:root {
  color-scheme: light dark;
  --ground: #f4f6f4;
  --surface: #fcfdfc;
  --band: #e9ede9;
  --text: #1b1f1d;
  --muted: #626b66;
  --faint: #747d78;
  --rule: #d5dbd6;
  --accent: #34528c;
  --accent-ink: #fff;
  --serif: Literata, Charter, "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground: #131614;
    --surface: #191d1a;
    --band: #1a1f1c;
    --text: #d5d9d5;
    --muted: #929b96;
    --faint: #7f8985;
    --rule: #2c322e;
    --accent: #97b2e4;
    --accent-ink: #131614;
  }
}

* { box-sizing: border-box; }

html,
body { height: 100%; }

body {
  margin: 0;
  overflow: hidden;
  background: var(--ground);
  color: var(--text);
  font-family: var(--sans);
}

button,
textarea { font: inherit; }

button,
a { -webkit-tap-highlight-color: transparent; }

button:focus-visible,
a:focus-visible,
textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 52%, transparent);
  outline-offset: 2px;
}

[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.gate {
  min-height: 100%;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 0.75rem;
  padding: 2rem;
  text-align: center;
}

.gate-mark {
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  border-radius: 0.55rem;
  background: #17201d;
  color: #fafbf8;
  font: 700 2rem/1 var(--mono);
}

.gate p { margin: 0; color: var(--muted); }

.gate a {
  color: var(--accent);
  font-weight: 650;
  text-underline-offset: 0.2em;
}

.editor-shell {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr;
}

.topbar {
  min-height: 4.6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.75rem 1.1rem;
  border-bottom: 1px solid var(--rule);
  background: var(--band);
}

.identity,
.save-cluster {
  display: flex;
  align-items: center;
}

.identity { gap: 0.85rem; min-width: 0; }
.save-cluster { gap: 0.85rem; flex: none; }

.back {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid var(--rule);
  border-radius: 50%;
  color: var(--text);
  text-decoration: none;
  font-size: 1.25rem;
}

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

.eyebrow {
  margin: 0 0 0.15rem;
  color: var(--faint);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

h1 {
  max-width: min(52vw, 46rem);
  margin: 0;
  overflow: hidden;
  font: 700 clamp(1rem, 1.7vw, 1.28rem)/1.2 var(--serif);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.save-state {
  color: var(--muted);
  font-size: 0.78rem;
}

.save-state[data-tone="error"] { color: #b63b3b; }
.save-state[data-tone="success"] { color: #2f7555; }

.primary {
  min-height: 2.55rem;
  padding: 0 1rem;
  border: 0;
  border-radius: 0.35rem;
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
  font-weight: 700;
}

.primary:disabled { cursor: wait; opacity: 0.62; }

.workspace {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.write-pane,
.preview-pane {
  min-width: 0;
  min-height: 0;
}

.write-pane {
  display: grid;
  grid-template-rows: auto 1fr auto;
  border-right: 1px solid var(--rule);
  background: var(--surface);
}

.toolbar {
  min-height: 3rem;
  display: flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.45rem 0.7rem;
  border-bottom: 1px solid var(--rule);
  color: var(--faint);
  font-size: 0.72rem;
}

.toolbar button {
  width: 2.25rem;
  height: 2.1rem;
  padding: 0;
  border: 0;
  border-radius: 0.3rem;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.toolbar button:hover { background: var(--band); color: var(--text); }
.toolbar-spacer { flex: 1; }

#markdown-input {
  width: 100%;
  height: 100%;
  min-height: 0;
  resize: none;
  border: 0;
  outline: 0;
  padding: clamp(1.25rem, 3vw, 2.5rem);
  background: var(--surface);
  color: var(--text);
  caret-color: var(--accent);
  font: 400 0.97rem/1.75 var(--mono);
  tab-size: 2;
}

.editor-hint {
  margin: 0;
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--rule);
  color: var(--faint);
  font-size: 0.7rem;
}

.preview-pane {
  overflow-y: auto;
  padding: clamp(1.6rem, 4vw, 3.5rem);
  background: var(--ground);
}

.preview-label {
  max-width: 42rem;
  margin: 0 auto 2rem;
  color: var(--faint);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.preview-prose {
  max-width: 42rem;
  margin-inline: auto;
  font: 400 1.08rem/1.72 var(--serif);
}

.preview-prose > * { margin-block: 0; }
.preview-prose > * + * { margin-top: 1.35em; }
.preview-prose > * + h2 { margin-top: 2.25em; }
.preview-prose > * + h3 { margin-top: 1.9em; }
.preview-prose > h2 + *,
.preview-prose > h3 + * { margin-top: 0.62em; }
.preview-prose h1 { white-space: normal; max-width: none; font-size: 2rem; }
.preview-prose h2 { font-size: 1.65rem; line-height: 1.25; }
.preview-prose h3 { font-size: 1.3rem; line-height: 1.3; }
.preview-prose a { color: var(--accent); text-underline-offset: 0.15em; }
.preview-prose img { display: block; max-width: 100%; height: auto; }
.preview-prose blockquote {
  padding-left: 1rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}
.preview-prose code {
  padding: 0.12em 0.28em;
  border-radius: 0.2rem;
  background: var(--band);
  font: 0.82em/1.4 var(--mono);
}
.preview-prose pre {
  overflow-x: auto;
  padding: 1rem;
  border: 1px solid var(--rule);
  border-radius: 0.35rem;
  background: var(--band);
}
.preview-prose pre code { padding: 0; background: transparent; }
.preview-prose table { width: 100%; border-collapse: collapse; font-family: var(--sans); font-size: 0.84em; }
.preview-prose th,
.preview-prose td { padding: 0.55rem; border: 1px solid var(--rule); text-align: left; }

.mobile-modes { display: none; }

@media (max-width: 760px) {
  .editor-shell { grid-template-rows: auto auto 1fr; }
  .topbar { min-height: 4.2rem; padding: 0.65rem 0.75rem; }
  .save-state { display: none; }
  .primary { min-height: 2.35rem; padding-inline: 0.75rem; font-size: 0.82rem; }
  h1 { max-width: 44vw; }
  .mobile-modes {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 0.35rem;
    border-bottom: 1px solid var(--rule);
    background: var(--band);
  }
  .mobile-modes button {
    min-height: 2.25rem;
    border: 0;
    border-radius: 0.3rem;
    color: var(--muted);
    background: transparent;
    font-weight: 650;
  }
  .mobile-modes button[aria-pressed="true"] { color: var(--text); background: var(--surface); }
  .workspace { display: block; }
  .workspace[data-active-mode="write"] .preview-pane,
  .workspace[data-active-mode="preview"] .write-pane { display: none; }
  .write-pane,
  .preview-pane { height: 100%; border-right: 0; }
  #markdown-input { padding: 1.15rem; font-size: 0.9rem; }
  .preview-pane { padding: 1.5rem 1.15rem 4rem; }
  .preview-prose { font-size: 1.03rem; }
}