:root {
  --ink: #182033;
  --muted: #5b6475;
  --line: #d8dee9;
  --surface: #ffffff;
  --surface-alt: #f5f7fb;
  --green: #1c7c54;
  --green-dark: #11553b;
  --blue: #2357c5;
  --coral: #cc5a43;
  --gold: #d29b25;
  --shadow: 0 20px 60px rgba(24, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid rgba(216, 222, 233, 0.75);
  backdrop-filter: blur(14px);
}

.wordmark {
  font-weight: 800;
  font-size: 1.2rem;
  text-decoration: none;
  letter-spacing: 0;
}

.top-nav {
  display: flex;
  gap: clamp(16px, 3vw, 32px);
  color: var(--muted);
  font-size: 0.95rem;
}

.top-nav a {
  text-decoration: none;
}

.top-nav a:hover {
  color: var(--ink);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  padding: 136px clamp(20px, 6vw, 96px) 72px;
  background: #f8fafc;
}

.hero-background {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-background::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(248, 250, 252, 0.98) 0%, rgba(248, 250, 252, 0.78) 42%, rgba(248, 250, 252, 0.28) 100%),
    repeating-linear-gradient(90deg, rgba(35, 87, 197, 0.06) 0 1px, transparent 1px 120px),
    repeating-linear-gradient(0deg, rgba(28, 124, 84, 0.05) 0 1px, transparent 1px 120px);
}

.slack-thread,
.doc-panel {
  position: absolute;
  right: clamp(24px, 7vw, 116px);
  width: min(480px, 42vw);
  border: 1px solid rgba(24, 32, 51, 0.12);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.slack-thread {
  top: 18vh;
  padding: 22px;
  display: grid;
  gap: 12px;
}

.thread-line {
  width: fit-content;
  max-width: 92%;
  padding: 11px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.45;
}

.from-user {
  background: #eef2f8;
}

.from-choir {
  justify-self: end;
  background: #e5f4ec;
  color: var(--green-dark);
}

.doc-panel {
  top: 52vh;
  padding: 26px;
}

.doc-heading {
  margin-bottom: 18px;
  font-weight: 750;
}

.doc-line,
.doc-highlight {
  height: 12px;
  margin: 12px 0;
  background: #dfe5ee;
  border-radius: 999px;
}

.doc-line.wide {
  width: 92%;
}

.doc-line {
  width: 76%;
}

.doc-line.short {
  width: 54%;
}

.doc-highlight {
  width: 68%;
  background: rgba(28, 124, 84, 0.24);
}

.sync-path {
  position: absolute;
  top: 45vh;
  right: min(41vw, 520px);
  width: 180px;
  height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--green));
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.eyebrow,
.section-kicker,
.paper-label {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(4rem, 13vw, 10.5rem);
  line-height: 0.86;
  letter-spacing: 0;
}

.subtitle {
  max-width: 700px;
  color: #2e3748;
  font-size: clamp(1.24rem, 2.4vw, 2rem);
  line-height: 1.28;
}

.hero-actions,
.install-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  font: inherit;
  font-weight: 750;
  text-decoration: none;
}

.button.primary {
  color: #fff;
  background: var(--ink);
}

.button.primary:hover {
  background: #000;
}

.button:disabled,
.button:disabled:hover {
  color: #7a8394;
  background: #e8ecf3;
  border-color: #cfd6e2;
  cursor: not-allowed;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.7);
}

.summary-band {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.summary-item {
  min-height: 156px;
  padding: clamp(24px, 4vw, 42px);
  background: var(--surface);
}

.summary-item strong {
  display: block;
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.summary-item span {
  color: var(--muted);
  line-height: 1.55;
}

.section {
  padding: clamp(72px, 10vw, 128px) clamp(20px, 6vw, 96px);
}

.section-header {
  max-width: 850px;
  margin-bottom: 36px;
}

h2 {
  max-width: 900px;
  margin-bottom: 18px;
  font-size: clamp(2rem, 5vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: 0;
}

.section-header p,
.split-section p,
.paper-box p {
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.65;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.feature-grid-4 {
  grid-template-columns: repeat(2, 1fr);
}

.feature-card,
.paper-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: clamp(22px, 3vw, 32px);
  background: var(--surface);
}

.feature-index {
  color: var(--coral);
  font-weight: 800;
}

.feature-card h3,
.paper-box h3 {
  margin: 18px 0 10px;
  font-size: 1.32rem;
}

.feature-card p {
  color: var(--muted);
  line-height: 1.6;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
  background: var(--surface-alt);
}

.paper-box {
  background: #fff;
  box-shadow: var(--shadow);
}

.paper-meta {
  color: var(--gold);
  font-weight: 700;
}

.text-link {
  color: var(--blue);
  font-weight: 750;
}

.award-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background: #fef3cd;
  color: #8a6000;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}

.paper-authors {
  color: var(--ink);
  font-size: 0.95rem;
  margin-bottom: 6px;
}

.paper-links {
  display: flex;
  gap: 20px;
  margin-top: 16px;
}

.bibtex {
  margin-top: 18px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.bibtex summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
  user-select: none;
  list-style: none;
}

.bibtex summary::before {
  content: "+ ";
}

details[open] .bibtex summary::before {
  content: "− ";
}

.bibtex pre {
  margin: 12px 0 0;
  padding: 14px;
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 0.78rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.video-embed {
  margin-top: 28px;
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
}

.video-embed iframe {
  display: block;
  width: 100%;
  height: 100%;
}

.install-section {
  text-align: center;
}

.install-section .section-header {
  margin-left: auto;
  margin-right: auto;
}

.install-actions {
  justify-content: center;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 26px clamp(20px, 6vw, 96px);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 900px) {
  .top-nav {
    display: none;
  }

  .hero {
    min-height: 880px;
    align-items: start;
  }

  .slack-thread,
  .doc-panel {
    left: 20px;
    right: 20px;
    width: auto;
  }

  .slack-thread {
    top: 520px;
  }

  .doc-panel {
    top: 710px;
  }

  .sync-path {
    display: none;
  }

  .summary-band,
  .feature-grid,
  .split-section {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .hero-actions,
  .install-actions {
    flex-direction: column;
  }

  .button {
    justify-content: center;
    width: 100%;
  }
}