/* ==========================================================================
   dTRPO Project Page – Stylesheet
   Fonts: Google Sans (headings) + Noto Sans (body) — from 3DCompat v2
   Colors: Deep blue accent + gray text — from wx-zhang.github.io
   ========================================================================== */

:root {
  --blue: #004EA2;
  --blue-light: #1a6fc4;
  --body-text: #595959;
  --heading-text: #222;
  --bg-white: #ffffff;
  --bg-off: #f8f8f8;
  --bg-section: #f4f4f4;
  --border: #e5e5e5;
  --border-dark: #e0e0e0;
  --muted: #7a7a7a;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans", sans-serif;
  color: var(--body-text);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Layout ---------- */
.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-wide {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 48px 0;
}

section + section {
  border-top: 1px solid var(--border);
}

/* ---------- Hero / Title ---------- */
.hero {
  text-align: center;
  padding: 64px 0 32px;
}

.hero .venue {
  font-family: "Google Sans", sans-serif;
  font-weight: 600;
  color: var(--blue);
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-family: "Google Sans", sans-serif;
  font-weight: 600;
  color: var(--heading-text);
  font-size: 2.4rem;
  line-height: 1.2;
  margin-bottom: 24px;
}

.hero h1 .method-name {
  color: var(--blue);
}

/* ---------- Authors ---------- */
.authors {
  font-family: "Google Sans", sans-serif;
  font-size: 1.05rem;
  text-align: center;
  margin-bottom: 8px;
  line-height: 1.8;
}

.authors a {
  color: var(--blue);
  text-decoration: none;
}

.authors a:hover {
  text-decoration: underline;
}

.authors .equal {
  font-size: 0.75rem;
  vertical-align: super;
}

.authors .corresponding {
  font-size: 0.75rem;
  vertical-align: super;
}

.affiliations {
  font-family: "Google Sans", sans-serif;
  font-size: 0.95rem;
  text-align: center;
  color: var(--muted);
  margin-bottom: 24px;
}

.affiliations sup {
  font-size: 0.7rem;
  margin-right: 2px;
}

/* ---------- Links row ---------- */
.links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border: 1.5px solid var(--blue);
  border-radius: 24px;
  font-family: "Google Sans", sans-serif;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--blue);
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}

.links a:hover {
  background: var(--blue);
  color: #fff;
}

.links a i,
.links a .icon {
  font-size: 1.1rem;
}

/* ---------- Demo / Animation ---------- */
.demo-section {
  padding: 32px 0 48px;
}

.demo-wrapper {
  display: flex;
  gap: 32px;
  align-items: stretch;
}

.demo-panel {
  flex: 1;
  background: var(--bg-off);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.demo-panel h3 {
  font-family: "Google Sans", sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--heading-text);
  margin-bottom: 12px;
  text-align: center;
}

.demo-panel svg {
  width: 100%;
  height: auto;
  display: block;
}

.demo-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
}

.demo-controls button {
  font-family: "Google Sans", sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 16px;
  border: 1.5px solid var(--blue);
  border-radius: 20px;
  background: transparent;
  color: var(--blue);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.demo-controls button:hover,
.demo-controls button.active {
  background: var(--blue);
  color: #fff;
}

.speed-control {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--muted);
}

.speed-control input[type="range"] {
  width: 120px;
  accent-color: var(--blue);
}

.demo-caption {
  font-size: 0.9rem;
  color: var(--body-text);
  line-height: 1.65;
  margin-top: 16px;
  text-align: justify;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Section headings ---------- */
.section-title {
  font-family: "Google Sans", sans-serif;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--heading-text);
  margin-bottom: 20px;
  text-align: center;
}

/* ---------- Section description ---------- */
.section-desc {
  text-align: center;
  margin-bottom: 20px;
}

/* ---------- Abstract ---------- */
.abstract p {
  font-size: 1.02rem;
  line-height: 1.75;
  text-align: justify;
}

/* ---------- Method ---------- */
.method-content {
  line-height: 1.75;
}

.method-content h3 {
  font-family: "Google Sans", sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--heading-text);
  margin: 28px 0 12px;
}

.method-content h3:first-child {
  margin-top: 0;
}

.method-content p {
  margin-bottom: 16px;
}

.method-figure {
  text-align: center;
  margin: 24px 0;
}

.method-figure img {
  max-width: 100%;
  border-radius: 6px;
}

.method-figure .caption {
  font-size: 0.88rem;
  color: var(--muted);
  margin-top: 8px;
}

/* ---------- Equations ---------- */
.equation-block {
  background: var(--bg-off);
  border-radius: 6px;
  padding: 3px 20px;
  margin: 6px 0;
  overflow-x: auto;
}

/* ---------- Results table ---------- */
.results-table-wrapper {
  overflow-x: auto;
  margin: 16px 0;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  white-space: nowrap;
}

.results-table th,
.results-table td {
  padding: 10px 14px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.results-table thead th {
  font-family: "Google Sans", sans-serif;
  font-weight: 600;
  color: var(--heading-text);
  background: var(--bg-section);
  border-bottom: 2px solid var(--border-dark);
}

.results-table thead th .bench-sub {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--muted);
}

.results-table tbody td:first-child {
  text-align: left;
  font-weight: 500;
}

.results-table .section-row td {
  font-style: italic;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
  background: var(--bg-off);
  border-bottom: 1px solid var(--border);
}

.results-table .highlight-row {
  background: rgba(0, 78, 162, 0.06);
}

.results-table .highlight-row td {
  font-weight: 600;
}

.best {
  color: var(--blue);
  font-weight: 700;
}

/* ---------- Qualitative results ---------- */
.qual-section {
  padding: 48px 0;
}

.qual-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.qual-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-white);
}

.qual-card .qual-header {
  font-family: "Google Sans", sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 10px 14px;
  background: var(--bg-section);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.qual-card .qual-body {
  padding: 14px;
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre-wrap;
  max-height: 320px;
  overflow-y: auto;
}

.qual-card .qual-body .token-correct {
  color: #2d8a4e;
}

.qual-card .qual-body .token-error {
  color: #d32f2f;
}

.qual-prompt {
  background: var(--bg-off);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 20px;
  font-size: 0.92rem;
  line-height: 1.6;
}

.qual-prompt strong {
  color: var(--heading-text);
}

.qual-nav {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

.qual-nav button {
  font-family: "Google Sans", sans-serif;
  font-size: 0.82rem;
  padding: 5px 14px;
  border: 1.5px solid var(--border-dark);
  border-radius: 16px;
  background: var(--bg-white);
  color: var(--body-text);
  cursor: pointer;
  transition: all 0.2s;
}

.qual-nav button:hover,
.qual-nav button.active {
  border-color: var(--blue);
  color: var(--blue);
  background: rgba(0, 78, 162, 0.04);
}

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 32px 0;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

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

.footer a:hover {
  text-decoration: underline;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero {
    padding: 40px 0 20px;
  }

  .hero h1 {
    font-size: 1.4rem;
    line-height: 1.3;
  }

  .authors {
    font-size: 0.85rem;
    line-height: 1.6;
  }

  .affiliations {
    font-size: 0.8rem;
  }

  .links {
    gap: 8px;
  }

  .links a {
    padding: 6px 12px;
    font-size: 0.82rem;
  }

  .demo-wrapper {
    flex-direction: column;
  }

  .demo-panel {
    padding: 12px;
  }

  .demo-panel h3 {
    font-size: 0.85rem;
  }

  .demo-caption {
    font-size: 0.82rem;
  }

  section {
    padding: 32px 0;
  }

  .section-title {
    font-size: 1.3rem;
  }

  .abstract p {
    font-size: 0.92rem;
  }

  .method-content h3 {
    font-size: 1rem;
  }

  .method-content p {
    font-size: 0.92rem;
  }

  .equation-block {
    padding: 3px 10px;
    font-size: 0.85rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .results-table {
    font-size: 0.75rem;
  }

  .results-table th,
  .results-table td {
    padding: 6px 8px;
  }

  .qual-grid {
    grid-template-columns: 1fr;
  }

  .qual-nav {
    flex-wrap: wrap;
    gap: 6px;
  }

  .qual-nav button {
    font-size: 0.78rem;
    padding: 4px 10px;
  }

  .qual-card .qual-header {
    font-size: 0.82rem;
  }

  .qual-card .qual-body {
    font-size: 0.8rem;
    max-height: 250px;
  }

  .qual-prompt {
    font-size: 0.85rem;
  }

  .container, .container-wide {
    padding: 0 12px;
  }

  .speed-control {
    font-size: 0.75rem;
  }

  .demo-controls button {
    font-size: 0.78rem;
    padding: 5px 12px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.15rem;
  }

  .authors {
    font-size: 0.78rem;
  }

  .results-table {
    font-size: 0.68rem;
  }

  .results-table th,
  .results-table td {
    padding: 4px 5px;
  }

  .results-table thead th .bench-sub {
    font-size: 0.6rem;
  }
}

/* ---------- MathJax overrides ---------- */
.MathJax {
  font-size: 1em !important;
}


/* Math inside SVG foreignObject */
svg foreignObject {
  overflow: visible;
}

/* Smooth fade-in for animated SVG groups */
svg g[id^="rp-"] {
  transition: opacity 0.4s ease-in-out;
}

/* Smooth color transitions for token boxes */
svg rect {
  transition: fill 0.3s ease;
}