:root {
  --bg: #f2f4f5;
  --surface: #ffffff;
  --surface-rail: #eceef0;
  --ink: #191d21;
  --ink-muted: #57626c;
  --ink-faint: #879098;
  --accent: #c31432;
  --accent-ink: #ffffff;
  --accent-soft: #fbe8ea;
  --line: #dde1e4;
  --line-strong: #c7cdd2;
  --ok: #1b7a4a;
  --shadow: 0 1px 2px rgba(20,24,28,0.04), 0 8px 24px -12px rgba(20,24,28,0.10);
  --font-display: "Archivo", "Arial Black", sans-serif;
  --font-body: "Plus Jakarta Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171a;
    --surface: #1b1f23;
    --surface-rail: #191d21;
    --ink: #e9ebed;
    --ink-muted: #9aa4ac;
    --ink-faint: #6c7680;
    --accent: #ff5f74;
    --accent-ink: #1a0508;
    --accent-soft: #351218;
    --line: #2a3035;
    --line-strong: #3a4147;
    --ok: #4fbf85;
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px -12px rgba(0,0,0,0.5);
  }
}
:root[data-theme="dark"] {
  --bg: #14171a;
  --surface: #1b1f23;
  --surface-rail: #191d21;
  --ink: #e9ebed;
  --ink-muted: #9aa4ac;
  --ink-faint: #6c7680;
  --accent: #ff5f74;
  --accent-ink: #1a0508;
  --accent-soft: #351218;
  --line: #2a3035;
  --line-strong: #3a4147;
  --ok: #4fbf85;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px -12px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }
::selection { background: var(--accent-soft); color: var(--ink); }

html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  margin: 0;
  padding: 0;
}
body {
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1.5px; text-underline-offset: 2px; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.shell { max-width: 1180px; margin: 0 auto; padding: 0 24px; }

.topstrip { background: var(--surface-rail); border-bottom: 1px solid var(--line); }
.topstrip-inner {
  max-width: 1180px; margin: 0 auto; padding: 10px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint); letter-spacing: 0.02em;
}
.topstrip-inner strong { color: var(--ink-muted); font-weight: 500; }
.topstrip a { color: inherit; text-decoration: none; }
.topstrip a:hover { color: var(--ink); }

header.doc-head { padding: 56px 0 40px; border-bottom: 1px solid var(--line); }
.mark-row { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
.mark {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--accent); color: var(--accent-ink);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 900; font-size: 19px;
  flex-shrink: 0; box-shadow: var(--shadow);
}
.mark-name { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.04em; color: var(--ink-muted); text-transform: uppercase; }
h1.doc-title {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(32px, 4.6vw, 50px); line-height: 1.06; letter-spacing: -0.015em;
  margin: 0 0 14px; text-wrap: balance; max-width: 20ch;
}
.doc-sub { font-size: 17px; color: var(--ink-muted); max-width: 60ch; margin: 0; }

.meta-strip { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 28px; }
.meta-item { font-family: var(--font-mono); }
.meta-item dt { font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.06em; margin: 0 0 4px; }
.meta-item dd { margin: 0; font-size: 13.5px; color: var(--ink); font-weight: 500; }

.doc-body { display: grid; grid-template-columns: 240px minmax(0,1fr); gap: 64px; padding: 48px 0 96px; align-items: start; }
nav.toc { position: sticky; top: 24px; }
.toc-label { font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 14px; }
.toc ol { list-style: none; margin: 0 0 28px; padding: 0; border-left: 1px solid var(--line); }
.toc li { margin: 0; }
.toc a { display: block; padding: 7px 0 7px 16px; margin-left: -1px; border-left: 2px solid transparent; font-size: 13.5px; color: var(--ink-muted); text-decoration: none; font-weight: 500; }
.toc a:hover { color: var(--ink); border-left-color: var(--line-strong); }
.toc a .n { font-family: var(--font-mono); color: var(--ink-faint); margin-right: 8px; font-size: 12px; }

.rights-cta { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px; box-shadow: var(--shadow); }
.rights-cta p { margin: 0 0 12px; font-size: 13px; color: var(--ink-muted); line-height: 1.55; }
.rights-cta a.email, a.email {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 500;
  background: var(--accent-soft); color: var(--accent);
  padding: 8px 12px; border-radius: 8px; text-decoration: none; word-break: break-all;
}

main.content { min-width: 0; }
.lede { font-size: 18px; line-height: 1.65; color: var(--ink); max-width: 66ch; margin: 0 0 40px; }

.glance { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 28px 28px 8px; margin: 0 0 56px; box-shadow: var(--shadow); }
.glance h2 { font-family: var(--font-display); font-size: 13px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-muted); margin: 0 0 18px; }
.glance-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px 24px; margin-bottom: 20px; }
.glance-item { display: flex; gap: 12px; }
.glance-icon { width: 34px; height: 34px; border-radius: 9px; background: var(--surface-rail); border: 1px solid var(--line); display: flex; align-items: center; justify-content: center; font-size: 16px; flex-shrink: 0; }
.glance-item h3 { font-size: 13.5px; font-weight: 700; margin: 3px 0 3px; }
.glance-item p { font-size: 12.5px; color: var(--ink-muted); margin: 0; line-height: 1.5; }

section.doc-section { padding: 40px 0; border-top: 1px solid var(--line); scroll-margin-top: 24px; max-width: 68ch; }
section.doc-section:first-of-type { border-top: none; padding-top: 0; }
.sec-head { display: flex; align-items: baseline; gap: 14px; margin: 0 0 16px; }
.sec-num { font-family: var(--font-mono); font-size: 14px; color: var(--accent); font-weight: 600; flex-shrink: 0; }
h2.sec-title { font-family: var(--font-display); font-weight: 700; font-size: 22px; letter-spacing: -0.005em; margin: 0; text-wrap: balance; }

.doc-section p { margin: 0 0 14px; color: var(--ink); }
.doc-section p.muted { color: var(--ink-muted); font-size: 14.5px; }
.doc-section ul, .doc-section ol.plain { margin: 0 0 14px; padding-left: 22px; }
.doc-section li { margin-bottom: 8px; }
.doc-section li::marker { color: var(--ink-faint); }
.doc-section strong { font-weight: 700; }

table.datatable { width: 100%; border-collapse: collapse; margin: 4px 0 20px; font-size: 14px; }
.table-wrap { overflow-x: auto; margin: 0 0 20px; border: 1px solid var(--line); border-radius: 12px; }
.table-wrap table { margin: 0; border: none; border-radius: 0; }
table.datatable th {
  text-align: left; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--ink-faint); font-weight: 500; padding: 12px 16px; background: var(--surface-rail);
  border-bottom: 1px solid var(--line); white-space: nowrap;
}
table.datatable td { padding: 13px 16px; border-bottom: 1px solid var(--line); color: var(--ink); vertical-align: top; }
table.datatable tr:last-child td { border-bottom: none; }
table.datatable td.muted { color: var(--ink-muted); }
.tag { display: inline-block; font-family: var(--font-mono); font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 500; white-space: nowrap; }
.tag.ok { background: rgba(27,122,74,0.12); color: var(--ok); }

.callout {
  border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--surface);
  border-radius: 0 12px 12px 0; padding: 16px 20px; margin: 0 0 20px; font-size: 14.5px; color: var(--ink-muted); box-shadow: var(--shadow);
}
.callout strong { color: var(--ink); }

.perm-list { display: grid; gap: 12px; margin: 0 0 20px; padding: 0; list-style: none; }
.perm-list li { display: grid; grid-template-columns: 130px 1fr; gap: 16px; align-items: start; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; }
.perm-list code { font-family: var(--font-mono); font-size: 12px; color: var(--accent); font-weight: 500; }
.perm-list p { margin: 0; font-size: 13.5px; color: var(--ink-muted); }

footer.doc-foot { border-top: 1px solid var(--line); padding: 36px 0 64px; display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
footer.doc-foot p { font-size: 13px; color: var(--ink-faint); margin: 0; font-family: var(--font-mono); }
.back-top, .back-link {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-muted); text-decoration: none;
  border: 1px solid var(--line); padding: 8px 14px; border-radius: 999px;
}
.back-top:hover, .back-link:hover { border-color: var(--line-strong); color: var(--ink); }

/* ---------- landing / index hub ---------- */
.hub-main { padding: 56px 0 96px; }
.hub-intro { max-width: 66ch; font-size: 18px; color: var(--ink-muted); margin: 0 0 48px; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; margin: 0 0 56px; }
.app-card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 24px; box-shadow: var(--shadow); }
.app-card h2 { font-family: var(--font-display); font-size: 19px; font-weight: 700; margin: 0 0 6px; }
.app-card p.app-desc { font-size: 13.5px; color: var(--ink-muted); margin: 0 0 18px; line-height: 1.55; }
.app-links { display: flex; gap: 10px; flex-wrap: wrap; }
.app-links a {
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 500;
  color: var(--ink); background: var(--surface-rail); border: 1px solid var(--line);
  padding: 7px 12px; border-radius: 8px; text-decoration: none;
}
.app-links a:hover { border-color: var(--line-strong); }
.hub-section-label { font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; margin: 0 0 18px; }

@media (max-width: 880px) {
  .doc-body { grid-template-columns: 1fr; gap: 32px; padding-top: 32px; }
  nav.toc { position: static; }
  .toc ol { columns: 2; gap: 0 24px; }
  .glance-grid { grid-template-columns: 1fr 1fr; }
  .perm-list li { grid-template-columns: 1fr; gap: 4px; }
}
@media (max-width: 560px) {
  .glance-grid { grid-template-columns: 1fr; }
  .meta-strip { gap: 18px 28px; }
  .shell { padding: 0 18px; }
}
@media (prefers-reduced-motion: no-preference) {
  a, .back-top, .back-link { transition: color 0.15s ease, border-color 0.15s ease; }
}