:root {
  --paper: #f6f5f1;
  --surface: #fcfbf8;
  --ink: #171817;
  --muted: #777773;
  --line: #deddd7;
  --copper: #ad765a;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif; }
img { max-width: 100%; }
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--copper); outline-offset: 5px; }
.skip-link { position: absolute; top: -60px; left: 16px; z-index: 30; padding: 12px 16px; background: var(--ink); color: white; }
.skip-link:focus { top: 12px; }
.wrap { width: min(1440px, calc(100% - 96px)); margin-inline: auto; }
.section-pad { padding-block: clamp(100px, 12vw, 190px); }

.site-header { position: relative; z-index: 10; background: rgba(246,245,241,.92); border-bottom: 1px solid rgba(222,221,215,.5); }
.header-inner { height: 110px; display: grid; grid-template-columns: 340px 1fr auto; gap: 36px; align-items: center; }
.logo-link { display: flex; align-items: center; width: 320px; height: 110px; overflow: hidden; }
.logo-link img { display: block; flex: none; width: 320px; height: auto; transform:none; }
.main-nav { display: flex; align-items: center; justify-content: center; gap: clamp(20px, 3vw, 50px); }
.main-nav a { color: #535450; text-decoration: none; font-size: 14px; font-weight: 550; transition: color .2s ease; }
.main-nav a:hover { color: var(--ink); }
.header-action { justify-self: end; display: inline-flex; align-items: center; gap: 25px; padding: 13px 19px 13px 21px; border-radius: 100px; background: var(--ink); color: var(--surface); font-size: 13px; font-weight: 600; text-decoration: none; transition: transform .2s ease, background .2s ease; }
.header-action:hover { transform: translateY(-2px); background: #3e403c; }
.header-action span { font-size: 18px; font-weight: 400; }

.hero { position: relative; min-height: min(900px, calc(100dvh - 110px)); padding-top: 29px; display: flex; flex-direction: column; }
.hero-topline, .hero-footerline { display: flex; justify-content: space-between; gap: 30px; color: #646560; font-family: Consolas, "Courier New", monospace; font-size: 11px; font-weight: 600; letter-spacing: .13em; }
.hero-visual { position: relative; flex: 1; min-height: 460px; isolation: isolate; }
.instrument { position: absolute; z-index: 2; width: min(760px, 59vw); height: auto; left: 50%; top: 46%; transform: translate(-50%, -50%); filter: drop-shadow(0 22px 18px rgba(82,66,46,.08)); animation: object-enter 900ms cubic-bezier(.2,.8,.2,1) both; }
.orbit { position: absolute; left: 50%; top: 45%; border: 1px solid rgba(143,137,127,.18); border-radius: 50%; transform: translate(-50%,-50%); pointer-events: none; }
.orbit-outer { width: min(820px, 68vw); aspect-ratio: 1; }
.orbit-inner { width: min(590px, 48vw); aspect-ratio: 1; border-color: rgba(143,137,127,.1); }
.orbit-cross { position: absolute; top: 45%; color: #b0ada6; font: 18px Consolas, monospace; }
.orbit-cross-left { left: 21%; }
.orbit-cross-right { right: 21%; }
.annotation { position: absolute; z-index: 3; display: flex; align-items: center; gap: 15px; max-width: 220px; font-size: 12px; line-height: 1.45; }
.annotation b { display: block; font-family: Consolas, "Courier New", monospace; font-size: 10px; letter-spacing: .16em; }
.annotation small { display: block; margin-top: 5px; color: #6f716d; font-size: 12px; }
.annotation-dot { display: block; flex: none; width: 8px; height: 8px; background: var(--copper); border: 3px solid var(--paper); border-radius: 50%; box-shadow: 0 0 0 1px var(--copper); }
.annotation-left { top: 52%; left: 4%; }
.annotation-left::before { content: ""; position: absolute; width: clamp(70px, 12vw, 190px); height: 1px; right: calc(100% + 13px); background: #c6c4bd; display: none; }
.annotation-right { top: 29%; right: 2%; }
.annotation-right::before { content: ""; position: absolute; height: 1px; width: clamp(50px, 9vw, 135px); right: calc(100% + 12px); top: 5px; background: #c6c4bd; }
.hero-axis { position: absolute; z-index: 3; left: 50%; bottom: 30px; width: min(650px, 55vw); transform: translateX(-50%); display: flex; justify-content: space-between; color: #a6a39e; font: 10px Consolas, "Courier New", monospace; letter-spacing: .15em; }
.hero-bottom { position: relative; z-index: 4; display: grid; grid-template-columns: minmax(0, 1.8fr) minmax(240px, .7fr); gap: 50px; align-items: end; margin-top: -135px; }
.hero h1 { font-family: Arial, "Helvetica Neue", sans-serif; font-size: clamp(68px, 7.45vw, 122px); font-weight: 750; line-height: .88; letter-spacing: -.075em; margin: 0; white-space: nowrap; animation: title-enter 800ms 150ms ease both; }
.period { color: #855b45; }
.hero-aside { align-self: end; padding-bottom: 11px; max-width: 320px; }
.aside-rule { display: block; width: 42px; height: 2px; margin-bottom: 18px; background: var(--copper); }
.hero-aside p { margin: 0 0 26px; color: #51534f; font-size: 16px; line-height: 1.65; }
.hero-aside a { display: inline-flex; gap: 20px; padding-bottom: 8px; border-bottom: 1px solid var(--ink); font-size: 13px; font-weight: 650; text-decoration: none; }
.hero-aside a:hover { color: #855b45; border-color: var(--copper); }
.hero-footerline { margin-top: 54px; padding: 17px 0 22px; border-top: 1px solid var(--line); }

.section-index { display: flex; align-items: center; gap: 15px; margin: 0 0 55px; color: #646560; font: 11px Consolas, "Courier New", monospace; font-weight: 700; letter-spacing: .15em; }
.index-circle { display: inline-grid; place-items: center; width: 30px; height: 30px; border: 1px solid #bab9b2; border-radius: 50%; color: var(--ink); letter-spacing: 0; }
.index-line { width: 48px; height: 1px; background: #bcbab3; }
.statement { background: #ebeae5; }
.statement h2 { max-width: 1270px; margin: 0; font-size: clamp(46px, 5.55vw, 86px); font-weight: 500; letter-spacing: -.065em; line-height: 1.13; }
.statement h2 span { color: #7f807b; }
.statement-foot { display: flex; align-items: end; justify-content: space-between; gap: 60px; margin-top: 75px; }
.statement-foot p { max-width: 550px; margin: 0; color: #5e605a; font-size: 17px; line-height: 1.75; }
.statement-foot span { white-space: nowrap; color: #646560; font: 11px Consolas, "Courier New", monospace; letter-spacing: .14em; }

.chapters { background: var(--surface); }
.section-heading { display: grid; grid-template-columns: 1.6fr .65fr; gap: 70px; align-items: end; margin-bottom: 82px; }
.section-heading .section-index { margin-bottom: 35px; }
.section-heading h2, .method h2 { margin: 0; font-size: clamp(52px, 5.5vw, 86px); font-weight: 550; letter-spacing: -.067em; line-height: 1.04; }
.section-heading > p { max-width: 310px; margin: 0 0 6px; color: #63655f; font-size: 17px; line-height: 1.65; }
.chapter { display: grid; grid-template-columns: 150px minmax(0,1fr) 80px; gap: 24px; padding: 45px 0 53px; border-top: 1px solid #c9c9c2; }
.chapter:last-child { border-bottom: 1px solid #c9c9c2; }
.chapter-no { padding-top: 7px; color: #646560; font: 11px Consolas, "Courier New", monospace; letter-spacing: .14em; }
.chapter-kicker { margin: 0 0 10px; color: #855b45; font: 11px Consolas, "Courier New", monospace; font-weight: 700; letter-spacing: .13em; }
.chapter h3 { margin: 0 0 16px; font-size: clamp(50px, 5.8vw, 88px); font-weight: 540; letter-spacing: -.07em; line-height: 1; }
.chapter p:not(.chapter-kicker) { max-width: 600px; margin: 0; color: #555752; font-size: 17px; line-height: 1.65; }
.chapter-article-link { margin-top: 20px !important; }
.chapter-article-link a { display: inline-flex; gap: 14px; padding-bottom: 5px; border-bottom: 1px solid var(--ink); color: var(--ink); font-size: 14px; font-weight: 650; text-decoration: none; }
.chapter-article-link a + a { margin-left: 20px; }
.chapter-article-link a:hover { color: #855b45; border-color: var(--copper); }
.chapter-article-link span { color: #855b45; }
.chapter-topics { display: flex; flex-wrap: wrap; gap: 10px 23px; margin-top: 28px; }
.chapter-topics span { font-size: 12px; color: #646560; }
.chapter-topics span + span::before { content: "·"; margin-right: 23px; color: #855b45; }
.chapter-mark { justify-self: end; padding-top: 4px; color: #7c7b75; font-size: 31px; transition: transform .2s ease, color .2s ease; }
.chapter:hover .chapter-mark { color: #855b45; transform: translate(4px,-4px); }

.method { background: #e8e6df; }
.method-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(70px, 10vw, 160px); }
.method .section-index { margin-bottom: 45px; }
.method-lead { max-width: 500px; margin: 34px 0 0; color: #5d5f59; font-size: 18px; line-height: 1.72; }
.method-steps { list-style: none; padding: 0; margin: 18px 0 0; }
.method-steps li { display: grid; grid-template-columns: 55px 1fr; gap: 18px; padding: 28px 0 33px; border-top: 1px solid #bfbdB6; }
.method-steps li:last-child { border-bottom: 1px solid #bfbdB6; }
.method-steps li > span { padding-top: 5px; color: #855b45; font: 12px Consolas, "Courier New", monospace; letter-spacing: .1em; }
.method-steps h3 { margin: 0 0 10px; font-size: 24px; font-weight: 560; letter-spacing: -.035em; }
.method-steps p { max-width: 450px; margin: 0; color: #5d5f59; font-size: 15px; line-height: 1.7; }

.authors { background: var(--surface); }
.authors-heading { margin-bottom: 78px; }
.author-list { border-top: 1px solid #c7c7c0; }
.author-list > div { display: grid; grid-template-columns: 120px 1fr 260px; align-items: baseline; gap: 20px; padding: 30px 0; border-bottom: 1px solid #c7c7c0; }
.author-list span { color: #855b45; font: 12px Consolas, "Courier New", monospace; }
.author-list h3 { margin: 0; font-size: clamp(28px, 3vw, 45px); font-weight: 550; letter-spacing: -.05em; }
.author-list p { margin: 0; color: #646560; font-size: 14px; }

.footer { background: #e9e7e0; }
.footer-main { min-height: 190px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 50px; }
.footer-main p { margin: 0; font-size: 24px; line-height: 1.35; letter-spacing: -.04em; }
.footer-main > a:last-child { align-self: center; padding-bottom: 5px; border-bottom: 1px solid var(--ink); font-size: 13px; text-decoration: none; }
.footer-bottom { display: flex; justify-content: space-between; gap: 30px; padding: 22px 0 28px; border-top: 1px solid #cccac2; color: #646560; font: 10px Consolas, "Courier New", monospace; letter-spacing: .13em; }

@keyframes object-enter { from { opacity: 0; transform: translate(-50%, -46%) scale(.95); } to { opacity: 1; transform: translate(-50%, -50%) scale(1); } }
@keyframes title-enter { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 1120px) {
  .header-inner { height: 110px; grid-template-columns: 340px 1fr auto; gap: 20px; }
  .logo-link, .logo-link img { width: 320px; }
  .main-nav { gap: 18px; }
  .hero h1 { font-size: clamp(60px, 7vw, 85px); }
  .hero-bottom { gap: 25px; }
  .instrument { width: min(700px, 70vw); }
  .annotation-left { left: 0; }
  .annotation-right { right: 0; }
}

@media (max-width: 960px) {
  .header-inner { height: auto; grid-template-columns: 1fr auto; gap: 6px 20px; padding-block: 4px 10px; }
  .logo-link { height: 70px; }
  .main-nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; }
  .header-action { grid-column: 2; grid-row: 1; }
}

@media (max-width: 820px) {
  .wrap { width: min(100% - 48px, 720px); }
  .header-inner { height: auto; min-height: 80px; grid-template-columns: 1fr auto; gap: 0 18px; padding-block: 4px 10px; }
  .logo-link { width: 342px; height: 76px; }
  .logo-link img { width: 342px; }
  .main-nav { grid-column: 1 / -1; grid-row: 2; justify-content: flex-start; gap: 25px; padding-left: 2px; }
  .header-action { grid-column: 2; grid-row: 1; }
  .hero { min-height: 0; padding-top: 24px; }
  .hero-visual { min-height: 500px; }
  .instrument { width: min(700px, 96vw); top: 48%; }
  .orbit { top: 48%; }
  .orbit-outer { width: 89vw; }.orbit-inner { width: 65vw; }
  .annotation-left { top: 78%; left: 3%; }.annotation-right { top: 13%; right: 2%; }
  .annotation-right::before { width: 55px; }
  .hero-bottom { grid-template-columns: 1fr; margin-top: -30px; gap: 28px; }
  .hero h1 { font-size: clamp(54px, 10vw, 82px); }
  .hero-aside { display: grid; grid-template-columns: 2px minmax(0, 1fr); gap: 15px 20px; max-width: 530px; padding-bottom: 0; }
  .hero-aside .aside-rule { width: 2px; height: 100%; grid-row: span 2; margin: 0; }
  .hero-aside p { margin-bottom: 2px; }
  .hero-aside a { justify-self: start; }
  .hero-footerline { margin-top: 55px; }
  .section-heading, .method-grid { grid-template-columns: 1fr; gap: 35px; }
  .section-heading > p { max-width: 520px; }
  .chapter { grid-template-columns: 95px 1fr 36px; }
  .footer-main { padding-block: 35px; }
}

@media (max-width: 560px) {
  .wrap { width: calc(100% - 36px); }
  .header-inner { grid-template-columns: minmax(0, 1fr) auto; gap: 6px 10px; padding-block: 4px 9px; }
  .logo-link { grid-column: 1 / -1; grid-row: 1; width: 280px; height: 58px; }.logo-link img { width: 280px; }
  .header-action { grid-column: 2; grid-row: 2; gap: 0; padding: 10px 12px; font-size: 0; }.header-action span { font-size: 16px; }
  .main-nav { grid-column: 1; grid-row: 2; min-width: 0; gap: 14px; overflow-x: auto; padding-bottom: 3px; }.main-nav a { white-space: nowrap; font-size: 12px; }
  .hero-topline, .hero-footerline { font-size: 8px; letter-spacing: .07em; }
  .hero-topline span:last-child { text-align: right; }
  .hero-visual { min-height: 430px; overflow: clip; }
  .instrument { width: 118vw; max-width: none; top: 44%; }
  .orbit { top: 44%; }.orbit-outer { width: 105vw; }.orbit-inner { width: 75vw; }
  .orbit-cross, .hero-axis { display: none; }
  .annotation { gap: 9px; }.annotation b { font-size: 9px; }.annotation small { font-size: 10px; }
  .annotation-left { top: 83%; left: 0; }.annotation-right { top: 7%; right: 0; }
  .annotation-right::before { display: none; }
  .hero-bottom { margin-top: 0; }
  .hero h1 { font-size: clamp(42px, 11vw, 61px); letter-spacing: -.073em; }
  .hero-aside p { font-size: 15px; }
  .section-pad { padding-block: 90px; }
  .section-index { margin-bottom: 35px; font-size: 9px; gap: 10px; }
  .statement h2 { font-size: clamp(39px, 10vw, 58px); }
  .statement-foot { display: block; margin-top: 45px; }.statement-foot p { font-size: 15px; }.statement-foot span { display: block; margin-top: 36px; font-size: 9px; }
  .section-heading h2, .method h2 { font-size: clamp(45px, 11vw, 64px); }
  .section-heading { margin-bottom: 55px; }.section-heading > p { font-size: 15px; }
  .chapter { grid-template-columns: 1fr 30px; gap: 0; padding-block: 32px 40px; }.chapter-no { grid-column: 1/-1; padding: 0 0 27px; }.chapter h3 { font-size: clamp(50px, 12vw, 68px); }.chapter p:not(.chapter-kicker) { font-size: 15px; }.chapter-mark { font-size: 23px; }
  .chapter-topics { gap: 8px 13px; }.chapter-topics span { font-size: 11px; }.chapter-topics span + span::before { margin-right: 13px; }
  .method-lead { font-size: 16px; }.method-steps { margin-top: 6px; }
  .author-list > div { grid-template-columns: 35px 1fr; padding: 22px 0; }.author-list h3 { font-size: 27px; }.author-list p { grid-column: 2; }
  .footer-main { grid-template-columns: 1fr; gap: 12px; padding: 37px 0; }.footer-main > a:last-child { grid-column: 1; justify-self: start; margin-top: 15px; }.footer-main p { font-size: 21px; }
  .footer-bottom { display: block; line-height: 1.7; }.footer-bottom span { display: block; }.footer-bottom span + span { margin-top: 8px; }
}

@media (max-width: 340px) {
  .hero h1 { font-size: 37px; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }