/* ===========================
   Base & Reset
   =========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fb;
  --color-text: #1a1a2e;
  --color-text-muted: #5a6277;
  --color-accent: #3b5bdb;
  --color-accent-light: #e7ecfd;
  --color-teacher: #fffbe6;
  --color-teacher-border: #ffe066;
  --color-ours: #eef2ff;
  --color-ours-border: #748ffc;
  --color-delta: #f0fff4;
  --color-delta-text: #2f7a3c;
  --color-abl-oneshot: #9bd2df;
  --color-abl-iteronly: #809bc3;
  --color-abl-ours: #8175f1;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, serif;
  --radius: 10px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
  line-height: 1.7;
}

/* ===========================
   Layout
   =========================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.container.narrow {
  max-width: 820px;
}

/* ===========================
   Hero / Title
   =========================== */
.hero {
  background: linear-gradient(135deg, #1e2d5f 0%, #3b5bdb 60%, #5c7cfa 100%);
  color: #fff;
  padding: 80px 24px 64px;
  text-align: center;
}

.paper-title {
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.authors {
  display: flex;
  gap: 28px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.author {
  font-weight: 500;
}

.affiliations {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 0.92rem;
  opacity: 0.85;
  margin-bottom: 6px;
}

.equal-note {
  font-size: 0.82rem;
  opacity: 0.75;
  margin-bottom: 36px;
}

.buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

.btn-primary {
  background: #fff;
  color: #3b5bdb;
}

.btn-secondary {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1.5px solid rgba(255,255,255,0.5);
}

/* ===========================
   Sections
   =========================== */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 32px;
  text-align: center;
  letter-spacing: -0.01em;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin: 10px auto 0;
}

.subsection-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 52px;
  margin-bottom: 16px;
  color: var(--color-text);
  border-left: 4px solid var(--color-accent);
  padding-left: 14px;
}

.section-intro {
  margin: 0 0 28px;
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.75;
}

/* ===========================
   Abstract
   =========================== */
.abstract-text {
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.85;
  color: #2c2c3e;
  text-align: justify;
}

/* ===========================
   Figures
   =========================== */
.figure-block {
  margin: 24px 0 8px;
}

.figure-img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid #e8eaf0;
  box-shadow: var(--shadow);
  display: block;
}

figcaption {
  margin-top: 12px;
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  text-align: center;
}

.figure-medium {
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ===========================
   Stats Grid
   =========================== */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 24px;
}

@media (max-width: 680px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* ===========================
   Setup Cards
   =========================== */
.setup-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

@media (max-width: 760px) {
  .setup-grid {
    grid-template-columns: 1fr;
  }
}

.setup-card {
  background: var(--color-bg);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid #e2e8f0;
}

.setup-card h4 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 8px;
  font-weight: 600;
}

.setup-card p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.domain-tag {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 4px;
  margin: 2px 2px;
}

/* ===========================
   Tables
   =========================== */
.table-wrapper {
  overflow-x: auto;
  margin: 16px 0;
  border-radius: var(--radius);
  border: 1px solid #e2e8f0;
}

.table-wrapper-narrow {
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.table-wrapper-main {
  margin-left: auto;
  margin-right: auto;
}

.results-table-main {
  font-size: 0.82rem;
}

.results-table-main th,
.results-table-main td {
  padding: 8px 10px;
}

.results-table-main td:first-child {
  min-width: 220px;
  white-space: normal;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  white-space: nowrap;
}

.results-table th {
  background: #f1f3f9;
  padding: 10px 14px;
  text-align: center;
  font-weight: 600;
  font-size: 0.82rem;
  color: #3a3f5c;
  border-bottom: 2px solid #dde1ef;
}

.results-table th:first-child {
  text-align: left;
}

.results-table td {
  padding: 9px 14px;
  text-align: center;
  border-bottom: 1px solid #edf0f7;
}

.results-table td:first-child {
  text-align: left;
  white-space: normal;
  min-width: 180px;
}

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

.results-table tbody tr:hover {
  background: #f8f9ff;
}

.avg-col {
  background: #f5f6fa;
}

.section-header-row td {
  background: #f7f8fd !important;
  padding: 6px 14px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.teacher-row {
  background: var(--color-teacher) !important;
}

.ours-row {
  background: var(--color-ours) !important;
}

.delta-row td {
  background: var(--color-delta);
  color: var(--color-delta-text);
  font-weight: 600;
  font-size: 0.85rem;
}

.divider-row td {
  padding: 2px;
  background: #edf0f7;
}

.abl-oneshot {
  background: color-mix(in srgb, var(--color-abl-oneshot) 15%, white) !important;
}

.abl-iteronly {
  background: color-mix(in srgb, var(--color-abl-iteronly) 15%, white) !important;
}

.table-caption {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.table-note {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin-top: 12px;
}

/* ===========================
   Highlight Numbers
   =========================== */
.highlight-boxes {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 36px 0 24px;
}

.highlight-box {
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius);
  padding: 20px 32px;
  text-align: center;
  min-width: 160px;
}

.highlight-num {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
}

.highlight-label {
  font-size: 1rem;
  opacity: 0.85;
  margin-top: 6px;
  line-height: 1.4;
}

/* ===========================
   Finding Box
   =========================== */
.finding-box {
  background: linear-gradient(135deg, #eef2ff 0%, #f0f7ff 100%);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 28px 0;
}

.finding-box h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.finding-box p {
  font-size: 1rem;
  color: #2c3058;
  line-height: 1.65;
}

/* ===========================
   Method Cards
   =========================== */
.method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  margin-top: 36px;
}

@media (max-width: 900px) {
  .method-grid {
    grid-template-columns: 1fr;
  }
}

.method-card {
  background: var(--color-bg);
  border-radius: 14px;
  border: 1.5px solid #e2e8f0;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.method-card-header {
  background: linear-gradient(135deg, #3b5bdb 0%, #5c7cfa 100%);
  color: #fff;
  padding: 20px 24px;
}

.method-tag {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 8px;
}

.method-card-header h3 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
}

.method-steps {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.method-step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.step-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-text);
}

.step-content p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.step-content code {
  background: #f1f3f9;
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.82rem;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* ===========================
   Two-column Layout
   =========================== */
.two-col-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: start;
  margin-top: 20px;
}

@media (max-width: 820px) {
  .two-col-layout {
    grid-template-columns: 1fr;
  }
}

/* ===========================
   Ablation Layout
   =========================== */
.abl-layout {
  margin-top: 20px;
}

.results-table-abl th {
  text-align: center;
  white-space: normal;
  min-width: 0;
}

.results-table-abl td {
  text-align: center;
}

.results-table-abl td:first-child {
  min-width: 0;
  white-space: normal;
}

@media (max-width: 820px) {
  .abl-layout {
    grid-template-columns: 1fr;
  }
}

.abl-table-block {}

.abl-fig-block {}

/* Legend */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 12px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.legend-dot {
  width: 13px;
  height: 13px;
  border-radius: 3px;
  flex-shrink: 0;
}

.oneshot-dot { background: var(--color-abl-oneshot); }
.iteronly-dot { background: var(--color-abl-iteronly); }
.ours-dot { background: var(--color-abl-ours); }

/* ===========================
   Badges
   =========================== */
.badge-teacher {
  display: inline-block;
  background: #ffe066;
  color: #7a5800;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 4px;
  margin-left: 5px;
}

.badge-ours {
  display: inline-block;
  background: var(--color-ours-border);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 4px;
  margin-left: 5px;
}

/* ===========================
   Footer
   =========================== */
.footer {
  background: #1a1a2e;
  color: rgba(255,255,255,0.65);
  padding: 36px 24px;
  text-align: center;
  font-size: 0.88rem;
  line-height: 1.7;
}

.footer p + p {
  margin-top: 6px;
}

.footer-contact a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
}

.footer-contact a:hover {
  color: #fff;
  text-decoration: underline;
}

/* ===========================
   Underline (from tables)
   =========================== */
u {
  text-decoration-thickness: 1.5px;
  text-underline-offset: 2px;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 600px) {
  .paper-title {
    font-size: 1.45rem;
  }

  .section {
    padding: 48px 0;
  }

  .highlight-boxes {
    gap: 12px;
  }

  .highlight-box {
    min-width: 140px;
    padding: 16px 20px;
  }

  .highlight-num {
    font-size: 1.6rem;
  }
}

/* ===========================
   TL;DR
   =========================== */
.tldr-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 680px;
  margin: 0 auto 24px;
}

.tldr-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
}

.tldr-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.tldr-result {
  text-align: center;
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-accent-light);
  border-radius: var(--radius);
  padding: 16px 28px;
  max-width: 680px;
  margin: 0 auto;
}

/* ===========================
   Conference Badge
   =========================== */
.conference-badge {
  display: inline-block;
  background: rgba(255,255,255,0.18);
  border: 1.5px solid rgba(255,255,255,0.55);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 20px;
  border-radius: 20px;
  margin-bottom: 22px;
}

/* ===========================
   Qualitative Results
   =========================== */
.qual-case {
  background: #fff;
  border-radius: var(--radius);
  border: 1.5px solid #e2e8f0;
  overflow: hidden;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
}

.qual-case-header {
  background: #f0f3fb;
  border-bottom: 1px solid #e2e8f0;
  padding: 14px 22px;
}

.case-num {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.case-task {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.qual-panel {
  padding: 18px 22px;
}

.qual-before {
  border-bottom: 1px solid #fecaca;
  background: #fff9f9;
}

.qual-after {
  border-bottom: 1px solid #bbf7d0;
  background: #f7fff9;
}

.qual-panel-header {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 14px;
}

.qual-before .qual-panel-header {
  background: #fee2e2;
  color: #991b1b;
}

.qual-after .qual-panel-header {
  background: #dcfce7;
  color: #166534;
}

.qual-screenshots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 10px;
}

@media (max-width: 640px) {
  .qual-screenshots {
    grid-template-columns: 1fr;
  }
}

.qual-screenshot-item img {
  width: 100%;
  border-radius: 6px;
  border: 1px solid #e0e4ee;
  display: block;
  cursor: zoom-in;
  transition: opacity 0.15s;
}

.qual-screenshot-item img:hover {
  opacity: 0.85;
}

/* ===========================
   Lightbox
   =========================== */
.lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
}

.lightbox-overlay.active {
  display: flex;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 8px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
  cursor: default;
}

.lightbox-close {
  position: fixed;
  top: 20px;
  right: 24px;
  color: #fff;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0.8;
  background: none;
  border: none;
  font-family: var(--font-sans);
  transition: opacity 0.15s;
}

.lightbox-close:hover {
  opacity: 1;
}

.step-label {
  font-size: 0.73rem;
  font-weight: 700;
  color: var(--color-accent);
  text-align: center;
  margin-top: 5px;
}

.step-caption {
  font-size: 0.73rem;
  color: var(--color-text-muted);
  margin-top: 3px;
  line-height: 1.4;
  text-align: center;
}

.qual-footnote {
  font-size: 1rem;
  font-style: italic;
  color: var(--color-text-muted);
  margin-top: 6px;
  line-height: 1.5;
}

.qual-analysis {
  background: #fffbe6;
  border-top: 1px solid #ffe066;
  padding: 14px 22px;
  font-size: 1rem;
  color: #3d3000;
  line-height: 1.65;
}

.qual-analysis strong {
  color: #7a5800;
}

/* ===========================
   BibTeX
   =========================== */
.bibtex-block {
  position: relative;
  background: #1e2030;
  border-radius: var(--radius);
  padding: 24px 28px;
  overflow-x: auto;
}

.bibtex-code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875rem;
  line-height: 1.7;
  color: #cdd6f4;
  white-space: pre;
  margin: 0;
}

.bibtex-copy {
  position: absolute;
  top: 14px;
  right: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.1);
  color: #cdd6f4;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 0.8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: background 0.15s;
}

.bibtex-copy:hover {
  background: rgba(255,255,255,0.2);
}