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

html { scroll-behavior: smooth; }

body {
  background: #070A14;
  color: #E8EAF0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  font-feature-settings: 'cv02', 'cv03', 'cv04', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ─── Theme tokens ───────────────────────────────────────── */
:root {
  --bg:           #070A14;
  --bg-alt:       #0A0E1C;
  --surface:      #0F1421;
  --surface-2:    #151B2D;
  --surface-3:    #1B2238;
  --border:       rgba(255, 255, 255, 0.06);
  --border-hi:    rgba(255, 255, 255, 0.12);
  --border-cyan:  rgba(0, 212, 255, 0.25);
  --border-violet:rgba(168, 85, 247, 0.25);

  --text:         #E8EAF0;
  --text-2:       #A0A8BD;
  --text-3:       #6B7390;
  --text-4:       #4A5170;

  --cyan:         #00D4FF;
  --cyan-dim:     #0099CC;
  --violet:       #A855F7;
  --violet-dim:   #7E3FBF;
  --green:        #10B981;
  --amber:        #F59E0B;
  --red:          #EF4444;

  --mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
  --max-w: 1180px;
}

/* ─── Background grid + glow ─────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  background-position: -1px -1px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(ellipse at 50% 0%, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 0%, black 30%, transparent 80%);
}
.bg-glow {
  position: fixed;
  top: -300px;
  left: 50%;
  transform: translateX(-50%);
  width: 1200px;
  height: 800px;
  background: radial-gradient(
    ellipse at center,
    rgba(0, 212, 255, 0.12) 0%,
    rgba(168, 85, 247, 0.08) 35%,
    transparent 70%
  );
  filter: blur(40px);
  pointer-events: none;
  z-index: 0;
}

/* ─── Layout helpers ─────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; position: relative; z-index: 1; }
.section { padding: 6rem 0; position: relative; z-index: 1; }
.section-alt { background: linear-gradient(180deg, transparent 0%, rgba(15, 20, 33, 0.6) 50%, transparent 100%); }

/* ─── Nav ────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 10, 20, 0.7);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.logo-mark {
  color: var(--cyan);
  font-size: 1.1rem;
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.5));
}
.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--text); }
.nav-github {
  font-family: var(--mono);
  font-size: 0.8rem !important;
  color: var(--cyan) !important;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border-cyan);
  border-radius: 6px;
  transition: all 0.15s ease;
}
.nav-github:hover {
  background: rgba(0, 212, 255, 0.08);
  border-color: var(--cyan);
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
}

/* ─── Hero ───────────────────────────────────────────────── */
.hero {
  padding: 8rem 2rem 5rem;
  position: relative;
  z-index: 1;
}
.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}
.hero-meta { margin-bottom: 2rem; }
.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--text-2);
  padding: 0.45rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 100px;
  text-transform: uppercase;
}
.pill-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.5rem, 6.5vw, 5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin-bottom: 1.75rem;
  background: linear-gradient(180deg, #FFFFFF 0%, #B8BFD3 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-2);
  max-width: 680px;
  margin: 0 auto 2.75rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 0.85rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  transition: all 0.15s ease;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(135deg, var(--cyan) 0%, #2EE0FF 100%);
  color: #001520;
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.4), 0 4px 24px rgba(0, 212, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.5), 0 8px 32px rgba(0, 212, 255, 0.35);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-hi);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--text-3);
}
.arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}
.btn:hover .arrow { transform: translateX(3px); }

/* ─── Hero stats ──────────────────────────────────────────── */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  max-width: 980px;
  margin: 0 auto;
  padding: 1.75rem;
  background: linear-gradient(180deg, rgba(15, 20, 33, 0.8) 0%, rgba(10, 14, 28, 0.5) 100%);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}
.hstat {
  display: flex;
  flex-direction: column;
  text-align: left;
  padding: 0.5rem 1rem;
  border-left: 1px solid var(--border);
}
.hstat:first-child { border-left: none; }
.hstat-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.13em;
  color: var(--text-3);
  margin-bottom: 0.4rem;
}
.hstat-value {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}
.hstat-sub {
  font-size: 0.78rem;
  color: var(--text-3);
}

/* ─── Section headers ─────────────────────────────────────── */
.section-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.section-num {
  color: var(--cyan);
  font-weight: 600;
}
.section-kicker {
  color: var(--text-3);
  font-weight: 500;
}
.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 1.25rem;
  max-width: 820px;
  color: var(--text);
}
.section-intro {
  font-size: 1.05rem;
  color: var(--text-2);
  max-width: 760px;
  margin-bottom: 3rem;
  line-height: 1.7;
}

/* ─── Overview ────────────────────────────────────────────── */
.overview-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 4rem;
  align-items: start;
}
.overview-text p {
  color: var(--text-2);
  font-size: 1.02rem;
  line-height: 1.75;
  margin-bottom: 1.25rem;
}
.overview-text strong { color: var(--text); font-weight: 600; }

.overview-callouts {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--violet);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  transition: all 0.15s ease;
}
.callout:hover {
  border-left-color: var(--cyan);
  background: var(--surface-2);
}
.callout-tag {
  display: block;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--violet);
  margin-bottom: 0.4rem;
  font-weight: 600;
}
.callout p { font-size: 0.92rem; color: var(--text-2); line-height: 1.55; }

/* ─── Architecture figure ─────────────────────────────────── */
.arch-fig { margin-top: 2rem; }
.arch-frame {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border-hi);
  box-shadow: 0 0 0 1px var(--border-hi), 0 20px 80px rgba(0,0,0,0.5), 0 0 60px rgba(0, 212, 255, 0.05);
}
.arch-frame img { width: 100%; display: block; border-radius: 4px; }
.arch-fig figcaption {
  margin-top: 1.25rem;
  font-size: 0.88rem;
  color: var(--text-2);
  text-align: center;
  line-height: 1.7;
}
.arch-fig figcaption code {
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--surface);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  color: var(--cyan);
}
.legend-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  margin-right: 0.4rem;
  vertical-align: middle;
}
.legend-amber { background: #D97706; box-shadow: 0 0 8px #D97706; }
.legend-violet { background: var(--violet); box-shadow: 0 0 8px var(--violet); }

/* ─── Studies ─────────────────────────────────────────────── */
.study {
  margin-top: 4rem;
  padding-top: 4rem;
  border-top: 1px solid var(--border);
}
.study:first-of-type { border-top: none; padding-top: 0; }

.study-header { margin-bottom: 2.5rem; }
.study-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  font-weight: 600;
  margin-bottom: 0.85rem;
  padding: 0.3rem 0.7rem;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid var(--border-cyan);
  border-radius: 4px;
}
.study-header h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.2;
  margin-bottom: 0.85rem;
  color: var(--text);
}
.study-lede {
  color: var(--text-2);
  font-size: 1.02rem;
  line-height: 1.7;
  max-width: 780px;
}

.study-body {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 3rem;
  align-items: start;
}
.study-body-stack { display: block; }

/* ─── Big stats ───────────────────────────────────────────── */
.study-stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.big-stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem 1.75rem;
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
}
.big-stat::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  opacity: 0.4;
}
.big-stat:hover {
  border-color: var(--border-cyan);
  background: var(--surface-2);
  transform: translateY(-2px);
}
.big-stat:hover::before { opacity: 1; }
.big-stat-num {
  font-family: var(--mono);
  font-size: 2.4rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1;
  display: inline-block;
}
.big-stat-unit {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--cyan);
  margin-left: 0.5rem;
  font-weight: 500;
}
.big-stat-label {
  display: block;
  font-size: 0.92rem;
  color: var(--text-2);
  margin-top: 0.7rem;
  line-height: 1.55;
}

/* ─── Study figure ────────────────────────────────────────── */
.study-fig figcaption {
  margin-top: 0.75rem;
  font-size: 0.83rem;
  color: var(--text-3);
  text-align: center;
  line-height: 1.5;
}
.fig-frame {
  background: white;
  border-radius: 10px;
  padding: 1rem;
  border: 1px solid var(--border-hi);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.fig-frame img { width: 100%; display: block; border-radius: 4px; }

.study-figs-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
}

/* ─── Ablation comparison ─────────────────────────────────── */
.ablation-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: stretch;
  margin-bottom: 2.5rem;
}
.ablation-col { display: flex; }
.versus {
  display: flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--text-3);
  font-weight: 500;
}
.comp-card {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
  transition: all 0.2s ease;
}
.comp-bad { border-color: rgba(239, 68, 68, 0.2); }
.comp-good {
  border-color: var(--border-cyan);
  background: linear-gradient(180deg, rgba(0, 212, 255, 0.04) 0%, var(--surface) 100%);
}
.comp-head {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}
.comp-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  font-weight: 600;
}
.comp-bad .comp-label { color: var(--red); }
.comp-good .comp-label { color: var(--cyan); }
.comp-set {
  font-family: var(--mono);
  font-size: 0.92rem;
  color: var(--text);
  font-weight: 500;
}
.comp-num {
  font-family: var(--mono);
  font-size: 3.5rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 1rem;
}
.comp-pct {
  font-size: 1.5rem;
  color: var(--text-3);
  font-weight: 500;
  margin-left: 0.15rem;
}
.comp-bar {
  height: 6px;
  background: rgba(255,255,255,0.04);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.85rem;
}
.comp-bar-fill {
  height: 100%;
  background: var(--red);
  border-radius: 3px;
}
.comp-bar-good {
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.4);
}
.comp-foot {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-3);
}

/* ─── LOO callout & age callout ───────────────────────────── */
.loo-callout, .age-callout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  align-items: center;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.08) 0%, rgba(0, 212, 255, 0.05) 100%);
  border: 1px solid var(--border-violet);
  border-radius: 14px;
  padding: 2rem 2.5rem;
  margin-bottom: 2rem;
}
.loo-num, .age-num {
  font-family: var(--mono);
  font-size: 4rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--violet) 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.04em;
  line-height: 1;
}
.loo-pct, .age-pct {
  font-size: 2rem;
  font-weight: 500;
}
.loo-text, .age-text {
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.65;
}
.loo-text strong, .age-text strong { color: var(--text); font-weight: 600; }

/* ─── Domain grid ─────────────────────────────────────────── */
.domain-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.domain-col {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.2s ease;
}
.domain-col:hover { border-color: var(--border-hi); background: var(--surface-2); }
.domain-col-req {
  border-color: rgba(239, 68, 68, 0.25);
  background: linear-gradient(180deg, rgba(239, 68, 68, 0.05) 0%, var(--surface) 100%);
}
.dcol-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.dcol-desc {
  font-size: 0.85rem;
  color: var(--text-3);
  margin-bottom: 1rem;
  line-height: 1.5;
}
.dcol-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.dcol-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--text);
}
.dcol-num {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--cyan);
  font-weight: 500;
}

/* ─── Tags ────────────────────────────────────────────────── */
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tag-not { background: rgba(16, 185, 129, 0.12); color: var(--green); border: 1px solid rgba(16, 185, 129, 0.25); }
.tag-opt { background: rgba(245, 158, 11, 0.12); color: var(--amber); border: 1px solid rgba(245, 158, 11, 0.25); }
.tag-req { background: rgba(239, 68, 68, 0.12); color: var(--red); border: 1px solid rgba(239, 68, 68, 0.25); }

/* ─── Pipeline (framework) ────────────────────────────────── */
.pipeline {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 1rem;
  align-items: stretch;
  margin-top: 1rem;
}
.pipe-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem 1.5rem;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.pipe-step::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.pipe-step:hover {
  border-color: var(--border-cyan);
  background: var(--surface-2);
  transform: translateY(-2px);
}
.pipe-step:hover::before { transform: scaleX(1); }

.pipe-step-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.pipe-num {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--cyan);
  font-weight: 600;
}
.pipe-icon {
  font-size: 1.3rem;
  color: var(--violet);
  filter: drop-shadow(0 0 8px rgba(168, 85, 247, 0.5));
}
.pipe-step h3 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 0.65rem;
  color: var(--text);
  line-height: 1.3;
}
.pipe-step p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}
.pipe-tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-3);
  letter-spacing: 0.05em;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--border);
}
.pipe-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-3);
  font-family: var(--mono);
  font-weight: 300;
}

/* ─── Paper card ──────────────────────────────────────────── */
.paper-card {
  background: linear-gradient(135deg, rgba(15, 20, 33, 0.9) 0%, rgba(10, 14, 28, 0.9) 100%);
  border: 1px solid var(--border-hi);
  border-radius: 16px;
  padding: 2px;
  position: relative;
  overflow: hidden;
}
.paper-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 16px;
  padding: 1px;
  background: linear-gradient(135deg, var(--cyan), var(--violet), transparent);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.35;
  pointer-events: none;
}
.paper-card-inner { padding: 2.75rem; }
.paper-meta { margin-bottom: 1.5rem; }
.paper-pill { background: rgba(0, 212, 255, 0.06) !important; border-color: var(--border-cyan) !important; color: var(--cyan) !important; }
.paper-title {
  font-size: clamp(1.4rem, 2.6vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  max-width: 800px;
}
.paper-abs {
  font-size: 1rem;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 720px;
  margin-bottom: 1.25rem;
}
.paper-authors-line {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-3);
  margin-bottom: 1.75rem;
}
.paper-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* ─── Footer ──────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2rem;
  margin-top: 4rem;
  position: relative;
  z-index: 1;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer-left, .footer-right {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--text-3);
}
.footer-left .logo-text { color: var(--text-2); font-weight: 600; }

/* ─── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .nav-links { gap: 1.25rem; }
  .nav-links a:not(.nav-github) { display: none; }
  .hero { padding: 5rem 1.5rem 4rem; }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 0; }
  .hstat { border-left: none; border-top: 1px solid var(--border); padding: 1rem; }
  .hstat:first-child, .hstat:nth-child(2) { border-top: none; }
  .hstat:nth-child(odd) { border-right: 1px solid var(--border); }

  .overview-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .study-body { grid-template-columns: 1fr; gap: 2rem; }
  .ablation-row { grid-template-columns: 1fr; }
  .versus { justify-content: center; padding: 0.5rem 0; }
  .study-figs-row { grid-template-columns: 1fr; }
  .domain-grid { grid-template-columns: 1fr; }

  .pipeline { grid-template-columns: 1fr; }
  .pipe-arrow { transform: rotate(90deg); padding: 0.25rem 0; }

  .loo-callout, .age-callout { grid-template-columns: 1fr; gap: 1rem; padding: 1.5rem; text-align: left; }
  .loo-num, .age-num { font-size: 3rem; }

  .paper-card-inner { padding: 1.75rem; }
  .footer-inner { flex-direction: column; gap: 1rem; }
}