:root {
  --ink: #11171d;
  --ink-soft: #1c2630;
  --paper: #f4f2ec;
  --paper-2: #e9e6de;
  --white: #fbfaf6;
  --blue: #2a66d9;
  --cyan: #71d4ea;
  --red: #db503e;
  --green: #2e8a69;
  --sand: #ded8ca;
  --muted: #5d6670;
  --line: rgba(17, 23, 29, .18);
  --line-light: rgba(255, 255, 255, .18);
  --max: 1320px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Pretendard, "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif; line-height: 1.65; text-rendering: optimizeLegibility; }
button, input { font: inherit; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; }
h1, h2, h3, p, dd { word-break: keep-all; overflow-wrap: break-word; }
h1, h2, h3 { text-wrap: balance; }

.skip { position: fixed; z-index: 100; left: 16px; top: -80px; padding: 11px 16px; color: #fff; background: #000; transition: top .2s; }
.skip:focus { top: 14px; }

.site-header { position: fixed; z-index: 50; inset: 0 0 auto; height: 72px; display: grid; grid-template-columns: 180px 1fr auto; align-items: center; gap: 42px; padding: 0 clamp(22px, 4vw, 64px); color: white; background: rgba(13, 20, 27, .94); border-bottom: 1px solid rgba(255,255,255,.16); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
.brand { width: 140px; }
.brand img { height: auto; }
.site-nav { display: flex; justify-content: center; gap: clamp(24px, 4vw, 56px); }
.site-nav a { position: relative; padding: 24px 0 20px; color: rgba(255,255,255,.58); font-size: 13px; font-weight: 680; transition: color .2s; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 13px; height: 2px; background: var(--cyan); transition: right .25s; }
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a.is-current { color: white; }
.site-nav a.is-current::after { right: 0; }
.project-mark { color: rgba(255,255,255,.45); font-size: 11px; font-weight: 700; letter-spacing: .1em; }
.header-actions { display: flex; align-items: center; justify-content: flex-end; gap: 20px; }
.language-toggle { min-width: 60px; height: 38px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0 12px; border: 1px solid rgba(255,255,255,.34); color: white; background: transparent; cursor: pointer; font-size: 11px; font-weight: 780; letter-spacing: .08em; transition: color .2s, background .2s, border-color .2s; }
.language-toggle i { font-style: normal; color: var(--cyan); transition: transform .25s; }
.language-toggle:hover, .language-toggle:focus-visible { color: var(--ink); background: var(--cyan); border-color: var(--cyan); }
.language-toggle:hover i, .language-toggle:focus-visible i { color: var(--ink); transform: rotate(45deg); }
.scroll-progress { position: absolute; inset: auto 0 0; height: 2px; background: rgba(255,255,255,.08); }
.scroll-progress i { display: block; width: 0; height: 100%; background: var(--cyan); }

.hero { min-height: 100svh; display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(440px, .96fr); grid-template-rows: 1fr auto; padding-top: 72px; background: var(--paper); }
.hero-copy { display: flex; flex-direction: column; justify-content: center; padding: clamp(80px, 10vw, 150px) clamp(28px, 6vw, 96px) clamp(60px, 7vw, 100px); transform: translate3d(0, var(--hero-copy-shift, 0), 0); will-change: transform; }
.overline, .chapter { margin: 0 0 24px; color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.hero h1 { max-width: 820px; display: grid; gap: .025em; margin: 0; font-size: clamp(54px, 5.35vw, 88px); line-height: 1.02; font-weight: 650; letter-spacing: -.06em; text-wrap: auto; }
.hero h1 > span { display: block; width: fit-content; }
.hero h1 .hero-key { padding-bottom: .13em; }
.hero h1 em { color: var(--blue); font-style: normal; background-image: linear-gradient(var(--blue), var(--blue)); background-repeat: no-repeat; background-position: 0 100%; background-size: 0 .055em; padding-bottom: .075em; transition: background-size .9s cubic-bezier(.2,.8,.2,1); }
.hero.is-ready h1 em { background-size: 100% .055em; }
.hero-summary { max-width: 700px; margin: 38px 0 0; color: #404a54; font-size: clamp(18px, 1.5vw, 23px); line-height: 1.7; letter-spacing: -.025em; }
.text-link { display: inline-flex; width: fit-content; align-items: center; gap: 18px; margin-top: 38px; padding-bottom: 8px; border-bottom: 1px solid currentColor; font-size: 14px; font-weight: 720; }
.text-link span, .text-link b { font-size: 18px; transition: transform .2s; }
.text-link:hover span, .text-link:hover b { transform: translate(3px, 3px); }
.hero-visual { position: relative; min-height: 680px; margin: 0; overflow: hidden; background: #0c1c2a; }
.hero-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 52%, rgba(3,9,15,.75)); pointer-events: none; }
.hero-visual img { height: 108%; object-fit: cover; object-position: 59% center; filter: saturate(.72) contrast(1.08); transform: translate3d(0, var(--hero-image-shift, -3%), 0) scale(1.035); will-change: transform; }
.hero-visual figcaption { position: absolute; z-index: 2; left: 28px; right: 28px; bottom: 25px; color: rgba(255,255,255,.7); font-size: 12px; }
.hero-index { position: absolute; z-index: 2; top: 30px; left: 30px; right: 30px; display: grid; grid-template-columns: auto 1fr auto 1fr auto; align-items: center; gap: 10px; color: white; font-size: 11px; font-weight: 750; letter-spacing: .08em; }
.hero-index i { position: relative; height: 1px; overflow: hidden; background: rgba(255,255,255,.25); }
.hero-index i::after { content: ""; position: absolute; inset: 0 100% 0 0; background: white; animation: index-line 3.8s ease-in-out infinite; }
.hero-index i:nth-of-type(2)::after { animation-delay: 1.3s; }
@keyframes index-line { 0%, 15% { right: 100%; left: 0; } 45%, 70% { right: 0; left: 0; } 100% { right: 0; left: 100%; } }
.hero-facts { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0 clamp(28px, 6vw, 96px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--white); }
.hero-facts div { min-height: 132px; padding: 28px 26px 24px 0; }
.hero-facts div + div { padding-left: 26px; border-left: 1px solid var(--line); }
.hero-facts dt { color: var(--muted); font-size: 12px; font-weight: 650; }
.hero-facts dd { margin: 14px 0 0; font-size: clamp(16px, 1.45vw, 21px); font-weight: 650; letter-spacing: -.025em; }

.section { padding: clamp(100px, 10vw, 160px) clamp(24px, 6vw, 96px); }
.project-brief { background: var(--white); border-bottom: 1px solid var(--line); }
.brief-heading { max-width: var(--max); margin: 0 auto clamp(52px, 6vw, 84px); display: grid; grid-template-columns: minmax(220px, .65fr) minmax(0, 1.35fr); align-items: end; gap: clamp(34px, 6vw, 100px); }
.brief-heading .chapter { margin-bottom: 14px; }
.brief-heading > div > span { color: var(--muted); font-size: 10px; font-weight: 720; letter-spacing: .11em; }
.brief-heading h2 { max-width: 880px; margin: 0; font-size: clamp(38px, 4.1vw, 60px); line-height: 1.18; font-weight: 630; letter-spacing: -.052em; }
.brief-grid { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.brief-card { position: relative; min-height: 310px; padding: clamp(28px, 3.5vw, 48px); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper); transition-delay: var(--brief-delay); }
.brief-card::before { content: ""; position: absolute; left: 0; top: -1px; width: 0; height: 4px; background: var(--blue); transition: width .7s cubic-bezier(.2,.8,.2,1); transition-delay: var(--brief-delay); }
.brief-card.is-visible::before { width: 100%; }
.brief-card > span { color: var(--blue); font-size: 12px; font-weight: 800; }
.brief-card h3 { max-width: 530px; margin: 42px 0 0; font-size: clamp(23px, 2.15vw, 31px); line-height: 1.35; font-weight: 650; letter-spacing: -.04em; }
.brief-card p { max-width: 550px; margin: 26px 0 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.brief-thesis { max-width: var(--max); margin: clamp(26px, 3vw, 42px) auto 0; display: grid; grid-template-columns: 170px 1fr; align-items: center; gap: 30px; padding: clamp(26px, 3.5vw, 44px); color: white; background: var(--ink); }
.brief-thesis > span { color: var(--cyan); font-size: 12px; font-weight: 800; }
.brief-thesis p { margin: 0; font-size: clamp(22px, 2.3vw, 32px); line-height: 1.45; letter-spacing: -.035em; }
.brief-thesis strong { color: var(--cyan); font-weight: 680; }
.section-head { max-width: var(--max); margin: 0 auto clamp(62px, 7vw, 96px); }
.section-head h2 { max-width: 1160px; margin: 0; font-size: clamp(42px, 4.35vw, 66px); line-height: 1.17; font-weight: 640; letter-spacing: -.052em; }
.section-head > p:last-child:not(.chapter) { max-width: 700px; margin: 30px 0 0; color: var(--muted); font-size: 18px; }
.reveal { opacity: .25; transform: translateY(24px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

.why { background: var(--paper); }
.why-sequence { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.why-sequence article { position: relative; min-height: 370px; padding: 34px clamp(24px, 3vw, 44px) 48px 0; }
.why-sequence article::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -1px; height: 3px; background: var(--blue); transition: right .5s ease; }
.why-sequence article:hover::after, .why-sequence article.is-reading::after { right: 0; }
.why-sequence article + article { padding-left: clamp(24px, 3vw, 44px); border-left: 1px solid var(--line); }
.why-sequence article > span { display: inline-block; color: var(--blue); font-size: 13px; font-weight: 780; }
.why-sequence h3 { margin: 70px 0 24px; font-size: clamp(24px, 2.4vw, 34px); line-height: 1.28; font-weight: 630; letter-spacing: -.045em; }
.why-sequence p { max-width: 380px; margin: 0; color: #515b65; font-size: 16px; line-height: 1.75; }
.research-question { max-width: var(--max); margin: clamp(68px, 8vw, 120px) auto 0; padding: clamp(36px, 5vw, 72px) 0 0 clamp(24px, 4vw, 64px); border-left: 5px solid var(--blue); transform: translate3d(0, var(--question-shift, 0), 0); will-change: transform; }
.research-question > span { color: var(--blue); font-size: 13px; font-weight: 800; }
.research-question p { max-width: 1160px; margin: 25px 0 20px; font-size: clamp(31px, 3.25vw, 50px); line-height: 1.36; font-weight: 480; letter-spacing: -.045em; text-wrap: balance; }
.research-question strong { font-weight: 720; }
.research-question small { display: block; max-width: 770px; color: var(--muted); font-size: 16px; line-height: 1.7; }

.section--ink { color: white; background: var(--ink); }
.section-head--light .chapter { color: var(--cyan); }
.section-head--light > p:last-child:not(.chapter) { color: rgba(255,255,255,.62); }
.method-story { max-width: var(--max); margin: 0 auto; display: grid; grid-template-columns: 250px minmax(0, 1fr); align-items: start; gap: clamp(34px, 5vw, 76px); }
.method-rail { position: sticky; z-index: 8; top: 110px; min-height: calc(100vh - 150px); display: flex; flex-direction: column; padding: 28px 0; border-top: 1px solid var(--line-light); border-bottom: 1px solid var(--line-light); }
.method-rail > p { margin: 0 0 26px; color: rgba(255,255,255,.42); font-size: 10px; font-weight: 780; letter-spacing: .13em; }
.method-rail-line { position: absolute; top: 76px; bottom: 35px; left: 10px; width: 1px; overflow: hidden; background: rgba(255,255,255,.14); }
.method-rail-line i { display: block; width: 100%; height: var(--method-progress, 0%); background: var(--cyan); transition: height .2s linear; }
.method-rail button { position: relative; min-height: 82px; display: grid; grid-template-columns: 42px 1fr; align-items: center; gap: 12px; padding: 10px 10px 10px 0; border: 0; color: rgba(255,255,255,.42); background: transparent; cursor: pointer; text-align: left; transition: color .25s, transform .25s; }
.method-rail button::before { content: ""; position: absolute; z-index: 2; left: 6px; top: 50%; width: 9px; height: 9px; border: 2px solid var(--ink); border-radius: 50%; background: #687580; transform: translateY(-50%); transition: width .25s, height .25s, left .25s, background .25s; }
.method-rail button b { padding-left: 28px; font-size: 11px; font-weight: 680; }
.method-rail button span { font-size: 15px; font-weight: 670; }
.method-rail button:hover, .method-rail button:focus-visible { color: white; transform: translateX(4px); }
.method-rail button.is-active { color: var(--cyan); }
.method-rail button.is-active::before { left: 2px; width: 17px; height: 17px; background: var(--cyan); }
.method-cards { position: relative; padding-bottom: max(92vh, 760px); }
.method-card { --card-lift: 84px; --card-scale: .975; position: sticky; top: 104px; z-index: 10; min-height: min(680px, calc(100vh - 148px)); display: flex; flex-direction: column; margin: 0 0 30vh; padding: clamp(34px, 5vw, 72px); overflow: hidden; color: white; background: #17232d; border: 1px solid rgba(255,255,255,.22); border-top: 3px solid rgba(113,212,234,.48); box-shadow: 0 28px 90px rgba(0,0,0,.3); transform: translate3d(0, var(--card-lift), 0) scale(var(--card-scale)); transform-origin: 50% 0; scroll-margin-top: 112px; transition: border-color .35s, background .35s, box-shadow .35s; will-change: transform; }
.method-card:nth-child(2) { top: 118px; z-index: 11; background: #162732; }
.method-card:nth-child(3) { top: 132px; z-index: 12; background: #1a2632; }
.method-card:nth-child(4) { top: 146px; z-index: 13; margin-bottom: 0; background: #142b2c; }
.method-card::before { content: attr(data-card-number); position: absolute; right: clamp(22px, 4vw, 58px); bottom: -0.28em; color: rgba(255,255,255,.028); font-size: clamp(170px, 20vw, 310px); font-weight: 780; line-height: 1; letter-spacing: -.08em; pointer-events: none; }
.method-card.is-active { border-color: rgba(113,212,234,.75); border-top-color: var(--cyan); box-shadow: 0 34px 110px rgba(0,0,0,.42), 0 0 0 1px rgba(113,212,234,.12); }
.method-card-top { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.card-signal { height: 30px; display: flex; align-items: flex-end; gap: 5px; }
.card-signal i { width: 3px; height: 7px; background: rgba(255,255,255,.25); transition: height .35s, background .35s; }
.card-signal i:nth-child(2) { height: 13px; }
.card-signal i:nth-child(3) { height: 20px; }
.card-signal i:nth-child(4) { height: 11px; }
.method-card.is-active .card-signal i { background: var(--cyan); animation: signal-rise 1.25s ease-in-out infinite alternate; }
.method-card.is-active .card-signal i:nth-child(2) { animation-delay: -.45s; }
.method-card.is-active .card-signal i:nth-child(3) { animation-delay: -.8s; }
.method-card.is-active .card-signal i:nth-child(4) { animation-delay: -.2s; }
@keyframes signal-rise { to { height: 28px; } }
.panel-number { margin: 0 0 24px; color: var(--cyan); font-size: 12px; font-weight: 780; letter-spacing: .11em; }
.method-card .panel-number { margin: 0; }
.method-card h3 { position: relative; z-index: 2; max-width: 850px; margin: clamp(52px, 7vh, 82px) 0 0; font-size: clamp(36px, 4.1vw, 60px); line-height: 1.16; font-weight: 600; letter-spacing: -.052em; }
.panel-lead { max-width: 880px; margin: 34px 0 0; color: rgba(255,255,255,.69); font-size: 18px; line-height: 1.82; }
.method-card .panel-lead { position: relative; z-index: 2; }
.method-card dl { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: auto 0 0; padding-top: 46px; border-top: 1px solid var(--line-light); }
.method-card dl div { padding: 0 28px 0 0; }
.method-card dl div + div { padding-left: 28px; border-left: 1px solid var(--line-light); }
.method-card dt { color: var(--cyan); font-size: 12px; font-weight: 760; }
.method-card dd { margin: 12px 0 0; color: rgba(255,255,255,.72); font-size: 15px; line-height: 1.7; }

.spatial { background: var(--white); }
.spatial-lab { max-width: var(--max); margin: 0 auto; border: 1px solid var(--ink); background: var(--paper); }
.lab-controls { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--ink); }
.lab-controls button { min-height: 82px; display: flex; align-items: center; gap: 16px; padding: 18px 26px; border: 0; border-right: 1px solid var(--line); color: var(--muted); background: transparent; cursor: pointer; font-size: 15px; font-weight: 680; text-align: left; transition: background .2s, color .2s; }
.lab-controls button:last-child { border-right: 0; }
.lab-controls button span { display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid currentColor; border-radius: 50%; font-size: 12px; }
.lab-controls button:hover, .lab-controls button:focus-visible { color: var(--ink); }
.lab-controls button.is-active { color: white; background: var(--blue); }
.lab-layout { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(420px, .98fr); min-height: 680px; }
.field-panel { padding: clamp(26px, 4vw, 52px); border-right: 1px solid var(--ink); }
.field-heading { display: flex; justify-content: space-between; gap: 18px; align-items: baseline; margin-bottom: 20px; }
.field-heading span { font-size: 16px; font-weight: 720; }
.field-heading small { color: var(--muted); font-size: 11px; }
.field-surface { position: relative; min-height: 500px; overflow: hidden; isolation: isolate; border: 1px solid rgba(255,255,255,.5); background: #082944; box-shadow: inset 0 0 80px rgba(1,11,21,.55), 0 20px 46px rgba(13,38,56,.12); transition: filter .65s, transform .2s ease-out; transform: perspective(1000px) rotateX(var(--field-rx, 0deg)) rotateY(var(--field-ry, 0deg)); transform-style: preserve-3d; }
.field-surface::before { content: ""; position: absolute; z-index: 2; inset: 0; pointer-events: none; background: linear-gradient(180deg, rgba(3,13,23,.35), transparent 26%, transparent 70%, rgba(2,12,22,.38)), radial-gradient(circle at 50% 48%, transparent 40%, rgba(3,15,26,.32)); }
.field-surface::after { content: ""; position: absolute; z-index: 3; top: -25%; bottom: -25%; left: -38%; width: 28%; pointer-events: none; background: linear-gradient(90deg, transparent, rgba(198,245,255,.09), transparent); transform: skewX(-14deg); animation: field-scan 7.5s ease-in-out infinite; }
@keyframes field-scan { 0%, 14% { left: -38%; } 72%, 100% { left: 118%; } }
.field-canvas { position: absolute; z-index: 0; inset: 0; width: 100%; height: 100%; transform: translate3d(var(--canvas-x, 0), var(--canvas-y, 0), 8px) scale(1.035); transition: transform .2s ease-out; }
.field-grid { position: absolute; z-index: 1; inset: -18px; opacity: .13; background-image: linear-gradient(rgba(255,255,255,.24) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.24) 1px, transparent 1px); background-size: 44px 44px; mix-blend-mode: screen; transform: translate3d(var(--grid-x, 0), var(--grid-y, 0), 12px); transition: transform .2s ease-out; }
.field-readout { position: absolute; z-index: 5; left: 20px; top: 20px; min-width: 188px; padding: 12px 14px; color: white; background: rgba(4,20,33,.62); border: 1px solid rgba(255,255,255,.24); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.field-readout span { display: block; color: rgba(255,255,255,.55); font-size: 9px; font-weight: 760; letter-spacing: .11em; }
.field-readout b { display: block; margin-top: 5px; font-size: 13px; font-weight: 700; }
.field-scale { position: absolute; z-index: 5; top: 20px; right: 18px; bottom: 20px; display: grid; grid-template-rows: auto 1fr auto; justify-items: end; gap: 9px; color: rgba(255,255,255,.7); font-size: 9px; font-weight: 660; text-shadow: 0 1px 8px rgba(0,0,0,.55); writing-mode: vertical-rl; }
.field-scale i { width: 6px; min-height: 100px; border-radius: 99px; background: linear-gradient(180deg, #f47a55 0%, #f5b35c 22%, #70ceb9 52%, #2388a7 73%, #12365f 100%); box-shadow: 0 0 0 1px rgba(255,255,255,.32); }
.observation { position: absolute; z-index: 6; display: flex; align-items: center; gap: 7px; color: white; font-size: 11px; font-style: normal; font-weight: 650; text-shadow: 0 1px 7px rgba(0,0,0,.75); transform: translate3d(var(--obs-x, 0), var(--obs-y, 0), 30px); transition: transform .2s ease-out, opacity .25s; }
.observation b { display: block; width: 13px; height: 13px; border: 3px solid white; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 4px rgba(255,255,255,.18); transition: opacity .25s, background .25s, transform .25s; animation: observation-pulse 2.8s ease-out infinite; }
.observation:nth-of-type(2) b { animation-delay: .65s; }
.observation:nth-of-type(3) b { animation-delay: 1.3s; }
.observation:nth-of-type(4) b { animation-delay: 1.95s; }
@keyframes observation-pulse { 0%, 35% { box-shadow: 0 0 0 4px rgba(255,255,255,.18); } 65% { box-shadow: 0 0 0 13px rgba(255,255,255,0); } 100% { box-shadow: 0 0 0 4px rgba(255,255,255,0); } }
.obs-a { left: 15%; top: 24%; }
.obs-b { right: 18%; top: 19%; }
.obs-c { left: 54%; bottom: 21%; }
.obs-d { left: 22%; bottom: 14%; }
.observation.is-test b { background: var(--red); }
.spatial-lab.is-holdout .observation.is-test b { background: transparent; border-color: var(--red); transform: scale(1.35); }
.spatial-lab.is-holdout .observation.is-test span { color: #ffd5ce; }
.spatial-lab.is-holdout .observation.is-test::after { content: ""; position: absolute; left: -12px; top: -12px; width: 34px; height: 34px; border: 1px dashed rgba(255,164,150,.8); border-radius: 50%; animation: holdout-ring 1.8s linear infinite; }
@keyframes holdout-ring { to { transform: rotate(360deg); } }
.field-legend { display: flex; gap: 24px; margin-top: 16px; color: var(--muted); font-size: 12px; }
.field-legend span { display: flex; align-items: center; gap: 8px; }
.field-legend i { width: 22px; height: 8px; }
.legend-rom { background: #154d7a; }
.legend-correction { background: #ef9f56; }
.field-note { max-width: 620px; margin: 10px 0 0; color: var(--muted); font-size: 11px; line-height: 1.6; }
.holdout-button { width: 100%; margin-top: 28px; padding: 16px 20px; border: 1px solid var(--ink); color: var(--ink); background: transparent; cursor: pointer; font-size: 14px; font-weight: 720; transition: color .2s, background .2s; }
.holdout-button:hover, .holdout-button:focus-visible, .holdout-button[aria-pressed="true"] { color: white; background: var(--ink); }
.formula-panel { display: flex; flex-direction: column; padding: clamp(34px, 4vw, 58px); }
.formula-label { margin: 0; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.formula { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin-top: 24px; padding: 22px 0 28px; border-bottom: 1px solid var(--line); font-family: Georgia, "Times New Roman", serif; font-size: clamp(28px, 3vw, 43px); line-height: 1.15; }
.formula > span, .formula > b { transition: opacity .25s, color .25s; }
.formula b { font-weight: 400; }
.formula sub { font-size: .45em; }
[data-spatial-state="rom"] .formula-level, [data-spatial-state="rom"] .formula-spatial { opacity: .16; }
[data-spatial-state="level"] .formula-spatial { opacity: .16; }
[data-spatial-state="level"] .formula-level, [data-spatial-state="spatial"] .formula-spatial { color: var(--blue); }
.formula-meaning { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.formula-meaning p { min-height: 118px; margin: 0; padding: 21px 18px 18px 0; transition: opacity .25s; }
.formula-meaning p + p { padding-left: 18px; border-left: 1px solid var(--line); }
.formula-meaning b { display: block; font-family: Georgia, serif; font-size: 17px; }
.formula-meaning span { display: block; margin-top: 9px; color: var(--muted); font-size: 12px; line-height: 1.55; }
[data-spatial-state="rom"] [data-explain="level"], [data-spatial-state="rom"] [data-explain="spatial"], [data-spatial-state="level"] [data-explain="spatial"] { opacity: .3; }
.lab-copy { padding: 28px 0; }
.lab-copy strong { font-size: 20px; }
.lab-copy p { margin: 12px 0 0; color: #4d5862; font-size: 15px; line-height: 1.75; }
.holdout-result { margin-top: auto; padding: 24px; border-left: 4px solid var(--red); background: #ebe7de; opacity: .34; transition: opacity .25s, background .25s; }
.spatial-lab.is-holdout .holdout-result { opacity: 1; background: #f1dfda; }
.holdout-result span { color: var(--red); font-size: 12px; font-weight: 800; }
.holdout-result strong { display: block; margin-top: 10px; font-size: 18px; }
.holdout-result p { margin: 8px 0 0; color: #535c64; font-size: 13px; }

.results { color: white; background: #121920; }
.results .chapter { color: var(--cyan); }
.result-list { max-width: var(--max); margin: 0 auto; border-top: 1px solid rgba(255,255,255,.45); }
.result-list article { display: grid; grid-template-columns: 120px minmax(280px, .8fr) minmax(320px, 1.2fr); align-items: center; gap: 34px; min-height: 150px; border-bottom: 1px solid var(--line-light); transition: padding-left .25s, background .25s; }
.result-list article:hover { padding-left: 18px; background: rgba(255,255,255,.035); }
.status { width: fit-content; padding: 4px 0; font-size: 12px; font-weight: 820; }
.status--done { color: var(--cyan); }
.status--failed { color: #ff8171; }
.status--pending { color: #e7c27f; }
.result-list h3 { margin: 0; font-size: clamp(21px, 2vw, 29px); font-weight: 610; letter-spacing: -.035em; }
.result-list p { margin: 0; color: rgba(255,255,255,.62); font-size: 15px; line-height: 1.7; }

.section--sand { background: var(--sand); }
.guard-demo { max-width: var(--max); margin: 0 auto; border-top: 1px solid var(--ink); }
.guard-controls { display: grid; grid-template-columns: repeat(3, 1fr); }
.guard-controls button { min-height: 76px; border: 0; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); color: #5b615f; background: transparent; cursor: pointer; font-size: 15px; font-weight: 690; }
.guard-controls button:last-child { border-right: 0; }
.guard-controls button.is-active { color: white; background: var(--ink); }
.guard-screen { min-height: 300px; display: grid; grid-template-columns: 70px 1fr auto; align-items: center; gap: 28px; padding: clamp(34px, 5vw, 72px); color: white; background: var(--ink-soft); transition: background .25s; }
.guard-light { width: 42px; height: 42px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 12px rgba(46,138,105,.15), 0 0 38px rgba(46,138,105,.45); transition: background .25s, box-shadow .25s; animation: guard-breathe 2.6s ease-in-out infinite; }
@keyframes guard-breathe { 50% { transform: scale(.88); } }
.guard-screen small { color: rgba(255,255,255,.45); font-size: 11px; font-weight: 780; letter-spacing: .1em; }
.guard-screen h3 { margin: 14px 0 6px; font-size: clamp(29px, 3vw, 44px); font-weight: 610; letter-spacing: -.045em; }
.guard-screen p { margin: 0; color: rgba(255,255,255,.62); font-size: 15px; }
.guard-screen > strong { color: #7de0b4; font-size: 13px; letter-spacing: .08em; }
[data-guard-state="missing"] .guard-screen, [data-guard-state="event"] .guard-screen { background: #32201d; }
[data-guard-state="missing"] .guard-light, [data-guard-state="event"] .guard-light { background: var(--red); box-shadow: 0 0 0 12px rgba(219,80,62,.14), 0 0 38px rgba(219,80,62,.4); }
[data-guard-state="missing"] .guard-screen > strong, [data-guard-state="event"] .guard-screen > strong { color: #ff9487; }
.guard-note { margin: 18px 0 0; color: #5c5d59; font-size: 12px; }

.closing { padding: clamp(100px, 12vw, 180px) clamp(24px, 6vw, 96px); text-align: center; background: var(--white); }
.closing > p { margin: 0; color: var(--blue); font-size: 12px; font-weight: 820; letter-spacing: .12em; }
.closing h2 { max-width: 1120px; margin: 28px auto 0; font-size: clamp(42px, 5vw, 74px); line-height: 1.12; font-weight: 640; letter-spacing: -.055em; }
.closing > span { display: block; max-width: 760px; margin: 30px auto 0; color: var(--muted); font-size: 16px; line-height: 1.75; }
.closing .text-link { margin-left: auto; margin-right: auto; }
footer { display: flex; justify-content: space-between; gap: 20px; padding: 24px clamp(24px, 6vw, 96px); color: rgba(255,255,255,.48); background: #090e13; font-size: 11px; }

html[data-language="en"] h1,
html[data-language="en"] h2,
html[data-language="en"] h3,
html[data-language="en"] p,
html[data-language="en"] dd { word-break: normal; overflow-wrap: break-word; }
html[data-language="en"] .hero h1 { font-size: clamp(50px, 4.65vw, 78px); line-height: 1.02; letter-spacing: -.052em; }
html[data-language="en"] .section-head h2 { letter-spacing: -.045em; }
html[data-language="en"] .method-card h3 { letter-spacing: -.045em; }

@media (max-width: 1080px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-nav { display: none; }
  .hero { grid-template-columns: 1fr; }
  .hero-visual { min-height: 560px; }
  .hero-facts { grid-template-columns: 1fr 1fr; }
  .hero-facts div:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .hero-facts div:nth-child(4) { border-top: 1px solid var(--line); }
  .brief-heading { grid-template-columns: 1fr; }
  .why-sequence { grid-template-columns: 1fr; }
  .why-sequence article { min-height: auto; padding: 38px 0; }
  .why-sequence article + article { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .why-sequence h3 { margin-top: 34px; }
  .method-story { grid-template-columns: 190px minmax(0, 1fr); gap: 28px; }
  .method-rail button { grid-template-columns: 36px 1fr; }
  .method-rail button b { padding-left: 24px; }
  .method-card { padding: clamp(32px, 5vw, 54px); }
  .lab-layout { grid-template-columns: 1fr; }
  .field-panel { border-right: 0; border-bottom: 1px solid var(--ink); }
  .result-list article { grid-template-columns: 100px 1fr; padding: 28px 0; }
  .result-list p { grid-column: 2; }
}

@media (max-height: 820px) and (min-height: 680px) and (min-width: 821px) {
  .method-rail { top: 88px; min-height: calc(100vh - 112px); padding-top: 20px; }
  .method-card { top: 84px; min-height: 0; height: calc(100vh - 124px); padding: 34px clamp(38px, 4.2vw, 58px); }
  .method-card:nth-child(2) { top: 94px; }
  .method-card:nth-child(3) { top: 104px; }
  .method-card:nth-child(4) { top: 114px; }
  .method-card h3 { margin-top: 30px; font-size: clamp(34px, 3.45vw, 48px); line-height: 1.14; }
  .method-card .panel-lead { margin-top: 22px; font-size: 16px; line-height: 1.62; }
  .method-card dl { padding-top: 26px; }
  .method-card dd { margin-top: 7px; font-size: 14px; line-height: 1.55; }
}

@media (max-height: 679px) and (min-width: 821px) {
  .method-cards { padding-bottom: 0; }
  .method-card,
  .method-card:nth-child(2),
  .method-card:nth-child(3),
  .method-card:nth-child(4) { position: relative; top: auto; min-height: 0; height: auto; margin-bottom: 24px; }
}

@media (max-width: 820px) {
  .method-story { display: block; }
  .method-rail { top: 66px; min-height: 0; display: grid; grid-template-columns: repeat(4, minmax(118px, 1fr)); padding: 0; overflow-x: auto; border: 1px solid var(--line-light); background: rgba(17,23,29,.96); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
  .method-rail > p, .method-rail-line { display: none; }
  .method-rail button { min-height: 70px; grid-template-columns: 26px 1fr; padding: 9px 14px; border-right: 1px solid var(--line-light); }
  .method-rail button::before { display: none; }
  .method-rail button b { padding: 0; }
  .method-rail button span { font-size: 13px; }
  .method-rail button.is-active { color: var(--ink); background: var(--cyan); }
  .method-cards { padding: 28px 0 0; }
  .method-card,
  .method-card:nth-child(2),
  .method-card:nth-child(3),
  .method-card:nth-child(4) { position: relative; top: auto; min-height: 0; margin-bottom: 18px; padding: 34px 26px; }
  .method-card:nth-child(4) { margin-bottom: 0; }
  .method-card h3 { margin-top: 46px; }
  .method-card dl { margin-top: 54px; }
}

@media (max-width: 680px) {
  .site-header { height: 66px; padding: 0 20px; }
  .brand { width: 118px; }
  .project-mark { display: none; }
  .header-actions { gap: 0; }
  .hero { padding-top: 66px; }
  .hero-copy { padding: 76px 20px 58px; }
  .hero h1 { font-size: clamp(42px, 11.7vw, 58px); line-height: 1.05; }
  html[data-language="en"] .hero h1 { font-size: clamp(39px, 10.5vw, 52px); line-height: 1.06; }
  .hero-summary { font-size: 17px; }
  .hero-visual { min-height: 480px; }
  .hero-index { left: 20px; right: 20px; }
  .hero-visual figcaption { left: 20px; right: 20px; }
  .hero-facts { grid-template-columns: 1fr; padding: 0 20px; }
  .hero-facts div, .hero-facts div + div { min-height: 100px; padding: 22px 0; border-left: 0; border-top: 1px solid var(--line); }
  .brief-grid { grid-template-columns: 1fr; }
  .brief-card { min-height: 0; padding: 30px 22px 34px; }
  .brief-card h3 { margin-top: 30px; font-size: 24px; }
  .brief-card p { margin-top: 18px; }
  .brief-thesis { grid-template-columns: 1fr; gap: 12px; padding: 28px 22px; }
  .section { padding-left: 20px; padding-right: 20px; }
  .section-head h2 { font-size: 36px; line-height: 1.22; }
  .research-question { padding-left: 20px; }
  .research-question p { font-size: 29px; line-height: 1.42; }
  .method-rail { margin-left: -20px; margin-right: -20px; padding-left: 20px; grid-template-columns: repeat(4, minmax(132px, 1fr)); border-left: 0; border-right: 0; }
  .method-card { padding: 30px 20px; }
  .method-card h3 { margin-top: 40px; font-size: 34px; }
  .panel-lead { font-size: 16px; }
  .method-card dl { grid-template-columns: 1fr; padding-top: 34px; }
  .method-card dl div { padding: 20px 0; }
  .method-card dl div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--line-light); }
  .lab-controls { grid-template-columns: 1fr; }
  .lab-controls button { min-height: 64px; border-right: 0; border-bottom: 1px solid var(--line); }
  .field-panel, .formula-panel { padding: 24px 18px; }
  .field-surface { min-height: 410px; }
  .field-heading { align-items: flex-start; flex-direction: column; }
  .field-readout { left: 14px; top: 14px; min-width: 168px; }
  .field-scale { top: 14px; right: 10px; bottom: 14px; }
  .field-scale span { display: none; }
  .formula { font-size: 29px; }
  .formula-meaning { grid-template-columns: 1fr; }
  .formula-meaning p { min-height: auto; padding: 17px 0; }
  .formula-meaning p + p { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .result-list article { grid-template-columns: 1fr; gap: 12px; }
  .result-list p { grid-column: 1; }
  .guard-controls { grid-template-columns: 1fr; }
  .guard-controls button { min-height: 60px; border-right: 0; }
  .guard-screen { grid-template-columns: 48px 1fr; padding: 30px 22px; }
  .guard-light { width: 30px; height: 30px; }
  .guard-screen > strong { grid-column: 2; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}