h3 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.6vw, 2.1667rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-bottom: var(--s-1);
}
.principle p { font-size: var(--t-small); max-width: 38rem; }

/* ==========================================================================
   INCLUDES — what membership covers
   ========================================================================== */

.includes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--border);
}
.include {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: var(--s-3);
  padding: var(--s-3) var(--s-3) var(--s-3) 0;
  border-bottom: 1px solid var(--border);
}
.include:nth-child(odd) { border-right: 1px solid var(--border); padding-right: var(--s-4); }
.include:nth-child(even) { padding-left: var(--s-4); }
.include h3 { font-size: var(--t-body); font-weight: 600; color: var(--ink); }
.include p { font-size: var(--t-small); margin-top: 0.3rem; }

/* ==========================================================================
   TRACKS
   ========================================================================== */

.tracks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.track {
  background: var(--cream);
  padding: var(--s-3);
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}
.track p { font-size: var(--t-small); flex-grow: 1; }

/* ==========================================================================
   PROCESS — application steps
   ========================================================================== */

.process {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-3);
  margin-bottom: var(--s-5);
}
.step { border-top: 1px solid var(--border); padding-top: var(--s-2); }
.step h3 { font-size: var(--t-body); font-weight: 600; color: var(--ink); margin: var(--s-1) 0 0.3rem; }
.step p { font-size: var(--t-small); }

/* ==========================================================================
   FORM
   ========================================================================== */

.form { display: grid; gap: var(--s-3); }
.form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--s-3); }
.field { display: grid; gap: 0.45rem; }
.field > label {
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--text-muted);
}
.field input,
.field select,
.field textarea {
  font-family: var(--font-body);
  font-size: var(--t-body);
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-panel);
  padding: 0.75rem 0.85rem;
  width: 100%;
  transition: border-color var(--dur) var(--ease);
}
.field textarea { min-height: 7rem; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus { border-color: var(--ink); outline: none; }
.field input::placeholder,
.field textarea::placeholder { color: var(--text-faint); }
.field.has-error input,
.field.has-error select,
.field.has-error textarea { border-color: var(--ink); border-width: 2px; }
.field-error {
  font-family: var(--font-data);
  font-size: var(--t-label);
  color: var(--ink);
  display: none;
}
.field.has-error .field-error { display: block; }

/* segmented track selector */
.segmented { display: flex; flex-wrap: wrap; gap: var(--s-1); }
/* visually hidden, but still focusable — the label beside it is the visible
   control. Size must be pinned: .field input sets width:100%, and on an
   absolutely positioned box that resolves against the viewport and overflows. */
.segmented input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}
.segmented label {
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-pill);
  padding: 0.55rem 1.1rem;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.segmented label:hover { border-color: var(--ink); }
.segmented input:checked + label { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.segmented input:focus-visible + label { outline: 2px solid var(--focus); outline-offset: 3px; }

.form-note { font-family: var(--font-data); font-size: var(--t-label); color: var(--text-faint); }
.form-status {
  display: none;
  border: 1px solid var(--ink);
  padding: var(--s-3);
  font-size: var(--t-small);
  color: var(--ink);
}
.form-status.is-visible { display: block; }
.form-status h3 { margin-bottom: 0.4rem; color: var(--ink); }

/* ==========================================================================
   FAQ — native disclosure, no JS required
   ========================================================================== */

.faq { border-top: 1px solid var(--border); }
.faq details { border-bottom: 1px solid var(--border); }
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: var(--s-3) 2.5rem var(--s-3) 0;
  font-family: var(--font-display);
  font-size: var(--t-3);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  position: relative;
  transition: opacity var(--dur) var(--ease);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { opacity: 0.6; }
.faq summary::after {
  content: '+';
  position: absolute;
  right: 0.25rem; top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-data);
  font-size: 1.3rem;
  color: var(--text-faint);
}
.faq details[open] summary::after { content: '–'; }
.faq details p {
  font-size: var(--t-small);
  max-width: var(--measure);
  padding-bottom: var(--s-3);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer { background: var(--cream-dim); padding: var(--s-5) var(--gutter) var(--s-3); }
.footer-top { margin-bottom: var(--s-4); }
.footer .nav-mark { font-size: 2rem; margin-bottom: var(--s-1); display: block; }
.footer-tagline { font-size: var(--t-small); color: var(--text-muted); }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-1) var(--s-4);
  border-top: 1px solid var(--rule-strong);
  padding-top: var(--s-3);
  margin-bottom: var(--s-3);
}
.footer-links a {
  font-family: var(--font-data);
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: var(--track-label);
  color: var(--ink);
  transition: opacity var(--dur) var(--ease);
}
.footer-links a:hover { opacity: 0.55; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: var(--s-2);
  flex-wrap: wrap;
  font-family: var(--font-data);
  font-size: var(--t-label);
  color: var(--text-faint);
  border-top: 1px solid var(--rule-strong);
  padding-top: var(--s-3);
}

/* ==========================================================================
   TEXT SCRAMBLE
   Mono keeps character width fixed so decoding can't shift layout.
   ========================================================================== */

.scramble, .scramble-hover { font-family: var(--font-data); }
.scramble-char { opacity: 0.5; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; }
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 1000px) {
  .stages { grid-template-columns: repeat(2, 1fr); gap: var(--s-4) var(--s-3); }
  .process { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: block; }
  /* collapse to one column: a 12-track grid cannot shrink below its 11
     column gaps (11 x 2.5rem = 495px), which overflows a phone viewport */
  .head { grid-template-columns: 1fr; }
  .head .label, .head h2, .head .lead { grid-column: auto; }
  .head .lead { align-self: start; }
  .tracks { grid-template-columns: 1fr; }
  .includes { grid-template-columns: 1fr; }
  .include:nth-child(odd) { border-right: none; padding-right: 0; }
  .include:nth-child(even) { padding-left: 0; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  :root { --s-6: 4.5rem; }
  .stages, .process { grid-template-columns: 1fr; }
  .principle { grid-template-columns: 1fr; gap: var(--s-1); }
  .principle-num { padding-top: 0; }
  .include { grid-template-columns: 1fr; gap: var(--s-1); }
  .footer-bottom { flex-direction: column; }
}