/* duv0-x.cloud design system: ia-kb/references/duv0-x-design-system.md */
:root {
  --bg: #0A0A0B;
  --surface: #121214;
  --surface-2: #1C1B1C;
  --line: #2A2A2E;
  --line-strong: #444748;
  --text: #EDEDED;
  --subtle: #A1A1AA;
  --muted: #71717A;
  --faint: #52525B;
  --radius: 4px;
  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Geist", system-ui, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-serif: "Newsreader", Georgia, "Times New Roman", serif;
  --shell: 56rem;
  --measure: 46rem;
  --gutter: 1.5rem;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  background: var(--bg); color: var(--text);
  font-family: var(--font-body); font-size: 1rem; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--line); color: #fff; }
a { color: inherit; }
code { font-family: var(--font-mono); font-size: .9em; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius); padding: .05em .35em; color: var(--text); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.wrap { width: 100%; max-width: var(--shell); margin: 0 auto; padding: 0 var(--gutter); }
.mono { font-family: var(--font-mono); }
.muted { color: var(--muted); }
.faint { color: var(--faint); }

/* shell: same as blog.duv0-x.cloud */
.nav {
  position: sticky; top: 0; z-index: 10;
  border-bottom: 1px solid rgba(42, 42, 46, .6);
  background: rgba(10, 10, 11, .8);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}
.nav-inner { height: 3.5rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.wordmark { font-family: var(--font-mono); font-size: .75rem; letter-spacing: -.01em; text-decoration: none; white-space: nowrap; }
.wordmark:hover { color: #fff; }
.cursor { font-weight: 700; animation: blink 1s step-start infinite; }
@keyframes blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
.nav-links { display: flex; gap: 1.25rem; font-family: var(--font-mono); font-size: .75rem; text-transform: lowercase; }
.nav-links a { color: var(--muted); text-decoration: none; transition: color .15s; }
.nav-links a:hover { color: var(--text); }

.main { flex: 1; padding-top: 2rem; padding-bottom: 4rem; }
.footer { border-top: 1px solid var(--line); }
.footer-inner { min-height: 3.5rem; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem; font-family: var(--font-mono); font-size: .75rem; color: var(--faint); }

.prompt { font-size: .75rem; color: var(--muted); letter-spacing: .02em; margin: 0 0 .75rem; display: flex; align-items: center; gap: .5rem; }
.display {
  max-width: var(--measure); font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.75rem, 4vw + .5rem, 2.5rem); line-height: 1.15; letter-spacing: -.02em; margin: 0 0 1rem;
}
.lead { color: var(--subtle); font-size: 1.0625rem; margin: 0 0 2rem; max-width: var(--measure); }

/* controls */
.btn {
  display: inline-flex; align-items: center; gap: .4rem; white-space: nowrap;
  font-family: var(--font-mono); font-size: .8125rem; text-decoration: none;
  padding: .55rem 1.1rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--surface); color: var(--text); cursor: pointer; transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--line-strong); }
.btn-primary { background: var(--text); color: var(--bg); border-color: var(--text); }
.btn-primary:hover { background: #fff; }
.btn:disabled, .btn-busy { opacity: .7; cursor: progress; }
.btn-primary:disabled { background: var(--surface-2); color: var(--text); border-color: var(--line-strong); }
.tag { font-family: var(--font-mono); font-size: .6875rem; padding: .1rem .45rem; border: 1px solid var(--line-strong); border-radius: var(--radius); color: var(--text); background: var(--surface-2); }
.badge { font-family: var(--font-mono); font-size: .75rem; padding: .2rem .55rem; border: 1px solid var(--line); border-radius: var(--radius); color: var(--muted); margin-left: auto; }
.badge[data-state="ok"] { color: var(--text); }
.dot { display: inline-block; width: .45rem; height: .45rem; border-radius: 50%; background: currentColor; animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .25; } }

/* form */
.searchbox {
  display: flex; align-items: center; gap: .75rem;
  padding: .5rem .5rem .5rem 1.1rem; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius); transition: border-color .15s;
}
.searchbox:focus-within { border-color: var(--line-strong); }
.searchbox input {
  flex: 1; min-width: 0; background: none; border: 0; outline: none; color: var(--text);
  font-family: var(--font-mono); font-size: .875rem; padding: .5rem 0;
}
.searchbox input::placeholder, .dest input::placeholder { color: var(--faint); }
.searchbox-ro { font-size: .875rem; margin-top: 1.5rem; }
.ro-url { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.send-row { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1.5rem; margin: .75rem 0 0; font-family: var(--font-mono); font-size: .75rem; color: var(--muted); }
.dest { display: flex; align-items: center; gap: .5rem; padding: .3rem .6rem; border: 1px solid var(--line); border-radius: var(--radius); }
.dest:focus-within { border-color: var(--line-strong); }
.dest input { background: none; border: 0; outline: none; color: var(--text); font: inherit; width: 14rem; max-width: 52vw; }
.check { display: flex; align-items: center; gap: .5rem; cursor: pointer; }
.check input { accent-color: var(--text); margin: 0; }
.cf-turnstile { margin-top: .75rem; }
.form-error { min-height: 1.2em; margin: .75rem 0 0; font-size: .8125rem; color: var(--text); }
.form-error:not(:empty)::before { content: "! "; color: var(--muted); }
.steps { list-style: none; display: flex; flex-wrap: wrap; gap: .75rem 1.25rem; margin: 5rem 0 0; padding: 1.75rem 0 0; border-top: 1px solid var(--line); font-size: .75rem; color: var(--muted); }
.steps b { color: var(--text); font-weight: 500; }

/* progress */
.panel { margin-top: 2rem; padding: 1.5rem; background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); }
.panel-tight { margin-top: 1.5rem; padding: 1rem 1.25rem; font-size: .8125rem; }
.panel-head { display: flex; align-items: center; gap: .75rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); font-size: .8125rem; }
.rotativa {
  margin: 1.25rem 0; padding: 1rem; overflow: hidden; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  font-family: var(--font-mono); font-size: .6875rem; line-height: 1.35; color: var(--subtle);
}
.ribbon { display: block; margin-top: .5rem; color: var(--faint); white-space: pre; }
.meter { padding: 1rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); font-size: .75rem; }
.meter-row { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.meter-bar { margin-top: .5rem; color: var(--text); white-space: nowrap; overflow: hidden; }
.stages { list-style: none; margin: 1.25rem 0 0; padding: 0; font-size: .8125rem; }
.stage { display: grid; grid-template-columns: 1rem 1.75rem 1fr auto; gap: .5rem; padding: .4rem .5rem; border-left: 1px solid transparent; }
.stage.is-pending { color: var(--faint); }
.stage.is-ok .stage-status { color: var(--muted); }
.stage.is-running { background: var(--surface); border-left-color: var(--text); font-weight: 500; }
.stage-status { text-align: right; }
.panel-foot { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--line); font-size: .75rem; color: var(--muted); }
.panel-foot b { color: var(--text); font-weight: 500; }
.sent-to { margin: .9rem 0 0; padding-top: .9rem; border-top: 1px solid var(--line-strong); }

/* front page preview: the EPUB's look, in the browser */
.section-label { margin: 2.5rem 0 .75rem; font-size: .6875rem; letter-spacing: .08em; text-transform: uppercase; }
.paper { padding: 2rem clamp(1.25rem, 4vw, 2.5rem); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.paper-top { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font-size: .6875rem; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); padding-bottom: .5rem; border-bottom: 1px solid var(--line-strong); }
.masthead { margin: .75rem 0 .5rem; text-align: center; font-family: var(--font-serif); font-weight: 600; font-size: clamp(2.25rem, 7vw, 3.5rem); line-height: 1; letter-spacing: -.01em; text-transform: uppercase; }
.paper-rule { border-top: 1px solid var(--text); border-bottom: 1px solid var(--text); height: 4px; margin-bottom: 1.75rem; }
.paper-title { margin: 0 auto .75rem; max-width: 40rem; text-align: center; font-family: var(--font-serif); font-weight: 600; font-size: clamp(1.5rem, 3.5vw, 2rem); line-height: 1.2; }
.paper-dek { margin: 0 auto 1rem; max-width: 36rem; text-align: center; font-family: var(--font-serif); font-style: italic; font-size: 1.125rem; color: var(--subtle); }
.paper-meta { margin: 0 auto 1.5rem; padding-top: .75rem; max-width: 36rem; text-align: center; border-top: 1px solid var(--line-strong); font-size: .6875rem; color: var(--muted); }
.paper-body { columns: 2 18rem; column-gap: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--line-strong); font-family: var(--font-serif); font-size: 1.0625rem; line-height: 1.6; color: #D4D4D8; text-align: justify; hyphens: auto; }
.paper-body p { margin: 0 0 1em; }
.paper-body p:first-child::first-letter { float: left; font-size: 3.2em; line-height: .85; padding: .05em .1em 0 0; font-weight: 600; color: var(--text); }
.paper-foot { margin: .5rem 0 0; padding-top: .75rem; border-top: 1px solid var(--line); font-size: .6875rem; }

.setup { margin-top: 2rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.setup summary { padding: .875rem 1.25rem; font-size: .75rem; color: var(--subtle); cursor: pointer; list-style: none; }
.setup summary::-webkit-details-marker { display: none; }
.setup summary::after { content: "+"; float: right; color: var(--muted); }
.setup[open] summary::after { content: "−"; }
.setup[open] summary { border-bottom: 1px solid var(--line); }
.setup summary:hover { color: var(--text); }
.setup-body { padding: 1rem 1.25rem 1.25rem; font-size: .875rem; color: var(--subtle); max-width: var(--measure); }
.setup-body p { margin: 0 0 1rem; }
.setup-body b { color: var(--text); font-weight: 500; }
.setup-body a { color: var(--text); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: var(--line-strong); }
.setup-steps { margin: 0; padding-left: 1.25rem; display: grid; gap: .75rem; }
.setup-steps li::marker { font-family: var(--font-mono); color: var(--muted); }
.copy { display: inline-flex; align-items: center; gap: .5rem; margin-top: .375rem; padding: .25rem .25rem .25rem .625rem; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--bg); }
.copy code { color: var(--text); font-size: .8125rem; }
.btn-small { padding: .2rem .6rem; font-size: .6875rem; }

.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.note { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--line); font-size: .75rem; color: var(--muted); max-width: var(--measure); }

@media (min-width: 640px) {
  .wordmark { font-size: .875rem; }
  .nav-links { gap: 1.5rem; }
  .main { padding-top: 3.5rem; }
}
@media (max-width: 560px) {
  .searchbox { flex-wrap: wrap; padding: .5rem; }
  .searchbox input { flex-basis: 100%; padding: .5rem; }
  .searchbox .btn { width: 100%; justify-content: center; }
  .stage { grid-template-columns: 1rem 1.75rem 1fr; }
  .stage-status { grid-column: 3; text-align: left; }
  .rotativa { font-size: .5rem; }
  .badge { margin-left: 0; }
}
@media (max-width: 380px) {
  .nav-links a[href*="github"] { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .cursor, .dot { animation: none; }
}