/* Artifact Publisher — a quiet reading surface.
   Mobile (Telegram in-app browser) first; desktop is the progressive enhancement. */

:root {
  --bg: #fcfbf9;
  --bg-sunken: #f4f1ec;
  --ink: #1a1a18;
  --ink-muted: #6e6a63;
  --rule: #e3ded4;
  --rule-strong: #c9c2b4;
  --link: #2f5597;
  --danger: #9a2f2f;

  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-prose: Georgia, "Noto Serif", "Droid Serif", "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 40rem;
  --gutter: 1.25rem;
  --step: 1.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131311;
    --bg-sunken: #1c1b18;
    --ink: #e9e5dd;
    --ink-muted: #9b968c;
    --rule: #2e2c27;
    --rule-strong: #423f38;
    --link: #8fb0e8;
    --danger: #e08585;
  }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-prose);
  font-size: 1.0625rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

a { color: var(--link); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }

/* ---------- centred pages: login, errors, the pre-auth shell ---------- */

.page-centered { display: flex; min-height: 100svh; align-items: center; justify-content: center; }

.gate {
  width: 100%;
  max-width: 26rem;
  padding: calc(var(--gutter) * 2) var(--gutter) calc(var(--gutter) * 3);
}

.gate__eyebrow {
  margin: 0 0 1.25rem;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.gate__title {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.gate__hint { margin: 0 0 1.5rem; color: var(--ink-muted); font-size: 0.98rem; }

.gate__error {
  margin: 0 0 1.25rem;
  padding: 0.6rem 0.85rem;
  border-left: 3px solid var(--danger);
  background: var(--bg-sunken);
  color: var(--danger);
  font-family: var(--font-ui);
  font-size: 0.95rem;
}

.gate__form { display: grid; gap: 0.6rem; }

.gate__label {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.gate__input {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1rem; /* 16px keeps iOS from zooming on focus */
}

.gate__input:focus-visible { outline: 2px solid var(--link); outline-offset: 1px; }

.gate__button {
  margin-top: 0.4rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--ink);
  color: var(--bg);
  font-family: var(--font-ui);
  font-size: 1rem;
  cursor: pointer;
}

.gate__button:hover { background: transparent; color: var(--ink); }

/* ---------- document pages ---------- */

.layout {
  max-width: var(--measure);
  margin: 0 auto;
  padding: calc(var(--gutter) * 1.75) var(--gutter) calc(var(--gutter) * 4);
}

.masthead { margin-bottom: calc(var(--step) * 1.5); }

.masthead__eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.masthead__title {
  margin: 0;
  font-size: clamp(1.65rem, 5.5vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  font-weight: 700;
}

.masthead__summary {
  margin: 0.75rem 0 0;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
}

.actions__logout { margin: 0; margin-left: auto; }

.actions__item {
  display: inline-block;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 0.86rem;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
}

.actions__item:hover { border-color: var(--ink); }
.actions__item--quiet { border-color: transparent; color: var(--ink-muted); }
.actions__item--quiet:hover { color: var(--ink); border-color: var(--rule-strong); }

/* ---------- table of contents ---------- */

.toc {
  margin: 0 0 var(--step);
  padding: 0.75rem 0 1rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.9rem;
}

.toc[hidden] { display: none; }
.toc__list { margin: 0; padding: 0; list-style: none; }
.toc__item { margin: 0.15rem 0; }
.toc__item--l2 { padding-left: 0.9rem; }
.toc__item--l3 { padding-left: 1.8rem; }
.toc__item--l4 { padding-left: 2.7rem; }
.toc__link { color: var(--ink-muted); text-decoration: none; }
.toc__link:hover { color: var(--ink); text-decoration: underline; }
.toc__link[aria-current] { color: var(--ink); font-weight: 600; }

/* ---------- rendered markdown ---------- */

.doc > :first-child { margin-top: 0; }

.doc h1, .doc h2, .doc h3, .doc h4, .doc h5, .doc h6 {
  margin: calc(var(--step) * 1.4) 0 0.6rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
  scroll-margin-top: 1rem;
}

.doc h1 { font-size: 1.7rem; }
.doc h2 { font-size: 1.4rem; padding-bottom: 0.3rem; border-bottom: 1px solid var(--rule); }
.doc h3 { font-size: 1.18rem; }
.doc h4, .doc h5, .doc h6 { font-size: 1.02rem; }

.doc p, .doc ul, .doc ol, .doc dl { margin: 0 0 1.1rem; }
.doc li { margin: 0.3rem 0; }
.doc li > ul, .doc li > ol { margin: 0.3rem 0; }

.doc blockquote {
  margin: 0 0 1.1rem;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 2px solid var(--rule-strong);
  color: var(--ink-muted);
}

.doc hr { margin: var(--step) 0; border: 0; border-top: 1px solid var(--rule); }

.doc img { max-width: 100%; height: auto; }

.doc code {
  padding: 0.1em 0.35em;
  border-radius: 2px;
  background: var(--bg-sunken);
  font-family: var(--font-mono);
  font-size: 0.86em;
}

.doc .hl {
  margin: 0 0 1.1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--bg-sunken);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.doc .hl pre { margin: 0; }
.doc .hl code { padding: 0; background: none; font-size: 0.82rem; line-height: 1.55; }

.doc__table {
  margin: 0 0 1.1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--rule);
  border-radius: 2px;
}

.doc table { width: 100%; border-collapse: collapse; font-family: var(--font-ui); font-size: 0.9rem; }
.doc th, .doc td { padding: 0.55rem 0.75rem; text-align: left; border-bottom: 1px solid var(--rule); }
.doc th { background: var(--bg-sunken); font-weight: 600; white-space: nowrap; }
.doc tbody tr:last-child td { border-bottom: 0; }

.doc input[type="checkbox"] { margin-right: 0.4rem; accent-color: var(--ink-muted); }
.doc .task-list-item { list-style: none; margin-left: -1.4rem; }

.doc .mermaid {
  margin: 0 0 1.1rem;
  padding: 0.5rem;
  overflow-x: auto;
  text-align: center;
  font-family: var(--font-ui);
}

/* ---------- standalone html artifacts ---------- */

.embed {
  display: block;
  width: 100%;
  height: min(78svh, 900px);
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: #fff;
}

.colophon {
  margin-top: calc(var(--step) * 2);
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.82rem;
}

.colophon__link { color: var(--ink-muted); }

/* ---------- desktop ---------- */

@media (min-width: 64rem) {
  .layout {
    max-width: 62rem;
    display: grid;
    grid-template-columns: 1fr 15rem;
    grid-template-areas: "masthead masthead" "doc toc" "colophon colophon";
    column-gap: 3rem;
  }

  .masthead { grid-area: masthead; }
  .doc { grid-area: doc; max-width: var(--measure); }
  .colophon { grid-area: colophon; }

  .toc {
    grid-area: toc;
    position: sticky;
    top: 1.5rem;
    align-self: start;
    margin: 0;
    padding: 0 0 0 1.25rem;
    border-bottom: 0;
    border-left: 1px solid var(--rule);
  }

  .toc[hidden] { display: block; }       /* the toggle is a mobile affordance only */
  .actions__item--toc { display: none; }

  .layout--embed { grid-template-columns: 1fr; grid-template-areas: "masthead" "doc"; }
  .embed { height: min(82svh, 1100px); }
}

/* ---------- print / save as PDF ---------- */

@media print {
  :root { --bg: #fff; --bg-sunken: #fff; --ink: #000; --ink-muted: #444; --rule: #bbb; }
  .actions, .toc, .colophon { display: none !important; }
  body { font-size: 11pt; }
  .layout { max-width: none; display: block; padding: 0; }
  .doc .hl, .doc__table, .doc blockquote, .doc .mermaid { break-inside: avoid; }
  .doc h1, .doc h2, .doc h3 { break-after: avoid; }
  .doc a { color: #000; }
  .doc a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.85em; color: #555; }
  .embed { height: 60vh; border: 1px solid #bbb; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}