/* ═══════════════════════════════════════════════════════════════
   CONGRUENCE — brand system v3 (Aicher/Rams/Vignelli lineage)
   Late-70s / 80s German industrial minimalism. Swiss grid. Helvetica.
   Palette: deep teal, cool paper, mint/taupe accents.
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* Core */
  --paper:       #E8E4DE;   /* cool off-white (primary surface) */
  --paper-2:     #DEDAD4;   /* panel */
  --paper-3:     #D0CCC6;   /* rule, hairline */
  --teal:        #2C4F4E;   /* Congruence green, deep */
  --teal-dark:   #1F3B3A;   /* press/shadow green */
  --teal-ink:    #E8E4DE;   /* ink on teal (paper tone) */
  --amber:       #2C4F4E;   /* primary accent (teal) */
  --amber-deep:  #1F3B3A;   /* hover/press */
  --mint:        #8DC4C3;   /* accent on teal/dark surfaces */
  --taupe:       #ADA196;   /* muted secondary */

  --ink:         #141413;   /* near-black text on paper */
  --ink-80:      rgba(20,20,19,.8);
  --ink-60:      rgba(20,20,19,.6);
  --ink-45:      rgba(20,20,19,.45);
  --ink-30:      rgba(20,20,19,.3);
  --ink-15:      rgba(20,20,19,.15);
  --ink-08:      rgba(20,20,19,.08);

  /* Typography — Helvetica Neue everything. */
  --sans: 'Helvetica Neue', 'Helvetica', 'Arial', 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  /* Legacy aliases — old pages referenced --display/--serif */
  --display: 'Helvetica Neue', 'Helvetica', 'Arial', 'Inter', system-ui, sans-serif;
  --serif: 'Helvetica Neue', 'Helvetica', 'Arial', 'Inter', system-ui, sans-serif;
  --paper-inv: #E8E4DE;

  /* Grid */
  --gutter: clamp(24px, 4vw, 56px);
  --maxw: 1320px;

  /* Baseline-ish */
  --bl: 8px;
}

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

html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
strong, b { font-weight: 500; }
em { font-style: normal; color: var(--teal); }

/* ───────── NAV ─────────────────────────────────── */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}
header.site .nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex; align-items: center; gap: 40px;
}
.brandmark {
  display: flex; align-items: center; gap: 10px;
  font-weight: 500; letter-spacing: .02em;
}
.brandmark img { height: 24px; width: auto; display: block; }
.brandmark .wordmark {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .24em;
  text-transform: uppercase;
}
.nav-links {
  display: flex; gap: 0; margin-left: auto; list-style: none;
  align-items: stretch;
}
.nav-links li { display: flex; }
.nav-links li + li { border-left: 1px solid var(--ink-15); }
.nav-links a {
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  font-weight: 500;
  padding: 10px 22px;
  display: inline-flex; align-items: center;
  transition: background .15s, color .15s;
}
.nav-links a:hover, .nav-links a.active { background: var(--ink); color: var(--paper); }
.nav-cta {
  background: var(--teal) !important;
  color: var(--paper) !important;
}
.nav-cta:hover { background: var(--teal-dark) !important; color: var(--paper) !important; }

/* ───────── MOBILE NAV ────────────────────────────── */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  margin: 4px 0;
  transition: transform .2s, opacity .2s;
}

/* ───────── LAYOUT ──────────────────────────────── */
main { display: block; position: relative; }
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(48px, 5.5vw, 96px) var(--gutter);
  position: relative;
}
.section.tight { padding-block: clamp(36px, 4vw, 64px); }
.section.bleed { max-width: none; margin: 0; padding: 0 var(--gutter); }
.section.teal {
  max-width: none;
  background: var(--teal);
  color: var(--teal-ink);
}
.section.amber {
  max-width: none;
  background: var(--amber);
  color: var(--paper);
}
.section.dark {
  max-width: none;
  background: var(--ink);
  color: var(--paper-inv);
}
.section .inner {
  max-width: var(--maxw);
  margin: 0 auto;
}

/* ───────── TYPE ────────────────────────────────── */
/* Display sizes — Helvetica Neue, tight, flush-left */
h1.display, h2.display, h3.display, .display {
  font-family: var(--sans);
  font-weight: 500;
  line-height: .95;
  letter-spacing: -.025em;
  color: var(--ink);
  text-transform: none;
}
h1.display { font-size: clamp(40px, 5vw, 72px); font-weight: 500; }
h2.display { font-size: clamp(28px, 3vw, 42px); }
h3.display { font-size: clamp(20px, 1.8vw, 28px); letter-spacing: -.018em; line-height: 1.05; }

.teal h1.display, .teal h2.display, .teal h3.display, .teal .display { color: var(--teal-ink); }
.amber h1.display, .amber h2.display, .amber h3.display { color: var(--paper); }
.dark h1.display, .dark h2.display, .dark h3.display, .dark .display { color: var(--paper-inv); }

/* Compressed caps labels */
.eyebrow {
  font-size: 10px;
  letter-spacing: .26em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--ink);
  display: inline-flex; align-items: center; gap: 12px;
}
.eyebrow::before {
  content: attr(data-idx);
  display: inline-block;
  min-width: 28px;
  padding: 3px 7px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-weight: 500;
  letter-spacing: .05em;
  font-size: 10px;
  text-align: center;
}
.eyebrow.amber-idx::before { background: var(--teal); color: var(--paper); }
.eyebrow.plain { gap: 10px; }
.eyebrow.plain::before { display: none; }
.teal .eyebrow { color: var(--teal-ink); }
.teal .eyebrow::before { background: rgba(232,228,222,.9); color: var(--teal); }
.amber .eyebrow { color: var(--paper); }
.amber .eyebrow::before { background: var(--paper); color: var(--amber); }
.dark .eyebrow { color: var(--paper-inv); }
.dark .eyebrow::before { background: var(--paper-inv); color: var(--ink); }

/* Lede / body */
.lede {
  font-size: clamp(18px, 1.4vw, 22px);
  line-height: 1.4;
  color: var(--ink);
  max-width: 54ch;
  font-weight: 400;
  letter-spacing: -.005em;
}
.body-text {
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-80);
  max-width: 60ch;
}
.body-text p + p { margin-top: 1em; }
.teal .body-text { color: rgba(232,228,222,.85); }
.teal em, .dark em { color: var(--mint); }
.teal .hl { color: var(--mint); }
.teal .lede { color: var(--teal-ink); }

/* Meta / tabular */
.meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-60);
}
.teal .meta { color: rgba(232,228,222,.55); }
.amber .meta { color: rgba(255,255,255,.8); }

/* Inline highlight */
.hl { color: var(--teal); font-weight: 500; }

/* ───────── RULES & DIVIDERS ───────────────────── */
.rule { height: 1px; background: var(--ink); border: 0; }
.rule-thin { height: 1px; background: var(--ink-15); border: 0; }
.rule-heavy { height: 2px; background: var(--ink); border: 0; }
.teal .rule-heavy { background: var(--teal-ink); }
.rule-amber { height: 2px; background: var(--teal); border: 0; }
.teal .rule { background: var(--teal-ink); }
.teal .rule-thin { background: rgba(232,228,222,.2); }

/* ───────── GRID ────────────────────────────────── */
.g-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: 24px; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px,4vw,72px); }
.cols-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: clamp(20px,2.5vw,40px); }
.cols-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: clamp(16px,2vw,32px); }
.cols-5 { display: grid; grid-template-columns: repeat(5,1fr); gap: 0; }
.cols-8-4 { display: grid; grid-template-columns: 2fr 1fr; gap: clamp(40px,5vw,80px); }

/* ───────── BUTTONS ─────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 24px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  font-weight: 500;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  font-family: var(--sans);
}
.btn:hover { background: var(--teal-dark); border-color: var(--teal-dark); color: var(--paper); }
.btn.amber { background: var(--teal); border-color: var(--teal); color: var(--paper); }
.btn.amber:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); }

.teal .btn { background: var(--teal-ink); border-color: var(--teal-ink); color: var(--teal); }
.teal .btn:hover { background: var(--mint); border-color: var(--mint); color: var(--teal); }
.teal .btn.ghost { background: transparent; color: var(--teal-ink); border-color: var(--teal-ink); }
.teal .btn.ghost:hover { background: var(--teal-ink); color: var(--teal); }

.link-arrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11px; letter-spacing: .22em; text-transform: uppercase;
  font-weight: 500; padding: 4px 0;
  border-bottom: 1px solid currentColor;
  transition: gap .2s, color .15s;
}
.link-arrow:hover { gap: 16px; color: var(--teal); }

/* ───────── TAG / PILL ──────────────────────────── */
.tag-pill {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  color: var(--ink);
}
.tag-pill.amber { border-color: var(--teal); color: var(--teal); }
.tag-pill.solid { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.tag-pill.solid-amber { background: var(--teal); color: var(--paper); border-color: var(--teal); }

/* ───────── STATS ───────────────────────────────── */
.stat { border-top: 2px solid var(--ink); padding-top: 14px; }
.stat .n {
  font-size: clamp(36px, 4.5vw, 64px);
  font-weight: 500;
  line-height: .92;
  letter-spacing: -.03em;
  font-feature-settings: "tnum";
}
.stat .l {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-60);
  margin-top: 10px;
  display: block;
  max-width: 18ch;
}
.stat.amber .n { color: var(--teal); }
.teal .stat { border-color: var(--teal-ink); }
.teal .stat .l { color: rgba(232,228,222,.6); }

/* ───────── SPEC LISTS ──────────────────────────── */
.specs { list-style: none; border-top: 1px solid var(--ink); }
.specs li {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ink-15);
  align-items: baseline;
}
.specs .idx {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-45);
  letter-spacing: .05em;
}
.specs .label { font-size: 16px; font-weight: 500; }
.specs .label em { display: block; margin-top: 3px; font-size: 12px; color: var(--ink-60); font-weight: 400; letter-spacing: 0; }
.specs .tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-60);
}
.teal .specs { border-color: var(--teal-ink); }
.teal .specs li { border-bottom-color: rgba(232,228,222,.18); }
.teal .specs .idx, .teal .specs .tag { color: rgba(232,228,222,.55); }
.teal .specs .label em { color: rgba(232,228,222,.6); }

/* ───────── LOGO AS GRAPHIC ─────────────────────── */
.logomark-xl {
  display: block;
  width: 100%;
  height: auto;
  opacity: 1;
  filter: none;
}
.logomark-xl.teal-tint { filter: brightness(0) saturate(100%) invert(26%) sepia(14%) saturate(1000%) hue-rotate(128deg) brightness(92%) contrast(88%); }
.logomark-xl.amber-tint { filter: brightness(0) saturate(100%) invert(26%) sepia(14%) saturate(1000%) hue-rotate(128deg) brightness(92%) contrast(88%); }
.logomark-xl.cream-tint { filter: brightness(0) saturate(100%) invert(91%) sepia(12%) saturate(280%) hue-rotate(8deg) brightness(96%); }

/* Watermark block (large behind text) */
.mark-bleed {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}

/* ───────── LOGO TEXT-INLINE TREATMENTS ──────────── */
.headline-mark { display: inline; }
.headline-mark img {
  height: .72em;
  width: auto;
  display: inline-block;
  vertical-align: -.06em;
  margin: 0 .14em 0 .04em;
}

/* Big "section number + mark" plate, Aicher piktogramm style */
.pikto {
  aspect-ratio: 1;
  background: var(--teal);
  color: var(--teal-ink);
  display: flex; flex-direction: column; justify-content: space-between;
  padding: clamp(14px,1.6vw,24px);
  position: relative;
}
.pikto.amber { background: var(--teal); color: var(--paper); }
.pikto.paper { background: var(--paper-2); color: var(--ink); }
.pikto .n {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.pikto .glyph {
  width: 60%;
  align-self: center; justify-self: center;
  margin: auto 0;
}
.pikto .glyph img { width: 100%; height: auto; display: block; }
.pikto .label {
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ───────── FOOTER ──────────────────────────────── */
footer.site {
  background: var(--teal);
  color: var(--teal-ink);
  padding: clamp(72px, 8vw, 120px) var(--gutter) 24px;
}
footer.site .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1fr;
  gap: 56px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(232,228,222,.2);
}
footer.site h5 {
  font-size: 10px; letter-spacing: .26em; text-transform: uppercase;
  font-weight: 500; margin-bottom: 18px;
  color: rgba(232,228,222,.55);
}
footer.site ul { list-style: none; }
footer.site li { margin-bottom: 8px; font-size: 14px; }
footer.site a:hover { color: var(--mint); }
footer.site .wordmark-big {
  display: flex; align-items: center; gap: 14px;
  font-size: 22px; letter-spacing: .22em; text-transform: uppercase;
  font-weight: 500; margin-bottom: 18px;
}
footer.site .wordmark-big img { height: 34px; }
footer.site .sig {
  max-width: var(--maxw);
  margin: 20px auto 0;
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono);
  font-size: 10px; letter-spacing: .16em; text-transform: uppercase;
  color: rgba(232,228,222,.5);
  gap: 24px; flex-wrap: wrap;
}

/* ───────── MEMORANDUM STRIP ────────────────────── */
.memo {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-60);
  display: inline-flex; flex-wrap: wrap;
  width: fit-content;
  gap: 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.memo span {
  padding: 10px 18px 10px 0;
  margin-right: 18px;
  border-right: 1px solid var(--ink-15);
  display: inline-flex; gap: 8px;
}
.memo span:last-child { border-right: 0; margin-right: 0; }
.memo b { font-weight: 500; color: var(--ink); }
.teal .memo { border-color: var(--teal-ink); color: rgba(232,228,222,.7); }
.teal .memo span { border-right-color: rgba(232,228,222,.2); }
.teal .memo b { color: var(--teal-ink); }

/* ───────── MISC ────────────────────────────────── */
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 12px; top: 12px; background: var(--teal); color: var(--paper); padding: 8px 12px; z-index: 100; }

/* Diagonal teal stripe used as divider */
.amber-strip {
  height: 6px;
  background: repeating-linear-gradient(-45deg, var(--teal) 0 12px, transparent 12px 24px);
  max-width: none;
}

/* ───────── ACCESSIBILITY ─────────────────────── */
:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ───────── LAYOUT GRID CLASSES ─────────────────── */
.hero-lede-row     { display: grid; grid-template-columns: 1.3fr 1fr; }
.hero-stats        { display: grid; grid-template-columns: repeat(3,1fr); }
.section-head-row  { display: grid; grid-template-columns: 1fr 2fr; }
.agenda-row        { display: grid; grid-template-columns: 120px 200px 1fr auto; }
.platform-row      { display: grid; grid-template-columns: 1.2fr 1fr; }
.platform-stats    { display: grid; grid-template-columns: 1fr 1fr; }
.cta-row           { display: grid; grid-template-columns: 1fr 1fr; }
.cta-contact       { display: grid; grid-template-columns: repeat(3,1fr); }
.founder-avatar    { display: grid; grid-template-columns: 96px 1fr; }
.rd-intro-row      { display: grid; grid-template-columns: 1fr 1fr; }
.arch-layer-row    { display: grid; grid-template-columns: 180px 1fr; }
.module-grid       { display: grid; grid-template-columns: 1fr 1fr; }
.rd-num-row        { display: grid; grid-template-columns: 120px 1fr; }
.stats-4           { display: grid; grid-template-columns: repeat(4,1fr); }
.founder-detail    { display: grid; grid-template-columns: 1fr 2fr; }

/* ───────── RESPONSIVE ─────────────────────────── */
@media (max-width: 920px) {
  .cols, .cols-3, .cols-4, .cols-5 { grid-template-columns: 1fr; }
  .cols-8-4 { grid-template-columns: 1fr; }
  .hero-lede-row,
  .section-head-row,
  .agenda-row,
  .platform-row,
  .cta-row,
  .rd-intro-row,
  .arch-layer-row,
  .module-grid,
  .rd-num-row,
  .stats-4,
  .founder-detail { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: var(--paper); border-bottom: 1px solid var(--ink); padding: 12px 0; }
  .nav-links.open li + li { border-left: 0; border-top: 1px solid var(--ink-15); }
  .nav-links.open a { padding: 14px var(--gutter); width: 100%; }
  .nav-toggle { display: block; }
  footer.site .inner { grid-template-columns: 1fr 1fr; }
  .g-12 { grid-template-columns: repeat(6,1fr); }
}

@media (max-width: 600px) {
  footer.site .inner { grid-template-columns: 1fr; }
  .g-12 { grid-template-columns: 1fr; }
  .hero-stats,
  .platform-stats,
  .cta-contact { grid-template-columns: 1fr; }
}