/* ─────────────────────────────────────────────────────────────────
   CellQuant·AI — editorial scientific theme, scarlet-forward
   Type:   Newsreader (display) + Manrope (body) + JetBrains Mono (data)
   Color:  paper-warm bg, near-black ink, Rutgers scarlet as a real accent
   ───────────────────────────────────────────────────────────────── */

:root {
  --bg:        #fbfaf7;
  --surface:   #ffffff;
  --ink:       #0a0a0a;
  --ink-2:     #262626;
  --muted:     #6b6b6b;
  --muted-2:   #a3a3a3;
  --line:      #e5e3dd;
  --line-soft: #f0eee8;
  --accent:    #cc0033;       /* Rutgers scarlet, full saturation */
  --accent-d:  #8c0023;       /* darker scarlet for hover */
  --accent-soft: #fbe8eb;
  --highlight: #ffe4ea;       /* her-name marker highlight */

  --serif: "Newsreader", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans:  "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, sans-serif;
  --mono:  "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  --radius: 4px;
  --max-w:  1240px;
  --pad-x:  32px;
  --section-y: 120px;
}

@media (max-width: 768px) {
  :root { --pad-x: 20px; --section-y: 72px; }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

/* the HTML `hidden` attribute must beat any class-level display rule */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  font-weight: 400;
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* page-top scarlet ribbon */
body::before {
  content: "";
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  z-index: 100;
  pointer-events: none;
}

a    { color: inherit; text-decoration: none; transition: color 200ms ease; }
a:hover { color: var(--accent); }

button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }

img { max-width: 100%; height: auto; display: block; }

::selection { background: var(--accent); color: #fff; }

/* ── Tokens ──────────────────────────────────────────────────────── */

.num {
  font-family: var(--mono);
  font-feature-settings: "tnum", "ss01";
  font-weight: 400;
  letter-spacing: -0.005em;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.eyebrow-link {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: rgba(204, 0, 51, 0.35);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.eyebrow-link:hover {
  color: var(--accent-d);
  text-decoration-color: var(--accent);
}

.h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(28px, 4.4vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 14px 0 22px;
  font-variation-settings: "opsz" 32;
  color: var(--ink);
}
.h2 em {
  font-style: italic;
  font-variation-settings: "opsz" 72;
  color: var(--accent);
}

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--pad-x); }

/* ── Top bar ─────────────────────────────────────────────────────── */

.topbar {
  position: sticky;
  top: 3px; /* sit below the scarlet ribbon */
  z-index: 50;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 16px 0;
}
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 11px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.018em;
  color: var(--ink);
}
.brand .mark {
  width: 10px; height: 10px;
  background: var(--accent);
  border-radius: 1px;
  align-self: center;
  transform: translateY(-2px);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.brand em { font-style: normal; color: var(--accent); margin: 0 1px; font-weight: 400; }

.topnav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 13.5px;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: -0.005em;
}
.topnav a:hover { color: var(--accent); }
.topnav-strong { color: var(--ink); }
.topnav-strong:hover { color: var(--accent); }

@media (max-width: 640px) {
  .topnav a:not(.topnav-strong) { display: none; }
}

/* ── Hero ────────────────────────────────────────────────────────── */

.hero { padding: 88px 0 104px; position: relative; }
@media (max-width: 768px) { .hero { padding: 56px 0 72px; } }

.hero-grid {
  display: grid;
  grid-template-columns: 1.18fr 1fr;
  gap: 80px;
  align-items: start;
}
@media (max-width: 1024px) { .hero-grid { grid-template-columns: 1fr; gap: 48px; } }

.display {
  font-family: var(--serif);
  font-weight: 350;
  font-size: clamp(40px, 6.4vw, 80px);
  line-height: 0.96;
  letter-spacing: -0.028em;
  margin: 18px 0 28px;
  font-variation-settings: "opsz" 72;
  position: relative;
}
.display em {
  font-style: italic;
  color: var(--accent);
  font-weight: 350;
}
.display::after {
  content: "";
  display: block;
  width: 72px;
  height: 2px;
  background: var(--accent);
  margin-top: 24px;
}

.lede {
  font-size: 17.5px;
  color: var(--ink-2);
  max-width: 56ch;
  margin-bottom: 40px;
  line-height: 1.6;
}
.lede .num { font-size: 0.94em; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 28px 56px;
  list-style: none;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}
.hero-stats li { display: flex; flex-direction: column; gap: 2px; }
.hero-stats .num { font-size: 17px; color: var(--ink); font-weight: 500; }
.hero-stats .stat-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
@media (max-width: 480px) {
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 22px; }
}

/* ── Upload card ─────────────────────────────────────────────────── */

.upload-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
}
.upload-card::before {
  content: "";
  position: absolute; inset: -1px -1px auto -1px;
  height: 3px;
  background: var(--accent);
  border-radius: var(--radius) var(--radius) 0 0;
  pointer-events: none;
}

.upload-zone {
  position: relative;
  min-height: 320px;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  background: #fafaf6;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 32px 24px;
  transition: border-color 200ms ease, background 200ms ease, color 200ms ease;
  cursor: pointer;
  color: var(--muted);
  outline: none;
}
.upload-zone:hover, .upload-zone:focus-visible {
  border-color: var(--accent);
  color: var(--ink-2);
}
.upload-zone.is-dragging {
  border-color: var(--accent);
  border-style: solid;
  background: var(--accent-soft);
  color: var(--accent);
}
.upload-zone input[type="file"] { display: none; }

.upload-icon { color: var(--ink-2); margin-bottom: 12px; opacity: 0.7; }
.upload-zone:hover .upload-icon { color: var(--accent); opacity: 1; }
.upload-zone.is-dragging .upload-icon { color: var(--accent); opacity: 1; }

.upload-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.012em;
  font-variation-settings: "opsz" 32;
}
.upload-sub {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}
.upload-hint {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--muted-2);
  text-transform: uppercase;
}
.upload-preview {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.upload-preview img {
  width: 100%;
  max-height: 320px;
  object-fit: contain;
  background: var(--bg);
  border-radius: 2px;
}
.upload-preview img[hidden] { display: none; }

.preview-placeholder {
  width: 100%;
  min-height: 200px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 36px 24px;
  text-align: center;
}
.placeholder-mark { color: var(--accent); margin-bottom: 4px; }
.placeholder-title {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-variation-settings: "opsz" 32;
}
.placeholder-sub {
  font-size: 13px;
  color: var(--muted);
  max-width: 36ch;
  line-height: 1.5;
}

.upload-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
}
.upload-meta #previewName {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  text-align: left;
  letter-spacing: 0.02em;
}

.link-btn {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--muted-2);
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
  font: inherit;
  transition: text-decoration-color 200ms, color 200ms;
}
.link-btn:hover { color: var(--accent); text-decoration-color: var(--accent); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--accent);
  color: #fff;
  border-radius: 2px;
  padding: 17px 24px;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0;
  transition: background 200ms ease, transform 80ms ease;
  box-shadow: 0 1px 0 rgba(0,0,0,0.04);
}
.btn-primary:hover:not(:disabled) { background: var(--accent-d); }
.btn-primary:active:not(:disabled) { transform: translateY(1px); }
.btn-primary:disabled { background: var(--muted-2); cursor: not-allowed; opacity: 0.85; }

.btn-loader {
  width: 13px; height: 13px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 720ms linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Result panel ────────────────────────────────────────────────── */

.result {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  padding: 72px 0;
  animation: fadeUp 0.6s cubic-bezier(.2,.7,.2,1) backwards;
}
.result-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: center;
}
@media (max-width: 768px) { .result-grid { grid-template-columns: 1fr; gap: 32px; } }

.result-eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
.result-count {
  font-family: var(--mono);
  font-size: clamp(80px, 13vw, 168px);
  font-weight: 300;
  line-height: 0.94;
  letter-spacing: -0.045em;
  margin: 8px 0 8px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.result-note { color: var(--muted); font-size: 13px; }

.result-meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 32px;
  border-left: 2px solid var(--accent);
  padding-left: 32px;
}
@media (max-width: 768px) {
  .result-meta { border-left: none; padding-left: 0; border-top: 2px solid var(--accent); padding-top: 24px; }
}
.result-meta dt {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
  font-weight: 500;
}
.result-meta dd { font-family: var(--mono); font-size: 15px; color: var(--ink); letter-spacing: -0.005em; }

/* ── System (silent image triptych) ──────────────────────────────── */

.system { padding: 16px 0 var(--section-y); }
.system-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .system-grid { grid-template-columns: 1fr; gap: 24px; } }
.system-grid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 2px;
  background: var(--line-soft);
  filter: saturate(0.98) contrast(1.02);
  transition: filter 280ms ease, transform 280ms ease;
}
.system-grid img:hover {
  filter: saturate(1.08) contrast(1.05);
  transform: translateY(-2px);
}

/* ── Method ──────────────────────────────────────────────────────── */

.method { padding: var(--section-y) 0; }
.method-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 80px;
  align-items: start;
}
@media (max-width: 1024px) { .method-grid { grid-template-columns: 1fr; gap: 48px; } }

.method-text p { color: var(--ink-2); margin-bottom: 18px; max-width: 60ch; font-size: 17px; line-height: 1.7; }
.method-text code, .method-text .code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--line-soft);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.method-text strong { color: var(--ink); font-weight: 600; }
.method-train { padding-top: 12px; border-top: 1px solid var(--line); margin-top: 8px; }

.arch {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-2);
  white-space: pre;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  overflow-x: auto;
  letter-spacing: -0.01em;
  position: sticky;
  top: 96px;
  border-left: 2px solid var(--accent);
}
.arch .arch-h {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 10.5px;
}
@media (max-width: 1024px) { .arch { position: static; } }

/* ── Callout ─────────────────────────────────────────────────────── */

.callout { padding: 0 0 var(--section-y); }
.callout-card {
  border-left: 3px solid var(--accent);
  background: linear-gradient(90deg, var(--accent-soft) 0%, transparent 60%);
  padding: 16px 24px 16px 24px;
  max-width: 720px;
  border-radius: 0 2px 2px 0;
}
.callout-card p:not(.eyebrow) {
  color: var(--ink-2);
  margin-top: 4px;
  font-size: 17px;
  line-height: 1.6;
}

/* ── References ──────────────────────────────────────────────────── */

.refs {
  border-top: 1px solid var(--line);
  padding: var(--section-y) 0;
  background: var(--surface);
}
.refs-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 80px;
  align-items: start;
}
@media (max-width: 1024px) { .refs-grid { grid-template-columns: 1fr; gap: 48px; } }
.refs-text p { color: var(--ink-2); max-width: 44ch; font-size: 16.5px; }
.refs-text em { font-style: italic; color: var(--accent); font-family: var(--serif); }
.refs-link { margin-top: 16px; font-family: var(--mono); font-size: 13px; }
.refs-link a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--muted-2);
  text-underline-offset: 4px;
}
.refs-link a:hover { color: var(--accent); text-decoration-color: var(--accent); }

.refs-list { list-style: none; counter-reset: ref; }
.refs-list li {
  counter-increment: ref;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  position: relative;
  padding-left: 56px;
}
.refs-list li:last-child { border-bottom: 1px solid var(--line); }
.refs-list li::before {
  content: counter(ref, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 30px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 600;
}
.refs-list a {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.42;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.012em;
  display: block;
  font-variation-settings: "opsz" 24;
}
.refs-list a strong {
  font-weight: 500;
  background: linear-gradient(transparent 65%, var(--highlight) 65%, var(--highlight) 92%, transparent 92%);
  padding: 0 1px;
  color: var(--ink);
}
.refs-list a em { font-style: italic; color: inherit; }
.refs-list a:hover { color: var(--accent); }
.ref-meta {
  display: block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.ref-primary {
  background: linear-gradient(90deg, var(--accent-soft) 0%, transparent 70%);
  margin: 0 -16px;
  padding-left: 72px !important;
  padding-right: 16px !important;
  border-radius: 2px;
  border-top-color: transparent !important;
}
.ref-primary::before { left: 16px !important; color: var(--accent) !important; font-weight: 700 !important; }
.ref-primary a { font-size: 21px; }
.ref-tag {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: #fff;
  padding: 3px 8px;
  border: 1px solid var(--accent);
  border-radius: 2px;
  font-weight: 600;
}

/* ── Authors / Lead author ───────────────────────────────────────── */

.authors { padding: var(--section-y) 0; }

.lead-author {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 56px;
  margin-top: 40px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
  align-items: start;
}
@media (max-width: 900px)  { .lead-author { grid-template-columns: 1fr; gap: 28px; } }

.lead-portrait {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: center top;
  border-radius: 2px;
  background: var(--line-soft);
  filter: saturate(1) contrast(1.02);
}

.lead-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
  padding: 5px 10px;
  border-radius: 2px;
  margin-bottom: 16px;
}
.lead-name {
  font-family: var(--serif);
  font-size: clamp(32px, 4vw, 44px);
  font-weight: 500;
  letter-spacing: -0.022em;
  margin-bottom: 6px;
  font-variation-settings: "opsz" 48;
  color: var(--ink);
}
.lead-role {
  color: var(--muted);
  font-size: 14.5px;
  margin-bottom: 18px;
  font-family: var(--mono);
  letter-spacing: 0.01em;
}
.lead-bio {
  color: var(--ink-2);
  font-size: 17px;
  line-height: 1.6;
  margin-bottom: 24px;
  max-width: 60ch;
}
.lead-bio code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--line-soft);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--ink);
}
.lead-links {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
  line-height: 1.9;
}
.lead-links a {
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  padding-bottom: 1px;
}
.lead-links a:hover { color: var(--accent); border-color: var(--accent); }
.lead-links .dot { color: var(--muted-2); margin: 0 8px; }

.ack-block {
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--line);
}
.ack-grid {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 24px;
}
@media (max-width: 640px) { .ack-grid { grid-template-columns: 1fr; gap: 24px; } }

.ack-person {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 20px;
  align-items: center;
}
.ack-portrait {
  width: 88px; height: 88px;
  object-fit: cover;
  object-position: center top;
  border-radius: 2px;
  background: var(--line-soft);
}
.ack-name {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin-bottom: 4px;
}
.ack-role {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

/* ── Footer ──────────────────────────────────────────────────────── */

.footer {
  border-top: 1px solid var(--line);
  padding: 64px 0 48px;
  background: var(--surface);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px 56px;
  align-items: center;
}
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; align-items: start; } }
.footer-ack p:not(.eyebrow) {
  color: var(--ink-2);
  max-width: 50ch;
  margin-top: 8px;
  font-size: 14.5px;
  line-height: 1.55;
}
.footer-logos {
  display: flex;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
}
.footer-logos img {
  height: 56px;
  width: auto;
  object-fit: contain;
  filter: none;            /* full color, bold and clear */
  opacity: 1;
  transition: transform 200ms ease;
}
.footer-logos img:hover { transform: translateY(-1px); }

.footer-fine {
  grid-column: 1 / -1;
  border-top: 1px solid var(--line);
  padding-top: 24px;
  margin-top: 24px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted-2);
  position: relative;
}
.footer-fine::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 48px;
  height: 2px;
  background: var(--accent);
}

/* ── Reveal ──────────────────────────────────────────────────────── */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal      { animation: fadeUp 0.6s cubic-bezier(.2,.7,.2,1) backwards; }
.reveal-1    { animation-delay: 0.05s; }
.reveal-2    { animation-delay: 0.18s; }
.reveal-3    { animation-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}