/* ============================================================
   ARKA — See The Unseen
   Design tokens derived from ARKA Brand Guidelines (2017, V1.0)
   and Re:Emerge (2025). Colors, geometry and type are immutable.
   ============================================================ */

:root {
  /* Color — guideline p.24 */
  --arka-red: #C13127;
  --arka-burgundy: #781214;
  --ink: #0A0A0A;
  --paper: #FFFFFF;
  --paper-warm: #FAF8F7;
  --line: rgba(10, 10, 10, 0.14);
  --line-soft: rgba(10, 10, 10, 0.08);
  --muted: rgba(10, 10, 10, 0.62);
  --dark-surface: #0D0B0B;
  --dark-text: rgba(255, 255, 255, 0.92);
  --dark-muted: rgba(255, 255, 255, 0.64);
  --dark-line: rgba(255, 255, 255, 0.16);

  /* Type — Proxima Nova / Blender Pro with faithful fallbacks */
  --font-sans: "proxima-nova", "Proxima Nova", "Mulish", "Helvetica Neue", Arial, sans-serif;
  --font-tech: "Blender Pro", "Chakra Petch", "Mulish", monospace, sans-serif;

  /* Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
  --text-title: clamp(2rem, 1.2rem + 3.4vw, 4rem);
  --text-display: clamp(3rem, 1.4rem + 9.5vw, 10.5rem);

  /* Rhythm */
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --section-gap: clamp(5rem, 12vh, 10rem);
  --max-w: 84rem;

  /* Geometry — 45° is the brand angle (guideline p.14) */
  --notch: 0.75rem;

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 180ms;
  --dur: 320ms;
  --dur-slow: 640ms;

  /* Layers */
  --z-header: 100;
  --z-menu: 200;
  --z-progress: 300;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: clip; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}
h1, h2, h3, h4, p, ul { margin: 0; }
ul { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
img, svg, canvas { display: block; max-width: 100%; }
::selection { background: var(--arka-red); color: #fff; }

:focus-visible {
  outline: 2px solid var(--arka-red);
  outline-offset: 3px;
}
.section--dark :focus-visible,
.contact :focus-visible,
.site-footer :focus-visible { outline-color: #fff; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}
.skip-link {
  position: fixed; top: -100%; left: var(--gutter); z-index: calc(var(--z-progress) + 1);
  background: var(--ink); color: #fff; padding: 0.75rem 1.25rem;
  font-family: var(--font-tech); font-size: var(--text-sm); text-transform: uppercase;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus { top: 0; }

/* ---------- Shared vocabulary ---------- */

.kicker {
  font-family: var(--font-tech);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}
.kicker--light { color: rgba(255, 255, 255, 0.8); }

/* Buttons — 45° clipped corner: the brand angle as an affordance */
.btn {
  display: inline-flex;
  align-items: center;
  min-height: 3rem;
  padding: 0.8rem 1.75rem;
  font-family: var(--font-tech);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  clip-path: polygon(0 0, calc(100% - var(--notch)) 0, 100% var(--notch), 100% 100%, 0 100%);
  transition: background-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  cursor: pointer;
}
.btn:active { transform: scale(0.97); }
.btn--red { background: var(--arka-red); color: #fff; }
.btn--red:hover { background: var(--arka-burgundy); }
.btn--white { background: #fff; color: var(--arka-red); }
.btn--white:hover { background: var(--ink); color: #fff; }
.btn--ghost {
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}
.btn--ghost:hover { box-shadow: inset 0 0 0 1px var(--ink); }
.btn--ghost-light {
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.4);
}
.btn--ghost-light:hover { background: #fff; color: var(--ink); box-shadow: none; }

/* Section header — the guideline's own page-header language:
   number, label, red keyline with a 45° notched end (guideline pp.14–33) */
.section {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-gap) var(--gutter);
}
.section__head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: clamp(2.5rem, 6vh, 4.5rem);
}
.section__no {
  font-family: var(--font-tech);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--arka-red);
  letter-spacing: 0.1em;
}
.section__label {
  font-family: var(--font-tech);
  font-weight: 500;
  font-size: var(--text-sm);
  letter-spacing: 0.28em;
  text-transform: uppercase;
}
.section__head--dark .section__label { color: var(--dark-text); }
.section__head--dark .section__no,
.section--dark .step__no { color: #E05448; } /* Arka Red, tonally lifted for dark surfaces */
.section__rule {
  flex: 1;
  align-self: center;
  height: 10px;
  position: relative;
}
.section__rule::before {
  content: "";
  position: absolute;
  left: 0; right: 9px; top: 50%;
  border-top: 1px solid var(--arka-red);
}
.section__rule::after {
  /* 45° downturn at the end of the rule — lifted from the guideline pages */
  content: "";
  position: absolute;
  right: 0; top: 50%;
  width: 12px;
  border-top: 1px solid var(--arka-red);
  transform: rotate(45deg);
  transform-origin: left top;
}

.section__title {
  font-weight: 800;
  font-size: var(--text-title);
  line-height: 1.04;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  max-width: 18ch;
}
.section__intro {
  max-width: 44rem;
  margin-top: 1.75rem;
  font-size: var(--text-lg);
  font-weight: 300;
  line-height: 1.65;
  color: var(--muted);
}
.section__intro--dark { color: var(--dark-muted); }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0 var(--gutter);
  height: 4.5rem;
  background: rgba(255, 255, 255, 0);
  transition: background-color var(--dur) var(--ease-out), box-shadow var(--dur) var(--ease-out);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line-soft);
}
.brand { display: block; flex-shrink: 0; }
.brand__lockup { height: 1.75rem; width: auto; }
.brand__mark path { fill: var(--arka-red); }
.brand__word path { fill: var(--ink); transition: fill var(--dur) var(--ease-out); }

.site-nav { margin-left: auto; }
.site-nav ul { display: flex; gap: clamp(1rem, 2.5vw, 2.25rem); }
.site-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0;
  font-family: var(--font-tech);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  white-space: nowrap;
  position: relative;
}
.site-nav__no { color: var(--arka-red); font-weight: 600; }
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--arka-red);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur) var(--ease-out);
}
.site-nav a:hover::after,
.site-nav a[aria-current="true"]::after { transform: scaleX(1); transform-origin: left; }

.header-cta { flex-shrink: 0; min-height: 2.5rem; padding: 0.5rem 1.25rem; }

/* Language switch */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  font-family: var(--font-tech);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
}
.lang-switch span { color: var(--line); }
.lang-switch a { padding: 0.5rem 0.1rem; color: var(--muted); transition: color var(--dur-fast); }
.lang-switch a:hover { color: var(--arka-red); }
.lang-switch a[aria-current="true"] { color: var(--ink); font-weight: 600; }

.mobile-menu a.mobile-menu__lang {
  margin-top: 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  opacity: 0.85;
}
.site-footer__lang a { color: var(--dark-muted); }
.site-footer__lang a:hover { color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  width: 44px; height: 44px;
  margin-left: auto;
}
.nav-toggle span {
  display: block;
  height: 2px; width: 26px;
  margin: 0 auto;
  background: var(--ink);
  transition: transform var(--dur) var(--ease-out), opacity var(--dur) var(--ease-out), background-color var(--dur);
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4.5px) rotate(45deg); background: #fff; }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4.5px) rotate(-45deg); background: #fff; }

/* Mobile menu — full red field with the optical pattern (Re:Emerge cover) */
.mobile-menu[hidden] { display: none; }
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-menu);
  background: var(--arka-red);
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity var(--dur) var(--ease-out);
}
.mobile-menu.is-open { opacity: 1; }
.mobile-menu__pattern { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }
.mobile-menu nav {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  width: 100%;
  max-width: 30rem;
  padding: 0 clamp(1.5rem, 7vw, 3rem);
}
.mobile-menu a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  color: #fff;
  font-weight: 800;
  font-size: clamp(1.75rem, 8vw, 3rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  padding: 0.5rem 0;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.mobile-menu.is-open a { opacity: 1; transform: none; }
.mobile-menu a span {
  font-family: var(--font-tech);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.2em;
  opacity: 0.75;
}
.mobile-menu nav a.mobile-menu__cta { color: var(--ink); }

/* When menu is open, header sits above it with white logo */
body.menu-open .site-header { background: transparent; box-shadow: none; }
body.menu-open .site-header { z-index: calc(var(--z-menu) + 1); }
body.menu-open .brand__mark path,
body.menu-open .brand__word path { fill: #fff; }
body.menu-open .header-cta { visibility: hidden; }

/* Scroll progress — a thin red edge that grows as you look deeper */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: var(--z-progress);
  pointer-events: none;
}
.scroll-progress i {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--arka-red);
  transform: scaleX(0);
  transform-origin: left;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 7rem var(--gutter) 4.5rem;
  overflow: hidden;
}
.hero__pattern {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.hero__inner {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}
.hero .kicker { display: block; margin-bottom: 1.25rem; }
.hero__title {
  font-size: var(--text-display);
  font-weight: 800;
  line-height: 0.94;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}
.hero__line { display: block; overflow: hidden; }
.hero__line > span { display: inline-block; }

/* UNSEEN — outlined until the visitor looks closer (JS paints the reveal) */
.hero__line--unseen > span {
  color: transparent;
  -webkit-text-stroke: 1.5px var(--ink);
  position: relative;
}

.hero__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-top: clamp(2rem, 5vh, 3.5rem);
}
.hero__lede {
  max-width: 34rem;
  font-size: var(--text-lg);
  font-weight: 300;
  line-height: 1.65;
  color: var(--muted);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.hero__scrollhint {
  position: absolute;
  right: var(--gutter);
  bottom: 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-tech);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero__scrollhint svg { width: 11px; height: 13px; animation: nudge 2.4s var(--ease-out) infinite; }
@keyframes nudge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

/* ---------- 01 Philosophy ---------- */
.manifesto { max-width: 56rem; }
.manifesto__line {
  font-size: clamp(1.6rem, 1rem + 2.6vw, 3.25rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.005em;
}
.manifesto__line em { font-style: normal; color: var(--arka-red); }
.manifesto__line--red { color: var(--arka-red); margin-top: 1.5rem; }
.manifesto__line + .manifesto__line { margin-top: 0.35rem; }

.philosophy__body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
  gap: clamp(1.5rem, 4vw, 4rem);
  margin-top: clamp(2.5rem, 7vh, 5rem);
  max-width: 62rem;
}
.philosophy__col p { color: var(--muted); font-weight: 300; font-size: var(--text-lg); line-height: 1.7; }
.philosophy__col p + p { margin-top: 1.25rem; }
.philosophy__note {
  position: relative;
  padding-left: 1.6rem;
}
.philosophy__note strong { color: var(--arka-red); font-weight: 700; }
/* parallelogram tick — the 45° brand angle as punctuation */
.q-mark {
  position: absolute;
  left: 0; top: 0.62em;
  width: 14px; height: 8px;
  background: var(--arka-red);
  transform: skewX(-45deg);
}

/* ---------- 02 Approach ---------- */
.steps {
  position: relative;
  margin-top: clamp(3rem, 8vh, 5.5rem);
  padding-left: clamp(1.75rem, 4vw, 3rem);
}
.steps__path {
  position: absolute;
  left: 5px; top: 0.5rem; bottom: 0.5rem;
  width: 2px;
  height: calc(100% - 1rem);
  color: var(--line);
}
.steps__path path {
  stroke-dasharray: 100;
  stroke-dashoffset: 100;
  color: var(--arka-red);
  transition: stroke-dashoffset 1.2s var(--ease-out);
}
.steps.is-drawn .steps__path path { stroke-dashoffset: 0; }

.step {
  position: relative;
  display: grid;
  grid-template-columns: minmax(12rem, 20rem) 1fr;
  gap: clamp(1.25rem, 3vw, 3.5rem);
  padding: clamp(1.75rem, 4vh, 3rem) 0;
}
.step + .step { border-top: 1px solid var(--line-soft); }
.step__marker {
  position: absolute;
  left: calc(-1 * clamp(1.75rem, 4vw, 3rem) - 1px);
  top: calc(clamp(1.75rem, 4vh, 3rem) + 0.55rem);
}
.step__marker i {
  display: block;
  width: 13px; height: 7px;
  background: var(--arka-red);
  transform: skewX(-45deg) translateX(2px);
}
.step__no {
  display: block;
  font-family: var(--font-tech);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  color: var(--arka-red);
  margin-bottom: 0.4rem;
}
.step__head h4 {
  font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.4rem);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.05;
}
.step__body p { color: var(--muted); font-weight: 300; line-height: 1.7; max-width: 38rem; }
.step__outcome {
  margin-top: 1.1rem;
  font-weight: 400;
  color: var(--ink) !important;
}
.step__outcome span {
  display: block;
  font-family: var(--font-tech);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--arka-red);
  margin-bottom: 0.25rem;
}
.approach__coda {
  margin-top: clamp(2.5rem, 6vh, 4rem);
  max-width: 40rem;
  font-size: var(--text-lg);
  font-weight: 400;
  border-left: 2px solid var(--arka-red);
  padding-left: 1.5rem;
}

/* ---------- 03 Ecosystem ---------- */
.capabilities {
  margin-top: clamp(2.5rem, 7vh, 4.5rem);
  border-top: 1px solid var(--line);
}
.capability { border-bottom: 1px solid var(--line); }
.capability__row {
  display: grid;
  grid-template-columns: 3.5rem minmax(12rem, 1fr) 2fr 2.5rem;
  align-items: baseline;
  gap: 1rem;
  width: 100%;
  padding: 1.35rem 0;
  text-align: left;
  transition: color var(--dur-fast) var(--ease-out);
}
.capability__no {
  font-family: var(--font-tech);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--arka-red);
}
.capability__name {
  font-size: clamp(1.15rem, 1rem + 1vw, 1.7rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  line-height: 1.15;
}
.capability__serves {
  font-weight: 300;
  color: var(--muted);
  font-size: var(--text-base);
}
.capability__toggle {
  position: relative;
  justify-self: end;
  align-self: center;
  width: 15px; height: 15px;
}
.capability__toggle::before,
.capability__toggle::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  background: var(--arka-red);
  transition: transform var(--dur) var(--ease-out);
}
.capability__toggle::before { width: 15px; height: 1.5px; }
.capability__toggle::after { width: 1.5px; height: 15px; }
.capability__row[aria-expanded="true"] .capability__toggle::after { transform: rotate(90deg); }
.capability__row:hover .capability__name { color: var(--arka-red); }

.capability__why {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--dur-slow) var(--ease-out);
}
.capability__why > p {
  overflow: hidden;
  min-height: 0;
  max-width: 44rem;
  margin-left: 4.5rem;
  color: var(--muted);
  font-weight: 300;
  line-height: 1.7;
}
.capability.is-open .capability__why { grid-template-rows: 1fr; }
.capability.is-open .capability__why > p { padding-bottom: 1.6rem; }

/* ---------- 04 Network ---------- */
.section--dark {
  max-width: none;
  background: var(--dark-surface);
  color: var(--dark-text);
  padding: 0;
}
.network__canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.network__content {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-gap) var(--gutter);
  pointer-events: none;                 /* let the canvas feel the pointer */
}
.network__content a, .network__content button, .network__content summary { pointer-events: auto; }
.section--dark .section__intro { color: var(--dark-muted); }
.network__hint {
  margin-top: 1.5rem;
  font-family: var(--font-tech);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
}
.network__split {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: clamp(1.5rem, 4vw, 4rem);
  margin-top: clamp(14rem, 34vh, 22rem); /* space for the constellation to breathe */
  max-width: 62rem;
}
.network__side-label {
  font-family: var(--font-tech);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--arka-red);
  margin-bottom: 0.9rem;
  filter: brightness(1.35); /* keep the red legible on near-black */
}
.network__side p { color: var(--dark-muted); font-weight: 300; line-height: 1.7; }
.network__side .btn { margin-top: 1.4rem; }

/* ---------- 05 Answers ---------- */
.answers {
  margin-top: clamp(2.5rem, 7vh, 4.5rem);
  border-top: 1px solid var(--line);
  max-width: 56rem;
}
.answer { border-bottom: 1px solid var(--line); }
.answer summary {
  display: flex;
  align-items: baseline;
  gap: 1.1rem;
  list-style: none;
  cursor: pointer;
  padding: 1.4rem 0;
  font-size: clamp(1.05rem, 1rem + 0.7vw, 1.45rem);
  font-weight: 700;
  transition: color var(--dur-fast) var(--ease-out);
}
.answer summary::-webkit-details-marker { display: none; }
.answer summary:hover { color: var(--arka-red); }
.answer__marker {
  flex-shrink: 0;
  width: 13px; height: 7px;
  background: var(--arka-red);
  transform: skewX(-45deg);
  transition: transform var(--dur) var(--ease-out);
}
.answer[open] .answer__marker { transform: skewX(-45deg) scaleX(1.6); }
.answer__body { padding: 0 0 1.6rem 2.05rem; }
.answer__body p { color: var(--muted); font-weight: 300; line-height: 1.7; max-width: 44rem; }

/* ---------- 06 Contact ---------- */
.contact {
  position: relative;
  background: var(--arka-red);
  color: #fff;
  overflow: hidden;
}
.contact__pattern {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.55;
}
.contact__inner {
  position: relative;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--section-gap) var(--gutter);
}
.contact__title {
  margin-top: 1.25rem;
  font-size: var(--text-title);
  font-weight: 800;
  text-transform: uppercase;
  line-height: 1.04;
  letter-spacing: 0.01em;
}
.contact__lede {
  max-width: 38rem;
  margin-top: 1.75rem;
  font-size: var(--text-lg);
  font-weight: 300;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.88);
}
.contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}
.contact__address {
  margin-top: 3rem;
  font-family: var(--font-tech);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.75);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: var(--dark-text);
  padding: clamp(3.5rem, 8vh, 6rem) var(--gutter) 2rem;
}
.site-footer__top,
.site-footer__grid,
.site-footer__base {
  max-width: var(--max-w);
  margin: 0 auto;
}
.site-footer__lockup { height: 2.6rem; width: auto; }
.site-footer__tag {
  margin-top: 1.1rem;
  font-family: var(--font-tech);
  font-size: var(--text-sm);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--dark-muted);
}
.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 2rem;
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--dark-line);
}
.site-footer__grid nav { display: flex; flex-direction: column; gap: 0.6rem; }
.site-footer__grid nav a,
.site-footer__meta a {
  color: var(--dark-muted);
  font-size: var(--text-sm);
  transition: color var(--dur-fast);
}
.site-footer__grid nav a:hover, .site-footer__meta a:hover { color: #fff; }
.site-footer__meta p { color: var(--dark-muted); font-size: var(--text-sm); line-height: 1.7; }
.site-footer__meta em { color: #fff; font-style: italic; }
.site-footer__base {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--dark-line);
}
.site-footer__base p {
  font-family: var(--font-tech);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
}

/* ---------- Reveal system ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.is-in { opacity: 1; transform: none; }

.reveal-line {
  opacity: 0;
  transform: translateY(1.2em);
  clip-path: inset(0 0 100% 0);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out), clip-path 0.7s var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal-line.is-in { opacity: 1; transform: none; clip-path: inset(-0.2em 0 -0.2em 0); }

/* Hero title lines rise inside their masks */
.hero__line > span {
  transform: translateY(110%);
  transition: transform 0.9s var(--ease-out);
}
.reveal.is-in > span, .hero__line.is-in > span { transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .site-nav, .header-cta, .lang-switch { display: none; }
  .nav-toggle { display: flex; }
  .step { grid-template-columns: 1fr; gap: 0.9rem; }
  .capability__row { grid-template-columns: 2.5rem 1fr 2rem; }
  .capability__serves { display: none; }
  .capability__why > p { margin-left: 3.5rem; }
  .network__split { margin-top: clamp(10rem, 30vh, 16rem); }
}
@media (max-width: 560px) {
  .hero { padding-bottom: 5.5rem; }
  .hero__scrollhint { display: none; }
  .capability__why > p { margin-left: 0; }
  .answer__body { padding-left: 0; }
}

/* ---------- Japanese edition ----------
   Same identity, tuned metrics: CJK needs looser leading, no
   letter-spacing tricks, and denser display sizes. Latin keeps
   Mulish/Chakra; kana and kanji fall through to Noto Sans JP. */
html[lang="ja"] body { line-height: 1.8; }
html[lang="ja"] {
  --font-sans: "proxima-nova", "Proxima Nova", "Mulish", "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  --font-tech: "Blender Pro", "Chakra Petch", "Noto Sans JP", sans-serif;
  --text-title: clamp(1.8rem, 1.1rem + 3vw, 3.4rem);
}
html[lang="ja"] .section__title,
html[lang="ja"] .contact__title { letter-spacing: 0.04em; line-height: 1.22; max-width: 24ch; }
html[lang="ja"] .manifesto__line { line-height: 1.4; font-size: clamp(1.4rem, 1rem + 2.2vw, 2.7rem); }
html[lang="ja"] .step__head h4 { letter-spacing: 0.04em; }
html[lang="ja"] .capability__name { letter-spacing: 0.04em; font-size: clamp(1.05rem, 1rem + 0.8vw, 1.45rem); }
html[lang="ja"] .hero__lede,
html[lang="ja"] .section__intro,
html[lang="ja"] .step__body p,
html[lang="ja"] .philosophy__col p,
html[lang="ja"] .answer__body p,
html[lang="ja"] .network__side p,
html[lang="ja"] .contact__lede { line-height: 1.95; }
html[lang="ja"] .answer summary { line-height: 1.5; }
html[lang="ja"] .kicker { letter-spacing: 0.14em; }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal, .reveal-line, .hero__line > span {
    opacity: 1 !important;
    transform: none !important;
    clip-path: none !important;
  }
  .steps__path path { stroke-dashoffset: 0; }
}