:root {
  --ink: #0a1512;
  --ink-2: #0e1d18;
  --ink-3: #12251e;
  --paper: #f0ebe0;
  --paper-2: #e7dfd0;
  --emerald: #12a67c;
  --emerald-bright: #22d69c;
  --emerald-deep: #064e3b;
  --brass: #c0943e;
  --brass-light: #dcb56c;
  --on-ink: #f0ebe0;
  --on-paper: #0a1512;
  --mut-ink: rgba(240, 235, 224, 0.6);
  --mut-paper: rgba(10, 21, 18, 0.58);
  --line-ink: rgba(240, 235, 224, 0.14);
  --line-paper: rgba(10, 21, 18, 0.14);
  --display: "Fraunces", Georgia, serif;
  --body: "Hanken Grotesk", system-ui, sans-serif;
  --mono: "Space Mono", ui-monospace, monospace;
  --wrap: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body);
  background: var(--ink);
  color: var(--on-ink);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

.sec {
  padding: clamp(72px, 10vw, 140px) 0;
}

.ink {
  background: var(--ink);
  color: var(--on-ink);
}

.paper {
  background:
    radial-gradient(ellipse 80% 50% at 10% 0%, rgba(18, 166, 124, 0.08), transparent 55%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%);
  color: var(--on-paper);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--emerald);
  display: inline-flex;
  gap: 10px;
  align-items: center;
}

.paper .eyebrow {
  color: var(--emerald-deep);
}

.eyebrow::before {
  content: "改";
  font-family: var(--display);
  font-size: 15px;
  color: var(--brass);
  line-height: 1;
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 560;
  line-height: 1.04;
  letter-spacing: -0.015em;
}

.display-xl {
  font-size: clamp(38px, 6.4vw, 80px);
}

.display-l {
  font-size: clamp(30px, 4.6vw, 54px);
}

.display-m {
  font-size: clamp(23px, 2.8vw, 32px);
  font-weight: 620;
}

.lead {
  font-size: clamp(17px, 1.5vw, 20px);
  color: var(--mut-ink);
  max-width: 60ch;
}

.paper .lead {
  color: var(--mut-paper);
}

/* ---------- NAV ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
}

.nav-bar {
  background: rgba(10, 21, 18, 0.94);
  border-bottom: 1px solid var(--line-ink);
}

.site-header.is-open .nav-bar {
  background: transparent;
  border-bottom-color: transparent;
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
  position: relative;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--display);
  font-size: 22px;
  font-weight: 620;
  letter-spacing: -0.02em;
  z-index: 2;
}

.brand .kmark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 1px solid var(--emerald);
  border-radius: 50%;
  color: var(--brass);
  font-size: 16px;
  flex: none;
}

.nav-links {
  display: flex;
  gap: 30px;
  align-items: center;
}

.nav-links a:not(.btn) {
  font-size: 14px;
  color: var(--mut-ink);
  transition: color 0.2s;
}

.nav-links a:not(.btn):hover,
.nav-links a:not(.btn):focus-visible {
  color: var(--on-ink);
}

.lang {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mut-ink);
  display: inline-flex;
  gap: 0.35em;
  align-items: center;
}

.lang button {
  color: inherit;
  letter-spacing: inherit;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.lang button:hover,
.lang button:focus-visible {
  color: var(--on-ink);
}

.lang button[aria-current="true"] {
  color: var(--emerald-bright);
  border-bottom-color: var(--emerald-bright);
}

.btn {
  font-family: var(--body);
  font-weight: 600;
  font-size: 14px;
  padding: 11px 20px;
  border-radius: 100px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-block;
  transition: transform 0.18s ease, background 0.2s, border-color 0.2s;
}

.btn-solid {
  background: var(--emerald);
  color: #04120c;
}

.btn-solid:hover,
.btn-solid:focus-visible {
  background: var(--emerald-bright);
  transform: translateY(-2px);
}

.btn-ghost {
  border-color: var(--line-ink);
  color: var(--on-ink);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--emerald);
  transform: translateY(-2px);
}

.btn-brass {
  background: var(--brass);
  color: #1b1206;
}

.btn-brass:hover,
.btn-brass:focus-visible {
  background: var(--brass-light);
  transform: translateY(-2px);
}

.nav-links .btn {
  padding: 9px 18px;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid var(--line-ink);
  border-radius: 50%;
  z-index: 2;
}

.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--on-ink);
  position: relative;
  transition: transform 0.25s ease, opacity 0.2s;
}

.menu-toggle span::before,
.menu-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.menu-toggle span::before {
  top: -6px;
}

.menu-toggle span::after {
  top: 6px;
}

.menu-toggle[aria-expanded="true"] span {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] span::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: calc(100svh - 68px);
  display: flex;
  align-items: center;
  padding: clamp(48px, 7vw, 88px) 0 clamp(64px, 8vw, 110px);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 55% at 78% 35%, rgba(34, 214, 156, 0.16), transparent 60%),
    radial-gradient(ellipse 45% 40% at 12% 85%, rgba(192, 148, 62, 0.1), transparent 55%),
    linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 55%, #0b1a15 100%);
}

.hero-grain {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
  width: 100%;
}

.brand-hero {
  font-family: var(--display);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 620;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.brand-hero .kmark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--emerald);
  border-radius: 50%;
  color: var(--brass);
  font-size: 18px;
}

.hero h1 {
  margin: 0 0 24px;
}

.hero .em {
  font-style: italic;
  font-weight: 480;
  color: var(--brass-light);
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 34px;
}

.hero-note {
  margin-top: 26px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--mut-ink);
  border-left: 2px solid var(--brass);
  padding-left: 14px;
}

.ring-wrap {
  display: grid;
  place-items: center;
  position: relative;
}

.ring-wrap::before {
  content: "";
  position: absolute;
  width: min(100%, 480px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 214, 156, 0.12), transparent 68%);
  animation: pulse-glow 6s ease-in-out infinite;
}

svg.ring {
  width: 100%;
  max-width: 440px;
  height: auto;
  position: relative;
}

.ring-spin {
  transform-origin: 200px 200px;
  animation: spin 14s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse-glow {
  0%,
  100% {
    opacity: 0.65;
    transform: scale(0.96);
  }
  50% {
    opacity: 1;
    transform: scale(1.04);
  }
}

.node-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  fill: var(--mut-ink);
  text-transform: uppercase;
}

html[data-lang="it"] .node-label,
html[data-lang="es"] .node-label {
  font-size: 9px;
  letter-spacing: 0.04em;
}

.node-label.hot {
  fill: var(--brass-light);
}

.kanji-big {
  font-family: var(--display);
  font-size: 82px;
  fill: var(--on-ink);
}

.kanji-sub {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  fill: var(--emerald-bright);
}

/* ---------- PROVING GROUND ---------- */
.prov-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: end;
  margin-bottom: 52px;
}

.prov-head h2 {
  margin-top: 18px;
}

.vent-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line-paper);
  border: 1px solid var(--line-paper);
}

.vent {
  padding: 26px 22px;
  background: rgba(240, 235, 224, 0.92);
  transition: background 0.25s ease, transform 0.25s ease;
  position: relative;
}

.vent:hover {
  background: #fff;
  transform: translateY(-2px);
  z-index: 1;
  box-shadow: 0 18px 40px rgba(10, 21, 18, 0.08);
}

.vent .code {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mut-paper);
}

.vent h3 {
  font-family: var(--display);
  font-size: 22px;
  font-weight: 620;
  margin: 12px 0 6px;
}

.vent .sector {
  font-size: 13.5px;
  color: var(--mut-paper);
}

.tag {
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 9px;
  border: 1px solid var(--brass);
  color: var(--brass);
}

.vent .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--emerald);
  display: inline-block;
  margin-right: 7px;
  vertical-align: middle;
}

/* ---------- LOOP ---------- */
.loop-head {
  max-width: 64ch;
  margin-bottom: 56px;
}

.loop-head h2 {
  margin: 20px 0;
}

.stages {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  border-top: 1px solid var(--line-ink);
}

.stage {
  padding: 26px 20px 30px;
  border-right: 1px solid var(--line-ink);
  position: relative;
}

.stage:last-child {
  border-right: none;
}

.stage .n {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--emerald-bright);
}

.stage h3 {
  font-family: var(--display);
  font-size: 20px;
  font-weight: 620;
  margin: 14px 0 10px;
}

.stage p {
  font-size: 13.5px;
  color: var(--mut-ink);
  line-height: 1.5;
}

.stage.hot {
  background: linear-gradient(180deg, rgba(192, 148, 62, 0.12), transparent);
}

.stage.hot .n,
.stage.hot h3 {
  color: var(--brass-light);
}

/* ---------- AUTOMATE ---------- */
.auto-head {
  max-width: 60ch;
  margin-bottom: 52px;
}

.auto-head h2 {
  margin-top: 18px;
}

.services {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0 36px;
  border-top: 1px solid var(--line-paper);
}

.service {
  padding: 28px 0 32px;
  border-bottom: 1px solid var(--line-paper);
  transition: transform 0.2s ease;
}

.service:hover {
  transform: translateX(4px);
}

.service .ic {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--emerald-deep);
  margin-bottom: 16px;
}

.service h3 {
  font-family: var(--display);
  font-size: 21px;
  font-weight: 620;
  margin-bottom: 9px;
}

.service p {
  font-size: 14.5px;
  color: var(--mut-paper);
  line-height: 1.55;
}

/* ---------- STATS ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  border-top: 1px solid var(--line-ink);
  border-bottom: 1px solid var(--line-ink);
  padding: 44px 0;
}

.stat .big {
  font-family: var(--display);
  font-size: clamp(40px, 5vw, 62px);
  font-weight: 560;
  line-height: 1;
  color: var(--on-ink);
}

.stat .big .u {
  color: var(--brass);
  font-size: 0.5em;
  vertical-align: super;
}

.stat .lab {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mut-ink);
  margin-top: 12px;
}

/* ---------- CTA ---------- */
.cta {
  background:
    radial-gradient(circle at 50% 120%, rgba(34, 214, 156, 0.18), transparent 55%),
    linear-gradient(135deg, var(--ink-2), var(--ink-3));
  border: 1px solid var(--line-ink);
  padding: clamp(40px, 6vw, 72px);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta h2 {
  margin-bottom: 18px;
  position: relative;
}

.cta .lead {
  margin: 0 auto 30px;
  position: relative;
}

.cta-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  position: relative;
}

.contact {
  margin-top: 30px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mut-ink);
  position: relative;
}

.contact a {
  color: var(--emerald-bright);
}

.contact a:hover,
.contact a:focus-visible {
  text-decoration: underline;
}

/* ---------- FOOTER ---------- */
footer {
  border-top: 1px solid var(--line-ink);
  padding: 48px 0 40px;
}

.foot {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  align-items: flex-start;
}

.foot .brand {
  margin-bottom: 14px;
}

.foot p {
  font-size: 13px;
  color: var(--mut-ink);
  max-width: 34ch;
}

.foot-links {
  display: flex;
  gap: 56px;
  flex-wrap: wrap;
}

.foot-col h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mut-ink);
  margin-bottom: 14px;
  font-weight: 400;
}

.foot-col a,
.foot-col .lang-link {
  display: block;
  font-size: 14px;
  color: var(--on-ink);
  opacity: 0.8;
  margin-bottom: 9px;
  transition: opacity 0.2s, color 0.2s;
  text-align: left;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.foot-col a:hover,
.foot-col a:focus-visible,
.foot-col .lang-link:hover,
.foot-col .lang-link:focus-visible {
  opacity: 1;
  color: var(--emerald-bright);
}

.foot-col .lang-link[aria-current="true"] {
  opacity: 1;
  color: var(--emerald-bright);
}

.foot-bottom {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--line-ink);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--mut-ink);
}

/* reveal */
.rv {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.7s cubic-bezier(0.2, 0.7, 0.2, 1),
    transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.rv.in {
  opacity: 1;
  transform: none;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 900px) {
  .menu-toggle {
    display: grid;
  }

  .nav-links {
    position: fixed;
    inset: 0;
    z-index: 70;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 28px;
    padding: 88px 28px 40px;
    background: #0a1512;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.25s ease, visibility 0.25s;
  }

  .nav-links.open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-links a:not(.btn) {
    font-family: var(--display);
    font-size: 28px;
    color: var(--on-ink);
  }

  .site-header.is-open .brand,
  .site-header.is-open .menu-toggle {
    position: relative;
    z-index: 80;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .ring-wrap {
    order: -1;
    max-width: 380px;
    margin: 0 auto;
  }

  .prov-head {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .vent-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stages {
    grid-template-columns: repeat(2, 1fr);
  }

  .stage {
    border-bottom: 1px solid var(--line-ink);
  }

  .stage:nth-child(2n) {
    border-right: none;
  }

  .services {
    grid-template-columns: 1fr 1fr;
    gap: 0 28px;
  }

  .stats {
    grid-template-columns: 1fr 1fr;
    gap: 36px 28px;
  }
}

@media (max-width: 560px) {
  .vent-grid,
  .services,
  .stats {
    grid-template-columns: 1fr;
  }

  .stages {
    grid-template-columns: 1fr;
  }

  .stage {
    border-right: none;
  }

  .display-xl {
    font-size: 34px;
  }

  .foot-links {
    gap: 34px;
  }

  .wrap {
    padding: 0 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ring-spin,
  .ring-wrap::before {
    animation: none;
  }

  .rv {
    transition: none;
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }

  .btn:hover,
  .vent:hover,
  .service:hover {
    transform: none;
  }
}