@font-face {
  font-family: "Neue Power";
  src: url("./assets/NeuePower-Heavy.woff2") format("woff2");
  font-display: swap;
  font-weight: 800;
}

@font-face {
  font-family: "Instrument Sans";
  src: url("./assets/InstrumentSans-Regular.woff2") format("woff2");
  font-display: swap;
  font-weight: 400;
}

@font-face {
  font-family: "Instrument Sans";
  src: url("./assets/InstrumentSans-SemiBold.woff2") format("woff2");
  font-display: swap;
  font-weight: 600;
}

:root {
  --ink: #11110f;
  --paper: #f8f8f5;
  --accent: #d6cfb2;
  --navy: #07162f;
  --radius: 999px;
  --header-x: clamp(22px, 3.2vw, 60px);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Instrument Sans", Arial, sans-serif;
  background: var(--paper);
}

button, summary { font: inherit; }
a { color: inherit; text-decoration: none; }

.site-header {
  position: fixed;
  top: clamp(18px, 3vw, 42px);
  left: var(--header-x);
  right: var(--header-x);
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 58px;
  color: var(--ink);
  font-size: 15px;
  transition: top 500ms cubic-bezier(0.16, 1, 0.3, 1), color 340ms ease;
}

.site-header.is-compact { top: 16px; }
.site-header.is-light { color: #f8f8f5; }
.site-header.is-dark { color: var(--ink); }

.brand {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 600;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand__mark { position: relative; width: 31px; height: 22px; }
.brand__eye {
  position: absolute;
  inset: 0;
  width: 31px;
  height: 22px;
  object-fit: contain;
  transform: scale(1.42);
  transition: opacity 300ms ease;
}
.site-header.is-light .brand__eye--dark,
.site-header.is-dark .brand__eye--light { opacity: 0; }
.site-header.is-light .brand__eye--light,
.site-header.is-dark .brand__eye--dark { opacity: 1; }

.nav__links,
.language > summary,
.nav__action {
  border: 1px solid rgba(17, 17, 15, 0.055);
  border-radius: var(--radius);
  background: rgba(239, 239, 236, 0.76);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(18px) saturate(125%);
  -webkit-backdrop-filter: blur(18px) saturate(125%);
  transition: color 300ms ease, background 300ms ease, border-color 300ms ease, transform 180ms ease;
}

.site-header.is-light .nav__links,
.site-header.is-light .language > summary,
.site-header.is-light .nav__action {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(24, 54, 101, 0.42);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
  padding: 16px 32px;
}
.nav__links a, .nav__links span { opacity: 0.74; }
.nav__links .is-current { opacity: 1; font-weight: 600; }
.nav__links span { cursor: default; }

.header__actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 9px;
}

.nav__action {
  padding: 16px 22px;
  white-space: nowrap;
}
.nav__action:hover { transform: translateY(-2px); }

.language { position: relative; }
.language > summary {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  cursor: pointer;
  list-style: none;
}
.language > summary::-webkit-details-marker { display: none; }
.language__menu {
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  display: grid;
  width: 150px;
  padding: 7px;
  border: 1px solid rgba(17, 17, 15, 0.08);
  border-radius: 18px;
  background: rgba(248, 248, 245, 0.95);
  box-shadow: 0 18px 48px rgba(8, 20, 42, 0.15);
  color: var(--ink);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.language__menu button {
  border: 0;
  border-radius: 12px;
  padding: 10px 11px;
  color: inherit;
  text-align: left;
  background: transparent;
  cursor: pointer;
}
.language__menu button:hover,
.language__menu .is-current { background: #e7edf5; }

.scene,
.chapter,
.closing {
  position: relative;
  isolation: isolate;
  min-height: 100dvh;
  overflow: hidden;
}

.scene__image,
.scene__veil,
.system__scrim,
.chapter__image,
.chapter__veil,
.closing__image,
.closing__veil {
  position: absolute;
  inset: 0;
}

.scene__image,
.chapter__image,
.closing__image {
  z-index: -3;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.scene--hero { color: #f8f8f5; }
.scene--hero .scene__image { background-image: url("./assets/sports-frontal-day-v1.lossless.webp"); }
.scene--hero .scene__veil {
  z-index: -2;
  background: linear-gradient(180deg, rgba(5, 30, 90, 0.04), rgba(2, 20, 68, 0.08) 62%, rgba(0, 16, 38, 0.13));
}

.hero {
  position: absolute;
  z-index: 2;
}
.hero--center {
  top: 46%;
  left: 50%;
  width: min(1360px, calc(100% - 64px));
  transform: translate(-50%, -50%);
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 22px;
  padding: 10px 17px 9px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.scene--hero .eyebrow {
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(21, 50, 102, 0.43);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

h1, h2 {
  margin: 0;
  font-family: "Neue Power", "Instrument Sans", sans-serif;
  font-weight: 800;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
h1 { font-size: clamp(58px, 4.5vw, 86px); line-height: 0.88; }

.hero__copy {
  max-width: 690px;
  margin: 28px auto 0;
  font-size: clamp(16px, 1.13vw, 21px);
  line-height: 1.28;
  text-wrap: balance;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 28px;
  padding: 16px 22px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 180ms ease, background-color 180ms ease;
}
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(1px); }
.button--light { color: var(--ink); background: #f8f8f5; }

.scene--system { background: var(--paper); }
.scene--system .scene__image {
  background-image: url("./assets/02-operating-structure.png");
  background-position: center bottom;
}
.system__scrim {
  z-index: -2;
  background: linear-gradient(90deg, rgba(248, 248, 245, 0.98) 0%, rgba(248, 248, 245, 0.9) 31%, rgba(248, 248, 245, 0.1) 59%, rgba(248, 248, 245, 0.18) 100%);
}
.system__intro {
  position: absolute;
  top: 18%;
  left: clamp(28px, 7.8vw, 150px);
  z-index: 2;
  width: min(700px, 46vw);
}
.system__intro .eyebrow { margin-bottom: 18px; background: rgba(228, 228, 224, 0.82); }
.system__intro h2 { font-size: clamp(52px, 4vw, 78px); line-height: 0.91; }
.system__intro > p:last-child {
  max-width: 610px;
  margin: 23px 0 0;
  color: rgba(17, 17, 15, 0.72);
  font-size: clamp(16px, 1.05vw, 20px);
  line-height: 1.42;
}

.system__map {
  position: absolute;
  left: clamp(28px, 5vw, 96px);
  right: clamp(28px, 5vw, 96px);
  bottom: 0;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 52px 0 24px;
  background: linear-gradient(180deg, rgba(248, 248, 245, 0), rgba(248, 248, 245, 0.68) 34%, rgba(248, 248, 245, 0.84) 100%);
}
.system__map a {
  position: relative;
  min-height: 138px;
  padding: 22px 44px 18px 0;
  border-top: 1px solid rgba(17, 17, 15, 0.22);
  transition: color 220ms ease, transform 220ms ease, border-color 220ms ease;
}
.system__map a:not(:last-child) { margin-right: 34px; }
.system__map strong {
  display: block;
  font-family: "Neue Power", "Instrument Sans", sans-serif;
  font-size: clamp(28px, 2.2vw, 42px);
  line-height: 0.95;
  letter-spacing: -0.03em;
}
.system__map span {
  display: block;
  max-width: 220px;
  margin-top: 13px;
  color: rgba(17, 17, 15, 0.62);
  font-size: 14px;
  line-height: 1.35;
}
.system__map b {
  position: absolute;
  top: 22px;
  right: 5px;
  color: var(--accent);
  font-size: 23px;
  font-weight: 400;
}
.system__map a:hover { color: #9f9570; transform: translateY(-5px); border-color: var(--accent); }

.journey {
  position: relative;
  isolation: isolate;
  background: var(--paper);
}

.stage,
.closing {
  position: relative;
  min-height: 100dvh;
  overflow: hidden;
  background: var(--paper);
}

.stage {
  display: grid;
  align-items: center;
  padding: 116px clamp(34px, 6vw, 104px) 92px;
}

.stage__inner {
  position: relative;
  z-index: 2;
  width: min(1180px, 100%);
  margin: 0 auto;
}

.stage__heading { text-align: center; }

.stage__heading h2 {
  font-size: clamp(56px, 5.2vw, 96px);
  line-height: 0.88;
}

.stage__heading p {
  max-width: 610px;
  margin: 25px auto 0;
  color: rgba(17, 17, 15, 0.67);
  font-size: clamp(16px, 1.08vw, 20px);
  line-height: 1.42;
}

.stage__heading--center { text-align: center; }

.validation-gate {
  display: grid;
  grid-template-columns: repeat(3, 1fr) 1.12fr;
  gap: 0;
  margin-top: clamp(64px, 8vh, 96px);
  border-top: 1px solid rgba(17, 17, 15, 0.24);
}

.validation-gate__condition,
.validation-gate__decision {
  min-height: 182px;
  padding: 21px 22px 18px 0;
}

.validation-gate__condition + .validation-gate__condition { padding-left: 24px; }
.validation-gate__condition strong,
.validation-gate__condition span { display: block; }
.validation-gate__condition strong { font-size: 20px; }
.validation-gate__condition span { max-width: 190px; margin-top: 56px; color: rgba(17, 17, 15, 0.6); line-height: 1.38; }

.validation-gate__decision {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding-left: 30px;
  border-left: 1px solid rgba(17, 17, 15, 0.24);
}
.validation-gate__decision span { max-width: 110px; color: rgba(17, 17, 15, 0.64); line-height: 1.3; }
.validation-gate__decision strong { font-family: "Neue Power", sans-serif; font-size: clamp(62px, 6vw, 104px); line-height: 0.72; }

.stage__inner--structure { width: min(1080px, 100%); }
.structure-model {
  position: relative;
  width: min(940px, 100%);
  height: 390px;
  margin: 44px auto 0;
}
.structure-model::before,
.structure-model::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: rgba(214, 207, 178, 0.72);
  transform: translate(-50%, -50%);
}
.structure-model::before { width: 72%; height: 1px; }
.structure-model::after { width: 1px; height: 72%; }
.structure-model__core {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 194px;
  height: 194px;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--paper);
  color: #9f9570;
  font-family: "Neue Power", sans-serif;
  font-size: 30px;
  line-height: 0.9;
  text-align: center;
  transform: translate(-50%, -50%);
  transition: transform 420ms cubic-bezier(0.16, 1, 0.3, 1), background 420ms ease, color 420ms ease;
}
.structure-model:hover .structure-model__core { color: var(--ink); background: var(--accent); transform: translate(-50%, -50%) scale(1.045); }
.structure-model__item { position: absolute; display: grid; gap: 7px; min-width: 190px; }
.structure-model__item strong { font-size: 19px; }
.structure-model__item small { color: rgba(17, 17, 15, 0.58); font-size: 14px; }
.structure-model__item--mandate { top: 8%; left: 0; }
.structure-model__item--role { top: 8%; right: 0; text-align: right; }
.structure-model__item--economics { bottom: 8%; left: 0; }
.structure-model__item--exit { right: 0; bottom: 8%; text-align: right; }

.stage__inner--build { width: min(1050px, 100%); }
.assembly { position: relative; display: grid; gap: 0; width: min(820px, 100%); margin: 42px auto 0; padding: 28px 0; }
.assembly > div {
  display: grid;
  grid-template-columns: 140px 1fr;
  align-items: baseline;
  gap: 22px;
  width: calc(100% - (var(--order) * 28px));
  margin-left: calc(var(--order) * 28px);
  padding: 19px 0;
  border-bottom: 1px solid rgba(17, 17, 15, 0.22);
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1), color 220ms ease;
}
.assembly > div:hover { color: #9f9570; transform: translateX(10px); }
.assembly > div strong { font-family: "Neue Power", sans-serif; font-size: 34px; line-height: 0.9; }
.assembly > div span { color: rgba(17, 17, 15, 0.58); }
.assembly__state {
  justify-self: end;
  margin-top: 28px;
  color: #9f9570;
  font-family: "Neue Power", sans-serif;
  font-size: clamp(72px, 7vw, 120px);
  line-height: 0.75;
}

.stage__inner--operate { width: min(1000px, 100%); }
.operating-loop {
  position: relative;
  width: min(380px, 34vw);
  margin: 42px auto 0;
  aspect-ratio: 1;
  border: 1px solid rgba(214, 207, 178, 0.82);
  border-radius: 50%;
}
.operating-loop::before {
  content: "";
  position: absolute;
  inset: -2px;
  border: 3px solid transparent;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: operating-cycle 9s linear infinite;
}
@keyframes operating-cycle { to { transform: rotate(360deg); } }
.operating-loop__core {
  position: absolute;
  top: 50%;
  left: 50%;
  color: #9f9570;
  font-family: "Neue Power", sans-serif;
  font-size: clamp(38px, 3.7vw, 66px);
  line-height: 0.84;
  text-align: center;
  transform: translate(-50%, -50%);
}
.operating-loop__item { position: absolute; padding: 8px 12px; background: var(--paper); font-weight: 600; }
.operating-loop__item--quality { top: 8%; left: -5%; }
.operating-loop__item--cash { top: 8%; right: -2%; }
.operating-loop__item--evidence { bottom: 8%; left: -7%; }
.operating-loop__item--decision { right: -6%; bottom: 8%; }

.closing {
  display: grid;
  place-items: center;
  padding: 110px clamp(36px, 7vw, 110px) 100px;
}
.closing__content { width: min(1080px, 100%); text-align: center; }
.closing h2 { font-size: clamp(58px, 5.7vw, 106px); line-height: 0.88; }
.closing p { margin: 27px auto 0; color: rgba(17, 17, 15, 0.66); font-size: 18px; }
.button--dark { color: var(--paper); background: var(--ink); }

.concept-footer {
  position: relative;
  z-index: 30;
  min-height: 76dvh;
  padding: clamp(72px, 8vw, 128px) clamp(28px, 5vw, 80px) 38px;
  overflow: hidden;
  color: var(--paper);
  background: #0a0a09;
}
.concept-footer__lead { display: flex; align-items: flex-start; justify-content: space-between; gap: 48px; }
.concept-footer__brand { display: inline-flex; align-items: center; gap: 16px; font-size: 18px; font-weight: 600; }
.concept-footer__brand img { width: 58px; height: 41px; object-fit: contain; }
.concept-footer__lead > p { width: min(460px, 38vw); margin: 0; color: rgba(248, 248, 245, 0.62); font-size: 20px; line-height: 1.45; }
.concept-footer__wordmark {
  margin: clamp(68px, 10vh, 120px) 0 0;
  font-family: "Neue Power", sans-serif;
  font-size: clamp(150px, 23vw, 420px);
  line-height: 0.62;
  letter-spacing: -0.055em;
  white-space: nowrap;
}
.concept-footer__columns {
  display: grid;
  grid-template-columns: 1fr 1.3fr 1fr;
  gap: 40px;
  margin-top: clamp(76px, 10vh, 120px);
  padding-top: 24px;
  border-top: 1px solid rgba(248, 248, 245, 0.22);
}
.concept-footer__columns nav { display: grid; justify-items: start; gap: 10px; }
.concept-footer__columns nav p,
.concept-footer__statement p { margin: 0 0 8px; color: rgba(248, 248, 245, 0.44); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; }
.concept-footer__columns a,
.concept-footer__columns span { color: rgba(248, 248, 245, 0.78); }
.concept-footer__columns a:hover { color: #fff; }
.concept-footer__statement { align-self: end; text-align: right; }
.concept-footer__statement span { font-size: 13px; }
.concept-footer__bottom {
  margin-top: 42px;
  color: rgba(248, 248, 245, 0.46);
  font-size: 13px;
}
.concept-footer__bottom p { margin: 0; }

/* Direction v3: the story after the structural reveal is driven by four
   distinct operating instruments, not by a decorative connecting line. */
.scene--system .scene__image {
  background-image: url("./assets/02-operating-structure.png"), url("./assets/sports-frontal-day-v1.lossless.webp");
  background-position: center 68%, center bottom;
  background-size: 100% auto, cover;
  background-blend-mode: multiply, normal;
}

.system__scrim {
  background: linear-gradient(180deg, rgba(248, 248, 245, 0.96) 0%, rgba(248, 248, 245, 0.82) 34%, rgba(248, 248, 245, 0.18) 64%, rgba(248, 248, 245, 0.52) 100%);
}

.system__intro {
  top: 13%;
  left: 50%;
  width: min(860px, calc(100% - 56px));
  text-align: center;
  transform: translateX(-50%);
}

.system__intro > p:last-child { margin-right: auto; margin-left: auto; }

.system__map {
  left: clamp(24px, 4.2vw, 72px);
  right: clamp(24px, 4.2vw, 72px);
  bottom: clamp(22px, 4vh, 42px);
  gap: 12px;
  padding: 0;
  background: none;
}

.system__map a {
  min-height: 154px;
  margin-right: 0 !important;
  padding: 24px 48px 22px 24px;
  border: 1px solid rgba(17, 17, 15, 0.12);
  border-radius: 20px;
  background: rgba(248, 248, 245, 0.84);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.74);
  backdrop-filter: blur(14px) saturate(105%);
  -webkit-backdrop-filter: blur(14px) saturate(105%);
}

.system__map a:hover {
  color: var(--ink);
  border-color: rgba(159, 149, 112, 0.72);
  background: rgba(248, 248, 245, 0.96);
  transform: translateY(-7px);
}

.system__map b { right: 22px; }

.journey { background: var(--paper); }

.stage {
  min-height: 112dvh;
  padding: 122px clamp(26px, 6vw, 104px) 106px;
}

.stage__inner { width: min(1160px, 100%); }

.stage__kicker {
  margin: 0 auto 16px !important;
  color: #9f9570 !important;
  font-family: "Neue Power", "Instrument Sans", sans-serif;
  font-size: clamp(22px, 2vw, 34px) !important;
  font-weight: 800;
  line-height: 0.9 !important;
  letter-spacing: 0.01em;
}

.stage__heading h2 { font-size: clamp(54px, 5vw, 92px); }
.stage__heading > p:last-child { max-width: 700px; }

/* Validate: a real decision surface. Each condition can take visual control. */
.validation-gate {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  width: min(1080px, 100%);
  min-height: 390px;
  margin: 54px auto 0;
  overflow: hidden;
  border: 0;
  border-radius: 28px;
  color: var(--paper);
  background: var(--ink);
}

.validation-gate__condition {
  min-height: 274px;
  padding: 34px 32px 30px !important;
  border-right: 1px solid rgba(248, 248, 245, 0.16);
  transition: color 360ms cubic-bezier(0.16, 1, 0.3, 1), background 360ms cubic-bezier(0.16, 1, 0.3, 1), transform 360ms cubic-bezier(0.16, 1, 0.3, 1);
}

.validation-gate__condition:nth-child(3) { border-right: 0; }
.validation-gate__condition strong { font-family: "Neue Power", sans-serif; font-size: clamp(38px, 3vw, 56px); line-height: 0.9; }
.validation-gate__condition span { max-width: 210px; margin-top: 136px; color: rgba(248, 248, 245, 0.62); font-size: 15px; }
.validation-gate__condition:hover { color: var(--ink); background: var(--accent); transform: translateY(-8px); }
.validation-gate__condition:hover span { color: rgba(17, 17, 15, 0.68); }

.validation-gate__decision {
  grid-column: 1 / -1;
  min-height: 116px;
  padding: 20px 30px;
  border-top: 1px solid rgba(248, 248, 245, 0.18);
  border-left: 0;
}

.validation-gate__decision span { max-width: none; color: rgba(248, 248, 245, 0.58); }
.validation-gate__decision strong { color: var(--accent); font-size: clamp(72px, 7vw, 116px); }

/* Structure: one operating core, with four conditions held in orbit. */
.stage--structure { background: #f1f0ea; }
.structure-model {
  width: min(900px, 100%);
  height: 470px;
  margin-top: 50px;
}

.structure-model::before,
.structure-model::after {
  border: 1px solid rgba(159, 149, 112, 0.42);
  border-radius: 50%;
  background: transparent;
}

.structure-model::before { width: 78%; height: 56%; }
.structure-model::after { width: 54%; height: 84%; }

.structure-model__core {
  width: 224px;
  height: 224px;
  border: 0;
  color: var(--paper);
  background: var(--ink);
  box-shadow: 0 24px 70px rgba(17, 17, 15, 0.12);
}

.structure-model:hover .structure-model__core { color: var(--ink); background: var(--accent); }

.structure-model__item {
  z-index: 3;
  min-width: 210px;
  padding: 17px 20px;
  border: 1px solid rgba(17, 17, 15, 0.11);
  border-radius: 18px;
  background: rgba(248, 248, 245, 0.94);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1), border-color 300ms ease;
}

.structure-model__item:hover { border-color: #9f9570; transform: scale(1.045); }
.structure-model__item--mandate { top: 5%; left: 1%; }
.structure-model__item--role { top: 5%; right: 1%; }
.structure-model__item--economics { bottom: 5%; left: 1%; }
.structure-model__item--exit { right: 1%; bottom: 5%; }

/* Build: the operating unit appears as an exploded stack of real responsibilities. */
.stage--build { background: var(--paper); }
.assembly {
  position: relative;
  display: block;
  width: min(920px, 100%);
  height: 500px;
  margin: 48px auto 0;
  padding: 42px;
  overflow: hidden;
  border-radius: 28px;
  background: #e9e7dd;
  perspective: 1000px;
}

.assembly::before {
  content: "OPERATING UNIT";
  position: absolute;
  top: 34px;
  right: 34px;
  color: rgba(17, 17, 15, 0.2);
  font-family: "Neue Power", sans-serif;
  font-size: clamp(32px, 4.4vw, 74px);
  line-height: 0.85;
}

.assembly > div {
  position: absolute;
  top: calc(42px + (var(--order) * 82px));
  left: calc(42px + (var(--order) * 34px));
  z-index: calc(5 - var(--order));
  display: grid;
  grid-template-columns: 150px 1fr;
  align-items: center;
  gap: 24px;
  width: min(600px, calc(100% - 180px));
  min-height: 104px;
  margin: 0;
  padding: 22px 26px;
  border: 1px solid rgba(17, 17, 15, 0.12);
  border-radius: 18px;
  background: rgba(248, 248, 245, 0.98);
  box-shadow: 0 20px 50px rgba(17, 17, 15, 0.09);
  transform: rotateX(2deg) rotateZ(calc((var(--order) - 1.5) * 0.35deg));
}

.assembly > div:hover {
  z-index: 8;
  color: var(--ink);
  transform: translateX(18px) rotate(0);
}

.assembly > div strong { font-size: 34px; }
.assembly__state {
  position: absolute;
  right: 34px;
  bottom: 32px;
  margin: 0;
  color: #9f9570;
  font-size: clamp(76px, 8vw, 132px);
}

/* Operate: delivery is a live cycle, not a static checklist. */
.stage--operate { background: #f1f0ea; }
.operating-loop {
  width: min(520px, 44vw);
  margin-top: 48px;
  border: 0;
  background: radial-gradient(circle at center, var(--paper) 0 27%, transparent 27.4% 43%, rgba(214, 207, 178, 0.34) 43.3% 43.8%, transparent 44.1% 100%);
}

.operating-loop::before {
  inset: 8%;
  border-width: 4px;
  border-top-color: var(--accent);
  border-right-color: var(--accent);
  animation-duration: 14s;
}

.operating-loop::after {
  content: "";
  position: absolute;
  inset: 20%;
  border: 1px solid rgba(17, 17, 15, 0.15);
  border-radius: 50%;
}

.operating-loop__core {
  z-index: 2;
  display: grid;
  place-items: center;
  width: 46%;
  aspect-ratio: 1;
  border-radius: 50%;
  color: var(--accent);
  background: var(--ink);
  font-size: clamp(34px, 3.5vw, 58px);
}

.operating-loop__item {
  z-index: 3;
  min-width: 112px;
  padding: 11px 15px;
  border: 1px solid rgba(17, 17, 15, 0.11);
  border-radius: 999px;
  background: rgba(248, 248, 245, 0.96);
  text-align: center;
  transition: color 240ms ease, background 240ms ease, transform 240ms ease;
}

.operating-loop__item:hover { color: var(--paper); background: var(--ink); transform: scale(1.06); }
.operating-loop__item--quality { top: 4%; left: 6%; }
.operating-loop__item--cash { top: 4%; right: 6%; }
.operating-loop__item--evidence { bottom: 4%; left: 6%; }
.operating-loop__item--decision { right: 6%; bottom: 4%; }

.closing {
  min-height: 92dvh;
  padding: 110px clamp(26px, 7vw, 110px) 100px;
  background: var(--accent);
}

.closing__content { position: relative; z-index: 2; }
.closing p { color: rgba(17, 17, 15, 0.68); }

.reveal {
  opacity: 0;
  transition: opacity 720ms cubic-bezier(0.16, 1, 0.3, 1), transform 720ms cubic-bezier(0.16, 1, 0.3, 1);
}
.hero--center.reveal { transform: translate(-50%, calc(-50% + 18px)); }
.system__intro.reveal { transform: translate(-50%, 18px); }
.system__map.reveal, .stage__inner.reveal, .closing__content.reveal { transform: translateY(18px); }
.hero--center.is-visible { opacity: 1; transform: translate(-50%, -50%); }
.system__intro.is-visible { opacity: 1; transform: translate(-50%, 0); }
.system__map.is-visible, .stage__inner.is-visible, .closing__content.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1020px) {
  .site-header { grid-template-columns: 1fr auto; }
  .nav__links { display: none; }
  .hero--center { top: 43%; }
  .system__intro { top: 15%; width: min(690px, calc(100% - 48px)); }
  .system__map { grid-template-columns: repeat(2, 1fr); gap: 10px 22px; }
  .system__map a { min-height: 112px; }
  .operating-loop { width: min(420px, 62vw); }
}

@media (max-width: 640px) {
  :root { --header-x: 16px; }
  .site-header { top: 12px; min-height: 48px; font-size: 13px; }
  .site-header.is-compact { top: 10px; }
  .brand span:last-child { display: none; }
  .brand__mark, .brand__eye { width: 30px; height: 21px; }
  .header__actions { gap: 6px; }
  .language > summary { width: 44px; height: 44px; }
  .nav__action { padding: 13px 15px; }
  .hero--center { top: 42%; width: calc(100% - 28px); }
  .eyebrow { margin-bottom: 16px; font-size: 11px; }
  h1 { font-size: clamp(39px, 12.2vw, 57px); }
  .hero__copy { margin-top: 20px; font-size: 15px; }
  .button { margin-top: 22px; font-size: 14px; padding: 14px 18px; }
  .scene--system { min-height: 124dvh; }
  .scene--system .scene__image { background-position: 61% center; opacity: 0.42; }
  .system__scrim { background: linear-gradient(180deg, rgba(248, 248, 245, 0.99) 0%, rgba(248, 248, 245, 0.86) 55%, rgba(248, 248, 245, 0.6) 100%); }
  .system__intro { top: 12%; left: 18px; width: calc(100% - 36px); }
  .system__intro h2 { font-size: clamp(42px, 12vw, 58px); }
  .system__intro > p:last-child { font-size: 15px; }
  .system__map { left: 18px; right: 18px; bottom: 0; grid-template-columns: 1fr; gap: 0; padding-top: 38px; }
  .system__map a { min-height: 90px; margin-right: 0 !important; padding: 15px 42px 13px 0; }
  .system__map strong { font-size: 28px; }
  .system__map span { max-width: 280px; margin-top: 7px; font-size: 12px; }
  .system__map b { top: 16px; }
  .stage { min-height: auto; padding: 104px 18px; }
  .stage__heading h2 { font-size: clamp(42px, 12vw, 58px); }
  .stage__heading p { margin-top: 18px; font-size: 15px; }
  .validation-gate { grid-template-columns: 1fr; margin-top: 44px; }
  .validation-gate__condition { min-height: auto; padding: 18px 0; border-bottom: 1px solid rgba(17, 17, 15, 0.18); }
  .validation-gate__condition + .validation-gate__condition { padding-left: 0; }
  .validation-gate__condition span { margin-top: 8px; }
  .validation-gate__decision { min-height: 126px; padding: 22px 0 0; border-left: 0; }
  .structure-model { height: 430px; margin-top: 34px; }
  .structure-model__core { width: 156px; height: 156px; font-size: 25px; }
  .structure-model__item { min-width: 120px; }
  .structure-model__item small { max-width: 126px; font-size: 12px; }
  .stage__inner--build,
  .stage__inner--operate { display: block; }
  .assembly { margin-top: 38px; }
  .assembly > div { grid-template-columns: 96px 1fr; width: calc(100% - (var(--order) * 10px)); margin-left: calc(var(--order) * 10px); }
  .assembly > div strong { font-size: 27px; }
  .assembly > div span { font-size: 13px; }
  .assembly__state { font-size: 70px; }
  .operating-loop { width: min(286px, 80vw); margin: 54px auto 0; }
  .operating-loop__core { font-size: 38px; }
  .operating-loop__item { padding: 6px 8px; font-size: 12px; }
  .closing { min-height: 100dvh; padding: 100px 18px 90px; }
  .closing h2 { font-size: clamp(42px, 11.4vw, 55px); line-height: 0.92; }
  .closing p { font-size: 15px; }
  .concept-footer { min-height: 100dvh; padding: 74px 20px 30px; }
  .concept-footer__lead { display: grid; gap: 28px; }
  .concept-footer__lead > p { width: 100%; font-size: 17px; }
  .concept-footer__wordmark { margin-top: 92px; font-size: 25vw; line-height: 0.68; }
  .concept-footer__columns { grid-template-columns: 1fr 1fr; gap: 48px 22px; }
  .concept-footer__statement { grid-column: 1 / -1; text-align: left; }
  .concept-footer__bottom { margin-top: 38px; }

  .scene--system { min-height: 100dvh; }
  .scene--system .scene__image {
    background-position: center 68%, 55% bottom;
    background-size: 100% auto, cover;
    opacity: 1;
  }
  .system__scrim { background: linear-gradient(180deg, rgba(248, 248, 245, 0.98) 0%, rgba(248, 248, 245, 0.8) 35%, rgba(248, 248, 245, 0.12) 61%, rgba(248, 248, 245, 0.66) 100%); }
  .system__intro { top: 10%; left: 50%; width: calc(100% - 36px); transform: translateX(-50%); }
  .system__intro > p:last-child { font-size: 14px; }
  .system__map {
    left: 14px;
    right: 14px;
    bottom: 14px;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    padding: 0;
  }
  .system__map a {
    min-height: 118px;
    padding: 16px 30px 14px 15px;
    border-radius: 16px;
  }
  .system__map strong { font-size: 25px; }
  .system__map span { max-width: 160px; margin-top: 8px; font-size: 11px; }
  .system__map b { top: 15px; right: 14px; }

  .stage { min-height: auto; padding: 96px 16px 90px; }
  .stage__kicker { margin-bottom: 13px !important; font-size: 22px !important; }
  .stage__heading h2 { font-size: clamp(40px, 11.2vw, 54px); }

  .validation-gate {
    display: grid;
    grid-template-columns: 1fr;
    min-height: 0;
    margin-top: 38px;
    border-radius: 22px;
  }
  .validation-gate__condition {
    min-height: 150px;
    padding: 24px !important;
    border-right: 0;
    border-bottom: 1px solid rgba(248, 248, 245, 0.16);
  }
  .validation-gate__condition strong { font-size: 36px; }
  .validation-gate__condition span { margin-top: 48px; }
  .validation-gate__decision { grid-column: 1; min-height: 108px; padding: 18px 22px; border-top: 0; }
  .validation-gate__decision strong { font-size: 70px; }

  .structure-model { height: 460px; margin-top: 34px; }
  .structure-model::before { width: 94%; height: 52%; }
  .structure-model::after { width: 58%; height: 86%; }
  .structure-model__core { width: 150px; height: 150px; font-size: 24px; }
  .structure-model__item { min-width: 0; width: 44%; padding: 13px 14px; }
  .structure-model__item strong { font-size: 15px; }
  .structure-model__item small { max-width: none; font-size: 11px; }

  .assembly {
    height: 520px;
    margin-top: 36px;
    padding: 22px;
    border-radius: 22px;
  }
  .assembly::before { top: 24px; right: 22px; font-size: 33px; }
  .assembly > div {
    top: calc(82px + (var(--order) * 82px));
    left: calc(18px + (var(--order) * 8px));
    grid-template-columns: 106px 1fr;
    gap: 14px;
    width: calc(100% - 62px);
    min-height: 92px;
    padding: 18px;
    border-radius: 15px;
  }
  .assembly > div strong { font-size: 25px; }
  .assembly > div span { font-size: 12px; }
  .assembly__state { right: 20px; bottom: 18px; font-size: 64px; }

  .operating-loop { width: min(360px, 94vw); margin-top: 38px; }
  .operating-loop__core { width: 48%; font-size: 33px; }
  .operating-loop__item { min-width: 92px; padding: 8px 10px; font-size: 11px; }
  .operating-loop__item--quality { top: 2%; left: 1%; }
  .operating-loop__item--cash { top: 2%; right: 1%; }
  .operating-loop__item--evidence { bottom: 2%; left: 1%; }
  .operating-loop__item--decision { right: 1%; bottom: 2%; }

  .closing { min-height: 92dvh; padding: 96px 18px 82px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .site-header, .reveal, .hero--center.reveal, .system__intro.reveal, .system__map.reveal,
  .stage__inner.reveal, .closing__content.reveal {
    opacity: 1;
    transition: none;
  }
  .hero--center.reveal { transform: translate(-50%, -50%); }
  .system__intro.reveal { transform: translateX(-50%); }
  .system__map.reveal, .stage__inner.reveal, .closing__content.reveal { transform: none; }
  .operating-loop::before { animation: none; }
}

@media (prefers-reduced-transparency: reduce) {
  .nav__links, .language > summary, .nav__action, .scene--hero .eyebrow {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .site-header.is-light .nav__links,
  .site-header.is-light .language > summary,
  .site-header.is-light .nav__action { background: rgba(20, 52, 106, 0.92); }
}