/* pai.ink — editorial style sheet
   Monochrome paper-and-ink palette; green is reserved for the cursor and
   "verified" status. No external font CDN (works in CN without proxy delays). */

:root {
  --bg: #f3ebd5;            /* warm paper (WSJ-print inspired) */
  --bg-elev: #faf3df;       /* slightly lighter for cards / pre */
  --fg: #14130f;            /* true ink */
  --muted: #65605a;         /* warm gray for meta text */
  --hairline: #c9c0a8;      /* paper-texture lines */
  --rule: #14130f;          /* heavy section rules — same as ink */
  --green: #2d5d4a;         /* used only for verified state pill */
  --green-soft: rgba(45, 93, 74, 0.55);

  --cursor-rest: rgba(20, 19, 15, 0.55);   /* dim ink dot — quiet "I'm here" */
  --cursor-hover: rgba(0, 200, 83, 0.78);  /* vivid apple-green — loud "click me" */

  --serif: 'Source Serif 4', 'Source Serif Pro', 'Iowan Old Style', Charter, 'Songti SC', 'STSong', Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Helvetica Neue', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --mono: ui-monospace, SFMono-Regular, 'JetBrains Mono', Menlo, Consolas, monospace;

  --w: 720px;
  --pad: 24px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14130f;
    --bg-elev: #1a1814;
    --fg: #ede4cc;
    --muted: #8d877a;
    --hairline: #2e2a22;
    --rule: #ede4cc;
    --green: #5fa385;
    --green-soft: rgba(95, 163, 133, 0.55);

    --cursor-rest: rgba(237, 228, 204, 0.55);  /* dim cream */
    --cursor-hover: rgba(0, 200, 83, 0.85);    /* same apple-green, slightly stronger on dark */
  }
}

* { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: var(--w);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* ---------- masthead ---------- */
.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 36px 0 28px;
  border-bottom: 1px solid var(--hairline);
}
.masthead .brand {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.015em;
}
.masthead .brand a { color: var(--fg); text-decoration: none; }
.masthead nav { display: flex; gap: 24px; }
.masthead nav a {
  color: var(--fg);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.masthead nav a:hover,
.masthead nav a[aria-current="page"] {
  border-bottom-color: var(--fg);
}

/* ---------- hero ---------- */
.hero { padding: 72px 0 40px; }
.hero h1 {
  font-family: var(--serif);
  font-size: 44px;
  line-height: 1.1;
  font-weight: 600;
  margin: 0 0 22px;
  letter-spacing: -0.02em;
}
.hero p {
  font-size: 17px;
  color: var(--muted);
  max-width: 540px;
  margin: 0;
  line-height: 1.6;
}
.hero code {
  font-family: var(--mono);
  font-size: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1px 6px;
  border-radius: 2px;
}
@media (max-width: 480px) {
  .hero { padding: 40px 0 24px; }
  .hero h1 { font-size: 32px; }
}

/* ---------- zone feed (landing) — newspaper section breaks ---------- */
.zone {
  padding-top: 28px;
  margin-top: 56px;
  border-top: 6px solid var(--rule);
}
.zone:first-of-type { margin-top: 24px; }
.zone-roman {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.35em;
  color: var(--muted);
  text-transform: uppercase;
  margin: 0 0 10px;
}
.zone-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
}
.zone-head h2 {
  font-family: var(--serif);
  font-size: 38px;
  line-height: 1.05;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}
.zone-head .more {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg);
  text-decoration: none;
  border: 1px solid var(--fg);
  padding: 7px 14px;
  white-space: nowrap;
  transition: background 120ms ease, color 120ms ease;
}
.zone-head .more:hover {
  background: var(--fg);
  color: var(--bg);
}
@media (max-width: 480px) {
  .zone-head h2 { font-size: 28px; }
  .zone-head { flex-direction: column; align-items: flex-start; gap: 14px; }
}

/* ---------- article list ---------- */
.articles { list-style: none; padding: 0; margin: 0; }
.articles li { border-top: 1px solid var(--hairline); }
.articles li:first-child { border-top: none; }

.article-link {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 26px 0;
  transition: padding-left 140ms ease;
}
.article-link:hover { padding-left: 8px; }
.article-link h3 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
  line-height: 1.3;
}
.article-link .dek {
  color: var(--muted);
  font-size: 15.5px;
  margin: 0 0 12px;
  line-height: 1.55;
}
.article-link .meta {
  color: var(--muted);
  font-size: 13px;
  margin: 0;
  letter-spacing: 0.01em;
  font-feature-settings: "tnum";
}
.article-link .meta .sep { margin: 0 8px; opacity: 0.5; }
.article-row {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}
.article-row .article-link { flex: 1; }
.article-side {
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding-top: 30px;
  white-space: nowrap;
}
.article-side .side-link {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
}
.article-side .side-link:hover { color: var(--fg); }
@media (max-width: 480px) {
  .article-row { flex-direction: column; gap: 8px; }
  .article-side { flex-direction: row; padding-top: 0; gap: 16px; }
}

/* ---------- zone listing page ---------- */
.page-head {
  padding: 56px 0 36px;
  border-bottom: 6px solid var(--rule);
}
.page-head .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.35em;
  color: var(--muted);
  margin: 0 0 10px;
}
.page-head h1 {
  font-family: var(--serif);
  font-size: 42px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.02em;
  line-height: 1.05;
}
.page-head .lede {
  color: var(--muted);
  font-size: 16.5px;
  margin: 18px 0 0;
  max-width: 540px;
  line-height: 1.6;
}

.empty {
  color: var(--muted);
  font-size: 15px;
  padding: 56px 0;
  font-style: italic;
}

/* ---------- verify page ---------- */
.verify-head {
  padding: 56px 0 30px;
  border-bottom: 1px solid var(--hairline);
}
.verify-head .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.35em;
  color: var(--muted);
  margin: 0 0 14px;
}
.verify-head .status {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}
.verify-head .status.ok::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--green);
  margin-right: 14px;
  vertical-align: middle;
}
.verify-head .status.warn::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: transparent;
  border: 2px solid var(--muted);
  margin-right: 14px;
  vertical-align: middle;
}
.verify-head .sub {
  color: var(--muted);
  font-size: 15px;
  margin: 14px 0 0;
}

dl.manifest {
  margin: 36px 0;
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 14px 24px;
  font-size: 14px;
}
dl.manifest dt {
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}
dl.manifest dd {
  margin: 0;
  word-break: break-all;
}
dl.manifest dd code {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--fg);
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1px 6px;
  border-radius: 2px;
}
dl.manifest dd a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--hairline);
  text-underline-offset: 3px;
}
dl.manifest dd a:hover { text-decoration-color: var(--fg); }

details.raw {
  border-top: 1px solid var(--hairline);
  padding-top: 28px;
  margin-top: 36px;
}
details.raw summary {
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  list-style: none;
}
details.raw summary::-webkit-details-marker { display: none; }
details.raw summary::after { content: " ↓"; }
details.raw[open] summary::after { content: " ↑"; }
details.raw pre {
  margin: 18px 0 0;
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.5;
  overflow-x: auto;
}

/* ---------- about page ---------- */
.prose { padding: 36px 0 56px; }
.prose h2 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
  margin: 44px 0 14px;
  letter-spacing: -0.01em;
}
.prose h2:first-child { margin-top: 16px; }
.prose p { margin: 0 0 16px; font-size: 16.5px; line-height: 1.65; }
.prose ol, .prose ul { padding-left: 22px; margin: 0 0 16px; }
.prose li { margin-bottom: 8px; }
.prose code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1px 6px;
  border-radius: 2px;
}
.prose a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--hairline);
  text-underline-offset: 3px;
}
.prose a:hover { text-decoration-color: var(--fg); }

/* ---------- footer ---------- */
footer.site {
  margin-top: 96px;
  padding: 32px 0 48px;
  border-top: 6px solid var(--rule);
  color: var(--muted);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  letter-spacing: 0.02em;
}
footer.site a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
footer.site a:hover { color: var(--fg); border-bottom-color: var(--fg); }

/* ============================================================
   Custom cursor — hidden on touch / reduced-motion devices.
   White (mix-blend difference, auto-visible on any bg) becomes
   semi-transparent green when hovering anything clickable.
   ============================================================ */
@media (pointer: fine) {
  html, body, a, button, summary, [role="button"], input, textarea, label {
    cursor: none;
  }
}
.cursor {
  position: fixed;
  top: 0;
  left: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cursor-rest);
  pointer-events: none;
  z-index: 9999;
  transform: translate3d(0, 0, 0) translate(-50%, -50%);
  transition:
    width 160ms cubic-bezier(.2, .7, .3, 1),
    height 160ms cubic-bezier(.2, .7, .3, 1),
    background 180ms ease,
    opacity 120ms ease;
  will-change: transform;
}
.cursor.hovering {
  width: 60px;
  height: 60px;
  background: var(--cursor-hover);
}
.cursor.hidden { opacity: 0; }

@media (pointer: coarse), (prefers-reduced-motion: reduce) {
  .cursor { display: none; }
  html, body, a, button, summary, [role="button"], input, textarea, label {
    cursor: auto;
  }
  a, button, summary, [role="button"] { cursor: pointer; }
}

/* ============================================================
   Agreement page
   ============================================================ */
.agreement-archived {
  margin: 32px 0 0;
  padding: 14px 18px;
  background: rgba(184, 132, 42, 0.08);
  border-left: 3px solid #b8842a;
  font-size: 14px;
}
.agreement-archived p { margin: 0; }
.agreement-hash {
  margin: 32px 0 8px;
  padding: 20px 22px;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--green);
}
.agreement-hash .eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
}
.agreement-hash p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.6;
}
.agreement-hash p:last-child { margin-bottom: 0; }
.agreement-hash code {
  font-family: var(--mono);
  font-size: 12.5px;
  background: var(--bg);
  border: 1px solid var(--hairline);
  padding: 1px 6px;
  border-radius: 2px;
  word-break: break-all;
}
.agreement-hash .agreement-verify code {
  display: inline-block;
  padding: 4px 10px;
  font-size: 12px;
}
.agreement-body h1 {
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 600;
  margin: 36px 0 18px;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.agreement-body h2 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  margin: 40px 0 12px;
  letter-spacing: -0.01em;
}
.agreement-body h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  margin: 28px 0 10px;
}
.agreement-body blockquote {
  margin: 16px 0;
  padding: 12px 18px;
  border-left: 3px solid var(--hairline);
  color: var(--muted);
  background: var(--bg-elev);
}
.agreement-body blockquote p { margin: 0; }
.agreement-body hr {
  border: 0;
  border-top: 1px solid var(--hairline);
  margin: 32px 0;
}

/* ---------- submit form ---------- */
.submit-form { display: flex; flex-direction: column; gap: 24px; margin: 24px 0; }
.submit-form fieldset {
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 20px 24px 24px;
  background: var(--bg-elev);
}
.submit-form legend {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.05em;
  padding: 0 8px;
  color: var(--fg);
}
.submit-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.92em;
  color: var(--muted);
  margin-bottom: 16px;
}
.submit-form label:last-child { margin-bottom: 0; }
.submit-form .hint {
  font-size: 0.85em;
  color: var(--muted);
  font-weight: normal;
  margin-left: 6px;
}
.submit-form input[type="text"],
.submit-form input[type="url"],
.submit-form input[type="password"],
.submit-form input[type="file"],
.submit-form select {
  font: inherit;
  font-family: var(--sans);
  padding: 8px 10px;
  border: 1px solid var(--hairline);
  border-radius: 3px;
  background: var(--bg);
  color: var(--fg);
}
.submit-form input:focus,
.submit-form select:focus {
  outline: 2px solid var(--green);
  outline-offset: 1px;
  border-color: var(--green);
}
.submit-form input:invalid:not(:placeholder-shown) {
  border-color: #c54;
}
.submit-form .checkbox-row {
  flex-direction: row;
  align-items: flex-start;
  gap: 10px;
  color: var(--fg);
  font-size: 0.95em;
  line-height: 1.55;
}
.submit-form .checkbox-row input { margin-top: 4px; }
.submit-form button[type="submit"] {
  align-self: flex-start;
  font: inherit;
  font-family: var(--sans);
  font-weight: 600;
  padding: 10px 24px;
  background: var(--fg);
  color: var(--bg);
  border: none;
  border-radius: 3px;
  cursor: pointer;
}
.submit-form button[type="submit"]:hover { opacity: 0.85; }
.submit-form button[type="submit"]:disabled { opacity: 0.5; cursor: wait; }

.warn-box {
  border-left: 4px solid #b8842a;
  background: rgba(184, 132, 42, 0.08);
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 0.9em;
  color: var(--fg);
}
.warn-box strong { color: #b8842a; }
.warn-box p { margin: 8px 0; }
.warn-box ol { margin: 8px 0 8px 20px; }
.warn-box code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg);
  padding: 1px 4px;
  border-radius: 2px;
}

.result {
  margin: 24px 0;
  padding: 16px 20px;
  border-radius: 4px;
  border-left: 4px solid var(--hairline);
  background: var(--bg-elev);
}
.result-ok { border-left-color: var(--green); }
.result-err { border-left-color: #c54; }
.result p { margin: 6px 0; }
.result code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg);
  padding: 1px 4px;
  border-radius: 2px;
}

.agent-howto {
  margin: 32px 0;
  padding: 16px 20px;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  background: var(--bg-elev);
}
.agent-howto summary {
  cursor: pointer;
  font-weight: 600;
  font-family: var(--serif);
}
.agent-howto pre {
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8em;
  background: var(--bg);
  padding: 12px;
  border-radius: 3px;
  border: 1px solid var(--hairline);
}