/* Odysseys — benchmark release site
   Aesthetic: calm academic paper site. Light cream background, readable serif,
   single restrained accent color. No flourishes. */

:root {
  --bg:        #fbf8f1;
  --bg-soft:   #f6f2e8;
  --panel:     #ffffff;
  --panel-soft:#f3efe4;
  --rule:      #e3dccc;
  --rule-hi:   #cfc7b2;

  --ink:       #1a1a17;
  --ink-2:     #3b3a35;
  --ink-dim:   #6e6a5e;
  --ink-mute:  #9a9582;

  --accent:    #7a3a2d;      /* muted brick — a single quiet color */
  --accent-hi: #8e4636;
  --link:      #3a5674;      /* subdued navy for links */
  --link-hi:   #243e5c;

  --easy:      #4a7d54;
  --medium:    #9a6f1a;
  --hard:      #8a3a2a;

  --serif: "Source Serif 4", "Source Serif Pro", "Charter", "Iowan Old Style", Georgia, serif;
  --mono:  "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans:  -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, sans-serif;

  --max: 1100px;
  --body: 720px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga";
}

img, video { max-width: 100%; display: block; }

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(58, 86, 116, 0.4);
}
a:hover { color: var(--link-hi); text-decoration-color: currentColor; }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--panel-soft);
  padding: 0.05em 0.35em;
  border-radius: 2px;
  color: var(--ink-2);
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* ------------ nav ------------ */
.nav {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px 28px;
  display: flex;
  align-items: baseline;
  gap: 30px;
}
.brand {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.005em;
}
.brand:hover { color: var(--accent); text-decoration: none; }
.nav-links {
  margin-left: auto;
  display: flex;
  gap: 24px;
  font-size: 15px;
}
.nav-links a {
  color: var(--ink-dim);
  text-decoration: none;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ------------ page layout ------------ */
.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 28px 80px;
}
.body-col {
  max-width: var(--body);
  margin: 0 auto;
}
.wide-col {
  max-width: 920px;
  margin: 0 auto;
}

/* ------------ home / title ------------ */
.title-block {
  max-width: var(--body);
  margin: 0 auto 48px;
}
.title-block h1 {
  font-size: 2.1rem;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.title-block .venue {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-mute);
  margin: 0 0 22px;
  letter-spacing: 0.02em;
}
.title-block .authors {
  font-size: 15px;
  color: var(--ink-dim);
  margin: 0 0 18px;
  font-style: italic;
}

.title-block.hero { margin-bottom: 40px; }
.hero-title {
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 600;
  line-height: 0.95;
  margin: 0 0 14px;
  letter-spacing: -0.025em;
  color: var(--ink);
}
.hero-full-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
  margin: 0 0 14px;
  letter-spacing: -0.005em;
  max-width: 640px;
}
.hero-sub {
  font-size: 17px;
  color: var(--ink-dim);
  line-height: 1.6;
  margin: 0;
  max-width: 640px;
}
.hero-authors {
  font-size: 15.5px;
  color: var(--ink);
  margin: 0 0 4px;
  line-height: 1.5;
}
.hero-authors a {
  color: var(--ink);
  text-decoration: none;
}
.hero-authors a:hover {
  color: var(--accent);
}
.hero-authors sup {
  color: var(--ink-dim);
  font-size: 10px;
  font-weight: 400;
}
.hero-aff {
  font-size: 14px;
  color: var(--ink-dim);
  margin: 0 0 20px;
  font-style: italic;
}
.hero-aff .hero-eq {
  font-style: normal;
  color: var(--ink-mute);
  font-size: 12.5px;
}

.paper-kicker {
  font-family: var(--serif);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.paper-authors {
  font-size: 15px;
  color: var(--ink);
  margin: 14px 0 4px;
  line-height: 1.5;
}
.paper-authors sup {
  color: var(--ink-dim);
  font-size: 10px;
}
.paper-aff {
  font-size: 13.5px;
  color: var(--ink-dim);
  margin: 0 0 14px;
  font-style: italic;
}
.paper-aff .paper-eq {
  font-style: normal;
  color: var(--ink-mute);
  font-size: 12px;
}
.paper-links {
  font-size: 13px;
  margin: 0;
  color: var(--ink-dim);
}
.paper-links a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(58, 86, 116, 0.3);
}
.paper-links a:hover {
  color: var(--link-hi);
  border-bottom-color: currentColor;
}
.paper-links .sep {
  color: var(--ink-mute);
  margin: 0 4px;
}

.abstract {
  max-width: var(--body);
  margin: 0 auto 40px;
  padding-left: 22px;
  border-left: 2px solid var(--rule);
  color: var(--ink-2);
  font-size: 16.5px;
  line-height: 1.65;
}
.abstract p { margin: 0 0 14px; }
.abstract p:last-child { margin-bottom: 0; }

.links-row {
  max-width: var(--body);
  margin: 0 auto 50px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 14px;
}
.page-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--rule-hi);
  border-radius: 3px;
  text-decoration: none;
  color: var(--ink);
  background: var(--panel);
  transition: background 0.15s, border-color 0.15s;
}
.page-link:hover {
  border-color: var(--accent);
  background: var(--panel-soft);
  color: var(--accent);
  text-decoration: none;
}
.page-link .arr { color: var(--ink-mute); font-size: 13px; }
.page-link:hover .arr { color: var(--accent); }

/* numbers — subtle inline row */
.numbers {
  max-width: var(--body);
  margin: 0 auto 40px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.numbers .n {
  padding: 0 16px;
  border-right: 1px solid var(--rule);
}
.numbers .n:last-child { border-right: none; }
.numbers .big {
  font-size: 1.9rem;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  font-feature-settings: "tnum", "lnum";
}
.numbers .lbl {
  margin-top: 6px;
  font-size: 13px;
  color: var(--ink-dim);
}

/* ------------ section headers ------------ */
.section {
  max-width: var(--body);
  margin: 0 auto;
  padding: 40px 0 10px;
}
.section.wide { max-width: 920px; }
.section h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.section .section-lead {
  color: var(--ink-dim);
  font-size: 15.5px;
  margin: 0 0 24px;
}

/* ------------ quick-link list on home ------------ */
.sitemap {
  max-width: var(--body);
  margin: 0 auto;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.sitemap a {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 20px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  text-decoration: none;
  transition: background 0.15s;
}
.sitemap a:hover { background: var(--panel-soft); text-decoration: none; }
.sitemap a:hover .sm-title { color: var(--accent); }
.sitemap .sm-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 4px;
  transition: color 0.15s;
}
.sitemap .sm-sub {
  color: var(--ink-dim);
  font-size: 14.5px;
  margin: 0;
}
.sitemap .sm-arrow {
  color: var(--ink-mute);
  font-size: 14px;
  padding-top: 4px;
}
.sitemap a:hover .sm-arrow { color: var(--accent); }

/* ------------ figures ------------ */
figure {
  margin: 26px 0;
  padding: 0;
}
figure img, figure video {
  border: 1px solid var(--rule);
  background: var(--panel);
  padding: 14px;
  border-radius: 2px;
}
figcaption {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-dim);
  line-height: 1.55;
  padding: 0 4px;
}
figcaption .fn {
  color: var(--ink);
  font-weight: 600;
  font-variant: small-caps;
  letter-spacing: 0.04em;
  margin-right: 4px;
}

/* ------------ leaderboard ------------ */
.lb-controls {
  max-width: 920px;
  margin: 0 auto 18px;
  display: flex;
  gap: 22px;
  align-items: baseline;
  flex-wrap: wrap;
  font-size: 14px;
  color: var(--ink-dim);
}
.lb-controls label {
  margin-right: 6px;
  color: var(--ink-dim);
}
.lb-controls select {
  background: var(--panel);
  border: 1px solid var(--rule-hi);
  color: var(--ink);
  padding: 5px 10px;
  border-radius: 2px;
  font-family: var(--serif);
  font-size: 14px;
}
.lb-controls select:focus { outline: none; border-color: var(--accent); }

.lb-table-wrap {
  max-width: 920px;
  margin: 0 auto;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.lb-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 15px;
}
.lb-table thead th {
  text-align: left;
  padding: 10px 14px;
  font-weight: 600;
  font-size: 13px;
  color: var(--ink-dim);
  border-bottom: 2px solid var(--ink);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
.lb-table thead th.num { text-align: right; }
.lb-table thead th:hover { color: var(--ink); }
.lb-table thead th.sorted { color: var(--accent); }
.lb-table thead th.sorted::after { content: " ↓"; font-size: 11px; }
.lb-table tbody td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--rule);
  vertical-align: baseline;
}
.lb-table tbody tr:last-child td { border-bottom: 1px solid var(--ink); }
.lb-table .rank {
  color: var(--ink-mute);
  width: 28px;
  display: inline-block;
  font-variant-numeric: tabular-nums;
}
.lb-table .model {
  font-weight: 600;
  color: var(--ink);
}
.lb-table .org {
  display: block;
  font-size: 13px;
  color: var(--ink-dim);
  font-weight: 400;
  font-style: italic;
  margin-top: 2px;
}
.lb-table td.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
}
.lb-table td.num.primary {
  color: var(--ink);
  font-weight: 600;
}
.lb-table .tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  padding: 1px 7px;
  border: 1px solid var(--rule-hi);
  border-radius: 2px;
  color: var(--ink-dim);
  text-transform: lowercase;
}
.lb-table tr.top .rank,
.lb-table tr.top .model { color: var(--accent); }

.lb-notes {
  max-width: 920px;
  margin: 18px auto 0;
  font-size: 13.5px;
  color: var(--ink-dim);
  line-height: 1.6;
}
.lb-notes strong { color: var(--ink); font-weight: 600; }

/* Breakdown — skimmable difficulty matrix */
.breakdown {
  max-width: 920px;
  margin: 22px auto 0;
}
.bd-matrix {
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--panel);
  overflow: hidden;
}
.bd-header,
.bd-row {
  display: grid;
  grid-template-columns: 190px 1fr 1fr 1fr;
  align-items: center;
}
.bd-header {
  padding: 14px 24px;
  background: var(--panel-soft);
  border-bottom: 1px solid var(--rule-hi);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.bd-header .bd-tier-head {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-right: 18px;
}
.bd-row {
  padding: 18px 24px;
  border-bottom: 1px solid var(--rule);
}
.bd-row:last-child { border-bottom: none; }
.bd-row:hover { background: rgba(243, 239, 228, 0.45); }
.bd-model-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.bd-model-org {
  font-size: 12px;
  color: var(--ink-dim);
  font-style: italic;
  margin-top: 2px;
}
.bd-cell { padding-right: 20px; }
.bd-cell-top {
  display: flex;
  align-items: center;
  gap: 10px;
}
.bd-bar {
  flex: 1;
  height: 8px;
  background: var(--panel-soft);
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--rule);
}
.bd-fill {
  height: 100%;
  transition: width 0.5s ease;
}
.bd-fill.easy   { background: var(--easy); }
.bd-fill.medium { background: var(--medium); }
.bd-fill.hard   { background: var(--hard); }
.bd-val {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  min-width: 40px;
  text-align: right;
}
.bd-sub {
  margin-top: 6px;
  font-size: 11.5px;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}
.tier-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  vertical-align: middle;
}
.tier-dot.easy   { background: var(--easy); }
.tier-dot.medium { background: var(--medium); }
.tier-dot.hard   { background: var(--hard); }

@media (max-width: 780px) {
  .bd-header,
  .bd-row {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 16px 18px;
  }
  .bd-header { display: none; }
  .bd-cell { padding-right: 0; }
  .bd-cell::before {
    content: attr(data-level);
    display: block;
    font-size: 11px;
    color: var(--ink-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
  }
}

/* ------------ viewer ------------ */
.viewer-layout {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 40px;
  min-width: 0;
}
.filters {
  position: sticky;
  top: 20px;
  align-self: start;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  font-size: 14px;
  padding-right: 8px;
}
.filters h3 {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}
.f-group { margin-bottom: 20px; }
.f-label {
  display: block;
  font-size: 12px;
  color: var(--ink-dim);
  margin-bottom: 8px;
  font-weight: 600;
}
.filters input[type="text"], .filters select {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--rule-hi);
  color: var(--ink);
  padding: 7px 10px;
  border-radius: 2px;
  font-family: var(--serif);
  font-size: 14px;
}
.filters input[type="text"]:focus, .filters select:focus {
  outline: none;
  border-color: var(--accent);
}

.pills { display: flex; flex-wrap: wrap; gap: 5px; }
.pill {
  padding: 4px 10px;
  font-size: 12px;
  background: var(--panel);
  border: 1px solid var(--rule-hi);
  color: var(--ink-dim);
  cursor: pointer;
  border-radius: 2px;
  font-family: var(--serif);
  user-select: none;
}
.pill:hover { border-color: var(--ink-mute); color: var(--ink); }
.pill.active {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.pill.easy.active    { background: var(--easy);   border-color: var(--easy); }
.pill.medium.active  { background: var(--medium); border-color: var(--medium); }
.pill.hard.active    { background: var(--hard);   border-color: var(--hard); }

.pill.small {
  width: 100%;
  text-align: center;
  padding: 7px 10px;
  margin-top: 6px;
}

.result-head {
  margin-bottom: 14px;
  color: var(--ink-dim);
  font-size: 14px;
}
.result-head strong { color: var(--ink); font-weight: 600; }

.task-list {
  display: grid;
  gap: 14px;
}
.task {
  background: var(--panel);
  border: 1px solid var(--rule);
  padding: 18px 22px;
  border-radius: 2px;
  cursor: pointer;
  min-width: 0;
  overflow-wrap: anywhere;
}
.task:hover { border-color: var(--rule-hi); }
.task.open { border-color: var(--ink-mute); background: var(--bg); }
.task .head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 8px;
  font-size: 13px;
}
.task .meta {
  display: flex;
  gap: 12px;
  color: var(--ink-dim);
  flex-shrink: 0;
}
.task .id {
  font-family: var(--mono);
  color: var(--ink-mute);
  font-size: 12px;
}
.task .level {
  font-weight: 600;
  text-transform: lowercase;
}
.task .level.easy   { color: var(--easy); }
.task .level.medium { color: var(--medium); }
.task .level.hard   { color: var(--hard); }
.task .prompt {
  margin: 0;
  font-size: 15.5px;
  color: var(--ink-2);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  overflow-wrap: anywhere;
  min-width: 0;
}
.task.open .prompt {
  -webkit-line-clamp: unset;
  color: var(--ink);
}
.task .cats {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.task .cat {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
}
.task .rubrics-detail {
  display: none;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}
.task.open .rubrics-detail { display: block; }
.rubrics-detail h5 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  margin: 0 0 12px;
  font-weight: 600;
}
.rubric-item {
  padding: 12px 0 12px 16px;
  border-left: 2px solid var(--rule-hi);
  margin-bottom: 10px;
  font-size: 14.5px;
}
.rubric-item:last-child { margin-bottom: 0; }
.rubric-item .rid {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--ink);
  margin-right: 6px;
  font-size: 13px;
}
.rubric-item .weight {
  float: right;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
}
.rubric-item .req { color: var(--ink-2); line-height: 1.55; }
.rubric-item .verif {
  margin-top: 6px;
  color: var(--ink-dim);
  font-size: 13px;
  font-style: italic;
  line-height: 1.5;
}

.empty {
  padding: 40px;
  text-align: center;
  color: var(--ink-mute);
  border: 1px dashed var(--rule-hi);
  border-radius: 2px;
  font-style: italic;
}

/* ------------ paper walkthrough ------------ */
.paper-layout {
  max-width: 1240px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 56px;
}
.paper-toc {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  font-size: 13px;
  padding-left: 0;
  border-left: 1px solid var(--rule);
  padding: 6px 0 6px 16px;
}
.paper-toc h4 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  margin: 0 0 12px;
}
.paper-toc ul { list-style: none; margin: 0; padding: 0; }
.paper-toc li { margin: 0; }
.paper-toc a {
  display: block;
  color: var(--ink-dim);
  text-decoration: none;
  padding: 5px 0 5px 12px;
  border-left: 2px solid transparent;
  margin-left: -18px;
  padding-left: 16px;
}
.paper-toc a:hover { color: var(--ink); }
.paper-toc a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.paper-body {
  max-width: 980px;
  min-width: 0;
}
.paper-body > section > p,
.paper-body > section > ul,
.paper-body > section > ol,
.paper-body > section > h2,
.paper-body > section > h3,
.paper-body > section > figure,
.paper-body > section > .note,
.paper-body > section > .two-col {
  max-width: var(--body);
}
.paper-body section {
  margin-bottom: 64px;
  scroll-margin-top: 24px;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.paper-body section.visible,
.paper-body section:first-child {
  opacity: 1;
  transform: none;
}
.paper-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 18px;
  color: var(--ink);
  letter-spacing: -0.01em;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}
.paper-body h3 {
  font-size: 1.08rem;
  font-weight: 600;
  margin: 34px 0 12px;
  color: var(--ink);
}
.paper-body p {
  margin: 0 0 18px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.78;
}
.paper-body p:last-child { margin-bottom: 0; }
.paper-body section > p:first-of-type {
  font-size: 18px;
  color: var(--ink);
  line-height: 1.72;
}
.paper-body ul, .paper-body ol {
  margin: 0 0 20px;
  padding-left: 22px;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.72;
}
.paper-body ul li, .paper-body ol li {
  margin-bottom: 8px;
}
.paper-body ul li:last-child, .paper-body ol li:last-child {
  margin-bottom: 0;
}
.paper-body strong { color: var(--ink); font-weight: 600; }
.paper-body .formula {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--ink);
  padding: 14px 20px;
  margin: 14px 0 18px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 2px;
  text-align: center;
  letter-spacing: 0.02em;
}

/* Reading progress bar */
.reading-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: var(--accent);
  z-index: 100;
  transition: width 0.1s linear;
}

/* Animated number callouts in the paper */
.paper-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0;
  margin: 20px 0 24px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 20px 0;
}
.paper-stats .ps {
  padding: 0 18px;
  border-right: 1px solid var(--rule);
  text-align: left;
}
.paper-stats .ps:last-child { border-right: none; }
.paper-stats .ps-num {
  font-size: 2rem;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.paper-stats .ps-num .unit {
  font-size: 1.1rem;
  color: var(--ink-dim);
  font-weight: 500;
  margin-left: 2px;
}
.paper-stats .ps-lbl {
  margin-top: 8px;
  font-size: 12.5px;
  color: var(--ink-dim);
  line-height: 1.4;
}

/* Interactive metric toggle in Results section */
.metric-toggle {
  margin: 18px 0 22px;
  padding: 22px 24px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 2px;
}
.metric-toggle .mt-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}
.metric-toggle .mt-pills {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.metric-toggle .mt-pill {
  padding: 6px 14px;
  font-family: var(--serif);
  font-size: 13.5px;
  background: var(--bg);
  color: var(--ink-dim);
  border: 1px solid var(--rule-hi);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s;
}
.metric-toggle .mt-pill:hover {
  color: var(--ink);
  border-color: var(--ink-mute);
}
.metric-toggle .mt-pill.active {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.metric-toggle .mt-list {
  display: grid;
  gap: 10px;
}
.metric-toggle .mt-row {
  display: grid;
  grid-template-columns: 1.3fr 1fr 50px;
  align-items: center;
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--rule);
}
.metric-toggle .mt-row:last-child { border-bottom: none; }
.metric-toggle .mt-name {
  font-size: 14.5px;
  color: var(--ink);
  font-weight: 600;
}
.metric-toggle .mt-name .mt-org {
  display: block;
  font-size: 11.5px;
  font-style: italic;
  color: var(--ink-dim);
  font-weight: 400;
  margin-top: 2px;
}
.metric-toggle .mt-bar {
  height: 6px;
  background: var(--panel-soft);
  border: 1px solid var(--rule);
  border-radius: 2px;
  overflow: hidden;
}
.metric-toggle .mt-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.6s cubic-bezier(0.25, 0.8, 0.3, 1);
}
.metric-toggle .mt-val {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.metric-toggle .mt-desc {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: 13.5px;
  color: var(--ink-dim);
  line-height: 1.55;
}

/* Figures — hover lift + click-to-zoom */
figure { cursor: zoom-in; }
figure img {
  transition: transform 0.35s ease, border-color 0.25s;
}
figure:hover img {
  border-color: var(--rule-hi);
  transform: translateY(-1px);
}

.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(15, 13, 10, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px;
  z-index: 200;
  cursor: zoom-out;
  backdrop-filter: blur(3px);
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 100%;
  max-height: 92vh;
  border-radius: 2px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}
.lightbox .lb-close {
  position: absolute;
  top: 22px;
  right: 28px;
  color: rgba(255,255,255,0.7);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* =========================================================================
   Interactive Task Explorer
   ========================================================================= */
.task-explorer {
  margin: 24px 0 30px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 3px;
  overflow: hidden;
  max-width: 980px;
}
.te-head {
  padding: 14px 18px 0;
  border-bottom: 1px solid var(--rule);
}
.te-label {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 10px;
}
.te-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  padding-bottom: 14px;
}
.te-chip {
  padding: 7px 12px;
  font-family: var(--serif);
  font-size: 12.5px;
  background: var(--bg);
  color: var(--ink-dim);
  border: 1px solid var(--rule-hi);
  border-radius: 2px;
  cursor: pointer;
  text-align: left;
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all 0.15s;
}
.te-chip:hover { color: var(--ink); border-color: var(--ink-mute); }
.te-chip.active {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.te-titlebar {
  padding: 14px 22px 12px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.te-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
  line-height: 1.35;
  letter-spacing: -0.005em;
  flex: 1;
  min-width: 0;
}
.te-meta {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 12px;
  flex-shrink: 0;
}
.te-level {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 8px;
  border-radius: 2px;
  color: #fff;
}
.te-level.easy { background: var(--easy); }
.te-level.medium { background: var(--medium); }
.te-level.hard { background: var(--hard); }
.te-model {
  color: var(--ink);
  font-weight: 600;
}
.te-score {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
}
.te-video-wrap {
  background: #0e0e0e;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 280px;
  max-height: 440px;
  overflow: hidden;
}
.te-video-wrap video {
  width: 100%;
  height: 100%;
  max-height: 440px;
  background: #0e0e0e;
  object-fit: contain;
  display: block;
  border: none;
  padding: 0;
  border-radius: 0;
  transition: none;
}
.te-video-wrap video:hover { transform: none; border: none; }

.te-prompt-details {
  padding: 10px 22px 14px;
  border-top: 1px solid var(--rule);
  background: var(--bg);
}
.te-prompt-details summary {
  cursor: pointer;
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  user-select: none;
  padding: 4px 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.te-prompt-details summary::-webkit-details-marker { display: none; }
.te-prompt-details summary::before {
  content: "▸";
  display: inline-block;
  transition: transform 0.15s;
  color: var(--ink-mute);
}
.te-prompt-details[open] summary::before {
  transform: rotate(90deg);
}
.te-prompt-details summary:hover { color: var(--ink); }
.te-prompt-details .te-prompt {
  margin: 10px 0 0;
  color: var(--ink-2);
  line-height: 1.6;
  font-size: 13px;
  max-height: 200px;
  overflow-y: auto;
  padding-right: 8px;
}
.te-prompt::-webkit-scrollbar { width: 6px; }
.te-prompt::-webkit-scrollbar-thumb { background: var(--rule-hi); border-radius: 3px; }

/* Synced rubric timeline */
.te-timeline {
  padding: 14px 22px 18px;
  border-top: 1px solid var(--rule);
  background: #f8f4e8;
}
.te-tl-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}
.te-tl-title {
  font-size: 11.5px;
  color: var(--ink-dim);
  font-style: italic;
}
.te-tl-step {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.te-tl-body {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 6px 16px;
  position: relative;
  align-items: center;
}
.tl-empty {
  grid-column: 1 / -1;
  color: var(--ink-mute);
  font-style: italic;
  padding: 8px 0;
  font-size: 12px;
}
.tl-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11.5px;
  cursor: pointer;
  overflow: hidden;
  min-width: 0;
  padding: 2px 0;
  user-select: none;
}
.tl-label:hover .tl-req { color: var(--ink); }
.tl-mark {
  font-family: var(--mono);
  color: var(--ink-mute);
  font-size: 14px;
  width: 14px;
  flex-shrink: 0;
  text-align: center;
  transition: color 0.2s;
}
.tl-label.passed .tl-mark { color: var(--easy); font-weight: 700; }
.tl-key {
  font-family: var(--mono);
  color: var(--ink);
  font-weight: 600;
  font-size: 10.5px;
  flex-shrink: 0;
}
.tl-req {
  color: var(--ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  font-size: 11.5px;
  transition: color 0.15s;
}
.tl-track {
  position: relative;
  height: 12px;
  cursor: pointer;
}
.tl-cells {
  display: flex;
  gap: 1px;
  height: 100%;
  width: 100%;
}
.tlc {
  flex: 1;
  min-width: 1px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 1px;
}
.tlc.f {
  background: var(--easy);
  border-color: var(--easy);
}

/* Cumulative "task score" summary row */
.tl-summary-label {
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1px solid var(--rule);
}
.tl-summary-track {
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1px solid var(--rule);
  height: 16px;
}
.tl-summary-label .tl-key {
  color: var(--accent);
  font-size: 10px;
  letter-spacing: 0.04em;
}
.tl-summary-label .tl-mark {
  color: var(--accent);
  font-size: 15px;
}
.tl-summary-label.passed .tl-mark { color: var(--easy); }
.tl-summary-label .tl-req {
  color: var(--ink);
  font-weight: 600;
  font-style: italic;
}
.te-tl-cursor {
  position: absolute;
  top: -2px;
  bottom: -2px;
  width: 2px;
  background: var(--accent);
  pointer-events: none;
  transform: translateX(-1px);
  z-index: 3;
  box-shadow: 0 0 6px rgba(122, 58, 45, 0.55);
  transition: left 0.08s linear;
  display: none;
}
.te-tl-cursor::before {
  content: "";
  position: absolute;
  top: -4px;
  left: -3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px rgba(122, 58, 45, 0.6);
}

@media (max-width: 860px) {
  .te-titlebar { padding: 12px 18px 10px; }
  .te-title { font-size: 14.5px; }
  .te-video-wrap { min-height: 220px; max-height: 300px; }
  .te-tl-body { grid-template-columns: 120px 1fr; }
  .tl-req { display: none; }
}

/* =========================================================================
   Interactive charts (SVG line/bar charts)
   ========================================================================= */
.chart-wrap {
  position: relative;
  margin: 20px 0 30px;
  padding: 18px 22px 14px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 3px;
  max-width: 980px;
}
.chart-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.005em;
  margin-bottom: 6px;
}
.chart-metric-toggle {
  display: flex;
  gap: 5px;
  margin-bottom: 14px;
}
.cm-pill {
  padding: 4px 10px;
  font-family: var(--serif);
  font-size: 11.5px;
  background: var(--bg);
  color: var(--ink-dim);
  border: 1px solid var(--rule-hi);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.15s;
}
.cm-pill:hover { color: var(--ink); border-color: var(--ink-mute); }
.cm-pill.active {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.interactive-chart {
  width: 100%;
  height: auto;
  overflow: visible;
  cursor: default;
  display: block;
}
.interactive-chart text {
  user-select: none;
  pointer-events: none;
}
.chart-hint {
  font-family: var(--serif);
  font-size: 11.5px;
  font-style: italic;
  color: var(--ink-mute);
  margin-top: 6px;
  text-align: right;
}
.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--ink);
  color: var(--bg);
  font-size: 12px;
  padding: 10px 13px;
  border-radius: 2px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  opacity: 0;
  transition: opacity 0.12s;
  z-index: 30;
  min-width: 150px;
  line-height: 1.4;
}
.chart-tooltip .ct-step {
  font-family: var(--mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.55);
  margin-bottom: 6px;
  padding-bottom: 5px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.chart-tooltip .ct-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  padding: 2px 0;
}
.chart-tooltip .ct-swatch {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 1px;
  flex-shrink: 0;
}
.chart-tooltip .ct-val {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: #fff;
  font-weight: 600;
}


.note {
  margin: 20px 0;
  padding: 14px 18px;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 2px;
  font-size: 15.5px;
  color: var(--ink-2);
}
.note p { margin: 0; font-size: inherit; line-height: 1.6; }
.note .lbl {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 4px;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 18px 0;
}
.two-col .card {
  background: var(--panel);
  border: 1px solid var(--rule);
  padding: 18px 20px;
  border-radius: 2px;
}
.two-col .card h4 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}
.two-col .card .tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.two-col .card p {
  font-size: 14.5px;
  color: var(--ink-2);
  margin: 0 0 8px;
  line-height: 1.55;
}
.two-col .card p:last-child { margin-bottom: 0; }
.two-col .card .num {
  font-weight: 600;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ------------ videos ------------ */
.video-featured {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin: 16px 0 10px;
}
.video-feat {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 2px;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  overflow: hidden;
}
.video-feat video {
  width: 100%;
  height: 100%;
  min-height: 260px;
  background: #0e0e0e;
  object-fit: contain;
  display: block;
  border: none;
  padding: 0;
  border-radius: 0;
}
.video-feat .vf-body {
  padding: 22px 26px;
  border-left: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.video-feat .vf-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
  margin-bottom: 6px;
  display: block;
  letter-spacing: 0.02em;
}
.video-feat .vf-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--ink);
  line-height: 1.25;
}
.video-feat .vf-sub {
  font-size: 14.5px;
  color: var(--ink-2);
  margin: 0 0 10px;
  line-height: 1.6;
}
.video-feat .vf-sub:last-child { margin-bottom: 0; }
.video-feat .vf-meta {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-mute);
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  margin-top: 14px;
}
.video-card {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 2px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.video-card video {
  width: 100%;
  aspect-ratio: 12 / 5;
  background: #0e0e0e;
  object-fit: contain;
  display: block;
  border: none;
  padding: 0;
  border-radius: 0;
}
.video-card .vc-body {
  padding: 12px 14px 14px;
}
.video-card .vc-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-dim);
  margin-bottom: 3px;
  display: block;
}
.video-card .vc-title {
  font-size: 14.5px;
  font-weight: 600;
  margin: 0 0 3px;
  color: var(--ink);
  line-height: 1.35;
}
.video-card .vc-sub {
  font-size: 13px;
  color: var(--ink-dim);
  margin: 0;
  line-height: 1.5;
}

@media (max-width: 780px) {
  .video-feat { grid-template-columns: 1fr; }
  .video-feat .vf-body { border-left: none; border-top: 1px solid var(--rule); }
}

/* ------------ footer ------------ */
footer {
  max-width: var(--max);
  margin: 80px auto 0;
  padding: 28px 28px 40px;
  border-top: 1px solid var(--rule);
  font-size: 13.5px;
  color: var(--ink-dim);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
footer a { color: var(--ink-dim); }
footer a:hover { color: var(--accent); }

/* ------------ responsive ------------ */
@media (max-width: 860px) {
  .viewer-layout { grid-template-columns: 1fr; gap: 24px; }
  .filters { position: static; max-height: none; border-bottom: 1px solid var(--rule); padding-bottom: 16px; }
  .paper-layout { grid-template-columns: 1fr; gap: 28px; }
  .paper-toc { position: static; max-height: none; border-left: none; padding-left: 0; padding-bottom: 18px; border-bottom: 1px solid var(--rule); }
  .paper-toc a { margin-left: 0; padding-left: 10px; }
  .two-col { grid-template-columns: 1fr; }
  .numbers { grid-template-columns: repeat(2, 1fr); gap: 0; }
  .numbers .n:nth-child(2) { border-right: none; }
  .numbers .n:nth-child(1), .numbers .n:nth-child(2) { padding-bottom: 16px; margin-bottom: 16px; border-bottom: 1px solid var(--rule); }
  .page { padding: 36px 22px 60px; }
  .nav-inner { padding: 14px 22px; flex-wrap: wrap; gap: 16px; }
  .nav-links { gap: 16px; font-size: 14px; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .title-block h1 { font-size: 1.75rem; }
  .lb-table { font-size: 13.5px; }
  .lb-table thead th { font-size: 11.5px; padding: 8px 8px; }
  .lb-table tbody td { padding: 11px 8px; }
}

.hidden { display: none !important; }