:root {
  --obsidian-950: #070908;
  --obsidian-900: #0c0f0d;
  --obsidian-850: #111512;
  --obsidian-800: #171b18;
  --jade-500: #437d64;
  --jade-400: #70a588;
  --jade-300: #9bc6ad;
  --ivory-100: #eee5d7;
  --ivory-200: #d7cdbd;
  --ivory-400: #aaa194;
  --brass-400: #b49a69;
  --line: rgba(238, 229, 215, 0.14);
  --line-jade: rgba(112, 165, 136, 0.28);
  --header-height: 76px;
  --content: 1180px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--obsidian-950);
  color: var(--ivory-100);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 78% 18%, rgba(55, 105, 82, 0.08), transparent 30%),
    linear-gradient(180deg, var(--obsidian-950), #090b0a 55%, #060807);
  color: var(--ivory-100);
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", serif;
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}

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

a,
button {
  touch-action: manipulation;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--jade-300);
  outline-offset: 5px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 14px;
  border: 1px solid var(--line-jade);
  background: var(--obsidian-900);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: max(16px, env(safe-area-inset-top)) clamp(20px, 4vw, 68px) 14px;
  border-bottom: 1px solid rgba(238, 229, 215, 0.08);
  background: linear-gradient(180deg, rgba(7, 9, 8, 0.94), rgba(7, 9, 8, 0.7));
  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  min-height: 44px;
}

.brand-name {
  color: var(--ivory-100);
  font-family: Didot, "Bodoni 72", "Times New Roman", serif;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.brand-tag {
  padding-left: 13px;
  border-left: 1px solid var(--line);
  color: var(--jade-300);
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.desktop-nav,
.mobile-nav {
  align-items: center;
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
}

.desktop-nav {
  display: flex;
  gap: clamp(20px, 2.4vw, 42px);
}

.desktop-nav a,
.mobile-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--ivory-400);
  transition: color 180ms ease;
}

.desktop-nav a::after {
  position: absolute;
  right: 0;
  bottom: 8px;
  left: 0;
  height: 1px;
  background: currentColor;
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms ease;
}

.desktop-nav a:hover,
.desktop-nav a:focus-visible,
.mobile-nav a:hover,
.mobile-nav a:focus-visible {
  color: var(--ivory-100);
}

.desktop-nav a:hover::after,
.desktop-nav a:focus-visible::after {
  transform: scaleX(1);
}

.desktop-nav .nav-register,
.mobile-nav .nav-register {
  color: var(--brass-400);
}

.desktop-nav .nav-ai,
.mobile-nav .nav-ai {
  color: var(--jade-300);
}

.mobile-nav {
  display: none;
  gap: 14px;
}

.hero {
  position: relative;
  display: grid;
  min-height: max(760px, 100svh);
  grid-template-columns: minmax(0, 1.1fr) minmax(380px, 0.9fr);
  align-items: end;
  gap: clamp(24px, 6vw, 96px);
  padding: calc(var(--header-height) + clamp(80px, 12vh, 140px)) max(24px, calc((100vw - var(--content)) / 2)) clamp(58px, 9vh, 100px);
  isolation: isolate;
  overflow: hidden;
  background: var(--obsidian-950) url("./assets/obsidian-jade-field.webp") 50% 50% / cover no-repeat;
}

.hero::before,
.entry::before {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(7, 9, 8, 0.94) 0%, rgba(7, 9, 8, 0.58) 53%, rgba(7, 9, 8, 0.26) 100%),
    linear-gradient(0deg, var(--obsidian-950) 0%, transparent 28%);
  content: "";
}

.resonance-layer,
.hero-grain,
.entry-grain {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.resonance-layer {
  z-index: -1;
  opacity: 0.62;
  mix-blend-mode: screen;
}

.hero-grain,
.entry-grain {
  z-index: -1;
  opacity: 0.22;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.86' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
}

.hero-copy {
  position: relative;
  z-index: 3;
  max-width: 690px;
  padding-bottom: 4vh;
}

.hero-titles {
  display: flex;
  align-items: flex-end;
  gap: clamp(24px, 4vw, 58px);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  margin: 0;
  font-family: Didot, "Bodoni 72", "Times New Roman", serif;
  font-size: clamp(82px, 13vw, 188px);
  font-weight: 400;
  letter-spacing: -0.065em;
  line-height: 0.78;
  text-wrap: balance;
}

.hero-reading {
  margin: 0 0 1.15em;
  color: var(--brass-400);
  font-size: clamp(16px, 1.6vw, 24px);
  letter-spacing: 0.42em;
  white-space: nowrap;
}

.hero-mission {
  max-width: 590px;
  margin: 32px 0 0;
  color: var(--ivory-200);
  font-size: clamp(16px, 1.35vw, 21px);
  line-height: 2;
  letter-spacing: 0.055em;
}

.field-instrument {
  position: relative;
  z-index: 2;
  align-self: stretch;
  min-height: 520px;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.field-instrument::before,
.field-instrument::after {
  position: absolute;
  right: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-jade), transparent);
  content: "";
}

.field-instrument::before { top: 19%; }
.field-instrument::after { bottom: 19%; }

.field-lines {
  position: absolute;
  inset: 8% -15%;
  width: 130%;
  height: 84%;
  overflow: visible;
}

.field-lines path {
  fill: none;
  stroke: rgba(104, 161, 131, 0.45);
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
}

.field-lines .field-line-brass {
  stroke: rgba(180, 154, 105, 0.43);
}

.field-node,
.field-status {
  position: absolute;
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-size: 9px;
  letter-spacing: 0.16em;
}

.field-node {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--jade-300);
}

.field-node i,
.field-status i {
  display: block;
  width: 7px;
  height: 7px;
  border: 1px solid var(--jade-300);
  border-radius: 50%;
  box-shadow: 0 0 14px rgba(111, 164, 135, 0.44);
}

.field-node-human { top: 24%; left: 8%; }
.field-node-ai { right: 5%; bottom: 25%; }

.field-status {
  top: 50%;
  right: 16%;
  display: grid;
  padding: 18px 20px;
  border-left: 1px solid var(--brass-400);
  color: var(--ivory-400);
}

.field-status strong {
  color: var(--ivory-100);
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.14em;
}

.field-status i {
  position: absolute;
  top: calc(50% - 4px);
  left: -4px;
  border-color: var(--brass-400);
  background: var(--brass-400);
}

.section-shell {
  position: relative;
  padding: clamp(108px, 15vw, 220px) max(24px, calc((100vw - var(--content)) / 2));
}

.concept {
  border-top: 1px solid var(--line);
  background:
    linear-gradient(130deg, rgba(45, 86, 67, 0.07), transparent 40%),
    var(--obsidian-950);
}

.concept-sequence {
  display: grid;
  gap: clamp(46px, 7vw, 100px);
}

.concept-lead {
  max-width: 960px;
  margin: 0;
  color: var(--ivory-100);
  font-size: clamp(28px, 4.8vw, 66px);
  font-weight: 400;
  letter-spacing: 0.015em;
  line-height: 1.62;
  text-wrap: pretty;
}

.concept-lead-offset {
  margin-left: auto;
  color: var(--jade-300);
  text-align: right;
}

.concept-detail {
  max-width: 760px;
  margin: 0 0 0 auto;
  padding-top: 36px;
  border-top: 1px solid var(--line);
  color: var(--ivory-200);
  font-size: clamp(16px, 1.65vw, 21px);
  line-height: 2.15;
  letter-spacing: 0.05em;
}

.morphic {
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 18% 48%, rgba(56, 112, 84, 0.13), transparent 34%),
    linear-gradient(180deg, #0c0f0d, #090b0a);
}

.morphic-stage {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  align-items: center;
  gap: clamp(50px, 8vw, 120px);
}

.morphic-visual {
  position: relative;
  aspect-ratio: 1.08 / 1;
  max-width: 680px;
  background:
    linear-gradient(180deg, rgba(7, 9, 8, 0.16), rgba(7, 9, 8, 0.84)),
    url("./assets/obsidian-jade-field.webp") 72% 60% / 190% auto no-repeat;
  clip-path: polygon(0 7%, 92% 0, 100% 91%, 8% 100%);
}

.morphic-visual::after {
  position: absolute;
  inset: 1px;
  border: 1px solid rgba(180, 154, 105, 0.2);
  content: "";
  clip-path: inherit;
}

.morphic-visual svg {
  position: absolute;
  inset: 5%;
  width: 90%;
  height: 90%;
  overflow: visible;
}

.morphic-visual ellipse,
.morphic-visual path {
  fill: none;
  stroke: url("#jadeWave");
  stroke-width: 1.1;
  vector-effect: non-scaling-stroke;
}

.morphic-visual ellipse {
  stroke-dasharray: 2 9;
}

.morphic-visual .morphic-strong {
  stroke-width: 1.8;
}

.morphic-node {
  fill: url("#nodeGlow");
}

.morphic-core {
  fill: var(--brass-400);
  filter: drop-shadow(0 0 14px rgba(180, 154, 105, 0.54));
}

.morphic-text {
  position: absolute;
  z-index: 2;
  color: var(--jade-300);
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-size: 9px;
  letter-spacing: 0.16em;
}

.morphic-human { top: 48%; left: 7%; }
.morphic-ai { top: 48%; right: 6%; }
.morphic-center {
  bottom: 16%;
  left: 50%;
  color: var(--brass-400);
  transform: translateX(-50%);
  white-space: nowrap;
}

.morphic-copy {
  display: grid;
  gap: 36px;
}

.morphic-copy p {
  margin: 0;
  color: var(--ivory-200);
  font-size: clamp(17px, 1.7vw, 22px);
  letter-spacing: 0.04em;
  line-height: 2.05;
}

.morphic-copy p + p {
  padding-top: 36px;
  border-top: 1px solid var(--line-jade);
}

.features {
  background: var(--obsidian-950);
}

.features-header {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-bottom: clamp(62px, 9vw, 120px);
}

.features-header::after {
  height: 1px;
  flex: 1;
  background: linear-gradient(90deg, var(--line-jade), transparent);
  content: "";
}

.features h2 {
  margin: 0;
  color: var(--ivory-100);
  font-size: clamp(34px, 4vw, 56px);
  font-weight: 400;
  letter-spacing: 0.32em;
}

.feature-ledger {
  display: grid;
  border-bottom: 1px solid var(--line);
}

.feature-row {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: clamp(20px, 4vw, 66px);
  align-items: start;
  padding: clamp(34px, 4.8vw, 62px) 0;
  border-top: 1px solid var(--line);
}

.feature-row:nth-child(even) p {
  margin-left: auto;
}

.feature-mark {
  width: 7px;
  height: 7px;
  margin-top: 0.85em;
  border: 1px solid var(--jade-300);
  transform: rotate(45deg);
}

.feature-row p {
  width: min(100%, 840px);
  margin: 0;
  color: var(--ivory-200);
  font-size: clamp(16px, 1.55vw, 20px);
  letter-spacing: 0.04em;
  line-height: 2;
}

.entry {
  position: relative;
  display: grid;
  min-height: min(880px, 92svh);
  place-items: end center;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(130px, 20vh, 220px) 24px clamp(76px, 10vh, 118px);
  background: var(--obsidian-950) url("./assets/obsidian-jade-field.webp") 70% 66% / cover no-repeat;
}

.entry::before {
  background:
    linear-gradient(180deg, var(--obsidian-950) 0%, rgba(7, 9, 8, 0.28) 36%, rgba(7, 9, 8, 0.85) 100%),
    linear-gradient(90deg, rgba(7, 9, 8, 0.68), transparent 55%);
}

.entry-copy {
  z-index: 2;
  width: min(100%, 820px);
  text-align: center;
}

.entry-statement {
  margin: 0;
  color: var(--ivory-200);
  font-size: clamp(18px, 2.3vw, 30px);
  letter-spacing: 0.14em;
  line-height: 1.9;
}

.entry-name {
  margin: 22px 0 48px;
  color: var(--ivory-100);
  font-family: Didot, "Bodoni 72", "Times New Roman", "Yu Mincho", serif;
  font-size: clamp(42px, 7vw, 86px);
  letter-spacing: 0.15em;
  line-height: 1.1;
  text-shadow: 0 0 30px rgba(180, 154, 105, 0.2);
}

.entry-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
}

.button {
  display: inline-flex;
  min-width: 220px;
  min-height: 56px;
  align-items: center;
  justify-content: center;
  padding: 14px 26px;
  border: 1px solid var(--line);
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  transition: border-color 180ms ease, background 180ms ease, color 180ms ease;
}

.button-primary {
  border-color: var(--jade-400);
  background: var(--jade-500);
  color: #f8f2e8;
}

.button-primary:hover,
.button-primary:focus-visible {
  border-color: var(--jade-300);
  background: #4f8b70;
}

.button-secondary {
  background: rgba(8, 11, 9, 0.54);
  color: var(--ivory-100);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  border-color: var(--ivory-200);
  background: rgba(238, 229, 215, 0.08);
}

.entry-ai {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  margin-top: 22px;
  border-bottom: 1px solid var(--line-jade);
  color: var(--jade-300);
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-size: 12px;
  letter-spacing: 0.16em;
}

.entry-note {
  margin: 12px 0 0;
  color: var(--ivory-400);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 28px;
  padding: 38px clamp(24px, 5vw, 72px) max(38px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--line);
  background: #070908;
  color: var(--ivory-400);
  font-family: Arial, "Helvetica Neue", sans-serif;
  font-size: 9px;
  letter-spacing: 0.11em;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-brand span {
  color: var(--ivory-200);
  font-family: Didot, "Bodoni 72", serif;
  font-size: 18px;
  letter-spacing: 0.1em;
}

.footer-brand small {
  font-size: inherit;
}

.site-footer p {
  margin: 0;
  text-align: center;
}

.site-footer > a {
  justify-self: end;
  min-height: 44px;
  align-content: center;
  color: var(--ivory-200);
}

.reveal {
  opacity: 0;
  transform: translate3d(0, 16px, 0);
  transition: opacity 620ms ease, transform 620ms cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.is-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

@media (max-width: 900px) {
  :root { --header-height: 68px; }

  .site-header {
    padding-right: 16px;
    padding-left: 18px;
  }

  .brand-tag,
  .desktop-nav {
    display: none;
  }

  .mobile-nav {
    display: flex;
  }

  .hero {
    grid-template-columns: 1fr;
    align-content: space-between;
    padding-top: calc(var(--header-height) + 76px);
  }

  .hero-copy {
    align-self: start;
    padding-bottom: 0;
  }

  .field-instrument {
    align-self: end;
    min-height: 370px;
    margin: 0 -4px;
  }

  .morphic-stage {
    grid-template-columns: 1fr;
  }

  .morphic-visual {
    width: min(100%, 680px);
    justify-self: center;
  }

  .morphic-copy {
    max-width: 720px;
    margin-left: auto;
  }

  .site-footer {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .site-footer > a {
    justify-self: center;
  }
}

@media (max-width: 560px) {
  .site-header {
    min-height: calc(var(--header-height) + env(safe-area-inset-top));
  }

  .brand-name {
    font-size: 19px;
  }

  .mobile-nav {
    gap: 10px;
    letter-spacing: 0.08em;
  }

  .mobile-nav a {
    min-width: 44px;
    min-height: 44px;
    padding-inline: 5px;
    justify-content: center;
    font-size: 10px;
  }

  .hero {
    min-height: 940px;
    padding-right: 20px;
    padding-bottom: 38px;
    padding-left: 20px;
    background-position: 61% 50%;
  }

  .hero::before {
    background:
      linear-gradient(180deg, rgba(7, 9, 8, 0.9), rgba(7, 9, 8, 0.42) 58%, rgba(7, 9, 8, 0.9)),
      linear-gradient(90deg, rgba(7, 9, 8, 0.85), transparent);
  }

  .hero-titles {
    display: grid;
    gap: 16px;
    padding-bottom: 22px;
  }

  .hero h1 {
    font-size: clamp(78px, 27vw, 112px);
  }

  .hero-reading {
    margin: 0;
    font-size: 15px;
  }

  .hero-mission {
    margin-top: 24px;
    font-size: 16px;
    line-height: 1.9;
  }

  .field-instrument {
    min-height: 330px;
    border-right: 0;
    border-left: 0;
  }

  .field-lines {
    inset: 4% -42%;
    width: 184%;
    height: 92%;
  }

  .field-node-human { top: 18%; left: 2%; }
  .field-node-ai { right: 1%; bottom: 19%; }
  .field-status { top: 43%; right: 7%; }

  .section-shell {
    padding: 112px 22px;
  }

  .concept-sequence {
    gap: 62px;
  }

  .concept-lead {
    font-size: 29px;
    line-height: 1.62;
  }

  .concept-lead-offset {
    text-align: left;
  }

  .concept-detail {
    font-size: 16px;
    line-height: 2;
  }

  .morphic {
    padding-top: 92px;
    padding-bottom: 104px;
  }

  .morphic-visual {
    width: calc(100% + 18px);
    margin-left: -9px;
  }

  .morphic-text {
    font-size: 7px;
  }

  .morphic-center {
    bottom: 13%;
  }

  .morphic-copy p {
    font-size: 16px;
    line-height: 2;
  }

  .features-header {
    margin-bottom: 54px;
  }

  .features h2 {
    font-size: 35px;
  }

  .feature-row {
    grid-template-columns: 12px minmax(0, 1fr);
    gap: 18px;
    padding: 34px 0;
  }

  .feature-row p {
    font-size: 16px;
    line-height: 1.95;
  }

  .entry {
    min-height: 820px;
    padding-right: 20px;
    padding-left: 20px;
    background-position: 68% 50%;
  }

  .entry-statement {
    font-size: 17px;
    letter-spacing: 0.08em;
  }

  .entry-name {
    margin-bottom: 38px;
    font-size: 42px;
    letter-spacing: 0.12em;
  }

  .entry-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
    min-height: 56px;
  }

  .entry-note {
    font-size: 11px;
    line-height: 1.7;
  }

  .footer-brand {
    flex-direction: column;
    gap: 4px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .resonance-layer { display: none; }

  .reveal {
    opacity: 1;
    transform: none;
  }
}