:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-raised: #eef0f4;
  --border: #d0d5de;
  --border-subtle: #dfe3ea;
  --text: #1a1d24;
  --text-secondary: #4a5062;
  --text-dim: #7c8495;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --accent-glow: rgba(37, 99, 235, 0.06);
  --teal: #0d9488;
  --teal-soft: rgba(13, 148, 136, 0.08);
  --orange: #d97706;
  --orange-soft: rgba(217, 119, 6, 0.08);
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", monospace;
  --content-width: 1080px;
  --gutter: 24px;
}

/* ===== Reset ===== */

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

/* ===== Base ===== */

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.55;
}

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

/* ===== Layout ===== */

.page-shell {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--gutter) 40px;
}

/* ===== Header — full bleed ===== */

.header {
  background: linear-gradient(180deg, #dfe2e9 0%, #e8eaef 60%, var(--bg) 100%);
  border-bottom: 1px solid var(--border);
  padding: 48px 0 40px;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 0%, rgba(59, 130, 246, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 80% 0%, rgba(45, 212, 191, 0.03) 0%, transparent 70%);
  pointer-events: none;
}

.header-inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.title-row {
  display: flex;
  align-items: center;
  gap: 28px;
}

.venue-badge {
  display: inline-block;
  margin-bottom: 16px;
  padding: 5px 12px;
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.title {
  flex: 1;
  color: #111318;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3.2vw, 2.8rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.title-accent {
  background: linear-gradient(90deg, var(--accent), var(--teal));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.authors-row {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 8px 36px;
  margin-top: 20px;
}

.author-primary .name {
  display: block;
  color: #111318;
  font-size: 1.05rem;
  font-weight: 600;
}

.author-primary .name-link {
  color: inherit;
  text-decoration: none;
}

.author-primary .star {
  margin-left: 2px;
  color: var(--orange);
  font-size: 0.7rem;
  vertical-align: super;
}

.author-primary .affil,
.author-primary .email,
.author-minor .affil {
  display: block;
  margin-top: 2px;
  font-size: 0.88rem;
}

.author-primary .affil,
.author-minor {
  color: var(--text-secondary);
}

.author-primary .email {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.82rem;
  text-decoration: none;
}

.authors-secondary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  padding-top: 2px;
}

.author-minor {
  font-size: 0.95rem;
  font-weight: 400;
}

.author-minor .affil {
  color: var(--text-dim);
  font-size: 0.82rem;
}

.logo-box {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
}

.logo-image {
  height: 56px;
  width: auto;
}

/* ===== Content ===== */

.page-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 28px 0;
}

/* ===== Cards ===== */

.card {
  padding: 32px 36px;
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.03);
  text-align: justify;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.card:hover {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07), 0 8px 24px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}

.card-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.card-label .num {
  padding: 3px 7px;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 500;
}

.card h2 {
  margin: 0 0 16px;
  color: #111318;
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.2vw, 2rem);
  font-weight: 600;
  line-height: 1.22;
  text-align: left;
}

.card h3 {
  margin: 20px 0 8px;
  color: var(--text);
  font-size: 1.02rem;
  font-weight: 600;
  text-align: left;
}

.card p,
.card li {
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.65;
}

.card p + p {
  margin-top: 12px;
}

.card strong {
  color: var(--text);
}

/* ===== Key-point callouts ===== */

.key-point {
  margin: 20px 0 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  border-radius: 0 6px 6px 0;
  background: var(--accent-glow);
}

.key-point.teal {
  border-left-color: var(--teal);
  background: var(--teal-soft);
}

.key-point.orange {
  border-left-color: var(--orange);
  background: var(--orange-soft);
}

.key-point p {
  color: var(--text);
}

/* ===== Figures ===== */

.figure {
  margin: 20px 0;
  padding: 24px;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  background: var(--surface-raised);
  text-align: center;
}

.figure img {
  width: 100%;
}

.figure-narrow {
  max-width: 720px;
  margin: 0 auto;
}

.eq {
  padding: 12px 0;
  text-align: center;
}

.eq img {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
}

.figure-caption,
.table-note {
  margin-top: 14px;
  color: var(--text-dim);
  font-size: 0.9rem;
  font-style: italic;
  line-height: 1.45;
  text-align: justify;
}

/* ===== Sub-separators ===== */

.sub-sep {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 10px;
}

.sub-sep::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-subtle);
}

.sub-sep span {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ===== Code ===== */

.code-diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 18px;
}

.code-block {
  position: relative;
  padding: 20px 24px;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  background: #f0f2f5;
  overflow-x: auto;
}

.lang-tag {
  position: absolute;
  top: 10px;
  right: 14px;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.code-block--citation .lang-tag {
  right: 82px;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 14px;
  width: 64px;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-align: center;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.copy-btn:hover {
  background: var(--surface-raised);
  color: var(--text);
}

.code-block pre {
  color: #2d333b;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  white-space: pre;
}

.code-block .kw { color: #cf222e; }
.code-block .fn { color: #8250df; }
.code-block .var { color: #0550ae; }

.code-block .diff-add {
  background: rgba(13, 148, 136, 0.12);
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

/* ===== Table ===== */

.results-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

.results-table th {
  padding: 10px 12px;
  border-bottom: 2px solid var(--border);
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-align: left;
  text-transform: uppercase;
}

.results-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--mono);
  font-size: 0.84rem;
  transition: background 0.15s;
}

.results-table tbody tr:hover td {
  background: var(--surface-raised);
}

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

.results-table .best {
  color: var(--teal);
  font-weight: 600;
}

.results-table .sym {
  font-size: 1.2rem;
  line-height: 1;
}

/* ===== Contributions ===== */

.contrib {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.contrib-num {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.contrib:hover .contrib-num {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ===== Stats ===== */

.stats-row {
  display: grid;
  gap: 16px;
  margin-top: 12px;
}

.stats-row-three {
  grid-template-columns: repeat(3, 1fr);
}

.stat-box {
  padding: 20px 16px;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  background: var(--surface-raised);
  text-align: center;
  transition: background 0.15s, box-shadow 0.15s;
}

.stat-box:hover {
  background: var(--border-subtle);
}

.inline-stat {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  text-align: center;
}

.inline-stat-val {
  display: block;
  margin: 6px 0;
  color: var(--teal);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
}

.lbl {
  display: block;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-dim);
  font-size: 0.82rem;
  font-style: italic;
  line-height: 1.35;
  text-align: center;
}

/* ===== Footer — full bleed ===== */

.footer {
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, var(--bg) 0%, #e8eaef 100%);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 18px var(--gutter) 12px;
}

.footer-logo-box {
  display: flex;
  align-items: center;
}

.footer-logo {
  width: auto;
  height: 28px;
}

/* ===== Responsive — tablet landscape ===== */

@media (max-width: 1024px) {
  :root {
    --gutter: 20px;
  }

  .card {
    padding: 28px 28px;
  }
}

/* ===== Responsive — tablet portrait ===== */

@media (max-width: 820px) {
  .header {
    padding: 36px 0 32px;
  }

  .logo-image {
    height: 44px;
  }

  .code-diff {
    grid-template-columns: 1fr;
  }

  .stats-row-three {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* ===== Responsive — large phone ===== */

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
  }

  .header {
    padding: 28px 0 24px;
  }

  .venue-badge {
    font-size: 0.72rem;
    padding: 4px 10px;
  }

  .title {
    font-size: clamp(1.5rem, 6vw, 1.8rem);
  }

  .authors-row {
    flex-direction: column;
    gap: 12px;
  }

  .authors-secondary {
    flex-direction: column;
    gap: 10px;
  }

  .logo-image {
    height: 36px;
  }

  .card {
    padding: 22px 18px;
  }

  .card h2 {
    font-size: 1.35rem;
  }

  .stats-row-three {
    grid-template-columns: 1fr;
  }

  .results-table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ===== Responsive — small phone ===== */

@media (max-width: 400px) {
  .card {
    padding: 18px 14px;
  }

  .card h2 {
    font-size: 1.2rem;
  }

  .code-block {
    padding: 14px 12px;
  }

  .code-block pre {
    font-size: 0.72rem;
  }
}