/* ============================================================
   Exact Posterior Score (EPS) — project page
   Centered academic layout with three switchable styles:
     [data-theme="branded"]  — our designed look (default)
   ============================================================ */
:root {
  --ink: #0d1424;
  --ink-soft: #475069;
  --ink-faint: #8a93a8;
  --paper: #fbfbfe;
  --panel: #ffffff;
  --line: #e7e9f1;
  --line-strong: #d4d8e6;

  --sans: 'Inter', system-ui, -apple-system, sans-serif;
  --serif: 'Source Serif 4', Georgia, serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;

  /* themeable tokens (branded defaults) */
  --accent: #be123c;
  --accent-2: #e11d48;
  --num-color: #be123c;
  --kicker-color: #be123c;
  --display-font: var(--serif);
  --display-weight: 600;

  --card-bg: #ffffff;
  --card-border: var(--line);
  --eps-bg: #fff1f4;
  --eps-soft: #fff6f8;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgba(13,20,36,.04), 0 12px 32px -16px rgba(13,20,36,.18);
  --shadow-lg: 0 30px 70px -36px rgba(13,20,36,.32);

  --hero-grid-opacity: .5;
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
em { font-style: italic; }

/* ---------------- nav ---------------- */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: center;
  gap: clamp(1rem, 5vw, 3rem);
  padding: .7rem clamp(1rem, 4vw, 2.4rem);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-brand {
  font-weight: 900; letter-spacing: .04em; font-size: 1.05rem; text-decoration: none;
  color: var(--accent);
}
[data-theme="branded"] .nav-brand {
  background: linear-gradient(120deg, #1d4ed8, var(--accent));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; flex-wrap: wrap; justify-content: center; gap: clamp(.6rem, 2.4vw, 1.6rem); }
.nav-links a {
  color: var(--ink-soft); text-decoration: none; font-size: .9rem; font-weight: 500;
  padding: .25rem 0; position: relative; white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--accent); }
.nav-links a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px;
  background: var(--accent); border-radius: 2px;
}

/* ---------------- hero ---------------- */
.hero {
  position: relative; overflow: hidden; text-align: center;
  padding: clamp(3rem, 8vw, 6rem) clamp(1.1rem, 5vw, 2.4rem) clamp(2.5rem, 6vw, 4rem);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(60% 50% at 18% 12%, rgba(37,99,235,.12), transparent 60%),
    radial-gradient(55% 50% at 84% 18%, rgba(225,29,72,.12), transparent 60%),
    radial-gradient(70% 60% at 50% 110%, rgba(15,157,107,.07), transparent 60%);
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
                    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 75%);
  opacity: var(--hero-grid-opacity);
}
.hero-inner { position: relative; z-index: 1; max-width: 940px; margin: 0 auto; }
.hero-venue {
  font-size: .8rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 1rem;
}
.hero h1 {
  font-family: var(--display-font);
  font-size: clamp(1.9rem, 5vw, 3.3rem);
  line-height: 1.08; font-weight: var(--display-weight); letter-spacing: -.015em;
  margin: 0 0 1.1rem;
}
.hero-tagline {
  font-size: clamp(1.02rem, 2.1vw, 1.28rem);
  color: var(--ink-soft); max-width: 680px; margin: 0 auto 1.8rem;
}
.authors { font-size: 1rem; font-weight: 500; margin: 0 auto .4rem; max-width: 860px; color: var(--ink); line-height: 1.9; }
.authors a { color: var(--ink); text-decoration: none; border-bottom: 1px solid color-mix(in srgb, var(--accent) 45%, transparent); transition: color .15s ease, border-color .15s ease; }
.authors a:hover { color: var(--accent); border-color: var(--accent); }
.authors sup { color: var(--ink-faint); font-weight: 600; }
.affiliation { font-size: .9rem; color: var(--ink-soft); margin: 0 0 .3rem; }
.eq-note { font-size: .85rem; font-style: italic; color: var(--ink-faint); margin: 0 0 1.8rem; }

.links { display: flex; flex-wrap: wrap; gap: .7rem; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .62rem 1.25rem; border-radius: 999px;
  font-size: .92rem; font-weight: 600; text-decoration: none;
  border: 1px solid var(--line-strong); color: var(--ink); background: var(--panel);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.btn-primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn-primary:hover { background: #1b2540; }
.btn-ghost { background: transparent; color: var(--ink-faint); cursor: not-allowed; border-style: dashed; }
.btn-ghost:hover { transform: none; box-shadow: none; }
.btn-code:hover { border-color: var(--accent); }

/* ---------------- sections (all centered) ---------------- */
.section {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(2.8rem, 7vw, 5rem) clamp(1.1rem, 5vw, 2.4rem);
  border-top: 1px solid var(--line);
  text-align: center;
}
.section-heading { max-width: 760px; margin: 0 auto 2.4rem; }
.kicker {
  display: inline-block; font-size: .76rem; font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--kicker-color); margin-bottom: .7rem;
}
.section-heading h2 {
  font-family: var(--display-font); font-weight: var(--display-weight); letter-spacing: -.01em;
  font-size: clamp(1.6rem, 3.6vw, 2.5rem); line-height: 1.14; margin: 0 0 .9rem;
}
.section-heading p { font-size: 1.05rem; color: var(--ink-soft); margin: 0; }

/* ---------------- abstract ---------------- */
.prose { max-width: 760px; margin: 0 auto; text-align: left; }
.prose p { font-size: 1.04rem; color: var(--ink-soft); margin: 0 0 1.1rem; }
.prose strong { color: var(--ink); }

.highlights {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
  max-width: 820px; margin: 2.4rem auto 0;
}
.highlights div {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius-sm); padding: 1.1rem .7rem;
  display: flex; flex-direction: column; gap: .25rem;
}
.highlights strong {
  font-family: var(--display-font); font-size: clamp(1.4rem, 3vw, 2rem); font-weight: var(--display-weight);
  color: var(--num-color); line-height: 1;
}
.highlights span { font-size: .78rem; color: var(--ink-soft); line-height: 1.3; }

/* ---------------- figures ---------------- */
.figure-hero, .figure-clean { margin: 0 auto; }
.figure-hero {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 1.4rem; box-shadow: var(--shadow-lg); max-width: 1000px;
}
.figure-hero img { border-radius: var(--radius-sm); margin: 0 auto; }
.figure-clean {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 1.1rem; box-shadow: var(--shadow); max-width: 1000px; margin: 1.6rem auto 0;
}
.figure-clean img { border-radius: var(--radius-sm); margin: 0 auto; }
.figure-hero figcaption, .figure-clean figcaption {
  font-size: .9rem; color: var(--ink-soft); margin: 1rem auto 0; line-height: 1.55; max-width: 760px;
}
/* zoomable images */
.figure-hero img, .figure-clean img {
  cursor: zoom-in; transition: transform .2s ease, box-shadow .2s ease;
}
.figure-hero img:hover, .figure-clean img:hover {
  transform: scale(1.012);
}

/* ---------------- method equations (stacked, full width) ---------------- */
.eq-row {
  display: flex; flex-direction: column; gap: 1rem;
  margin: 1.8rem auto 0; max-width: 760px;
}
.eq-card {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 1.3rem 1.6rem; box-shadow: var(--shadow); overflow-x: auto; text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: .3rem;
}
.eq-card-accent { border-color: color-mix(in srgb, var(--accent) 40%, transparent); background: var(--eps-soft); }
.eq-tag {
  display: block; font-size: .72rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-faint); margin-bottom: .4rem;
}
.eq-card-accent .eq-tag { color: var(--accent); }
.eq-card p { margin: .2rem 0; }
.method-note {
  max-width: 760px; margin: 2rem auto 0; text-align: left;
  font-size: .98rem; color: var(--ink-soft);
}
.method-note strong { color: var(--ink); }

/* ---------------- results ---------------- */
.result-band {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem;
  max-width: 1000px; margin: 0 auto 2rem;
}
.result-band article {
  background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 1.3rem 1.2rem; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: .35rem; text-align: center;
}
.result-band p { font-size: .76rem; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-faint); margin: 0; font-weight: 600; }
.result-band strong {
  font-family: var(--display-font); font-size: clamp(1.3rem, 2.6vw, 1.8rem); font-weight: var(--display-weight);
  color: var(--num-color); line-height: 1.05;
}
.result-band span { font-size: .82rem; color: var(--ink-soft); }

.table-toolbar { display: flex; justify-content: center; margin: 2.4rem 0 1rem; }
.seg { display: inline-flex; background: color-mix(in srgb, var(--line) 70%, var(--paper)); border-radius: 999px; padding: 4px; }
.seg-btn {
  border: none; background: transparent; color: var(--ink-soft);
  font: inherit; font-weight: 600; font-size: .88rem; padding: .45rem 1.1rem;
  border-radius: 999px; cursor: pointer; transition: all .15s ease;
}
.seg-btn.is-active { background: var(--panel); color: var(--ink); box-shadow: var(--shadow); }

.table-wrap {
  overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); background: var(--panel); max-width: 1000px; margin: 0 auto;
}
.table-wrap.is-hidden { display: none; }
.comparison-table { width: 100%; border-collapse: collapse; font-size: .78rem; }
.comparison-table th, .comparison-table td { padding: .42rem .55rem; text-align: center; white-space: nowrap; }
.comparison-table thead th { background: color-mix(in srgb, var(--line) 55%, var(--paper)); font-weight: 700; color: var(--ink); border-bottom: 1px solid var(--line-strong); }
.comparison-table .ta-l { text-align: left; }
.comparison-table tbody tr { border-bottom: 1px solid var(--line); }
.comparison-table .task-cell { font-weight: 700; vertical-align: middle; background: color-mix(in srgb, var(--line) 22%, var(--paper)); border-right: 1px solid var(--line); }
.comparison-table .eps-row { background: var(--eps-bg); }
.comparison-table .eps-row td { font-weight: 600; }
.table-note { font-size: .82rem; color: var(--ink-soft); margin: 1rem auto 0; max-width: 1000px; text-align: left; }

.runtime-card {
  margin: 2.6rem auto 0; background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 1.6rem; box-shadow: var(--shadow);
  max-width: 560px; text-align: center;
}
.runtime-card h3 { font-family: var(--display-font); font-weight: var(--display-weight); font-size: 1.1rem; margin: 0 0 1rem; }
.mini-table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.mini-table th, .mini-table td { padding: .5rem .8rem; text-align: center; }
.mini-table thead th { color: var(--ink-faint); font-weight: 700; border-bottom: 1px solid var(--line-strong); }
.mini-table .ta-l { text-align: left; }
.mini-table .muted { color: var(--ink-faint); font-style: italic; }
.mini-table tbody tr { border-bottom: 1px solid var(--line); }
.mini-table .eps-row { background: var(--eps-bg); }
.runtime-card p { font-size: .88rem; color: var(--ink-soft); margin: 1rem 0 0; }

/* ---------------- gallery ---------------- */
.gallery-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem;
  max-width: 1000px; margin: 1.6rem auto 0;
}
.more-results {
  max-width: 760px; margin: 2.6rem auto 0; font-size: 1rem; color: var(--ink-soft);
}
.more-results a { color: var(--accent); font-weight: 600; }

/* ---------------- citation ---------------- */
.cite-card { position: relative; max-width: 820px; margin: 0 auto; text-align: left; }
.cite-card pre {
  background: #0d1424; color: #d7dcec; border-radius: var(--radius);
  padding: 1.5rem 1.6rem; overflow-x: auto; font-family: var(--mono);
  font-size: .85rem; line-height: 1.7; box-shadow: var(--shadow-lg); margin: 0;
}
.copy-btn {
  position: absolute; top: .9rem; right: .9rem; z-index: 2;
  border: 1px solid rgba(255,255,255,.2); background: rgba(255,255,255,.08); color: #e9ecf6;
  font: inherit; font-size: .8rem; font-weight: 600; padding: .35rem .8rem;
  border-radius: 8px; cursor: pointer; transition: background .15s ease;
}
.copy-btn:hover { background: rgba(255,255,255,.18); }

/* ---------------- footer ---------------- */
.footer {
  max-width: var(--maxw); margin: 0 auto;
  padding: 2.4rem clamp(1.1rem, 5vw, 2.4rem) 4.5rem;
  border-top: 1px solid var(--line);
  display: flex; flex-direction: column; gap: .4rem; align-items: center; text-align: center;
  font-size: .88rem; color: var(--ink-soft);
}
.footer-tagline { font-family: var(--serif); font-style: italic; color: var(--ink-faint); }

/* ---------------- theme switcher ---------------- */

/* ---------------- lightbox ---------------- */
.lightbox {
  position: fixed; inset: 0; z-index: 100; display: none;
  align-items: center; justify-content: center; padding: 3vmin;
  background: rgba(8,12,22,.88); cursor: zoom-out; backdrop-filter: blur(3px);
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 96vw; max-height: 94vh; border-radius: 8px; box-shadow: 0 40px 90px -30px rgba(0,0,0,.7); }
.lightbox-hint { position: fixed; bottom: 1.2rem; left: 0; right: 0; text-align: center; color: rgba(255,255,255,.7); font-size: .8rem; }

/* ---------------- responsive ---------------- */
@media (max-width: 900px) {
  .eq-row { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .highlights { grid-template-columns: repeat(2, 1fr); }
  .result-band { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
  .figure-hero img:hover, .figure-clean img:hover { transform: none; }
}