/* ===== Scalable Normalizing Flows — dark portal theme ===== */
:root {
  --bg: #07080c;
  --bg-2: #0d0f17;
  --surface: #12141f;
  --surface-2: #171a28;
  --border: #232739;
  --border-2: #2e3450;
  --text: #eef1f8;
  --text-dim: #9aa3bd;
  --text-faint: #69708a;
  --accent: #e0314f;
  --accent-2: #f59e0b;
  --accent-glow: rgba(224,49,79, 0.35);
  --grad: linear-gradient(120deg, #e0314f 0%, #f59e0b 55%, #fbbf24 100%);
  --maxw: 1180px;
  --radius: 16px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}

/* ===== light mode ===== */
:root[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-2: #eef1f8;
  --surface: #ffffff;
  --surface-2: #f1f4fa;
  --border: #e2e6f0;
  --border-2: #cfd6e6;
  --text: #141824;
  --text-dim: #515b73;
  --text-faint: #8a93a8;
  --accent: #c81e3c;
  --accent-2: #d97706;
  --accent-glow: rgba(200, 30, 60, 0.22);
  --grad: linear-gradient(120deg, #c81e3c 0%, #d97706 55%, #f59e0b 100%);
  --shadow: 0 10px 36px rgba(20, 30, 60, 0.14);
}
/* surfaces that hardcode the dark base get a light counterpart */
:root[data-theme="light"] .nav { background: rgba(255, 255, 255, 0.72); }
:root[data-theme="light"] body::before {
  background:
    linear-gradient(to right, rgba(20,30,60,0.035) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(to bottom, rgba(20,30,60,0.035) 1px, transparent 1px) 0 0 / 64px 64px;
}
:root[data-theme="light"] body::after {
  background: radial-gradient(120% 80% at 50% 120%, rgba(200,30,60,0.04), transparent 60%);
}
:root[data-theme="light"] .btn-primary { color: #fff; }
:root[data-theme="light"] .contrib-num { color: #fff; }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

img, video { max-width: 100%; display: block; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.gradient-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ===== top nav ===== */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 8, 12, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.nav-brand { font-weight: 700; letter-spacing: -0.02em; font-size: 1.02rem; }
.nav-brand .dot { color: var(--accent); }
.nav-right { display: flex; align-items: center; gap: 22px; }
.nav-links { display: flex; gap: 26px; font-size: 0.9rem; }
.nav-links a { color: var(--text-dim); transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

/* theme toggle */
.theme-toggle {
  position: relative; width: 34px; height: 34px; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-2); border-radius: 50%;
  background: var(--surface); color: var(--text-dim); cursor: pointer;
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--accent); transform: translateY(-1px); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .ic-sun, .theme-toggle .ic-moon {
  position: absolute; display: inline-flex; transition: opacity 0.2s, transform 0.3s;
}
/* dark mode (default): show the sun (click → go light) */
.theme-toggle .ic-moon { opacity: 0; transform: rotate(-90deg) scale(0.6); }
.theme-toggle .ic-sun  { opacity: 1; transform: none; }
/* light mode: show the moon (click → go dark) */
:root[data-theme="light"] .theme-toggle .ic-sun  { opacity: 0; transform: rotate(90deg) scale(0.6); }
:root[data-theme="light"] .theme-toggle .ic-moon { opacity: 1; transform: none; }

/* ===== hero ===== */
.hero {
  position: relative;
  padding: 130px 0 90px;
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: -40% 0 auto 0; height: 760px;
  background:
    radial-gradient(60% 50% at 50% 0%, rgba(224,49,79, 0.18), transparent 70%),
    radial-gradient(40% 40% at 75% 15%, rgba(245,158,11, 0.16), transparent 70%),
    radial-gradient(40% 40% at 22% 18%, rgba(251,191,36, 0.10), transparent 70%);
  filter: blur(8px);
  z-index: 0;
}
.hero .wrap { position: relative; z-index: 1; }
.hero .eyebrow {
  display: inline-block;
  font-size: 0.78rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent); font-weight: 600;
  padding: 7px 16px; border: 1px solid var(--border-2); border-radius: 999px;
  background: rgba(224,49,79, 0.06);
  margin-bottom: 26px;
}
.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 1.04; letter-spacing: -0.035em; font-weight: 800;
  margin: 0 0 18px;
}
.hero .tagline {
  font-size: clamp(1.05rem, 2.2vw, 1.4rem);
  color: var(--text); font-weight: 500; margin: 0 auto 22px; max-width: 760px;
}
.hero .subtitle {
  font-size: 1.02rem; color: var(--text-dim);
  max-width: 680px; margin: 0 auto 36px;
}
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ===== buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px;
  font-size: 0.9rem; font-weight: 600;
  border: 1px solid var(--border-2);
  background: var(--surface-2); color: var(--text);
  transition: transform 0.15s, border-color 0.2s, background 0.2s;
}
.btn:hover { transform: translateY(-2px); border-color: var(--accent); }
.btn-primary { background: var(--grad); color: #0a0a12; border: none; }
.btn-primary:hover { box-shadow: 0 8px 30px var(--accent-glow); }
.btn svg { width: 16px; height: 16px; }

/* ===== section ===== */
section { padding: 70px 0; position: relative; }
.section-head { margin-bottom: 40px; }
.section-head .kicker {
  font-size: 0.78rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); font-weight: 600; margin-bottom: 10px;
}
.section-head h2 {
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  letter-spacing: -0.03em; font-weight: 800; margin: 0 0 10px;
}
.section-head p { color: var(--text-dim); max-width: 620px; margin: 0; }
.section-alt { background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 50%, var(--bg) 100%); }

/* ===== featured: Cambrian-style bento mosaic ===== */
.bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 200px;
  grid-auto-flow: dense;
  gap: 16px;
}
.tile {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface-2);
  transition: transform 0.22s, border-color 0.22s, box-shadow 0.22s;
}
.tile:hover { transform: translateY(-4px); border-color: var(--border-2); box-shadow: var(--shadow); }
.tile .media { position: absolute; inset: 0; }
.tile .media img, .tile .media video {
  width: 100%; height: 100%; object-fit: cover;
  filter: saturate(1.14) contrast(1.05);
  transition: transform 0.6s ease, filter 0.3s ease;
}
.tile:hover .media img, .tile:hover .media video { transform: scale(1.06); filter: saturate(1.22) contrast(1.07); }
/* wide diagrams: show the whole figure (no crop) on a clean backdrop */
.tile .media.fit-contain { background: #f4f6fb; }
.tile .media.fit-contain img, .tile .media.fit-contain video {
  object-fit: contain; padding: 10px; filter: none;
}
.tile:hover .media.fit-contain img, .tile:hover .media.fit-contain video { transform: scale(1.04); filter: none; }

/* split layout: image on top, text in a solid dark footer (for wide diagram tiles) */
.tile.tile-split .media { position: absolute; top: 0; left: 0; right: 0; bottom: 60px; height: auto; }
.tile.tile-split .overlay {
  top: auto; height: 60px; justify-content: center; padding: 8px 14px;
  background: var(--surface-2); border-top: 1px solid var(--border);
}
.tile.tile-split .name { font-size: 1rem; }
.tile.tile-split .ptitle { -webkit-line-clamp: 1; font-size: 0.72rem; margin-top: 2px; }
.tile.tile-split .go { display: none; }
.tile.tile-split .name, .tile.tile-split .ptitle { text-shadow: none; -webkit-text-stroke: 0; }
.tile.tile-split .name { color: var(--text); }
.tile.tile-split .ptitle { color: var(--text-dim); }
.tile.tile-split .media.fit-contain img, .tile.tile-split .media.fit-contain video { padding: 8px 12px; }
.tile .media.placeholder {
  display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(90% 90% at 25% 15%, rgba(224,49,79,0.22), transparent),
    radial-gradient(90% 90% at 85% 95%, rgba(245,158,11,0.20), transparent),
    var(--surface-2);
  color: var(--text); font-weight: 800; letter-spacing: 0.04em; font-size: 1.4rem;
}

/* artistic procedural tile (used for diagram/plot papers instead of the raw figure) */
.media.styled, .thumb.styled {
  position: absolute; inset: 0; overflow: hidden;
  background:
    radial-gradient(72% 92% at 12% 16%, var(--c1, rgba(224,49,79,.55)), transparent 60%),
    radial-gradient(66% 86% at 90% 26%, var(--c2, rgba(245,158,11,.5)), transparent 60%),
    radial-gradient(95% 85% at 55% 112%, var(--c3, rgba(124,58,10,.6)), transparent 64%),
    #0a0e1c;
}
.thumb.styled { position: relative; }
.media.styled::after, .thumb.styled::after {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(120% 90% at 18% 0%, rgba(255,255,255,0.12), transparent 55%);
}
.media.styled .tile-flow {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; opacity: 0.55;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 60%, transparent 94%);
  mask-image: linear-gradient(to bottom, #000 0%, #000 60%, transparent 94%);
}
.media.styled .tile-flow path {
  fill: none; stroke: url(#flowGrad); stroke-width: 1.1; opacity: 0.6;
  animation: drift 20s ease-in-out infinite alternate;
}
.media.styled .tile-flow path:nth-child(even) { animation-duration: 26s; opacity: 0.4; }
.media.styled .wm, .thumb.styled .wm {
  position: absolute; right: -4%; bottom: -16%; z-index: 0;
  font-weight: 800; letter-spacing: -0.04em; white-space: nowrap; pointer-events: none;
  color: rgba(255,255,255,0.12); line-height: 1;
  font-size: clamp(2.4rem, 8vw, 6.5rem);
}
.thumb.styled .wm { font-size: 1.9rem; right: -2%; bottom: -22%; }
.tile .overlay {
  position: absolute; inset: 0; z-index: 1;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 18px;
  background:
    linear-gradient(to bottom, rgba(5,6,10,0.40) 0%, transparent 22%),
    linear-gradient(to top, rgba(5,6,10,0.88) 0%, rgba(5,6,10,0.42) 30%, transparent 56%);
}
/* dark outline + halo keeps white text legible on white/light figures too */
.tile .name, .tile .ptitle {
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.95), 0 0 12px rgba(0,0,0,0.8);
  -webkit-text-stroke: 0.4px rgba(0,0,0,0.4);
}
.tile .t-top { position: absolute; top: 16px; left: 16px; right: 16px; z-index: 2; display: flex; gap: 8px; flex-wrap: wrap; }
.tile .name-row { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.tile .name { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.02em; line-height: 1.05; }
.tile .ptitle {
  color: rgba(255,255,255,0.94); font-size: 0.9rem; margin: 6px 0 0;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden;
}
.tile .go { margin-top: 12px; font-size: 0.82rem; font-weight: 700; color: var(--accent); }
.tile .go .arrow { display: inline-block; transition: transform 0.2s; }
.tile:hover .go .arrow { transform: translateX(4px); }

/* tile sizes */
.tile.size-lg   { grid-column: span 2; grid-row: span 2; }
.tile.size-wide { grid-column: span 2; }
.tile.size-tall { grid-row: span 2; }
/* on large tiles, scale up the title */
.tile.size-lg .name { font-size: 2rem; }
.tile.size-lg .ptitle { font-size: 1rem; }
/* on small tiles, keep the title compact so it fits */
.tile.size-sm .name { font-size: 1.12rem; }
.tile.size-sm .ptitle { font-size: 0.76rem; margin-top: 4px; -webkit-line-clamp: 2; }

.venue-badge {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em;
  padding: 4px 10px; border-radius: 6px;
  background: rgba(8,10,18,0.62); color: #fff;
  border: 1px solid rgba(255,255,255,0.18);
  backdrop-filter: blur(8px);
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}
.badge-soon {
  font-size: 0.68rem; font-weight: 700; letter-spacing: 0.06em;
  padding: 4px 10px; border-radius: 6px;
  background: rgba(8,10,18,0.62); color: #d9c6ff;
  border: 1px solid rgba(245,158,11,0.5); text-transform: uppercase;
  backdrop-filter: blur(8px);
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}
.tile.coming-soon { opacity: 0.92; }

/* "More to come" tile — a dashed, non-clickable placeholder closing the grid */
.tile.tile-more {
  border: 1px dashed var(--border-2); background: transparent;
  display: flex; align-items: center; justify-content: center; text-align: center;
}
.tile.tile-more:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: none; }
.tile.tile-more::after { display: none; }
.tile-more .more-inner {
  display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 16px;
}
.tile-more .more-plus {
  font-size: 2.2rem; font-weight: 300; line-height: 1; margin-bottom: 6px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tile-more .more-text { font-weight: 800; font-size: 1.05rem; color: var(--text); letter-spacing: -0.01em; }
.tile-more .more-sub { font-size: 0.76rem; color: var(--text-faint); }

/* ===== filter / research list ===== */
.filter-bar {
  display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 30px;
}
.filter-btn {
  padding: 8px 16px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface);
  color: var(--text-dim); font-size: 0.85rem; font-weight: 600;
  cursor: pointer; transition: all 0.18s;
}
.filter-btn:hover { color: var(--text); border-color: var(--border-2); }
.filter-btn.active { background: var(--grad); color: #0a0a12; border-color: transparent; }

.research-list { display: flex; flex-direction: column; gap: 14px; }

/* lineage strip — classical flow foundations above our own timeline */
.lineage { margin: 4px 0 30px; }
.lineage-label { margin-bottom: 16px; max-width: 720px; }
.lineage-label .kicker {
  font-size: 0.74rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); font-weight: 700; display: block; margin-bottom: 6px;
}
.lineage-label p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }
.lineage-row {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px;
}
.prior {
  position: relative; display: block; background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 14px 16px; color: inherit;
  transition: transform 0.18s, border-color 0.18s;
}
.prior:hover { transform: translateY(-3px); border-color: var(--accent); }
.prior-top { display: flex; align-items: baseline; justify-content: space-between; gap: 6px; }
.prior-name { font-weight: 800; font-size: 0.96rem; letter-spacing: -0.01em; }
.prior-year { font-family: "SF Mono", ui-monospace, Menlo, monospace; font-size: 0.72rem; color: var(--text-faint); }
.prior-auth { font-size: 0.74rem; color: var(--text-dim); margin: 2px 0 8px; }
.prior-desc { margin: 0; font-size: 0.78rem; color: var(--text-faint); line-height: 1.5; }
.prior-year::after { content: " ↗"; opacity: 0; transition: opacity 0.18s; color: var(--accent); }
.prior:hover .prior-year::after { opacity: 1; }
.prior-turn {
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(224,49,79,0.14), transparent 65%),
    var(--surface-2);
  border-color: var(--border-2);
}
.prior-turn .prior-name { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.prior-turn .prior-auth { color: var(--accent); }
@media (max-width: 980px) { .lineage-row { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) { .lineage-row { grid-template-columns: repeat(2, 1fr); } }

.ritem {
  display: grid; grid-template-columns: 130px 1fr auto; gap: 20px; align-items: center;
  padding: 16px 20px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}
.ritem:hover { border-color: var(--border-2); background: var(--surface-2); transform: translateX(3px); }
.ritem .thumb {
  width: 130px; height: 78px; border-radius: 10px; overflow: hidden;
  background: var(--surface-2);
}
.ritem .thumb img, .ritem .thumb video { width: 100%; height: 100%; object-fit: cover; }
.ritem .thumb.placeholder {
  display:flex; align-items:center; justify-content:center;
  background: radial-gradient(80% 80% at 30% 20%, rgba(224,49,79,0.18), transparent), var(--surface-2);
  color: var(--text-faint); font-weight:700; font-size:0.8rem;
}
.ritem .meta .rname { font-weight: 800; font-size: 1.05rem; letter-spacing: -0.01em; }
.ritem .meta .rname .venue-badge { margin-left: 8px; }
.ritem .meta .rtitle { color: var(--text-dim); font-size: 0.9rem; margin-top: 2px; }
.ritem .rlinks { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.rlink {
  font-size: 0.78rem; font-weight: 600; padding: 6px 12px; border-radius: 8px;
  border: 1px solid var(--border-2); color: var(--text-dim); white-space: nowrap;
  transition: all 0.18s;
}
.rlink:hover { color: var(--text); border-color: var(--accent); }
.ritem.hidden { display: none; }

/* related work (others' papers, no teaser) — compact, thumb-less row */
.ritem.ritem-rel {
  grid-template-columns: 1fr auto; gap: 16px; color: inherit;
  background: transparent; border-style: dashed; padding-left: 22px;
  position: relative;
}
.ritem.ritem-rel::before {
  content: ""; position: absolute; left: 0; top: 12px; bottom: 12px; width: 3px;
  border-radius: 3px; background: var(--border-2);
}
.ritem.ritem-rel:hover { background: var(--surface); border-color: var(--border-2); }
.ritem.ritem-rel:hover::before { background: var(--grad); }
.ritem.ritem-rel .rname { font-weight: 700; font-size: 1rem; }
.ritem.ritem-rel .rtitle { font-size: 0.86rem; }
.ritem.ritem-rel .rlink { border-color: var(--border); }
.ritem.ritem-rel:hover .rlink { color: var(--text); border-color: var(--accent); }
.related-badge {
  font-size: 0.64rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 2px 8px; border-radius: 6px; vertical-align: middle;
  color: var(--text-dim); background: transparent; border: 1px solid var(--border-2);
}
.venue-badge.rel {
  background: transparent; color: var(--text-faint); border-color: var(--border);
  font-weight: 600;
}

/* ===== overview / idea ===== */
.idea-lead { font-size: 1.12rem; color: var(--text-dim); max-width: 820px; }
.idea-lead strong { color: var(--text); }
.idea-sub { font-size: 1.0rem; color: var(--text-dim); max-width: 880px; margin: 40px 0 0; }
.idea-sub strong { color: var(--text); }

/* the core concept: x ⇌ z duality + three pillars */
.idea-core {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 22px;
  margin-top: 38px; align-items: stretch;
}
.nf-left {
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(224,49,79,0.10), transparent 60%),
    radial-gradient(120% 90% at 100% 100%, rgba(245,158,11,0.10), transparent 60%),
    var(--surface);
  border: 1px solid var(--border-2); border-radius: 18px; padding: 26px 28px;
}
.nf-tag {
  font-size: 0.74rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin-bottom: 18px;
}
.nf-eq {
  display: flex; align-items: center; justify-content: center; gap: 16px;
  flex-wrap: wrap; margin: 6px 0 18px;
}
.nf-var {
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 1.5rem; font-weight: 700; color: var(--text);
  padding: 8px 16px; border-radius: 12px;
  background: var(--surface-2); border: 1px solid var(--border-2);
}
.nf-arrows { display: flex; flex-direction: column; gap: 2px; line-height: 1.1; font-weight: 800; }
.nf-arrows .fa { color: var(--accent); font-size: 0.92rem; }
.nf-arrows .fb { color: var(--accent-2); font-size: 0.92rem; }
.nf-arrows sup { font-size: 0.62em; }
.nf-cap { color: var(--text-dim); font-size: 0.98rem; margin: 0 0 18px; line-height: 1.7; }
.nf-cap strong, .nf-cap em { color: var(--text); font-style: normal; }
.nf-dir { display: flex; flex-direction: column; gap: 12px; }
.nf-d { display: flex; gap: 14px; align-items: flex-start; }
.nf-d > div { color: var(--text-dim); font-size: 0.92rem; line-height: 1.55; }
.nf-d b { color: var(--text); }
.nf-d em { color: var(--accent); font-style: normal; }
.nf-op {
  flex: none; min-width: 46px; text-align: center;
  font-family: "SF Mono", ui-monospace, Menlo, monospace; font-weight: 800;
  font-size: 1.05rem; color: #0a0a12; background: var(--grad);
  border-radius: 10px; padding: 8px 6px;
}
.nf-op sup { font-size: 0.6em; }
.nf-formula {
  margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 1.05rem; color: var(--text);
}
.nf-formula .nf-jac { color: var(--accent-2); }
.nf-formula sub { font-size: 0.7em; }

.nf-right { display: flex; flex-direction: column; gap: 14px; }
.pillar {
  flex: 1; background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 18px 20px;
  transition: transform 0.2s, border-color 0.2s;
}
.pillar:hover { transform: translateY(-3px); border-color: var(--border-2); }
.pillar-h {
  font-weight: 800; font-size: 1.02rem; margin-bottom: 6px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; width: fit-content;
}
.pillar p { margin: 0; color: var(--text-dim); font-size: 0.9rem; line-height: 1.6; }
.pillar sup, .pillar sub { font-size: 0.7em; }

.flow-chain {
  display: flex; align-items: stretch; gap: 0; flex-wrap: wrap;
  margin-top: 40px; counter-reset: step;
}
.flow-node {
  flex: 1; min-width: 180px; padding: 22px 20px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; margin: 6px;
}
.flow-node .fn-name { font-weight: 800; color: var(--accent); margin-bottom: 6px; }
.flow-node .fn-desc { font-size: 0.86rem; color: var(--text-dim); }

/* why now — the three ingredients that make flows scale */
.why-now { margin-top: 48px; }
.why-head { max-width: 760px; margin-bottom: 26px; }
.why-head h3 { font-size: clamp(1.3rem, 2.6vw, 1.7rem); letter-spacing: -0.02em; margin: 8px 0 10px; }
.why-head p { color: var(--text-dim); margin: 0; font-size: 0.98rem; line-height: 1.7; }
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.why-card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 24px 22px 22px; overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}
.why-card:hover { transform: translateY(-4px); border-color: var(--border-2); }
.why-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--grad);
}
.why-n {
  font-family: "SF Mono", ui-monospace, Menlo, monospace; font-weight: 800;
  font-size: 0.9rem; color: var(--text-faint); letter-spacing: 0.08em; margin-bottom: 10px;
}
.why-t {
  font-weight: 800; font-size: 1.08rem; letter-spacing: -0.01em; margin-bottom: 12px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; width: fit-content;
}
.why-card p { margin: 0; color: var(--text-dim); font-size: 0.9rem; line-height: 1.65; }
.why-card p b { color: var(--accent); font-weight: 700; }
.why-card p em { color: var(--text); font-style: normal; font-weight: 600; }

.flow-chain {
  display: flex; align-items: stretch; gap: 0; flex-wrap: wrap;
  margin-top: 40px; counter-reset: step;
}
.connect { text-align: center; padding: 80px 0; }
.author-name {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem); font-weight: 800; letter-spacing: -0.02em;
  display: flex; align-items: baseline; justify-content: center; gap: 12px;
}
.author-zh { font-size: 0.62em; font-weight: 600; color: var(--text-dim); }
.author-note { color: var(--text-dim); max-width: 480px; margin: 14px auto 24px; font-size: 0.96rem; }
.social { display: flex; gap: 16px; justify-content: center; }
.social a {
  width: 46px; height: 46px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-2); background: var(--surface);
  color: var(--text-dim); transition: all 0.2s;
}
.social a:hover { color: var(--text); border-color: var(--accent); transform: translateY(-3px); }
.social svg { width: 20px; height: 20px; }

footer.site-foot {
  border-top: 1px solid var(--border); padding: 30px 0;
  color: var(--text-faint); font-size: 0.85rem; text-align: center;
}
footer.site-foot .foot-social { display: flex; gap: 14px; justify-content: center; margin-bottom: 16px; }
footer.site-foot .foot-social a {
  width: 40px; height: 40px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-2); background: var(--surface);
  color: var(--text-dim); transition: all 0.2s;
}
footer.site-foot .foot-social a:hover { color: var(--text); border-color: var(--accent); transform: translateY(-3px); }
footer.site-foot .foot-social svg { width: 18px; height: 18px; }

/* ============================================================
   POLISH LAYER — artistic / premium feel (Cambrian-inspired)
   ============================================================ */

/* fine grid + vignette texture across the whole page for depth */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    linear-gradient(to right, rgba(255,255,255,0.022) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(to bottom, rgba(255,255,255,0.022) 1px, transparent 1px) 0 0 / 64px 64px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, #000 0%, transparent 75%);
  mask-image: radial-gradient(120% 90% at 50% 0%, #000 0%, transparent 75%);
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(120% 80% at 50% 120%, rgba(224,49,79,0.05), transparent 60%);
}

/* hero: animated aurora blobs replace the static glow */
.hero::before {
  content: ""; position: absolute; inset: -45% -20% auto -20%; height: 900px; z-index: 0;
  background:
    radial-gradient(38% 42% at 28% 30%, rgba(224,49,79,0.40), transparent 60%),
    radial-gradient(34% 38% at 74% 22%, rgba(245,158,11,0.36), transparent 60%),
    radial-gradient(30% 34% at 55% 60%, rgba(251,191,36,0.24), transparent 60%);
  filter: blur(60px) saturate(125%);
  animation: aurora 18s ease-in-out infinite alternate;
}
@keyframes aurora {
  0%   { transform: translate3d(-3%, -2%, 0) scale(1);    }
  50%  { transform: translate3d(4%, 3%, 0)  scale(1.12);  }
  100% { transform: translate3d(-2%, 4%, 0) scale(1.05);  }
}

/* on-theme flowing "normalizing flow" lines drifting behind the hero */
.flow-bg {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 60%, transparent 100%);
  mask-image: linear-gradient(to bottom, #000 0%, #000 60%, transparent 100%);
}
.flow-bg svg { position: absolute; top: 0; left: 50%; width: 1500px; height: 100%; transform: translateX(-50%); }
.flow-bg path { fill: none; stroke: url(#flowGrad); stroke-width: 1.2; opacity: 0.5; animation: drift 22s ease-in-out infinite alternate; }
.flow-bg path:nth-child(even) { animation-duration: 28s; opacity: 0.32; }
@keyframes drift { from { transform: translateY(-14px); } to { transform: translateY(14px); } }

/* animated gradient sweep on the hero title */
.hero h1 .gradient-text {
  background: linear-gradient(100deg, #e0314f, #f59e0b, #fbbf24, #e0314f);
  background-size: 280% 100%;
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  animation: sweep 9s linear infinite;
}
@keyframes sweep { to { background-position: 280% 0; } }

/* shimmering ring under the hero eyebrow */
.hero .eyebrow {
  position: relative; overflow: hidden;
  background: rgba(224,49,79,0.07);
  box-shadow: 0 0 0 1px rgba(224,49,79,0.12), 0 6px 24px rgba(224,49,79,0.10);
}

/* primary button gets a soft animated glow */
.btn-primary { position: relative; }
.btn-primary::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit;
  box-shadow: 0 0 28px var(--accent-glow); opacity: 0; transition: opacity 0.3s;
}
.btn-primary:hover::after { opacity: 1; }

/* section kicker: little gradient tick */
.section-head .kicker { display: inline-flex; align-items: center; gap: 10px; }
.section-head .kicker::before {
  content: ""; width: 22px; height: 2px; border-radius: 2px; background: var(--grad);
}

/* tiles: glass sheen on hover + accent ring */
.tile::after {
  content: ""; position: absolute; inset: 0; z-index: 2; pointer-events: none;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0); transition: box-shadow 0.25s;
}
.tile:hover::after { box-shadow: inset 0 0 0 1px rgba(224,49,79,0.45); }

/* flow-chain connectors */
.flow-chain { position: relative; }
.flow-node { position: relative; transition: transform 0.2s, border-color 0.2s; }
.flow-node:hover { transform: translateY(-4px); border-color: var(--border-2); }
.flow-node::after {
  content: "→"; position: absolute; right: -20px; top: 50%; transform: translateY(-50%);
  color: var(--text-faint); font-weight: 700; z-index: 1;
}
.flow-node:last-child::after { display: none; }
@media (max-width: 760px) { .flow-node::after { display: none; } }
@media (max-width: 860px) {
  .idea-core { grid-template-columns: 1fr; }
}

/* scroll-reveal */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s cubic-bezier(.2,.7,.2,1), transform 0.7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.06s; }
.reveal.d2 { transition-delay: 0.12s; }
.reveal.d3 { transition-delay: 0.18s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero::before, .flow-bg path, .hero h1 .gradient-text { animation: none; }
}

/* ===== responsive ===== */
@media (max-width: 980px) {
  .bento { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 178px; }
  .tile.size-lg { grid-column: span 2; grid-row: span 2; }
  .tile.size-wide { grid-column: span 2; grid-row: span 1; }
  .tile.size-tall { grid-column: span 1; grid-row: span 2; }
}
@media (max-width: 720px) {
  .nav-links { display: none; }
  .hero { padding: 90px 0 60px; }
  .bento { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 150px; }
  .tile.size-lg { grid-column: span 2; grid-row: span 2; }
  .tile.size-wide { grid-column: span 2; grid-row: span 1; }
  .tile.size-tall { grid-column: span 1; grid-row: span 1; }
  .tile .name { font-size: 1.25rem; }
  .tile.size-lg .name { font-size: 1.6rem; }
  .ritem { grid-template-columns: 1fr; text-align: left; }
  .ritem .thumb { width: 100%; height: 150px; }
  .ritem .rlinks { justify-content: flex-start; }
}