/* ==========================================================================
   FLASH Policy — project page styles
   --------------------------------------------------------------------------
   To re-skin the site, edit ONLY the CSS variables in :root below.
   ========================================================================== */

:root {
  /* ----- Brand color (matches the figure palette) ----- */
  --primary:        #4E8BC7;
  --primary-dark:   #2E6FAE;
  --primary-light:  #E8F0FA;

  /* ----- Neutrals ----- */
  --bg:             #ffffff;
  --text:           #1a1a1a;
  --text-muted:     #555555;
  --border:         #e3e3e3;
  --table-row-alt:  #fafafa;
  --code-bg:        #f6f8fa;

  /* ----- Typography ----- */
  --font-body:      'Noto Sans', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-serif:     'Source Serif Pro', Georgia, 'Times New Roman', serif;
  --font-mono:      'JetBrains Mono', 'SF Mono', Menlo, Monaco, Consolas, monospace;

  /* ----- Layout ----- */
  --max-width:      980px;
  --side-padding:   1.5rem;
  --section-gap:    3.5rem;
  --radius:         6px;
}

/* ==========================================================================
   Base
   ========================================================================== */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary-dark);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}
a:hover { border-bottom-color: var(--primary-dark); }

img { max-width: 100%; height: auto; display: block; }

em, i { font-style: italic; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--side-padding);
}

/* ==========================================================================
   Hero / title block
   ========================================================================== */
.hero {
  padding: 4rem var(--side-padding) 2rem;
  text-align: center;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.5rem;
  color: var(--text);
}

.hero__subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
  font-weight: 400;
}

/* Highlight the F-L-A-S-H acronym letters in the subtitle.
   Tune font-size (em = multiplier of surrounding text size) and color here. */
.flash-letter {
  font-weight: 700;
  font-size: 1.35em;
  color: var(--primary-dark);
  font-style: normal;        /* keep upright even inside <i> */
  letter-spacing: 0.01em;
}

/* ----- Authors ----- */
.authors {
  max-width: 800px;
  margin: 0 auto 0.75rem;
  font-size: 1.05rem;
  line-height: 2;
}

.authors__name {
  display: inline-block;
  margin: 0 0.4rem;
  white-space: nowrap;
}

.authors__mark {
  color: var(--primary);
  font-weight: 600;
}

.affiliation {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0.5rem 0 0.5rem;
}

.authors__note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0.25rem 0 2rem;
}

/* ----- Action buttons (Paper / Code / arXiv) ----- */
.cta-row {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  background: var(--text);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid var(--text);
  cursor: pointer;
  transition: background 0.15s, transform 0.15s;
}
.cta:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  border-bottom-color: var(--primary-dark);
  transform: translateY(-1px);
}
.cta--disabled {
  background: #d0d0d0;
  color: #ffffff;
  border-color: #d0d0d0;
  cursor: not-allowed;
  pointer-events: none;
  opacity: 0.85;
}
.cta__badge {
  font-size: 0.7rem;
  padding: 0.1rem 0.4rem;
  background: rgba(255,255,255,0.25);
  border-radius: 999px;
  margin-left: 0.25rem;
}

/* ==========================================================================
   Section blocks
   ========================================================================== */
section {
  padding: var(--section-gap) 0;
}

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

.section__title {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 700;
  margin: 0 0 1.25rem;
  text-align: center;
  color: var(--text);
}

.section__lead {
  font-size: 1.02rem;
  color: var(--text);
  line-height: 1.75;
  text-align: justify;
  hyphens: auto;
}

/* ----- Figures ----- */
figure {
  margin: 1.75rem 0 0.5rem;
  text-align: center;
}
figure img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: var(--radius);
}
figcaption {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 0.5rem;
  line-height: 1.55;
}
figcaption b { color: var(--text); }

/* ----- Bullet list of contributions ----- */
.contrib-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
}
.contrib-list li {
  position: relative;
  padding: 0.6rem 0 0.6rem 2rem;
  line-height: 1.65;
}
.contrib-list li::before {
  content: "";
  position: absolute;
  left: 0.4rem;
  top: 1rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
}

/* ==========================================================================
   Results table
   ========================================================================== */
.table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0 0.5rem;
}

table.results {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
table.results th,
table.results td {
  padding: 0.55rem 0.8rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
table.results th {
  background: var(--primary-light);
  color: var(--text);
  font-weight: 600;
  border-bottom: 2px solid var(--primary);
}
table.results td:first-child,
table.results th:first-child {
  text-align: left;
}
table.results tr:nth-child(even) td { background: var(--table-row-alt); }
table.results tr.ours td {
  font-weight: 700;
  background: var(--primary-light) !important;
  color: var(--primary-dark);
}
table.results .best   { font-weight: 700; color: var(--primary-dark); }
table.results .second { text-decoration: underline; }

/* ==========================================================================
   BibTeX
   ========================================================================== */
.bibtex pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--text);
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  padding: 2rem var(--side-padding) 3rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}
footer a { color: var(--text-muted); }
footer a:hover { color: var(--primary-dark); }

/* ==========================================================================
   Responsive tweaks
   ========================================================================== */
@media (max-width: 640px) {
  :root { --section-gap: 2.5rem; }
  .hero { padding-top: 2.5rem; }
  .section__lead { text-align: left; }
  .cta { padding: 0.5rem 0.9rem; font-size: 0.9rem; }
  table.results { font-size: 0.82rem; }
  table.results th,
  table.results td { padding: 0.45rem 0.5rem; }
}