:root {
  --canvas: #fdfcfc;
  --surface-soft: #f8f7f7;
  --surface-card: #f1eeee;
  --surface-dark: #201d1d;
  --surface-dark-elevated: #302c2c;

  --ink: #201d1d;
  --ink-deep: #0f0000;
  --charcoal: #302c2c;
  --body: #424245;
  --mute: #646262;
  --stone: #6e6e73;
  --ash: #9a9898;

  --on-dark: #fdfcfc;
  --on-dark-mute: #9a9898;

  --hairline: rgba(15, 0, 0, 0.12);
  --hairline-strong: #646262;

  --accent: #007aff;
  --accent-hover: #0056b3;
  --accent-active: #004085;

  --r-sm: 4px;
  --r-full: 9999px;

  --font-mono: "JetBrains Mono", "Berkeley Mono", "SF Mono", ui-monospace, Menlo, "Liberation Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "calt";
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

::selection { background: var(--ink); color: var(--canvas); }

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
  background: var(--canvas);
}

.topbar__row {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--body);
  min-width: 0;
}

.topbar__row:last-child {
  margin-left: auto;
}

.topbar__path {
  display: none;
}

.topbar__brand {
  color: var(--ink);
  font-weight: 700;
}

.topbar__sep, .topbar__path { color: var(--mute); }

.badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: var(--r-sm);
  background: var(--surface-dark);
  color: var(--on-dark);
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
}

.topbar__link {
  color: var(--ink);
  font-weight: 500;
  border-bottom: 1px dashed var(--hairline-strong);
  padding-bottom: 1px;
}

.topbar__link:hover {
  border-bottom-color: var(--ink);
  color: var(--ink-deep);
}

/* Page */
.page {
  width: min(100%, 720px);
  margin: 0 auto;
  padding: 24px 16px 120px;
}

/* Hero */
.hero {
  padding: 8px 0 24px;
}

.kicker {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--mute);
  word-break: break-word;
}

.display {
  margin: 0;
  font-size: clamp(26px, 7.5vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  letter-spacing: 0;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

.display br { display: none; }

.display__mark {
  display: inline;
  background: var(--ink);
  color: var(--canvas);
  padding: 0 4px;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.lede {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.6;
  color: var(--body);
}

.cta-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 24px 0 0;
}

.cta-note {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--mute);
  word-break: break-word;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 4px 18px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease, border-color 120ms ease;
  white-space: nowrap;
  width: 100%;
}

.btn:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.btn--primary {
  background: var(--ink);
  color: var(--on-dark);
  border-color: var(--ink);
}

.btn--primary:hover { background: var(--ink-deep); border-color: var(--ink-deep); }

.btn--ghost {
  background: var(--canvas);
  color: var(--ink);
  border-color: var(--hairline-strong);
}

.btn--ghost:hover { background: var(--surface-soft); }

.btn--full { width: 100%; }

/* Rule */
.rule {
  margin: 36px 0;
  border: 0;
  border-top: 1px solid var(--hairline);
}

/* What */
.what__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--hairline);
}

.topic {
  padding: 20px 0;
  border-bottom: 1px solid var(--hairline);
}

.topic__id {
  margin: 0 0 6px;
  font-size: 14px;
  color: var(--mute);
}

.topic__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.topic__copy {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--body);
  max-width: 60ch;
}

/* Channel */
.channel__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 18px;
}

.channel__avatar {
  width: 64px;
  height: 64px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-sm);
  overflow: hidden;
  background: var(--surface-card);
}

.channel__avatar img { width: 100%; height: 100%; object-fit: cover; }

.channel__title {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
}

.channel__handle {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--mute);
}

.channel__copy {
  margin: 0 0 18px;
  font-size: 16px;
  color: var(--body);
  max-width: 64ch;
}

.specs {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  border-top: 1px solid var(--hairline);
}

.specs li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--hairline);
  font-size: 14px;
  word-break: break-word;
}

.specs__v { text-align: right; }

.specs__k { color: var(--mute); }
.specs__v { color: var(--ink); font-weight: 500; }

/* FAQ */
.faq__list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hairline);
}

.faq__row {
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
}

.faq__row dt {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  word-break: break-word;
}

.faq__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--body);
  max-width: 64ch;
}

/* Footer */
.footer {
  padding-top: 8px;
}

.footer__row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--mute);
}

.footer__fineprint {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--stone);
  max-width: 84ch;
}

/* Sticky CTA (mobile only) */
.sticky-cta {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: calc(12px + env(safe-area-inset-bottom));
  z-index: 30;
  opacity: 0;
  transform: translateY(18px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.sticky-cta.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Responsive */
@media (min-width: 720px) {
  .topbar { padding: 16px 24px; }
  .topbar__path { display: inline; }
  .page { padding: 40px 24px 140px; width: min(100%, 880px); }
  .display { font-size: clamp(36px, 5vw, 48px); }
  .cta-row { flex-direction: row; flex-wrap: wrap; }
  .btn { width: auto; }
  .btn--full { width: 100%; }
  .what__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-top: 0;
  }
  .topic {
    padding: 22px 24px;
    border: 1px solid var(--hairline);
    border-right-width: 0;
  }
  .topic:last-child { border-right-width: 1px; }
}

@media (min-width: 980px) {
  .display { font-size: 44px; }
  .sticky-cta { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}