/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 * All rights reserved.
 *
 * This source code is licensed under the license found in the
 * LICENSE file in the root directory of this source tree.
 */

:root {
  /* Meta brand palette — see https://about.meta.com/brand/. */
  --meta-blue: #0064e0;
  --meta-blue-light: #0081fb;
  --meta-blue-deep: #0050b5;
  --meta-purple: #9747ff;
  --meta-pink: #fe385c;
  --meta-soft-blue: #e7f3ff;
  --meta-ink: #1c2b33;

  --bg: #f5f8fc;
  --surface: #ffffff;
  --fg: var(--meta-ink);
  --muted: #5e6b75;
  --border: #dbe3ed;
  --border-strong: #b8c4d4;
  --accent: var(--meta-blue);
  --accent-2: var(--meta-blue-light);
  --accent-soft: var(--meta-soft-blue);
  --topline-bg: #fef3c7;
  --topline-border: #fcd34d;
  --topline-text: #92400e;
  --baseline-bg: #ecfdf5;
  --baseline-border: #6ee7b7;
  --baseline-text: #065f46;
  --offshelf-bg: var(--meta-soft-blue);
  --offshelf-border: #93c5fd;
  --offshelf-text: #0050b5;
  --reference-bg: #f5f3ff;
  --reference-border: #c4b5fd;
  --reference-text: #5b21b6;
  --chance-bg: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(28, 43, 51, 0.08);
  --shadow-md: 0 8px 24px rgba(28, 43, 51, 0.10);
  --shadow-lg: 0 24px 48px -12px rgba(0, 100, 224, 0.22);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Top branded accent stripe — Meta infinity gradient on every page. */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg,
    var(--meta-blue) 0%,
    var(--meta-blue-light) 30%,
    var(--meta-purple) 65%,
    var(--meta-pink) 100%);
  z-index: 100;
  pointer-events: none;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  color: #fff;
  padding: 2rem 0 5rem;
  margin-bottom: 3rem;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(1100px 600px at 80% -10%, rgba(151, 71, 255, 0.55), transparent 60%),
    radial-gradient(900px 500px at 0% 20%, rgba(0, 129, 251, 0.6), transparent 60%),
    radial-gradient(700px 400px at 100% 100%, rgba(254, 56, 92, 0.28), transparent 65%),
    linear-gradient(135deg, #03143a 0%, #0050b5 55%, #0064e0 100%);
  z-index: -1;
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: 0.4;
  mask-image: linear-gradient(to bottom, black 30%, transparent 100%);
}

.topnav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0 2.5rem;
}

/* ---------- Affiliations / org logo strip ---------- */
/* Placed on the light section between the hero and main content so the
   logos display in their original colors without needing a white pill. */
.org-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.75rem 2.5rem;
  padding: 1.25rem 0 1.5rem;
  margin: 0 0 2rem;
  border-bottom: 1px solid var(--border);
}

.org-strip img {
  display: block;
  width: auto;
  object-fit: contain;
  flex: 0 0 auto;
  opacity: 0.95;
  transition: opacity 0.15s ease;
}

.org-strip img:hover { opacity: 1; }

/* Wide horizontal text logos (Meta, Stanford, UTokyo). */
.org-strip img.logo-wide { height: 40px; }

/* The Meta wordmark is visually heavier than the other wide logos at the
   same height; shrink it slightly so the strip reads more evenly. */
.org-strip img.logo-wide.logo-meta { height: 28px; }

/* Tall / square logos (ENS). Nudged up a few px so its visual center
   aligns better with the wide wordmarks. */
.org-strip img.logo-tall { height: 68px; transform: translateY(-6px); }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
  text-decoration: none;
}

.brand-meta {
  height: 22px;
  width: auto;
  display: block;
  /* Force the Meta wordmark to white so it reads on the dark hero. */
  filter: brightness(0) invert(1);
}

.brand-divider {
  display: inline-block;
  width: 1px;
  height: 22px;
  background: rgba(255, 255, 255, 0.35);
}

.brand-name { font-size: 1rem; font-weight: 700; }

.topnav-links a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  margin-left: 1.5rem;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.15s ease;
}
.topnav-links a:hover { color: #fff; }

.hero-content { max-width: 760px; }

/* Wider variant for landing-page hero (less vertical space). */
.hero-content-wide { max-width: 1040px; }
.hero-content-wide .tagline,
.hero-content-wide .paper-subtitle,
.hero-content-wide .authors,
.hero-content-wide .affiliations,
.hero-content-wide .contrib-notes { max-width: 100%; }

.hero h1 {
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  margin: 0 0 1rem;
  letter-spacing: -0.03em;
  font-weight: 800;
  background: linear-gradient(110deg,
    #ffffff 0%,
    #cfe1ff 30%,
    var(--meta-blue-light) 55%,
    var(--meta-purple) 80%,
    var(--meta-pink) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  font-size: 1.15rem;
  color: #d6e7ff;
  margin: 0 0 2rem;
  max-width: 60ch;
}

.paper-subtitle {
  font-size: 1.05rem;
  color: #b8d4ff;
  font-style: italic;
  margin: -0.5rem 0 1.25rem;
  max-width: 70ch;
  font-weight: 500;
}

/* ---------- Authors / affiliations ---------- */
.authors {
  margin: 0 0 0.85rem;
  font-size: 0.98rem;
  color: #e0edff;
  line-height: 1.7;
  max-width: 78ch;
}

.authors .author {
  display: inline;
  margin-right: 0.55rem;
  white-space: nowrap;
}

.authors .author a {
  color: #8fb8ff;
  text-decoration: none;
  border-bottom: 1px dotted rgba(143, 184, 255, 0.5);
}
.authors .author a:hover { color: #fff; border-bottom-color: #fff; }

.authors sup,
.affiliations sup,
.contrib-notes sup {
  font-size: 0.7em;
  color: #b8d4ff;
  margin-left: 0.05em;
}

.affiliations {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  font-size: 0.86rem;
  color: #b8d4ff;
  margin: 0 0 0.5rem;
  max-width: 78ch;
}

.contrib-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  font-size: 0.82rem;
  color: rgba(184, 212, 255, 0.85);
  margin: 0 0 1.75rem;
  max-width: 78ch;
}

.contrib-notes a {
  color: #b8d4ff;
}
.contrib-notes a:hover { color: #fff; }

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
}

/* Stack of CTA rows (e.g. row 1: Paper/Code/Leaderboard, row 2: datasets). */
.cta-stack {
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.97rem;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.15s ease;
}

.btn svg { width: 18px; height: 18px; }

.btn-primary {
  background: linear-gradient(135deg, var(--meta-blue) 0%, var(--meta-blue-light) 100%);
  color: #fff;
  box-shadow: 0 8px 20px rgba(0, 100, 224, 0.4);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(0, 100, 224, 0.55);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.16);
}

.btn-github {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: #fff;
  box-shadow: 0 8px 20px rgba(239, 68, 68, 0.32);
}

.btn-github:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(239, 68, 68, 0.42);
}

.btn-leaderboard {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0) 55%),
    linear-gradient(135deg, var(--meta-blue-light) 0%, var(--meta-purple) 55%, var(--meta-pink) 100%);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.28);
  box-shadow:
    0 10px 24px rgba(0, 129, 251, 0.35),
    0 2px 6px rgba(254, 56, 92, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
  text-shadow: 0 1px 1px rgba(15, 23, 42, 0.18);
}

.btn-leaderboard svg {
  filter: drop-shadow(0 1px 1px rgba(15, 23, 42, 0.25));
}

.btn-leaderboard::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
  background-size: 200% 100%;
  background-position: 200% 0;
  opacity: 0;
  transition: opacity 0.2s ease, background-position 0.6s ease;
  pointer-events: none;
}

.btn-leaderboard:hover {
  transform: translateY(-2px);
  box-shadow:
    0 16px 34px rgba(151, 71, 255, 0.45),
    0 4px 10px rgba(254, 56, 92, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.btn-leaderboard:hover::after {
  opacity: 1;
  background-position: -50% 0;
}

.hero-stats {
  display: flex;
  gap: 2.25rem;
  margin-top: 2.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.stat { display: flex; flex-direction: column; }
.stat-value {
  font-size: 1.65rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.82rem;
  color: rgba(184, 212, 255, 0.85);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ---------- Sections ---------- */
main { padding-bottom: 4rem; }

section { margin-bottom: 3.5rem; }

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
}

h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: #1e293b;
}

p { margin: 0 0 1rem; }

.muted { color: var(--muted); font-size: 0.95rem; }

code {
  background: var(--accent-soft);
  color: var(--meta-blue-deep);
  padding: 0.12rem 0.4rem;
  border-radius: 5px;
  font-size: 0.88em;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

a { color: var(--accent); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--meta-blue);
  border-radius: 16px;
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow-sm);
  min-width: 0;
}

.card pre {
  max-width: 100%;
  box-sizing: border-box;
  overflow-x: auto;
  background: #0f172a;
  color: #e2e8f0;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.86rem;
  margin: 0.85rem 0;
}

.card pre.compact { font-size: 0.82rem; }

.section-head { margin-bottom: 1.25rem; }

/* ---------- Steps ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.4rem 1.4rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  /* Grid tracks default to min-content width, which lets long unbreakable
     strings (e.g. <code>core/protocols/feature_extractor.py</code>) push
     the card past its column. Setting min-width: 0 + overflow-wrap:
     anywhere lets the text wrap mid-token when needed. */
  min-width: 0;
  overflow-wrap: anywhere;
}

.step code {
  word-break: break-word;
}

.step:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.step-num {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--meta-blue) 0%, var(--meta-blue-light) 100%);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.85rem;
  box-shadow: 0 4px 10px rgba(0, 100, 224, 0.35);
}

.step p {
  font-size: 0.93rem;
  color: #334155;
  margin: 0;
}

/* ---------- Leaderboard ---------- */
.table-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

table.leaderboard {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

table.leaderboard th,
table.leaderboard td {
  padding: 0.95rem 1.1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

table.leaderboard tbody tr:last-child td { border-bottom: none; }

table.leaderboard thead th {
  background: #f8fafc;
  font-weight: 600;
  color: #475569;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-strong);
}

table.leaderboard tbody tr {
  transition: background 0.12s ease;
}

table.leaderboard tbody tr:hover { background: #f8fafc; }

tr.topline {
  background: linear-gradient(90deg, var(--topline-bg) 0%, #fffbeb 100%);
}
tr.topline:hover { background: #fde68a; }

tr.baseline {
  background: linear-gradient(90deg, var(--baseline-bg) 0%, #f0fdf4 100%);
}
tr.baseline:hover { background: #d1fae5; }

tr.offshelf {
  background: linear-gradient(90deg, var(--offshelf-bg) 0%, #f5f9ff 100%);
}
tr.offshelf:hover { background: #dbeafe; }

tr.reference {
  background: linear-gradient(90deg, var(--reference-bg) 0%, #faf8ff 100%);
}
tr.reference:hover { background: #ede9fe; }

tr.chance {
  background: var(--chance-bg);
  color: var(--muted);
  font-style: italic;
}
tr.chance .score { color: var(--muted); font-weight: 600; font-size: 0.95rem; }

.score {
  font-weight: 700;
  font-size: 1.05rem;
  color: #0f172a;
  font-variant-numeric: tabular-nums;
}

.std {
  color: var(--muted);
  font-size: 0.85rem;
  margin-left: 0.15rem;
  font-variant-numeric: tabular-nums;
}

.pill {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  margin-left: 0.45rem;
  vertical-align: middle;
  border: 1px solid;
}

.pill-topline {
  background: var(--topline-bg);
  color: var(--topline-text);
  border-color: var(--topline-border);
}

.pill-baseline {
  background: var(--baseline-bg);
  color: var(--baseline-text);
  border-color: var(--baseline-border);
}

.pill-offshelf {
  background: var(--offshelf-bg);
  color: var(--offshelf-text);
  border-color: var(--offshelf-border);
}

.pill-reference {
  background: var(--reference-bg);
  color: var(--reference-text);
  border-color: var(--reference-border);
}

/* ---------- Table titles ---------- */
.table-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #1e293b;
  margin: 2.25rem 0 0.35rem;
  letter-spacing: -0.01em;
}

#leaderboard .table-title:first-of-type { margin-top: 1.5rem; }

.table-subtitle {
  margin: 0 0 0.85rem;
  font-size: 0.9rem;
  max-width: 78ch;
}

/* ---------- Submit list ---------- */
#submit ul {
  margin: 0.5rem 0 0.75rem;
  padding-left: 1.2rem;
}

/* ---------- Eval families list (About card) ---------- */
.eval-families {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 1.25rem;
  display: grid;
  gap: 0.85rem;
}

.eval-families > li {
  background: #f8fafc;
  border: 1px solid var(--border);
  border-left: 3px solid var(--meta-blue);
  border-radius: 10px;
  padding: 0.85rem 1.1rem;
}

.eval-families > li > strong {
  display: block;
  font-size: 1rem;
  color: var(--meta-blue-deep);
  margin-bottom: 0.4rem;
}

.eval-families ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.25rem;
}

.eval-families ul li {
  font-size: 0.93rem;
  color: #334155;
  line-height: 1.55;
}

.eval-families .grp {
  font-weight: 600;
  color: #1e293b;
  margin-right: 0.25rem;
}

.eval-families .eval-note {
  margin: 0.55rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
  font-style: italic;
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  background: var(--surface);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
}

.footer-copyright {
  font-size: 0.9rem;
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--meta-blue);
  text-decoration: underline;
}

footer p { margin: 0; font-size: 0.9rem; color: var(--muted); }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .topnav { padding-bottom: 1.75rem; }
  .topnav-links a { margin-left: 0.95rem; font-size: 0.88rem; }
  .brand-name { display: none; }

  .org-strip { gap: 1rem 1.25rem; padding: 0.6rem 0.9rem; justify-content: center; }
  .org-strip img.logo-wide { height: 26px; }
  .org-strip img.logo-wide.logo-meta { height: 19px; }
  .org-strip img.logo-tall { height: 44px; transform: translateY(-4px); }

  .hero { padding: 1.5rem 0 4rem; }
  .hero-stats { gap: 1.5rem; }
  .stat-value { font-size: 1.35rem; }

  table.leaderboard { font-size: 0.85rem; }
  table.leaderboard th, table.leaderboard td { padding: 0.7rem 0.6rem; }
  .table-wrap { border-radius: 12px; overflow-x: auto; }

  .card { padding: 1.4rem 1.25rem; }
}