:root {
  --bg: #0e1214;
  --surface: #151b1f;
  --surface-2: #10161a;
  --border: #27313a;
  --border-strong: #38454f;
  --text: #e8eef1;
  --muted: #9db0b8;
  --accent: #ffb454;
  --accent-soft: rgba(255, 180, 84, 0.12);
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 10px;
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    transition: none !important;
  }
}

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

.wrap {
  max-width: 1060px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

.mono {
  font-family: var(--font-mono);
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #17110a;
  padding: 0.5rem 1rem;
  z-index: 10;
  font-weight: 600;
}

.skip:focus-visible {
  left: 0;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- header ---------- */

.site-head {
  border-bottom: 1px solid var(--border);
  background: rgba(14, 18, 20, 0.92);
}

.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: 0.9rem;
}

.wordmark {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.wordmark span {
  color: var(--muted);
  font-weight: 400;
}

.site-head nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  flex-wrap: wrap;
}

.site-head nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}

.site-head nav a:hover {
  color: var(--text);
}

.site-head nav a.ext {
  color: var(--accent);
}

/* ---------- hero ---------- */

.hero {
  padding-block: clamp(3.5rem, 9vw, 6rem) clamp(3rem, 7vw, 5rem);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 750;
  margin-bottom: 1.25rem;
  text-wrap: balance;
}

.hero h1 .accent {
  color: var(--accent);
}

.lede {
  max-width: 44rem;
  color: var(--muted);
  font-size: 1.08rem;
  margin-bottom: 2rem;
}

.cta-row {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.62rem 1.15rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: border-color 120ms ease, background-color 120ms ease;
}

.btn:hover {
  border-color: var(--accent);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #17110a;
}

.btn.primary:hover {
  background: #ffc477;
  border-color: #ffc477;
}

.facts {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  list-style: none;
}

.facts li {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.28rem 0.75rem;
}

/* ---------- sections ---------- */

.sec {
  padding-block: clamp(2.5rem, 6vw, 4rem);
  border-top: 1px solid var(--border);
}

.sec > .wrap > h2,
.sec h2 {
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  letter-spacing: -0.01em;
  font-weight: 700;
  margin-bottom: 0.9rem;
}

.sec-lede {
  max-width: 42rem;
  color: var(--muted);
  margin-bottom: 1.75rem;
}

.sec-lede sup,
.card sup {
  font-size: 0.7em;
}

/* ---------- flagship cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  transition: border-color 120ms ease;
}

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

.card h3 {
  font-size: 1.02rem;
}

.card h3 a {
  font-family: var(--font-mono);
  color: var(--text);
  text-decoration: none;
  font-weight: 650;
}

.card h3 a:hover {
  color: var(--accent);
}

.card h3 a::after {
  content: " \2197";
  color: var(--muted);
  font-size: 0.85em;
}

.card p {
  color: var(--muted);
  font-size: 0.93rem;
  flex-grow: 1;
}

.card .links,
.repo .links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.card .links a,
.repo .links a {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  text-decoration: none;
}

.card .links a:hover {
  text-decoration: underline;
}

.stars {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

/* ---------- papers strip ---------- */

.paper-strip {
  margin-top: 1.25rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface-2);
  padding: 1rem 1.25rem;
  display: flex;
  gap: 1.25rem;
  align-items: baseline;
  flex-wrap: wrap;
}

.paper-strip .label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.paper-strip a {
  color: var(--text);
  font-size: 0.92rem;
  text-decoration: none;
  border-bottom: 1px dotted var(--border-strong);
}

.paper-strip a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- LSD two-column ---------- */

.split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: start;
}

.split .body p {
  color: var(--muted);
  margin-bottom: 1rem;
  max-width: 36rem;
}

.split .body p strong {
  color: var(--text);
  font-weight: 600;
}

.link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.link-list li a {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent);
  text-decoration: none;
}

.link-list li a:hover {
  text-decoration: underline;
}

.paper-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem;
}

.paper-card .tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.7rem;
}

.paper-card h3 {
  font-size: 1.15rem;
  line-height: 1.3;
  margin-bottom: 0.4rem;
}

.paper-card .subtitle {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 0.9rem;
}

.paper-card .author {
  font-size: 0.88rem;
  margin-bottom: 1.1rem;
}

.doi-btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 0.45rem 0.8rem;
  text-decoration: none;
  margin-bottom: 1rem;
}

.doi-btn:hover {
  border-color: var(--accent);
}

.paper-card .gist {
  color: var(--muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  padding-top: 0.9rem;
}

/* ---------- smartcore band ---------- */

.band {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.6rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.band.sponsor {
  background: var(--accent-soft);
  border-color: rgba(255, 180, 84, 0.35);
}

.band .band-body {
  max-width: 40rem;
}

.band .band-body p {
  color: var(--muted);
  font-size: 0.96rem;
  margin-bottom: 1rem;
}

.band-meta {
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.big-stars {
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}

.big-stars-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- research grid ---------- */

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(235px, 1fr));
  gap: 1rem;
}

.repo {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.05rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  transition: border-color 120ms ease;
}

.repo:hover {
  border-color: var(--border-strong);
}

.repo h3 {
  font-size: 0.95rem;
}

.repo h3 a {
  font-family: var(--font-mono);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.repo h3 a::after {
  content: " \2197";
  color: var(--muted);
  font-size: 0.85em;
}

.repo h3 a:hover {
  color: var(--accent);
}

.repo p {
  color: var(--muted);
  font-size: 0.86rem;
  flex-grow: 1;
}

.chip {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.14rem 0.55rem;
}

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--border);
  padding-block: 2.25rem;
  margin-top: 1rem;
}

footer .cols {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

footer p {
  color: var(--muted);
  font-size: 0.9rem;
  max-width: 34rem;
  margin-bottom: 0.75rem;
}

footer nav {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

footer nav a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
}

footer nav a:hover {
  color: var(--accent);
}

.copyright {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  opacity: 0.7;
  margin-top: 0;
}

/* ---------- responsive ---------- */

@media (max-width: 820px) {
  .split {
    grid-template-columns: 1fr;
  }
  .band-meta {
    text-align: left;
  }
}