/* ==========================================================================
   TrackCraft3R Project Page
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --accent: #d97706;          /* warm amber, evokes "craft" */
  --accent-soft: #fef3c7;
  --accent-deep: #b45309;
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --rule: #e5e5e5;
  --bg: #fafaf7;
  --card: #ffffff;
  --shadow: 0 1px 3px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', 'Avenir Next', 'Helvetica Neue', system-ui, sans-serif;
  font-weight: 300;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Layout cards (st4rtrack-inspired) --- */
.content {
  max-width: 1000px;
  padding: 32px 56px;
  margin: 28px auto;
  background: var(--card);
  box-shadow: var(--shadow);
  border-radius: 16px;
}
@media (max-width: 1080px) {
  .content { margin: 16px; padding: 24px 28px; max-width: none; }
}

.content h2 {
  font-size: 28px;
  font-weight: 500;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.content h3 {
  font-size: 20px;
  font-weight: 500;
  margin: 24px 0 8px;
  color: var(--ink);
}
.content p { margin: 10px 0; text-align: left; color: var(--ink-soft); }
.content p strong, .content p em { color: var(--ink); }

/* --- Hero --- */
.hero {
  text-align: center;
  padding: 44px 56px 28px;
}
.hero h1 {
  font-size: 40px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 6px;
}
.hero h1 .ours {
  background: linear-gradient(90deg, #F59E0B 0%, #EF4444 100%);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
          color: transparent;
  font-weight: 700;
}
.hero .subtitle {
  font-size: 22px;
  font-weight: 400;
  color: var(--ink-soft);
  margin: 4px 0 22px;
}
.venue {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-deep);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}

/* --- Authors --- */
.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px 6px;
  font-size: clamp(13px, 1.5vw, 16px);
  margin: 8px 0 4px;
}
.authors span { display: inline; }
.authors sup { font-size: 12px; }
.authors a { color: var(--ink); border-bottom: 1px dotted #aaa; }
.authors a:hover { color: var(--accent-deep); border-bottom-color: var(--accent-deep); text-decoration: none; }
.affiliations {
  text-align: center !important;
  font-size: 16px;
  color: var(--ink-soft);
  margin-top: 6px;
}
.affiliations span { margin: 0 10px; }

/* --- Action buttons (paper / arxiv / code / bibtex) --- */
.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 26px 0 4px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  background: #1f1f1f;
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid #1f1f1f;
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; transform: translateY(-1px); text-decoration: none; }
.btn .ico {
  width: 16px; height: 16px;
  display: inline-block;
  vertical-align: middle;
}

/* --- Teaser --- */
.teaser-wrap {
  padding: 0 32px 28px;
}
.teaser-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 12px;
  background:
    repeating-linear-gradient(135deg, #f4f4f0, #f4f4f0 12px, #ebeae5 12px, #ebeae5 24px);
  border: 1px dashed #d4d4d4;
  display: grid;
  place-items: center;
  color: #9a9a9a;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  letter-spacing: 0.05em;
}
.teaser-caption {
  text-align: center;
  font-size: 15.5px;
  color: var(--ink-soft);
  margin-top: 14px;
}
.teaser-caption strong { color: var(--ink); }

/* --- Click-to-play gallery --- */
.gallery { display: block; }

.player {
  position: relative;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 16/9;
  background: #0a0a0a;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.10);
  margin-bottom: 16px;
}
.player video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #0a0a0a;
}
.player .overlay-info {
  position: absolute;
  bottom: 14px; left: 14px;
  padding: 6px 12px;
  border-radius: 6px;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(6px);
  color: #fff;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  z-index: 2;
}
.player .loader {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 12px;
  letter-spacing: 0.1em;
  font-family: 'JetBrains Mono', monospace;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.player.loading .loader { opacity: 0.85; }
.player.loading video { opacity: 0.25; }

.thumbs {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 8px;
}
@media (max-width: 980px) { .thumbs { grid-template-columns: repeat(5, 1fr); } }
@media (max-width: 600px) { .thumbs { grid-template-columns: repeat(3, 1fr); } }
.thumb {
  position: relative;
  border: 0;
  padding: 0;
  background: #000;
  aspect-ratio: 16/10;
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  outline: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.2s;
}
.thumb .label {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 12px 6px 5px;
  font-size: 10.5px;
  color: #fff;
  font-weight: 500;
  text-align: center;
  line-height: 1.25;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, rgba(0,0,0,0) 100%);
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}
.thumb:hover { transform: translateY(-2px); }
.thumb:hover img { opacity: 0.85; }
.thumb.active {
  box-shadow: 0 0 0 3px var(--accent);
}
.thumb.active::after {
  content: "▶";
  position: absolute;
  top: 6px; right: 8px;
  color: var(--accent);
  font-size: 11px;
  background: rgba(255,255,255,0.95);
  width: 20px; height: 20px;
  display: grid; place-items: center;
  border-radius: 999px;
}

/* --- Method figures --- */
figure {
  margin: 8px 0;
  text-align: center;
}
figure img { max-width: 100%; height: auto; border-radius: 6px; }
figcaption {
  margin-top: 8px;
  font-size: 14.5px;
  color: var(--ink-soft);
  text-align: center;
  line-height: 1.55;
}
figcaption strong { color: var(--ink); }

.fig-pointmap { max-width: 540px; margin: 14px auto; }
.fig-architecture { max-width: 100%; margin: 0; }

/* Pointmap section: figure floats right (must come first in the DOM)
   so the intro paragraph + cards + goal paragraph wrap around it,
   and extend full-width below the figure once it ends. */
.pointmap-section {
  display: block;
  margin-top: 6px;
}
.pointmap-section::after {
  content: "";
  display: block;
  clear: both;
}
.pointmap-section > p:first-of-type { margin-top: 0; }
.pointmap-section .pointmap-fig {
  float: right;
  width: 42%;
  max-width: 400px;
  margin: 0 0 14px 4px;
}
.pointmap-section .pointmap-fig img {
  width: 100%;
  max-width: 100%;
  display: block;
}
.pointmap-cards {
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 10px;
  margin: 12px 0 0;
}
.pointmap-cards .idea { padding: 14px 16px; }
.pointmap-cards .idea h4 { font-size: 14.5px; }
.pointmap-cards .idea p { font-size: 14.5px; line-height: 1.55; }
@media (max-width: 800px) {
  .pointmap-section .pointmap-fig {
    float: none;
    width: 100%;
    max-width: 320px;
    margin: 0 auto 14px;
  }
}

/* --- Method "key idea" cards --- */
.idea-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 18px 0 4px;
}
@media (max-width: 760px) { .idea-grid { grid-template-columns: 1fr; } }
.idea {
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 18px 20px;
  background: #fdfcf9;
}
.idea h4 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent-deep);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.02em;
}
.idea p { margin: 4px 0; font-size: 15px; color: var(--ink-soft); }

/* --- Attention vis grid --- */
.attn-block { margin: 14px 0; }
.attn-row {
  display: grid;
  grid-template-columns: 36px repeat(4, 1fr);
  gap: 4px;
  align-items: center;
}
.attn-row .row-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--ink-soft);
  text-align: center;
}
.attn-cell { text-align: center; }
.attn-cell img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid var(--rule);
}
.attn-cell .cap {
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-top: 4px;
  font-family: 'JetBrains Mono', monospace;
}

/* --- Tables --- */
.table-scroll {
  width: 100%;
  overflow-x: auto;
  margin: 8px 0 4px;
}
table.results {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}
table.results th, table.results td {
  padding: 8px 10px;
  text-align: center;
  border-bottom: 1px solid var(--rule);
}
table.results th {
  font-weight: 600;
  font-size: 12.5px;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: #fafaf7;
}
table.results th.method, table.results td.method {
  text-align: left;
  font-weight: 500;
  white-space: nowrap;
}
table.results tr.group-head td {
  text-align: left;
  font-style: italic;
  color: var(--accent-deep);
  font-size: 13px;
  background: #fdfcf9;
  padding: 6px 10px;
}
table.results td.best { background: rgba(217,119,6,0.18); font-weight: 600; }
table.results td.second { background: rgba(217,119,6,0.07); }
table.results tr.ours { background: transparent; }
table.results tr.ours td.method { color: var(--accent-deep); font-weight: 700; }

/* --- Robustness 4-plot grid --- */
.robust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 12px 0 6px;
}
@media (max-width: 800px) { .robust-grid { grid-template-columns: repeat(2, 1fr); } }
.robust-grid figure { margin: 0; }
.robust-grid img { width: 100%; border-radius: 4px; }
.robust-grid figcaption { font-size: 13px; }
.legend {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  margin: 6px 0 8px;
  font-size: 13.5px;
  color: var(--ink-soft);
}
.legend .dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; vertical-align: middle; margin-right: 5px; }
.legend .ours-dot { background: #d62728; }
.legend .delta-dot { background: #1f77b4; }

/* --- Efficiency table compact --- */
.eff-table {
  max-width: 540px;
  margin: 10px auto 0;
}

/* --- Limitations --- */
.limitations ul { padding-left: 22px; line-height: 1.7; color: var(--ink-soft); }
.limitations li { margin-bottom: 8px; }
.limitations li strong { color: var(--ink); }

/* --- BibTeX --- */
.bibtex pre {
  background: #1a1a1a;
  color: #f0e7d4;
  padding: 18px 22px;
  border-radius: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
  margin: 4px 0;
}

/* --- Footer --- */
.footer {
  text-align: center;
  font-size: 13px;
  color: #888;
  padding: 24px 16px 40px;
}

/* --- Misc --- */
.kbd {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.92em;
  padding: 1px 6px;
  border-radius: 4px;
  background: #f1efe9;
  border: 1px solid #e2dfd6;
  color: var(--ink);
}
.gain {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent-deep);
  padding: 1px 8px;
  border-radius: 6px;
  font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.92em;
}

/* In-text highlighter for key concepts: amber marker under the word(s) */
.hl {
  background: linear-gradient(90deg, rgba(245,158,11,0.28), rgba(239,68,68,0.22));
  padding: 0 4px;
  border-radius: 3px;
  font-weight: 600;
  color: var(--ink);
}
.hl-grad {
  background: linear-gradient(90deg, #F59E0B 0%, #EF4444 100%);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
          color: transparent;
  font-weight: 700;
}

/* ==========================================================================
   Mobile responsiveness (≤ 768 px tablets, ≤ 480 px phones)
   ========================================================================== */

/* Prevent horizontal scroll from any overflowing child */
body { overflow-x: hidden; }

@media (max-width: 768px) {
  /* Hero */
  .hero { padding: 28px 20px 20px; }
  .hero h1 { font-size: 26px; }

  /* Authors: allow wrapping */
  .authors { white-space: normal; line-height: 1.9; font-size: 14px; }
  .affiliations { font-size: 14px; }

  /* Content cards */
  .content { padding: 20px 18px; margin: 12px 10px; }

  /* Table: touch scroll on iOS */
  .table-scroll { -webkit-overflow-scrolling: touch; }
}

@media (max-width: 480px) {
  /* Hero */
  .hero { padding: 22px 14px 16px; }
  .hero h1 { font-size: 20px; letter-spacing: -0.01em; line-height: 1.25; }
  .hero .subtitle { font-size: 15px; }
  .venue { font-size: 11px; }

  /* Authors */
  .authors { font-size: 13px; }
  .affiliations { font-size: 13px; }
  .affiliations span { display: inline-block; margin: 1px 6px; }

  /* Buttons */
  .btn { font-size: 13px; padding: 7px 14px; }

  /* Content */
  .content { padding: 16px 14px; margin: 8px 6px; border-radius: 10px; }
  .content h2 { font-size: 20px; }
  .content h3 { font-size: 16px; }
  .content p { font-size: 15px; }

  /* Table */
  table.results { font-size: 11px; }
  table.results th, table.results td { padding: 5px 5px; }
  table.results td.method { white-space: nowrap; }

  /* Robust grid → 2 columns on phones */
  .robust-grid { grid-template-columns: repeat(2, 1fr) !important; }

  /* Idea grid already 1-col at 760px, but font */
  .idea h4 { font-size: 15px; }

  /* Efficiency table full width */
  .eff-table { max-width: 100%; }

  /* BibTeX */
  .bibtex pre { font-size: 11px; padding: 12px 14px; }
}