:root {
  --paper: #f4f1e8;
  --paper-2: #efebdf;
  --card: #fbfaf5;
  --ink: #22201b;
  --ink-soft: #45423a;
  --muted: #7d796d;
  --line: #d8d3c4;
  --line-2: #c4bdab;
  --teal: #1b7d75;
  --teal-deep: #155f59;
  --amber: #b9772a;
  --grid: rgba(34, 32, 27, 0.045);
  --f: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --m: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html, body { overflow-x: clip; }
body {
  font-family: var(--f); color: var(--ink); background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
}
.ark ::selection { background: var(--teal); color: #fff; }
.ark .container { width: min(1160px, calc(100% - 52px)); margin: 0 auto; }
.ark h1, .ark h2, .ark h3 { font-family: var(--f); font-weight: 500; letter-spacing: -0.01em; color: var(--ink); line-height: 1.08; }
.ark em { font-style: italic; font-weight: 500; color: var(--teal-deep); }
.ark p { margin: 0; }
.ark img { max-width: 100%; }
.ark .mono { font-family: var(--m); }

.ark .reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.ark .reveal.in { opacity: 1; transform: none; }

.ark .klabel {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--m); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--teal-deep);
}
.ark .klabel::before { content: ""; width: 26px; height: 1px; background: var(--line-2); }
.ark .klabel::after { content: ""; width: 6px; height: 6px; border: 1px solid var(--teal-deep); transform: rotate(45deg); }

.ark .shead { max-width: 720px; margin: 0 0 46px; }
.ark .shead .klabel { margin-bottom: 18px; }
.ark .shead h2 { font-size: clamp(1.9rem, 3.8vw, 3rem); margin: 0 0 14px; }
.ark .shead p { color: var(--muted); font-size: 1.06rem; line-height: 1.65; font-style: italic; }

.ark .btn {
  display: inline-flex; align-items: center; gap: 10px; cursor: pointer;
  font-family: var(--m); font-weight: 500; font-size: 0.82rem; letter-spacing: 0.02em;
  padding: 13px 22px; border: 1px solid var(--ink); transition: 0.25s var(--ease);
  background: var(--ink); color: var(--paper); border-radius: 0;
}
.ark .btn svg { width: 17px; height: 17px; }
.ark .btn:hover { background: var(--teal-deep); border-color: var(--teal-deep); color: #fff; transform: translateY(-2px); }
.ark .btn.ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.ark .btn.ghost:hover { background: transparent; border-color: var(--teal-deep); color: var(--teal-deep); }

.ark .reg { position: absolute; width: 16px; height: 16px; pointer-events: none; z-index: 2; }
.ark .reg::before, .ark .reg::after { content: ""; position: absolute; background: var(--line-2); }
.ark .reg::before { width: 16px; height: 1px; top: 50%; left: 0; }
.ark .reg::after { width: 1px; height: 16px; left: 50%; top: 0; }
.ark .reg-tl { top: 18px; left: 18px; }
.ark .reg-tr { top: 18px; right: 18px; }
.ark .reg-br { bottom: 18px; right: 18px; }

.ark .nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(244, 241, 232, 0.9); backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.ark .nav-in { display: flex; align-items: center; gap: 20px; height: 70px; }
.ark .brand { display: inline-flex; align-items: center; flex: none; }
.ark .brand-logo { height: 28px; width: auto; }
.ark .nav-links { display: flex; align-items: center; gap: 30px; margin-left: auto; }
.ark .nav-links > a:not(.btn) { font-family: var(--m); font-size: 0.78rem; letter-spacing: 0.02em; color: var(--ink-soft); transition: color 0.2s; }
.ark .nav-links > a:not(.btn):hover { color: var(--teal-deep); }
.ark .nav-links .btn { padding: 10px 18px; }
.ark .burger { display: none; background: none; border: 0; color: var(--ink); cursor: pointer; padding: 6px; margin-left: auto; }
.ark .burger svg { width: 26px; height: 26px; }
.ark .nav-home {
  display: inline-flex; align-items: center; gap: 7px; padding: 8px 12px;
  border: 1px solid var(--line-2); background: var(--card); color: var(--ink); flex: none;
  font-family: var(--m); font-size: 0.74rem; font-weight: 500; transition: 0.2s;
}
.ark .nav-home:hover { border-color: var(--teal-deep); color: var(--teal-deep); }

.ark .hero { position: relative; padding: clamp(40px, 6vw, 72px) 0 0; border-bottom: 1px solid var(--line); }
.ark .hero-in { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(36px, 5vw, 64px); align-items: start; padding-bottom: clamp(40px, 5vw, 64px); }
.ark .filerow { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.ark .filetag {
  font-family: var(--m); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--teal-deep); border: 1px solid var(--line-2); padding: 5px 11px; background: var(--card);
}
.ark .filetag.muted { color: var(--muted); }
.ark .hero-kor { font-family: var(--m); font-size: 0.84rem; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 14px; }
.ark .hero h1 { font-size: clamp(2.4rem, 5.4vw, 4.1rem); margin: 0 0 20px; }
.ark .hero-lead { font-size: clamp(1.04rem, 1.5vw, 1.18rem); color: var(--ink-soft); max-width: 520px; line-height: 1.66; }
.ark .hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 34px; }

.ark .abstract { display: grid; gap: 0; border-top: 1px solid var(--line-2); }
.ark .abrow { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.ark .abrow dt { font-family: var(--m); font-size: 0.72rem; letter-spacing: 0.04em; color: var(--muted); margin: 0; }
.ark .abrow dd { margin: 0; font-family: var(--m); font-size: 0.96rem; font-weight: 700; color: var(--teal-deep); white-space: nowrap; }

.ark .specimen { margin: 0; position: relative; }
.ark .spec-cap { display: flex; justify-content: space-between; align-items: baseline; font-family: var(--m); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 8px; }
.ark .spec-cap span:first-child { color: var(--teal-deep); font-weight: 700; }
.ark .needle-plate { background: var(--card); border: 1px solid var(--line-2); padding: 22px; box-shadow: 0 30px 60px -40px rgba(34, 32, 27, 0.5); }
.ark .needle-svg { width: 100%; height: auto; display: block; border: 1px solid var(--line); }
.ark .skin-1 { fill: #efe9d8; }
.ark .skin-2 { fill: #e7dfc9; }
.ark .skin-3 { fill: #ded4ba; }
.ark .layer-rule { stroke: var(--line-2); stroke-width: 1; stroke-dasharray: 4 4; }
.ark .needle-mid { stroke: rgba(255, 255, 255, 0.55); stroke-width: 1; }
.ark .needle polygon { stroke: var(--teal-deep); stroke-width: 1; }
.ark .diffuse circle { fill: var(--amber); opacity: 0.78; }
.ark .callout line { stroke: var(--ink-soft); stroke-width: 0.8; stroke-dasharray: 2 3; }
.ark .needle-key { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 0; counter-reset: nk; }
.ark .needle-key li { display: grid; grid-template-columns: 22px 1fr; gap: 12px; padding: 10px 0; border-top: 1px solid var(--line); align-items: baseline; }
.ark .needle-key li::before { grid-column: 1; grid-row: 1; counter-increment: nk; content: counter(nk); font-family: var(--m); font-size: 0.72rem; font-weight: 700; color: var(--amber); }
.ark .needle-key b { grid-column: 2; grid-row: 1; font-size: 0.94rem; font-weight: 600; color: var(--ink); }
.ark .needle-key span { grid-column: 2; grid-row: 2; display: block; font-size: 0.82rem; color: var(--muted); line-height: 1.5; margin-top: 2px; }

.ark .hero-strip { overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper-2); }
.ark .strip-track { display: inline-flex; white-space: nowrap; padding: 11px 0; animation: arkmarq 34s linear infinite; }
.ark .strip-i { font-family: var(--m); font-size: 0.74rem; letter-spacing: 0.08em; color: var(--ink-soft); padding: 0 18px; }
.ark .strip-x { color: var(--amber); }
@keyframes arkmarq { from { transform: translateX(0); } to { transform: translateX(-50%); } }

.ark .dossier { padding: clamp(60px, 8vw, 104px) 0; }
.ark .dossier-grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: clamp(40px, 5vw, 70px); align-items: start; }
.ark .dossier-body h2 { font-size: clamp(1.8rem, 3.4vw, 2.7rem); margin: 16px 0 20px; }
.ark .dossier-body p { color: var(--ink-soft); line-height: 1.8; margin: 0 0 16px; max-width: 600px; }
.ark .dossier-body .lead-p { font-size: 1.1rem; color: var(--ink); }
.ark .ledger { position: sticky; top: 92px; background: var(--card); border: 1px solid var(--line-2); padding: 24px 24px 12px; }
.ark .ledger-head { display: block; font-family: var(--m); font-size: 0.66rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--amber); margin-bottom: 8px; }
.ark .ledger dl { margin: 0; }
.ark .ledrow { padding: 13px 0; border-top: 1px solid var(--line); }
.ark .ledrow dt { font-family: var(--m); font-size: 0.66rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 0 0 4px; }
.ark .ledrow dd { margin: 0; font-size: 0.96rem; font-weight: 500; color: var(--ink); line-height: 1.4; }

.ark .figure { padding: clamp(56px, 8vw, 100px) 0; background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.ark .fig-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 5vw, 60px); align-items: start; }
.ark .fig-feats { list-style: none; margin: 0; padding: 0; }
.ark .fig-feat { display: grid; grid-template-columns: 40px 1fr; gap: 16px; padding: 20px 0; border-top: 1px solid var(--line-2); align-items: start; }
.ark .fig-feat:last-child { border-bottom: 1px solid var(--line-2); }
.ark .fig-no { font-family: var(--m); font-size: 0.82rem; font-weight: 700; color: var(--card); background: var(--teal-deep); width: 30px; height: 30px; display: grid; place-items: center; }
.ark .fig-feat b { display: block; font-size: 1.08rem; font-weight: 600; color: var(--ink); margin-bottom: 5px; }
.ark .fig-feat span { font-size: 0.92rem; color: var(--muted); line-height: 1.6; }

.ark .assay { margin: 0; background: var(--card); border: 1px solid var(--line-2); padding: 26px; box-shadow: 0 30px 60px -42px rgba(34, 32, 27, 0.5); }
.ark .assay figcaption { display: flex; flex-direction: column; gap: 4px; margin-bottom: 22px; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.ark .assay-fig { font-family: var(--m); font-size: 0.68rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--amber); }
.ark .assay-name { font-size: 1.1rem; font-weight: 600; color: var(--ink); }
.ark .assay-bars { display: grid; gap: 16px; }
.ark .assay-row { display: grid; grid-template-columns: 1fr; gap: 6px; }
.ark .assay-lbl { font-size: 0.88rem; color: var(--ink-soft); }
.ark .assay-bar { position: relative; height: 9px; background: var(--paper-2); border: 1px solid var(--line); overflow: hidden; }
.ark .assay-bar i { position: absolute; inset: 0 auto 0 0; width: 0; background: linear-gradient(90deg, var(--teal), var(--amber)); transition: width 1.1s var(--ease) 0.2s; }
.ark .assay.in .assay-bar i { width: var(--v); }
.ark .assay-val { font-family: var(--m); font-size: 0.8rem; font-weight: 700; color: var(--teal-deep); }
.ark .assay-note { font-family: var(--m); font-size: 0.72rem; color: var(--muted); margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); line-height: 1.6; }

.ark .log { padding: clamp(56px, 8vw, 100px) 0; }
.ark .logtable { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.ark .logrow { display: grid; grid-template-columns: 48px 92px 1fr; gap: 18px; padding: 16px 4px; border-bottom: 1px solid var(--line); align-items: baseline; transition: background 0.2s; }
.ark .logrow:hover { background: var(--card); }
.ark .log-i { font-family: var(--m); font-size: 0.74rem; color: var(--muted); }
.ark .log-y { font-family: var(--m); font-size: 0.86rem; font-weight: 700; color: var(--teal-deep); }
.ark .log-t { font-size: 1rem; color: var(--ink); line-height: 1.5; }

.ark .catalog { padding: clamp(56px, 8vw, 100px) 0; background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.ark .plates { display: grid; grid-template-columns: repeat(auto-fill, minmax(252px, 1fr)); gap: 22px; }
.ark .plate { background: var(--card); border: 1px solid var(--line-2); display: flex; flex-direction: column; transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease); }
.ark .plate:hover { transform: translateY(-5px); box-shadow: 0 32px 56px -36px rgba(34, 32, 27, 0.42); }
.ark .plate-pic { position: relative; aspect-ratio: 1/1; background: var(--paper); display: grid; place-items: center; padding: 26px; border-bottom: 1px solid var(--line); overflow: hidden; }
.ark .plate-pic img { width: 100%; height: 100%; object-fit: contain; mix-blend-mode: multiply; }
.ark .plate-spc { position: absolute; top: 10px; left: 12px; z-index: 2; font-family: var(--m); font-size: 0.66rem; font-weight: 700; letter-spacing: 0.08em; color: var(--teal-deep); }
.ark .plate-corner { position: absolute; width: 12px; height: 12px; border: 1px solid var(--line-2); }
.ark .plate-corner.tl { top: 8px; left: 8px; border-right: 0; border-bottom: 0; }
.ark .plate-corner.tr { top: 8px; right: 8px; border-left: 0; border-bottom: 0; }
.ark .plate-corner.bl { bottom: 8px; left: 8px; border-right: 0; border-top: 0; }
.ark .plate-corner.br { bottom: 8px; right: 8px; border-left: 0; border-top: 0; }
.ark .plate-body { padding: 16px 18px 20px; flex: 1; display: flex; flex-direction: column; }
.ark .plate-en { font-family: var(--m); font-size: 0.68rem; font-weight: 500; letter-spacing: 0.04em; text-transform: uppercase; color: var(--amber); }
.ark .plate-body h3 { font-size: 1.08rem; margin: 6px 0 9px; line-height: 1.25; }
.ark .plate-body p { font-size: 0.86rem; color: var(--muted); line-height: 1.58; margin: 0; }

.ark .registry { padding: clamp(56px, 8vw, 96px) 0; }
.ark .reg-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); max-width: 860px; }
.ark .reg-row { display: grid; grid-template-columns: 56px 22px 1fr; gap: 16px; padding: 17px 4px; border-bottom: 1px solid var(--line); align-items: center; }
.ark .reg-no { font-family: var(--m); font-size: 0.74rem; font-weight: 700; color: var(--muted); }
.ark .reg-tick { width: 22px; height: 22px; display: grid; place-items: center; border: 1px solid var(--teal-deep); color: var(--teal-deep); font-size: 0.8rem; font-weight: 700; }
.ark .reg-txt { font-size: 1rem; color: var(--ink); }

.ark .network { padding: clamp(56px, 8vw, 100px) 0; background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.ark .net-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.ark .net-card { background: var(--card); border: 1px solid var(--line-2); padding: 28px 26px; position: relative; }
.ark .net-card::before { content: ""; position: absolute; top: 0; left: 0; width: 40px; height: 3px; background: var(--teal-deep); }
.ark .net-no { font-family: var(--m); font-size: 1.5rem; font-weight: 700; color: var(--line-2); display: block; }
.ark .net-role { display: inline-block; font-family: var(--m); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.05em; text-transform: uppercase; color: var(--amber); margin: 10px 0 6px; }
.ark .net-card h3 { font-size: 1.22rem; margin: 0 0 10px; line-height: 1.22; }
.ark .net-card p { color: var(--muted); font-size: 0.92rem; line-height: 1.62; }

.ark .field { padding: clamp(56px, 8vw, 100px) 0; }
.ark .field-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(36px, 5vw, 64px); align-items: start; }
.ark .field-head { position: sticky; top: 92px; }
.ark .field-head .klabel { margin-bottom: 16px; }
.ark .field-head h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); margin: 0 0 12px; }
.ark .field-head p { color: var(--muted); line-height: 1.65; font-style: italic; }
.ark .field-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.ark .field-list li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 18px 4px; border-bottom: 1px solid var(--line); align-items: baseline; }
.ark .field-no { font-family: var(--m); font-size: 0.74rem; font-weight: 700; color: var(--amber); }
.ark .field-list li > span:last-child { font-size: 1.04rem; color: var(--ink); line-height: 1.5; }

.ark .appendix { padding: clamp(54px, 8vw, 92px) 0; background: var(--paper-2); border-top: 1px solid var(--line); }
.ark .appx-list { display: grid; gap: 0; border-top: 1px solid var(--ink); }
.ark .appx { display: grid; grid-template-columns: 56px 1fr auto 24px; gap: 16px; align-items: center; padding: 20px 6px; border-bottom: 1px solid var(--line); color: var(--ink); transition: 0.2s var(--ease); }
.ark .appx:hover { background: var(--card); padding-left: 14px; }
.ark .appx-no { font-family: var(--m); font-size: 0.78rem; font-weight: 700; color: var(--teal-deep); }
.ark .appx-label { font-size: 1.06rem; font-weight: 500; }
.ark .appx-meta { font-family: var(--m); font-size: 0.72rem; color: var(--muted); }
.ark .appx-arr { width: 20px; height: 20px; color: var(--teal-deep); }

.ark .close { padding: clamp(60px, 8vw, 104px) 0; }
.ark .close-card { position: relative; background: var(--ink); color: var(--paper); border: 1px solid var(--ink); padding: clamp(40px, 6vw, 72px); text-align: center; }
.ark .close-card .klabel { justify-content: center; color: var(--amber); margin-bottom: 16px; }
.ark .close-card .klabel::before { background: rgba(255, 255, 255, 0.3); }
.ark .close-card .klabel::after { border-color: var(--amber); }
.ark .close-card .reg::before, .ark .close-card .reg::after { background: rgba(255, 255, 255, 0.35); }
.ark .close-card h2 { color: #fff; font-size: clamp(1.7rem, 3.2vw, 2.6rem); margin: 0 0 14px; }
.ark .close-card p { color: rgba(255, 255, 255, 0.82); max-width: 580px; margin: 0 auto 28px; line-height: 1.7; font-style: italic; font-size: 1.06rem; }
.ark .close-card .btn { background: var(--paper); border-color: var(--paper); color: var(--ink); }
.ark .close-card .btn:hover { background: var(--teal); border-color: var(--teal); color: #fff; }
.ark .foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; margin-top: 34px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--m); font-size: 0.74rem; }

@media (max-width: 980px) {
  .ark .nav-links {
    position: fixed; inset: 70px 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--line-2); padding: 10px 26px 22px; margin-left: 0;
    transform: translateY(-135%); transition: transform 0.35s var(--ease); box-shadow: 0 24px 40px -28px rgba(34, 32, 27, 0.5);
  }
  body.menu-open .ark .nav-links { transform: translateY(0); }
  .ark .nav-links > a { padding: 15px 4px; border-bottom: 1px solid var(--line); }
  .ark .nav-links .btn { margin-top: 12px; justify-content: center; }
  .ark .burger { display: inline-flex; }
  .ark .nav-home .lbl { display: none; }
  .ark .hero-in, .ark .dossier-grid, .ark .fig-grid, .ark .field-grid { grid-template-columns: 1fr; }
  .ark .specimen { max-width: 520px; }
  .ark .ledger, .ark .field-head { position: static; }
  .ark .net-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .ark .container { width: calc(100% - 34px); }
  .ark .plates { grid-template-columns: 1fr 1fr; gap: 14px; }
  .ark .logrow { grid-template-columns: 36px 76px 1fr; gap: 12px; }
  .ark .reg-row { grid-template-columns: 48px 22px 1fr; gap: 12px; }
  .ark .appx { grid-template-columns: 44px 1fr 24px; }
  .ark .appx-meta { display: none; }
  .ark .field-list li { grid-template-columns: 36px 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  .ark .reveal { opacity: 1; transform: none; transition: none; }
  .ark .strip-track { animation: none; }
  .ark .assay .assay-bar i { transition: none; }
  .ark .btn:hover, .ark .plate:hover { transform: none; }
}