:root {
  --bg: #f4f1ea;
  --bg-raise: #fffcf8;
  --ink: #343057;
  --ink-soft: #5e5878;
  --muted: #7a748f;
  --line: #e4dcea;
  --purple: #6d5cae;
  --purple-deep: #4d427f;
  --lavender: #efe8f8;
  --lavender-2: #f6f2fb;
  --teal: #227f80;
  --mint: #e5f5f1;
  --blue: #3d74e0;
  --sky: #e8f0fb;
  --peach: #f8eadc;
  --orange: #d9844a;
  --shadow: 0 16px 40px rgba(52, 48, 87, 0.06);
  --serif: "Fraunces", "Iowan Old Style", Palatino, serif;
  --sans: "Outfit", "Avenir Next", "Segoe UI", sans-serif;
  --max: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(880px 420px at 0% -8%, rgba(109, 92, 174, 0.16), transparent 62%),
    radial-gradient(760px 380px at 100% 0%, rgba(34, 127, 128, 0.13), transparent 58%),
    var(--bg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--purple-deep); }
a:hover { color: var(--teal); }
:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 12px;
  top: -80px;
  background: var(--ink);
  color: white;
  padding: 8px 12px;
  border-radius: 8px;
  z-index: 20;
}
.skip:focus { top: 12px; }

.top {
  --pad-top: 14px;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: var(--pad-top) 28px 14px;
  background: rgba(244, 241, 234, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(228, 220, 234, 0.9);
}
.brand {
  position: relative;
  display: inline-block;
  font-family: var(--serif);
  font-weight: 560;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.brand::before {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  top: calc(-1 * var(--pad-top));
  height: 8px;
  background: var(--ink);
  border-radius: 0 0 8px 8px;
  pointer-events: none;
}
.nav {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  font-size: 0.92rem;
}
.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
}
.nav a:hover { color: var(--ink); }

.wrap { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }
.hero { padding: 72px 0 28px; }
.kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  color: var(--purple-deep);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.dash {
  width: 34px;
  height: 3px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--blue), var(--teal) 55%, var(--purple));
  flex: none;
}
h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 560;
  font-size: clamp(2.15rem, 6vw, 4.35rem);
  letter-spacing: -0.035em;
  line-height: 0.95;
}
.subtitle {
  max-width: 18em;
  margin: 18px 0 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.dek {
  max-width: 44rem;
  margin: 22px 0 0;
  color: var(--ink-soft);
  font-size: 1.05rem;
}
.authors {
  margin: 28px 0 0;
  font-size: 0.98rem;
}
.authors sup { font-size: 0.68em; }
.affil {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}
.affiliation-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 28px 40px;
  margin: 22px 0 0;
}
.affiliation-row img {
  width: auto;
  height: auto;
}
.affiliation-row img[data-logo="cuhksz"] { max-height: 48px; }
.affiliation-row img[data-logo="amphion"] { max-height: 42px; }
.demo {
  width: 100%;
  display: block;
  background: #161326;
  border-radius: 18px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.btn.primary { background: var(--ink); color: #f7f4ee; }
.btn.primary:hover { background: var(--purple-deep); color: white; }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: #d9d1e6;
}
.btn.ghost:hover { border-color: var(--purple); color: var(--purple-deep); }
.btn[aria-disabled="true"] {
  color: var(--muted);
  cursor: default;
}

.band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 36px auto 10px;
}
.stat {
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 16px 14px;
  box-shadow: var(--shadow);
}
.stat b {
  display: block;
  font-family: var(--serif);
  font-size: 1.85rem;
  font-weight: 560;
  letter-spacing: -0.03em;
  line-height: 1;
}
.stat span { display: block; margin-top: 6px; color: var(--ink-soft); font-size: 0.86rem; }
.stat em { font-style: normal; color: var(--teal); font-weight: 600; }
.stat-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

section { padding: 54px 0 10px; }
h2 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 560;
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}
.lead { max-width: 46rem; margin: 0 0 22px; color: var(--ink-soft); }

.figure {
  margin: 0;
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.figure img { width: 100%; }
.figure figcaption {
  padding: 12px 16px 14px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.figure figcaption strong { color: var(--ink); font-weight: 600; }

.prose { max-width: 46rem; }
.prose p { margin: 0 0 14px; }

.story {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 14px;
}
.story article, .mod, .chip, .note, .spec {
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.story article { padding: 16px 16px 14px; }
.story .n {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}
.story h3, .mod h3 { margin: 6px 0 6px; font-size: 1.02rem; }
.story p, .mod p, .walk p { margin: 0; color: var(--ink-soft); font-size: 0.92rem; }
.walk {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}
.walk article {
  display: grid;
  grid-template-columns: 7.2rem 1fr;
  gap: 4px 18px;
  align-items: baseline;
  padding: 14px 16px;
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.walk .n {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
}
.walk strong { color: var(--ink); font-weight: 600; }

.mods {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.mod { padding: 16px 16px 15px; border-top: 4px solid var(--purple); }
.mod.policy { border-top-color: var(--purple); }
.mod.intake { border-top-color: var(--blue); }
.mod.hold { border-top-color: var(--teal); }
.mod.worker { border-top-color: var(--orange); }
.mod.deliver { border-top-color: #8b74d6; }
.mod.memory { border-top-color: #3f6fbf; }
.mod .tag {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.chip {
  padding: 8px 12px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.chip b { color: var(--ink); font-weight: 600; }

.spec {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: 18px;
  overflow: hidden;
}
.spec div { padding: 14px 16px; border-right: 1px solid var(--line); }
.spec div:last-child { border-right: 0; }
.spec span { display: block; color: var(--muted); font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 600; }
.spec b { display: block; margin-top: 4px; font-weight: 500; font-size: 0.95rem; }

.note {
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--lavender-2);
  border-color: #e3daf2;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.note strong { color: var(--ink); }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--bg-raise);
  box-shadow: var(--shadow);
}
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 11px 14px; vertical-align: top; border-bottom: 1px solid var(--line); }
th { background: #efeaf8; color: var(--ink); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
tbody tr:nth-child(even) td { background: #faf9fc; }

.cite {
  background: var(--ink);
  color: #efeaf8;
  border-radius: 18px;
  padding: 18px 18px 16px;
  position: relative;
}
.cite pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  line-height: 1.55;
}
.copy {
  position: absolute;
  top: 12px;
  right: 12px;
  border: 0;
  border-radius: 999px;
  background: #efeaf8;
  color: var(--ink);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 12px;
  cursor: pointer;
}
.copy:hover { background: white; }

.foot {
  margin-top: 28px;
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 0.88rem;
  border-top: 1px solid var(--line);
}
.foot a { color: var(--ink-soft); }

@media (max-width: 860px) {
  .band, .mods, .story, .spec { grid-template-columns: 1fr 1fr; }
  .spec div { border-right: 0; border-bottom: 1px solid var(--line); }
  .top { --pad-top: 12px; padding: var(--pad-top) 16px 12px; }
  .hero { padding-top: 42px; }
}
@media (max-width: 640px) {
  .band, .story, .spec { grid-template-columns: 1fr; }
  .walk article { grid-template-columns: 1fr; gap: 2px; }
  .mods { grid-template-columns: 1fr; }
  .wrap { width: min(var(--max), calc(100% - 28px)); }
  .nav { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}