:root {
  color-scheme: dark;
  font-family: "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  font-synthesis: none;
  --study-h: 66px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  background: #0a0a0a;
}

body,
button,
a {
  -webkit-font-smoothing: antialiased;
}

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

button {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid #47e8d4;
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: -100px;
  left: 10px;
  padding: 12px 16px;
  color: #050505;
  background: #fff;
  transition: top 160ms ease;
}

.skip-link:focus {
  top: 10px;
}

.study-bar {
  position: sticky;
  z-index: 90;
  top: 0;
  display: grid;
  grid-template-columns: minmax(190px, 1fr) auto minmax(190px, 1fr);
  align-items: center;
  min-height: var(--study-h);
  padding: 0 22px;
  color: #e9e7df;
  border-bottom: 1px solid #30302d;
  background: rgba(12, 12, 12, 0.96);
  backdrop-filter: blur(16px);
}

.study-mark {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font: 600 11px/1.1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.study-mark small {
  color: #9b9a93;
  font-size: 8px;
  letter-spacing: 0.15em;
}

.concept-tabs {
  display: flex;
  gap: 3px;
  padding: 4px;
  border: 1px solid #2f2f2c;
  border-radius: 999px;
  background: #080808;
}

.concept-tab {
  min-height: 44px;
  padding: 0 15px;
  color: #7f7f79;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  font: 600 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.08em;
  transition: color 160ms ease, background-color 160ms ease;
}

.concept-tab span {
  margin-right: 6px;
  color: #4be2cf;
}

.concept-tab:hover {
  color: #f1efe8;
}

.concept-tab.is-active {
  color: #0b0b0a;
  background: #eae7de;
}

.concept-tab.is-active span {
  color: #0d7569;
}

.notes-toggle {
  justify-self: end;
  min-height: 44px;
  padding: 0 16px;
  color: #d7d4cb;
  border: 1px solid #393936;
  border-radius: 0;
  background: #151514;
  cursor: pointer;
  font-size: 12px;
  transition: border-color 160ms ease, color 160ms ease;
}

.notes-toggle:hover {
  color: #fff;
  border-color: #77776f;
}

.direction-notes {
  position: fixed;
  z-index: 120;
  top: calc(var(--study-h) + 14px);
  right: 14px;
  width: min(390px, calc(100vw - 28px));
  max-height: calc(100svh - var(--study-h) - 28px);
  overflow: auto;
  padding: 28px;
  color: #dcd9cf;
  border: 1px solid #4d4d47;
  background: #11110f;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
}

.direction-notes h2 {
  margin: 8px 0 18px;
  color: #fff;
  font: 500 24px/1.15 "Helvetica Neue", sans-serif;
}

.direction-notes p,
.direction-notes li {
  color: #aaa69d;
  font-size: 14px;
  line-height: 1.8;
}

.direction-notes ul {
  padding-left: 18px;
}

.notes-kicker {
  margin: 0;
  color: #4be2cf !important;
  font: 600 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace !important;
  letter-spacing: 0.16em;
}

.notes-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 44px;
  height: 44px;
  color: #ddd;
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: 24px;
}

.concept[hidden],
.direction-notes[hidden],
[data-notes][hidden] {
  display: none;
}

.concept {
  min-height: 100svh;
}

/* ================================================================
   01 — SIGNAL INSTRUMENT
   ================================================================ */

.concept-instrument {
  --bone: #e7e1d4;
  --oxidized: #53d9c5;
  --copper: #bd7a52;
  --ink: #0b0d0c;
  --line: rgba(231, 225, 212, 0.17);
  color: var(--bone);
  background: var(--ink);
}

.instrument-nav {
  position: sticky;
  z-index: 50;
  top: var(--study-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 0 clamp(20px, 5vw, 76px);
  border-bottom: 1px solid var(--line);
  background: rgba(11, 13, 12, 0.82);
  backdrop-filter: blur(18px);
}

.instrument-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font: 600 18px/1 Georgia, serif;
  letter-spacing: 0.08em;
}

.logo-glyph {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--ink);
  border-radius: 50%;
  background: var(--oxidized);
  font: italic 700 18px/1 Georgia, serif;
}

.instrument-links {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 42px);
  color: #aaa69d;
  font-size: 12px;
}

.instrument-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.instrument-links a:hover {
  color: var(--bone);
}

.instrument-links .nav-cta {
  padding: 0 18px;
  color: var(--bone);
  border: 1px solid var(--bone);
}

.instrument-hero {
  position: relative;
  isolation: isolate;
  min-height: calc(100svh - var(--study-h) - 74px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

#field-canvas,
.instrument-grid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

#field-canvas {
  z-index: -3;
  opacity: 0.78;
}

.instrument-grid {
  z-index: -2;
  opacity: 0.45;
  background-image:
    linear-gradient(rgba(83, 217, 197, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(83, 217, 197, 0.06) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(circle at 72% 48%, #000 0 28%, transparent 72%);
}

.instrument-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  pointer-events: none;
  opacity: 0.22;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

.instrument-copy {
  position: absolute;
  z-index: 3;
  top: 50%;
  left: clamp(24px, 7vw, 108px);
  width: min(590px, 44vw);
  transform: translateY(-50%);
}

.instrument-eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 32px;
  color: #85837d;
  font: 600 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.15em;
}

.instrument-eyebrow span {
  color: var(--oxidized);
}

.instrument-copy h1 {
  max-width: 580px;
  margin: 0;
  color: var(--bone);
  font: 400 clamp(52px, 6.4vw, 108px)/0.94 "Yu Mincho", "Hiragino Mincho ProN", Georgia, serif;
  letter-spacing: -0.055em;
}

.instrument-copy h1 em {
  color: transparent;
  -webkit-text-stroke: 1px rgba(231, 225, 212, 0.72);
  font-style: normal;
}

.instrument-lead {
  max-width: 510px;
  margin: 32px 0 0;
  color: #b8b3aa;
  font-size: clamp(15px, 1.25vw, 18px);
  line-height: 1.9;
}

.instrument-actions {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 38px;
}

.instrument-primary,
.instrument-secondary {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
}

.instrument-primary {
  gap: 36px;
  min-width: 220px;
  padding: 0 18px 0 24px;
  color: #07100e;
  background: var(--oxidized);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
  font-size: 13px;
  font-weight: 700;
  transition: background-color 160ms ease, transform 160ms ease;
}

.instrument-primary:hover {
  background: #7cebdc;
  transform: translateY(-2px);
}

.instrument-primary span {
  font-size: 18px;
}

.instrument-secondary {
  color: #aaa69d;
  border-bottom: 1px solid #5c5b56;
  font-size: 12px;
}

.instrument-device {
  position: absolute;
  z-index: 2;
  top: 50%;
  right: clamp(-120px, 1vw, 52px);
  width: min(50vw, 700px);
  aspect-ratio: 1;
  transform: translateY(-50%);
}

.device-svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.dial-orbit,
.dial-arc,
.dial-ticks path {
  fill: none;
  vector-effect: non-scaling-stroke;
}

.dial-orbit {
  stroke: rgba(231, 225, 212, 0.14);
}

.orbit-a {
  stroke-dasharray: 1 11;
  stroke-linecap: round;
}

.orbit-b {
  stroke: rgba(83, 217, 197, 0.32);
  stroke-dasharray: 3 8;
}

.orbit-c {
  stroke: rgba(189, 122, 82, 0.5);
}

.dial-arc {
  stroke-width: 2;
  stroke-linecap: round;
}

.arc-a {
  stroke: var(--oxidized);
}

.arc-b {
  stroke: var(--copper);
}

.dial-ticks path {
  stroke: rgba(231, 225, 212, 0.58);
  stroke-width: 1;
}

.dial-core {
  fill: #121815;
  stroke: rgba(231, 225, 212, 0.38);
}

.dial-pulse {
  fill: var(--oxidized);
  transform-origin: 260px 260px;
  animation: instrumentPulse 2.8s ease-in-out infinite;
}

.dial-label,
.dial-value,
.node text {
  fill: #aaa69d;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.15em;
}

.dial-label {
  font-size: 9px;
}

.dial-value {
  fill: var(--bone);
  font-size: 15px;
}

.node text {
  font-size: 10px;
}

.node circle {
  fill: var(--oxidized);
}

.ai-node circle {
  fill: var(--copper);
}

.orbit-a {
  transform-origin: 260px 260px;
  animation: dialRotate 42s linear infinite;
}

.orbit-b {
  transform-origin: 260px 260px;
  animation: dialRotate 28s linear infinite reverse;
}

.device-index {
  position: absolute;
  right: 10%;
  bottom: 8%;
  display: flex;
  gap: 18px;
  color: #77756e;
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.device-index b {
  color: var(--bone);
}

.instrument-status {
  position: absolute;
  bottom: 0;
  left: 0;
  display: flex;
  width: 100%;
  min-height: 54px;
  align-items: center;
  justify-content: flex-end;
  gap: 32px;
  padding: 0 clamp(20px, 5vw, 76px);
  color: #98948b;
  border-top: 1px solid var(--line);
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.13em;
}

.instrument-status i {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--oxidized);
  box-shadow: 0 0 14px rgba(83, 217, 197, 0.7);
}

.instrument-process {
  padding: 120px clamp(22px, 7vw, 108px) 140px;
  border-bottom: 1px solid var(--line);
}

.instrument-process header {
  display: grid;
  grid-template-columns: 1fr 2fr;
  align-items: end;
  margin-bottom: 70px;
}

.instrument-process header p {
  margin: 0;
  color: var(--oxidized);
  font: 600 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.15em;
}

.instrument-process h2,
.record-copy h2,
.instrument-start h2 {
  margin: 0;
  font: 400 clamp(36px, 4vw, 64px)/1.18 "Yu Mincho", "Hiragino Mincho ProN", Georgia, serif;
  letter-spacing: -0.035em;
}

.instrument-process ol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.instrument-process li {
  min-height: 280px;
  padding: 24px clamp(18px, 2vw, 32px);
  border-right: 1px solid var(--line);
  transition: background-color 180ms ease;
}

.instrument-process li:first-child {
  border-left: 1px solid var(--line);
}

.instrument-process li:hover {
  background: rgba(83, 217, 197, 0.04);
}

.instrument-process li b {
  color: var(--copper);
  font: 500 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.instrument-process li h3 {
  margin: 88px 0 18px;
  font: 500 22px/1.2 "Yu Mincho", "Hiragino Mincho ProN", serif;
}

.instrument-process li p {
  margin: 0;
  color: #aaa69d;
  font-size: 13px;
  line-height: 1.75;
}

.instrument-record {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(380px, 1fr);
  min-height: 760px;
  border-bottom: 1px solid var(--line);
}

.record-visual {
  position: relative;
  min-height: 620px;
  overflow: hidden;
  border-right: 1px solid var(--line);
  background:
    radial-gradient(circle at 50% 50%, rgba(83, 217, 197, 0.08), transparent 46%),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 7px);
}

.record-visual > p {
  position: absolute;
  top: 30px;
  left: 34px;
  color: #77756f;
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.record-rings {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(60%, 410px);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
}

.record-rings i {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(231, 225, 212, 0.28);
  border-radius: 50%;
}

.record-rings i:nth-child(2) {
  inset: 17%;
  border-color: rgba(83, 217, 197, 0.52);
}

.record-rings i:nth-child(3) {
  inset: 38%;
  border-color: rgba(189, 122, 82, 0.7);
  background: #101614;
}

.record-scanline {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 9%;
  width: 82%;
  height: 1px;
  background: var(--oxidized);
  box-shadow: 0 0 28px 8px rgba(83, 217, 197, 0.16);
  animation: scanRecord 5s ease-in-out infinite;
}

.record-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 90px clamp(30px, 6vw, 100px);
}

.record-copy > p:last-child {
  max-width: 560px;
  margin: 30px 0 0;
  color: #aaa69d;
  font-size: 15px;
  line-height: 1.9;
}

.instrument-start {
  display: flex;
  min-height: 520px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--bone);
  color: #111412;
}

.instrument-start > p {
  margin: 0 0 26px;
  color: #4f615c;
  font: 600 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.17em;
}

.instrument-start a {
  display: inline-flex;
  min-width: 250px;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  margin-top: 44px;
  padding: 0 22px;
  color: var(--bone);
  background: #111412;
  font-size: 13px;
}

/* ================================================================
   02 — LIVING ARCHIVE
   ================================================================ */

.concept-archive {
  --paper: #e7dfcf;
  --paper-dark: #d6cbb7;
  --archive-ink: #1b1a17;
  --red: #9e2f22;
  --archive-line: rgba(27, 26, 23, 0.35);
  color: var(--archive-ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(rgba(27, 26, 23, 0.10) 0.6px, transparent 0.8px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.25), transparent 30% 70%, rgba(0, 0, 0, 0.03));
  background-size: 5px 5px, 100% 100%;
}

.archive-nav {
  position: sticky;
  z-index: 50;
  top: var(--study-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 76px;
  padding: 0 clamp(20px, 4vw, 60px);
  border-bottom: 1px solid var(--archive-ink);
  background: rgba(231, 223, 207, 0.9);
  backdrop-filter: blur(12px);
}

.archive-brand {
  font: 700 24px/1 Georgia, serif;
  letter-spacing: 0.08em;
}

.archive-brand small {
  margin-left: 10px;
  font: 500 11px/1 "Yu Mincho", serif;
  letter-spacing: 0.18em;
}

.archive-nav p {
  margin: 0;
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.16em;
}

.archive-nav > a:last-child {
  justify-self: end;
  display: grid;
  min-width: 110px;
  min-height: 44px;
  place-items: center;
  color: var(--paper);
  background: var(--archive-ink);
  font-size: 12px;
}

.archive-hero {
  position: relative;
  display: grid;
  grid-template-columns: 72px minmax(360px, 1.05fr) 56px minmax(360px, 0.95fr);
  min-height: calc(100svh - var(--study-h) - 76px);
  padding: 52px clamp(24px, 5vw, 84px) 60px 0;
  border-bottom: 1px solid var(--archive-ink);
}

.archive-margin {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 0 0 18px;
  border-right: 1px solid var(--archive-line);
}

.archive-margin span {
  writing-mode: vertical-rl;
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.14em;
}

.archive-margin b {
  font: 600 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  transform: rotate(-90deg);
}

.archive-title-block {
  align-self: center;
  padding: 20px clamp(26px, 5vw, 84px);
}

.archive-overline {
  margin: 0 0 36px;
  font: 700 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.13em;
}

.archive-title-block h1 {
  margin: 0;
  font: 500 clamp(64px, 8vw, 126px)/0.91 "Yu Mincho", "Hiragino Mincho ProN", Georgia, serif;
  letter-spacing: -0.07em;
}

.archive-title-block h1 span {
  color: var(--red);
}

.archive-intro {
  max-width: 560px;
  margin: 42px 0 0;
  font: 500 clamp(15px, 1.3vw, 18px)/2 "Yu Mincho", "Hiragino Mincho ProN", serif;
}

.archive-actions {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 42px;
}

.archive-actions a {
  display: grid;
  min-height: 52px;
  place-items: center;
  font-size: 12px;
}

.archive-actions a:first-child {
  min-width: 190px;
  color: var(--paper);
  background: var(--red);
}

.archive-actions a:last-child {
  border-bottom: 1px solid var(--archive-ink);
}

.archive-vertical {
  align-self: center;
  justify-self: center;
  writing-mode: vertical-rl;
  font: 500 11px/2 "Yu Mincho", serif;
  letter-spacing: 0.28em;
}

.archive-plate {
  align-self: center;
  width: min(100%, 520px);
  margin: 0;
}

.archive-plate svg {
  width: 100%;
  max-height: 68svh;
}

.archive-plate rect,
.archive-plate path,
.archive-plate circle,
.archive-plate line {
  fill: none;
  stroke: var(--archive-ink);
  stroke-width: 1.25;
  vector-effect: non-scaling-stroke;
}

.archive-plate path:nth-of-type(2) {
  stroke: var(--red);
  stroke-width: 2;
}

.archive-plate text {
  fill: var(--archive-ink);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
}

.archive-plate figcaption {
  margin-top: 12px;
  font: 500 11px/1.5 "Yu Mincho", serif;
}

.archive-stamp {
  position: absolute;
  right: clamp(24px, 4vw, 64px);
  bottom: 32px;
  display: grid;
  width: 106px;
  height: 106px;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  padding: 12px;
  color: var(--red);
  border: 2px solid var(--red);
  border-radius: 50%;
  transform: rotate(-9deg);
}

.archive-stamp span {
  font: 700 44px/1 "Yu Mincho", serif;
}

.archive-stamp small {
  font: 700 7px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.archive-manifesto {
  display: grid;
  grid-template-columns: 90px minmax(400px, 2fr) minmax(240px, 0.8fr);
  min-height: 680px;
  border-bottom: 1px solid var(--archive-ink);
}

.archive-section-number {
  padding-top: 46px;
  text-align: center;
  border-right: 1px solid var(--archive-line);
  font: 500 30px/1 "Yu Mincho", serif;
}

.archive-quote {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 70px clamp(30px, 7vw, 120px);
}

.archive-quote p {
  margin: 0;
  font: 500 clamp(30px, 4.4vw, 70px)/1.5 "Yu Mincho", "Hiragino Mincho ProN", serif;
  letter-spacing: -0.045em;
}

.archive-quote p + p {
  margin-top: 60px;
  color: var(--red);
}

.archive-manifesto aside {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 60px 44px;
  border-left: 1px solid var(--archive-line);
}

.archive-manifesto aside b {
  font: 700 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.12em;
}

.archive-manifesto aside p {
  margin: 18px 0 0;
  font: 500 13px/1.9 "Yu Mincho", serif;
}

.archive-index {
  display: grid;
  grid-template-columns: minmax(300px, 0.9fr) minmax(540px, 1.6fr);
  min-height: 720px;
  border-bottom: 1px solid var(--archive-ink);
}

.archive-index > header {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 72px clamp(30px, 6vw, 90px);
  border-right: 1px solid var(--archive-line);
}

.archive-index > header p {
  margin: 0;
  font: 700 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.14em;
}

.archive-index h2 {
  margin: 0;
  font: 500 clamp(44px, 5vw, 78px)/1.3 "Yu Mincho", serif;
  letter-spacing: -0.045em;
}

.archive-index-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.archive-index-list article {
  position: relative;
  min-height: 360px;
  padding: 40px;
  border-right: 1px solid var(--archive-line);
  border-bottom: 1px solid var(--archive-line);
  transition: color 180ms ease, background-color 180ms ease;
}

.archive-index-list article:nth-child(even) {
  border-right: 0;
}

.archive-index-list article:nth-child(n + 3) {
  border-bottom: 0;
}

.archive-index-list article:hover {
  color: var(--paper);
  background: var(--red);
}

.archive-index-list b {
  font: 700 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.archive-index-list h3 {
  margin: 80px 0 14px;
  font: 500 44px/1 "Yu Mincho", serif;
}

.archive-index-list p {
  margin: 0;
  font: 500 14px/1.8 "Yu Mincho", serif;
}

.archive-index-list span {
  position: absolute;
  right: 22px;
  bottom: 22px;
  font: 700 8px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.14em;
}

.archive-start {
  display: grid;
  min-height: 580px;
  place-items: center;
  align-content: center;
  text-align: center;
  color: var(--paper);
  background: var(--archive-ink);
}

.archive-start p {
  margin: 0 0 28px;
  color: #a49c8e;
  font: 700 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.15em;
}

.archive-start h2 {
  margin: 0;
  font: 500 clamp(44px, 5vw, 76px)/1.35 "Yu Mincho", serif;
}

.archive-start a {
  display: grid;
  min-width: 220px;
  min-height: 56px;
  place-items: center;
  margin-top: 44px;
  color: var(--paper);
  border: 1px solid var(--red);
  background: var(--red);
  font-size: 13px;
}

/* ================================================================
   03 — BLACK MONOLITH
   ================================================================ */

.concept-monolith {
  --black: #060606;
  --chalk: #ece9df;
  --acid: #d8ff43;
  --monolith-line: rgba(236, 233, 223, 0.2);
  color: var(--chalk);
  background: var(--black);
}

.monolith-progress {
  position: fixed;
  z-index: 70;
  top: var(--study-h);
  left: 0;
  width: 100%;
  height: 2px;
  pointer-events: none;
  background: rgba(255, 255, 255, 0.08);
}

.monolith-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--acid);
}

.monolith-nav {
  position: sticky;
  z-index: 50;
  top: var(--study-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 80px;
  padding: 0 clamp(20px, 5vw, 80px);
  border-bottom: 1px solid var(--monolith-line);
  background: rgba(6, 6, 6, 0.84);
  backdrop-filter: blur(18px);
}

.monolith-brand {
  font: 700 24px/1 Georgia, serif;
  letter-spacing: 0.1em;
}

.monolith-nav p {
  margin: 0;
  color: #9b9992;
  text-align: center;
  font: 700 7px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.2em;
}

.monolith-nav > a:last-child {
  justify-self: end;
  display: grid;
  min-height: 44px;
  place-items: center;
  padding: 0 18px;
  color: var(--black);
  background: var(--acid);
  font: 700 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.monolith-hero {
  position: relative;
  min-height: calc(100svh - var(--study-h) - 80px);
  overflow: hidden;
  border-bottom: 1px solid var(--monolith-line);
  background:
    linear-gradient(90deg, transparent calc(50% - 1px), rgba(255, 255, 255, 0.08) 50%, transparent calc(50% + 1px));
}

.monolith-index {
  position: absolute;
  top: 38px;
  left: clamp(22px, 5vw, 80px);
  margin: 0;
  color: #9a978f;
  font: 700 9px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.17em;
}

.monolith-hero h1 {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: -0.035em;
  width: 100%;
  margin: 0;
  transform: translateY(-57%);
  font: 600 clamp(84px, 15vw, 240px)/0.78 "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  letter-spacing: -0.095em;
  text-transform: uppercase;
}

.monolith-hero h1 span {
  display: block;
  white-space: nowrap;
}

.monolith-hero h1 span:last-child {
  margin-left: 17vw;
  color: transparent;
  -webkit-text-stroke: 1px rgba(236, 233, 223, 0.66);
}

.monolith-object {
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 57%;
  width: min(29vw, 420px);
  height: min(67vh, 670px);
  perspective: 1100px;
  transform: translate(-50%, -48%);
}

.monolith-slab {
  position: absolute;
  inset: 0;
  background: #11110f;
}

.monolith-slab.front {
  clip-path: polygon(6% 6%, 88% 0, 96% 93%, 0 100%);
  background:
    linear-gradient(120deg, rgba(255, 255, 255, 0.08), transparent 34%),
    repeating-linear-gradient(103deg, #11110f 0 3px, #0b0b0a 3px 7px);
  transform: rotateY(-8deg) rotateZ(1deg);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
}

.monolith-slab.side {
  left: 82%;
  width: 18%;
  clip-path: polygon(0 0, 100% 8%, 100% 86%, 44% 93%);
  background: #181815;
  transform: rotateY(28deg);
  transform-origin: left center;
}

.monolith-light {
  position: absolute;
  z-index: 3;
  top: 2%;
  left: 48%;
  width: 2px;
  height: 93%;
  background: var(--acid);
  box-shadow: 0 0 35px 9px rgba(216, 255, 67, 0.2), 0 0 120px 28px rgba(216, 255, 67, 0.08);
  transform: rotate(1deg);
}

.monolith-shadow {
  position: absolute;
  z-index: -1;
  right: -100%;
  bottom: -12%;
  width: 190%;
  height: 28%;
  background: linear-gradient(90deg, rgba(216, 255, 67, 0.22), transparent 70%);
  filter: blur(30px);
  transform: skewX(-33deg) rotate(-4deg);
  opacity: 0.5;
}

.monolith-lead {
  position: absolute;
  z-index: 5;
  right: clamp(24px, 6vw, 100px);
  bottom: 110px;
  width: min(380px, 30vw);
  margin: 0;
  color: #aaa8a0;
  font-size: 14px;
  line-height: 1.9;
}

.monolith-enter {
  position: absolute;
  z-index: 5;
  right: clamp(24px, 6vw, 100px);
  bottom: 32px;
  display: flex;
  width: min(380px, 30vw);
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px 0 22px;
  color: var(--black);
  background: var(--acid);
  font-size: 13px;
  font-weight: 700;
}

.monolith-enter b {
  font-size: 22px;
}

.monolith-ticker {
  display: flex;
  overflow: hidden;
  min-height: 92px;
  align-items: center;
  color: var(--black);
  background: var(--acid);
  font: 800 22px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: -0.04em;
  white-space: nowrap;
}

.monolith-ticker div {
  flex: 0 0 auto;
  padding-right: 1em;
  animation: ticker 20s linear infinite;
}

.monolith-statement {
  min-height: 800px;
  padding: 110px clamp(24px, 7vw, 110px);
  border-bottom: 1px solid var(--monolith-line);
}

.monolith-label {
  margin: 0 0 150px;
  color: var(--acid);
  font: 700 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.17em;
}

.monolith-statement h2 {
  margin: 0;
  font: 600 clamp(48px, 7vw, 110px)/1.08 "Yu Gothic", "Hiragino Kaku Gothic ProN", sans-serif;
  letter-spacing: -0.065em;
}

.monolith-statement h2 em {
  color: var(--acid);
  font-style: normal;
}

.monolith-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 340px));
  justify-content: end;
  gap: 60px;
  margin-top: 120px;
}

.monolith-columns p {
  margin: 0;
  color: #aaa79f;
  font-size: 14px;
  line-height: 1.9;
}

.monolith-sequence {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--monolith-line);
}

.monolith-sequence article {
  min-height: 400px;
  padding: 30px;
  border-right: 1px solid var(--monolith-line);
}

.monolith-sequence article:last-child {
  border-right: 0;
}

.monolith-sequence span {
  color: var(--acid);
  font: 700 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.monolith-sequence h3 {
  margin: 220px 0 12px;
  font: 700 clamp(24px, 3vw, 48px)/1 "Helvetica Neue", sans-serif;
  letter-spacing: -0.05em;
}

.monolith-sequence p {
  margin: 0;
  color: #aaa79f;
  font-size: 13px;
}

.monolith-start {
  position: relative;
  display: flex;
  min-height: 760px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  color: var(--black);
  background: var(--chalk);
  text-align: center;
}

.monolith-start-mark {
  position: absolute;
  top: 50%;
  left: 50%;
  color: rgba(6, 6, 6, 0.045);
  font: italic 700 700px/1 Georgia, serif;
  transform: translate(-50%, -50%);
}

.monolith-start > p,
.monolith-start h2,
.monolith-start > div:last-child {
  position: relative;
  z-index: 2;
}

.monolith-start > p {
  margin: 0 0 30px;
  font: 700 10px/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: 0.18em;
}

.monolith-start h2 {
  margin: 0;
  font: 600 clamp(50px, 6vw, 92px)/1.15 "Yu Gothic", sans-serif;
  letter-spacing: -0.055em;
}

.monolith-start > div:last-child {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 54px;
}

.monolith-start a {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
}

.monolith-start a:first-child {
  width: 250px;
  padding: 0 20px;
  color: var(--black);
  background: var(--acid);
}

.monolith-start a:last-child {
  border-bottom: 1px solid var(--black);
}

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

@keyframes instrumentPulse {
  0%, 100% { opacity: 0.65; transform: scale(0.72); }
  50% { opacity: 1; transform: scale(1.15); }
}

@keyframes scanRecord {
  0%, 100% { top: 12%; opacity: 0; }
  15%, 85% { opacity: 1; }
  50% { top: 88%; }
}

@keyframes ticker {
  to { transform: translateX(-100%); }
}

@media (max-width: 980px) {
  .study-bar {
    grid-template-columns: 1fr auto;
  }

  .study-mark {
    display: none;
  }

  .concept-tabs {
    justify-self: start;
  }

  .instrument-copy {
    width: min(580px, 52vw);
  }

  .instrument-device {
    right: -150px;
    width: 62vw;
    opacity: 0.72;
  }

  .instrument-process ol,
  .monolith-sequence {
    grid-template-columns: repeat(2, 1fr);
  }

  .instrument-process li:nth-child(2) {
    border-right: 1px solid var(--line);
  }

  .instrument-process li:nth-child(-n + 2),
  .monolith-sequence article:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .instrument-record {
    grid-template-columns: 1fr;
  }

  .record-visual {
    min-height: 560px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .archive-hero {
    grid-template-columns: 54px 1fr 46px;
    padding-right: 0;
  }

  .archive-plate {
    grid-column: 2 / 3;
    width: min(76%, 500px);
    margin: 40px auto 20px;
  }

  .archive-stamp {
    right: 26px;
  }

  .archive-manifesto {
    grid-template-columns: 64px 1fr;
  }

  .archive-manifesto aside {
    grid-column: 2;
    padding: 0 40px 60px;
    border-left: 0;
  }

  .archive-index {
    grid-template-columns: 1fr;
  }

  .archive-index > header {
    min-height: 380px;
    border-right: 0;
    border-bottom: 1px solid var(--archive-line);
  }

  .monolith-object {
    left: 63%;
    width: 38vw;
  }

  .monolith-hero h1 {
    font-size: 16vw;
  }
}

@media (max-width: 700px) {
  :root {
    --study-h: 64px;
  }

  .study-bar {
    grid-template-columns: 1fr auto;
    padding: 0 10px;
  }

  .concept-tabs {
    gap: 2px;
    width: 100%;
    border: 0;
    border-radius: 0;
    background: transparent;
  }

  .concept-tab {
    min-width: 44px;
    padding: 0 10px;
    border-radius: 0;
    font-size: 0;
  }

  .concept-tab span {
    margin: 0;
    font-size: 11px;
  }

  .notes-toggle {
    padding: 0 12px;
    font-size: 11px;
  }

  .instrument-nav,
  .archive-nav,
  .monolith-nav {
    min-height: 64px;
  }

  .instrument-nav,
  .monolith-nav {
    padding: 0 18px;
  }

  .instrument-links a:not(.nav-cta) {
    display: none;
  }

  .instrument-links .nav-cta {
    min-height: 44px;
  }

  .instrument-hero {
    min-height: calc(100svh - var(--study-h) - 64px);
    padding-bottom: 54px;
  }

  .instrument-copy {
    position: relative;
    top: auto;
    left: auto;
    width: auto;
    padding: 64px 22px 390px;
    transform: none;
  }

  .instrument-eyebrow {
    margin-bottom: 24px;
    font-size: 8px;
  }

  .instrument-copy h1 {
    font-size: clamp(48px, 15vw, 72px);
  }

  .instrument-copy h1 em {
    -webkit-text-stroke-width: 0.75px;
  }

  .instrument-lead {
    margin-top: 26px;
    font-size: 15px;
    line-height: 1.8;
  }

  .instrument-actions {
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
    margin-top: 30px;
  }

  .instrument-primary {
    width: 100%;
  }

  .instrument-secondary {
    width: 100%;
    border: 1px solid var(--line);
  }

  .instrument-device {
    top: auto;
    right: 50%;
    bottom: 30px;
    width: 480px;
    max-width: 126vw;
    transform: translateX(50%);
  }

  .instrument-status {
    justify-content: space-between;
    gap: 8px;
    padding: 0 14px;
    font-size: 7px;
  }

  .instrument-process {
    padding: 78px 20px 90px;
  }

  .instrument-process header {
    grid-template-columns: 1fr;
    gap: 26px;
    margin-bottom: 44px;
  }

  .instrument-process h2,
  .record-copy h2,
  .instrument-start h2 {
    font-size: 38px;
  }

  .instrument-process ol {
    grid-template-columns: 1fr;
  }

  .instrument-process li,
  .instrument-process li:first-child {
    min-height: 220px;
    border: 1px solid var(--line);
    border-bottom: 0;
  }

  .instrument-process li:last-child {
    border-bottom: 1px solid var(--line);
  }

  .instrument-process li h3 {
    margin-top: 54px;
  }

  .record-visual {
    min-height: 460px;
  }

  .record-copy {
    padding: 80px 22px 96px;
  }

  .instrument-start {
    min-height: 480px;
    padding: 70px 22px;
  }

  .archive-nav {
    grid-template-columns: 1fr auto;
    padding: 0 18px;
  }

  .archive-brand small,
  .archive-nav p {
    display: none;
  }

  .archive-hero {
    grid-template-columns: 36px minmax(0, 1fr);
    padding: 28px 18px 60px 0;
  }

  .archive-margin {
    grid-row: 1 / 4;
  }

  .archive-title-block {
    padding: 28px 0 16px 22px;
  }

  .archive-title-block h1 {
    font-size: clamp(58px, 19vw, 82px);
    line-height: 0.98;
  }

  .archive-overline {
    font-size: 8px;
  }

  .archive-intro {
    margin-top: 32px;
    font-size: 14px;
    line-height: 1.9;
  }

  .archive-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin-top: 34px;
  }

  .archive-actions a:first-child {
    width: 100%;
  }

  .archive-vertical {
    display: none;
  }

  .archive-plate {
    grid-column: 2;
    width: calc(100% - 22px);
    margin: 40px 0 0 22px;
  }

  .archive-stamp {
    right: 24px;
    bottom: 38px;
    width: 82px;
    height: 82px;
  }

  .archive-stamp span {
    font-size: 34px;
  }

  .archive-manifesto {
    grid-template-columns: 42px 1fr;
    min-height: 650px;
  }

  .archive-section-number {
    padding-top: 30px;
    font-size: 22px;
  }

  .archive-quote {
    padding: 70px 22px;
  }

  .archive-quote p {
    font-size: 30px;
    line-height: 1.6;
  }

  .archive-quote p + p {
    margin-top: 40px;
  }

  .archive-manifesto aside {
    padding: 0 22px 60px;
  }

  .archive-index > header {
    min-height: 330px;
    padding: 52px 24px;
  }

  .archive-index h2 {
    font-size: 46px;
  }

  .archive-index-list {
    grid-template-columns: 1fr;
  }

  .archive-index-list article,
  .archive-index-list article:nth-child(even),
  .archive-index-list article:nth-child(n + 3) {
    min-height: 260px;
    border-right: 0;
    border-bottom: 1px solid var(--archive-line);
  }

  .archive-index-list article:last-child {
    border-bottom: 0;
  }

  .archive-index-list h3 {
    margin-top: 55px;
  }

  .archive-start {
    min-height: 500px;
    padding: 72px 22px;
  }

  .archive-start h2 {
    font-size: 42px;
  }

  .monolith-nav {
    grid-template-columns: 1fr auto;
  }

  .monolith-nav p {
    display: none;
  }

  .monolith-hero {
    min-height: calc(100svh - var(--study-h) - 64px);
  }

  .monolith-hero h1 {
    top: 28%;
    left: -0.03em;
    font-size: 24vw;
    line-height: 0.84;
    transform: none;
  }

  .monolith-hero h1 span:last-child {
    margin-left: 6vw;
  }

  .monolith-object {
    top: 60%;
    left: 48%;
    width: 56vw;
    height: 45vh;
  }

  .monolith-lead {
    right: 22px;
    bottom: 95px;
    width: calc(100% - 44px);
    font-size: 13px;
  }

  .monolith-enter {
    right: 22px;
    bottom: 22px;
    width: calc(100% - 44px);
  }

  .monolith-ticker {
    min-height: 72px;
    font-size: 16px;
  }

  .monolith-statement {
    min-height: 700px;
    padding: 76px 22px;
  }

  .monolith-label {
    margin-bottom: 110px;
  }

  .monolith-statement h2 {
    font-size: 49px;
  }

  .monolith-columns {
    grid-template-columns: 1fr;
    gap: 28px;
    margin-top: 90px;
  }

  .monolith-sequence {
    grid-template-columns: 1fr 1fr;
  }

  .monolith-sequence article {
    min-height: 260px;
    padding: 22px;
  }

  .monolith-sequence article:nth-child(2) {
    border-right: 0;
  }

  .monolith-sequence article:nth-child(-n + 2) {
    border-bottom-color: var(--monolith-line);
  }

  .monolith-sequence h3 {
    margin-top: 130px;
    font-size: 24px;
  }

  .monolith-start {
    min-height: 620px;
    padding: 80px 22px;
  }

  .monolith-start-mark {
    font-size: 500px;
  }

  .monolith-start h2 {
    font-size: 48px;
  }

  .monolith-start > div:last-child {
    width: 100%;
    flex-direction: column;
    gap: 8px;
  }

  .monolith-start a:first-child,
  .monolith-start a:last-child {
    width: 100%;
    justify-content: center;
  }

  .monolith-start a:first-child {
    justify-content: space-between;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}