@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&display=swap');

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

:root {
  --panel: #100d17;
  --border: #34303d;
  --hairline: rgba(255, 255, 255, 0.06);
  --text: #f5f5f5;
  --muted: #9b93a8;
  --faint: #6b6478;
  --accent: #bf98ff;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;
}

html {
  scroll-behavior: smooth;
}

body, html {
  font-family: var(--font);
  background: #080808;
  color: var(--text);
  line-height: 1.6;
}

a {
  color: var(--text);
  text-decoration: none;
}

.kicker {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #8b60cf;
}

.mono {
  font-family: var(--mono);
  font-size: 0.9em;
  color: var(--accent);
}

.dochead {
  padding: 8.5rem var(--gutter) 3.5rem;
  background: radial-gradient(ellipse at 50% -40%, #8000ff2e, transparent 62%);
  border-bottom: 1px solid var(--hairline);
}

.dochead h1 {
  margin-top: 0.75rem;
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
}

.lede {
  margin-top: 1rem;
  max-width: 34rem;
  font-size: 1.12rem;
  color: var(--muted);
  text-wrap: pretty;
}

.shell {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 4rem;
  padding: 3.5rem var(--gutter) 6rem;
  align-items: start;
}

.rail {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.toc {
  position: relative;
  display: flex;
  flex-direction: column;
  padding-left: 1rem;
}

.thread {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.thread-live {
  position: absolute;
  left: 0;
  top: 0;
  width: 1px;
  height: 0;
  background: var(--accent);
  box-shadow: 0 0 8px 0 #bf98ff88;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1),
              height 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.toc-item {
  padding: 0.42rem 0;
  font-size: 0.92rem;
  color: var(--faint);
  transition: color 0.18s ease-in-out;
}

.toc-item:hover,
.toc-item:focus-visible {
  color: var(--muted);
}

.toc-item.on {
  color: var(--text);
  font-weight: 600;
}

.toc-num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--border);
  margin-right: 0.55rem;
  transition: color 0.18s ease-in-out;
}

.toc-item.on .toc-num {
  color: var(--accent);
}

.tierbox {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding-left: 1rem;
}

.tierbox-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
}

.switch {
  display: flex;
  gap: 0.25rem;
  padding: 0.25rem;
  border: 1px solid var(--border);
  border-radius: 0.7rem;
  background: var(--panel);
}

.sw {
  flex: 1;
  padding: 0.4rem 0;
  border: none;
  border-radius: 0.5rem;
  background: none;
  color: var(--muted);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.18s ease-in-out, color 0.18s ease-in-out;
}

.sw:hover {
  color: var(--text);
}

.sw:focus-visible {
  outline: 2px solid #8b60cf;
  outline-offset: 2px;
}

.sw.on {
  background: #8000ff40;
  color: var(--text);
  box-shadow: inset 0 0 0 1px #8000ff80;
}

.tier-note {
  font-size: 0.75rem;
  color: var(--faint);
  text-wrap: pretty;
}

.doc {
  display: flex;
  flex-direction: column;
  gap: 4.5rem;
  min-width: 0;
}

.sec {
  scroll-margin-top: 6rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sec h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.sec h3 {
  margin-top: 0.75rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.sec p {
  max-width: 42rem;
  color: var(--muted);
  text-wrap: pretty;
}

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

.spec {
  margin-top: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.9rem;
  background: var(--panel);
  overflow: hidden;
}

.spec-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.75rem 1.1rem;
  border-top: 1px solid var(--hairline);
}

.spec-row:first-child {
  border-top: none;
}

.spec-k {
  font-size: 0.92rem;
  color: var(--muted);
}

.spec-v {
  font-family: var(--mono);
  font-size: 0.88rem;
  color: var(--text);
  text-align: end;
}

.spec-v.tv {
  color: var(--accent);
}

.spec .spec-cap {
  max-width: none;
  padding: 0.6rem 1.1rem;
  border-top: 1px solid var(--hairline);
  background: #0d0b13;
  font-size: 0.78rem;
  color: var(--faint);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip {
  padding: 0.28rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 100rem;
  background: var(--panel);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.chip.up {
  border-color: #8000ff80;
  background: #8000ff1a;
  color: var(--accent);
}

.chip-key {
  font-size: 0.78rem;
  color: var(--faint);
}

.badgelist {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.badge {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--panel);
}

.badge-icon {
  display: grid;
  place-items: center;
  height: 1.4rem;
  width: 1.4rem;
  flex: none;
}

.badge-icon svg {
  height: 1.4rem;
  width: 1.4rem;
}

.badge-text b {
  display: block;
  font-size: 0.92rem;
  font-weight: 600;
}

.badge-text span {
  display: block;
  font-size: 0.8rem;
  color: var(--faint);
  text-wrap: pretty;
}

.badge-text em {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--border);
}

.callout {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 0.5rem;
  padding: 0.9rem 1.1rem;
  border: 1px solid #8000ff55;
  border-radius: 0.75rem;
  background: #8000ff14;
  font-size: 0.9rem;
}

.callout b {
  font-weight: 600;
}

.callout span {
  color: var(--muted);
  text-wrap: pretty;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem var(--gutter);
  border-top: 1px solid var(--hairline);
  font-size: 0.85rem;
  color: var(--faint);
}

@media (max-width: 900px) {
  .shell {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    padding-top: 2rem;
  }

  .rail {
    position: static;
    flex-direction: column-reverse;
    gap: 1.25rem;
  }

  .toc {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.35rem;
    padding-left: 0;
  }

  .thread,
  .thread-live {
    display: none;
  }

  .toc-item {
    padding: 0.3rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 100rem;
    font-size: 0.82rem;
  }

  .toc-item.on {
    border-color: #8000ff80;
    background: #8000ff1a;
    color: var(--accent);
  }

  .toc-num {
    display: none;
  }

  .tierbox {
    padding-left: 0;
  }

  .spec-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
  }

  .spec-v {
    text-align: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .thread-live {
    transition: none;
  }
}