:root {
  --void: #070812;
  --surface: rgba(15, 17, 32, 0.78);
  --surface-strong: rgba(23, 25, 44, 0.9);
  --surface-soft: rgba(255, 255, 255, 0.035);
  --line: rgba(255, 255, 255, 0.1);
  --line-strong: rgba(255, 255, 255, 0.19);
  --text: #f1f2f8;
  --muted: #a4a8b8;
  --muted-2: #777c90;
  --violet: #9b87ff;
  --cyan: #43d8ed;
  --magenta: #f08ac0;
  --green: #79d7aa;
  --amber: #f5c96a;
  --danger: #ff8d9d;
  --radius: 16px;
  --sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --display: "Space Grotesk", var(--sans);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: var(--void);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--void);
  font-family: var(--sans);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--cyan);
  text-underline-offset: 0.2em;
}

a:hover { text-decoration-thickness: 2px; }

button, input, textarea { font: inherit; }

:focus-visible {
  outline: 2px solid var(--violet);
  outline-offset: 3px;
}

.skip {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  transform: translateY(-180%);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
  color: #090a12;
  background: var(--text);
  font-weight: 600;
}

.skip:focus { transform: translateY(0); }

.aurora,
.grid-field {
  position: fixed;
  inset: 0;
  z-index: -2;
  overflow: hidden;
  pointer-events: none;
}

.aurora-blob {
  position: absolute;
  width: 58vmax;
  height: 58vmax;
  border-radius: 50%;
  filter: blur(85px);
  opacity: 0.13;
}

.aurora-violet { top: -36vmax; left: -20vmax; background: var(--violet); }
.aurora-cyan { top: -30vmax; right: -31vmax; background: var(--cyan); opacity: 0.1; }
.aurora-magenta { bottom: -45vmax; left: 36%; background: var(--magenta); opacity: 0.07; }

.grid-field {
  z-index: -1;
  opacity: 0.3;
  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: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 82%);
}

.glass {
  background: var(--surface);
  border: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  min-height: 62px;
  gap: 1rem;
  padding: 0.65rem max(1rem, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(7, 8, 18, 0.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.82rem;
  text-decoration: none;
  white-space: nowrap;
}

.wordmark-mark {
  display: grid;
  width: 31px;
  height: 31px;
  place-items: center;
  border: 1px solid rgba(155, 135, 255, 0.55);
  border-radius: 9px;
  color: #d8d0ff;
  background: rgba(155, 135, 255, 0.12);
  font-family: var(--display);
  font-weight: 700;
}

.site-header nav {
  display: flex;
  gap: 1rem;
  margin-left: auto;
}

.site-header nav a {
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
}

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

.shell {
  width: min(1120px, calc(100% - 2rem));
  min-height: calc(100vh - 130px);
  margin: 0 auto;
  padding: 4.3rem 0 5rem;
}

.hero {
  max-width: 720px;
  margin-bottom: 2.1rem;
}

.eyebrow,
.paper-kicker {
  margin: 0 0 0.65rem;
  color: var(--violet);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.8rem, 8vw, 5.9rem);
  font-weight: 600;
  letter-spacing: -0.065em;
  line-height: 0.95;
}

.hero-copy {
  max-width: 52ch;
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.16rem);
}

.repo-card {
  overflow: hidden;
  border-radius: var(--radius);
}

.repo-topline {
  display: flex;
  align-items: center;
  min-height: 54px;
  gap: 1rem;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
}

.breadcrumbs,
.document-breadcrumbs {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 0.35rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
  overflow-x: auto;
  white-space: nowrap;
}

.breadcrumbs a,
.document-breadcrumbs a {
  color: var(--text);
  text-decoration: none;
}

.breadcrumbs a:hover,
.document-breadcrumbs a:hover { color: var(--cyan); }

.crumb-separator { color: var(--muted-2); }
.crumb-current { color: var(--muted); }
.repo-count { margin-left: auto; color: var(--muted-2); font-family: var(--mono); font-size: 0.72rem; white-space: nowrap; }

.repo-head,
.repo-row {
  display: grid;
  grid-template-columns: minmax(220px, 1.6fr) minmax(180px, 1fr) minmax(110px, 0.48fr);
  align-items: center;
  column-gap: 1.2rem;
}

.repo-head {
  min-height: 35px;
  padding: 0.35rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted-2);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.repo-row {
  position: relative;
  min-height: 57px;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}

.repo-row:last-child { border-bottom: 0; }
.repo-row:hover { background: rgba(255, 255, 255, 0.045); text-decoration: none; }

.repo-name {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 0.75rem;
}

.repo-icon {
  display: inline-grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: var(--surface-soft);
  font-family: var(--mono);
  font-size: 0.74rem;
}

.repo-row[data-kind="folder"] .repo-icon { color: var(--violet); border-color: rgba(155, 135, 255, 0.3); }
.repo-row[data-kind="pdf"] .repo-icon { color: var(--danger); border-color: rgba(255, 141, 157, 0.3); }
.repo-row[data-kind="note"] .repo-icon { color: var(--cyan); border-color: rgba(67, 216, 237, 0.3); }

.repo-title {
  overflow: hidden;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.84rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.repo-detail,
.repo-updated {
  overflow: hidden;
  color: var(--muted);
  font-size: 0.76rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.repo-updated { color: var(--muted-2); text-align: right; }

.loading-row,
.empty-row {
  display: flex;
  min-height: 120px;
  align-items: center;
  justify-content: center;
  gap: 0.7rem;
  padding: 1.5rem;
  color: var(--muted);
  text-align: center;
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--line-strong);
  border-top-color: var(--violet);
  border-radius: 50%;
}

@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: no-preference) {
  html.js .repo-row { transition: background 130ms ease; }
  html.js .spinner { animation: spin 600ms linear infinite; }
}

.document-breadcrumbs {
  margin: 0 0 1rem;
  padding: 0.25rem 0.15rem;
}

.paper-card {
  overflow: hidden;
  border-radius: 22px;
}

.paper-header {
  padding: clamp(1.5rem, 5vw, 4rem) clamp(1.25rem, 6vw, 5.25rem) 1.5rem;
}

.paper-title {
  max-width: 19ch;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.15rem, 5.2vw, 4.75rem);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 1;
}

.paper-subtitle {
  max-width: 48ch;
  margin: 1rem 0 0;
  color: #ccd0df;
  font-family: var(--display);
  font-size: clamp(1rem, 2.2vw, 1.35rem);
}

.paper-byline,
.paper-summary {
  max-width: 68ch;
  margin: 0.9rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.paper-summary {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  line-height: 1.7;
}

.document-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding: 0 clamp(1.25rem, 6vw, 5.25rem) 1.5rem;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  gap: 0.4rem;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 0.45rem 0.8rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  border-color: rgba(255, 255, 255, 0.32);
  background: rgba(255, 255, 255, 0.075);
  text-decoration: none;
}

.note-content {
  border-top: 1px solid var(--line);
}

.note-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.85rem;
  padding: 1.15rem clamp(1.25rem, 6vw, 5.25rem);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.note-toc a {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  text-decoration: none;
}

.note-toc a:hover { color: var(--cyan); }

.paper-article {
  max-width: 82ch;
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 4rem) clamp(1.25rem, 6vw, 5.25rem) clamp(2.2rem, 7vw, 5.5rem);
  color: #d9dbe5;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.78;
}

.paper-article > :first-child { margin-top: 0; }
.paper-article > :last-child { margin-bottom: 0; }

.paper-article h2,
.paper-article h3,
.paper-article h4 {
  color: var(--text);
  font-family: var(--display);
  line-height: 1.2;
  scroll-margin-top: 80px;
}

.paper-article h2 {
  margin: 2.8rem 0 0.85rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.03em;
}

.paper-article h3 { margin: 2rem 0 0.7rem; font-size: 1.25rem; }
.paper-article h4 { margin: 1.5rem 0 0.5rem; font-size: 1.06rem; }
.paper-article p { margin: 0.85rem 0; }
.paper-article strong { color: var(--text); }

.paper-article a { color: #7de5f4; }

.paper-article blockquote {
  margin: 1.5rem 0;
  border-left: 3px solid var(--violet);
  padding: 0.25rem 0 0.25rem 1.2rem;
  color: #c7c9d4;
  font-style: italic;
}

.paper-article blockquote > :first-child { margin-top: 0; }
.paper-article blockquote > :last-child { margin-bottom: 0; }

.paper-article ul,
.paper-article ol { padding-left: 1.5rem; }
.paper-article li { margin: 0.4rem 0; padding-left: 0.2rem; }
.paper-article li.task-list-item { list-style: none; }
.paper-article input[type="checkbox"] { margin-left: -1.35rem; margin-right: 0.45rem; accent-color: var(--violet); }

.paper-article code {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 5px;
  padding: 0.08em 0.34em;
  color: #e5e2ff;
  background: rgba(155, 135, 255, 0.08);
  font-family: var(--mono);
  font-size: 0.84em;
}

.paper-article pre {
  overflow-x: auto;
  margin: 1.4rem 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  background: #090a13;
  line-height: 1.55;
}

.paper-article pre code { border: 0; padding: 0; background: transparent; }

.paper-article table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.82rem;
}

.paper-article th,
.paper-article td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.72rem;
  text-align: left;
  vertical-align: top;
}

.paper-article th { color: var(--text); background: rgba(255, 255, 255, 0.045); }
.paper-article img { display: block; max-width: 100%; height: auto; margin: 1.5rem auto; border-radius: 12px; }
.paper-article hr { margin: 2.4rem 0; border: 0; border-top: 1px solid var(--line); }

.paper-article .footnotes {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88em;
}

.paper-article .footnotes h2 { border: 0; padding-top: 0; font-size: 1.15rem; }
.paper-article sup { line-height: 0; }

.paper-article .katex {
  display: inline-block;
  max-width: 100%;
  overflow-x: auto;
  vertical-align: middle;
}

.paper-article .math-display {
  display: block;
  margin: 1.4rem 0;
  text-align: center;
}

.paper-article math { color: var(--text); font-size: 1.04em; }

.pdf-reader {
  border-top: 1px solid var(--line);
  background: #11121c;
}

.pdf-reader iframe {
  display: block;
  width: 100%;
  height: max(72vh, 720px);
  border: 0;
  background: #202124;
}

.pdf-fallback {
  display: none;
  padding: 1rem;
  color: var(--muted);
  text-align: center;
}

.error-card {
  max-width: 720px;
  border-radius: var(--radius);
  padding: clamp(1.4rem, 5vw, 3rem);
}

.error-card h1 {
  margin: 0 0 0.8rem;
  font-family: var(--display);
  font-size: clamp(2rem, 5vw, 3.4rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.error-card p:not(.eyebrow) { color: var(--muted); }

footer {
  display: flex;
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted-2);
  font-family: var(--mono);
  font-size: 0.68rem;
}

@media (max-width: 720px) {
  .site-header { padding-inline: 1rem; }
  .site-header nav { gap: 0.7rem; }
  .shell { width: min(100% - 1rem, 1120px); padding-top: 2.8rem; }
  .repo-head { display: none; }
  .repo-row {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.5rem;
    padding-block: 0.75rem;
  }
  .repo-detail { grid-column: 1; padding-left: 2.45rem; }
  .repo-updated { grid-column: 2; grid-row: 1; }
  .paper-card { border-radius: 14px; }
  .paper-header { padding-top: 2rem; }
  .paper-article table { display: block; overflow-x: auto; white-space: nowrap; }
  .pdf-reader iframe { height: 76vh; min-height: 520px; }
  footer { flex-direction: column; }
}

@media (max-width: 460px) {
  .wordmark span:last-child { display: none; }
  .hero h1 { font-size: 3.4rem; }
  .repo-topline { align-items: flex-start; flex-direction: column; gap: 0.35rem; }
  .repo-count { margin-left: 0; }
  .repo-updated { display: none; }
  .repo-row { grid-template-columns: 1fr; }
  .repo-detail { grid-column: 1; }
  .paper-title { font-size: 2.35rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .spinner { animation: none; border-top-color: var(--line-strong); }
}