@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,600;8..60,700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@500&display=swap');

:root {
  --paper: #FAFAF7;
  --paper-raised: #FFFFFF;
  --ink: #1C1E22;
  --ink-soft: #3C4048;
  --muted: #5B6270;
  --faint: #8A8F99;
  --accent: #1E3A6E;
  --accent-soft: #EAEFF6;
  --hairline: #DEDCD4;
  --hairline-strong: #C9C6BA;
  --tag-bg: #EFEEE7;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14161A;
    --paper-raised: #1B1E23;
    --ink: #EDEEEF;
    --ink-soft: #C9CBD1;
    --muted: #9498A2;
    --faint: #6B6F79;
    --accent: #7FA1DE;
    --accent-soft: #1E2A3C;
    --hairline: #2A2D33;
    --hairline-strong: #383B42;
    --tag-bg: #21242A;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper: #14161A;
  --paper-raised: #1B1E23;
  --ink: #EDEEEF;
  --ink-soft: #C9CBD1;
  --muted: #9498A2;
  --faint: #6B6F79;
  --accent: #7FA1DE;
  --accent-soft: #1E2A3C;
  --hairline: #2A2D33;
  --hairline-strong: #383B42;
  --tag-bg: #21242A;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  padding-inline: 16px;
  padding-block: 28px;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid currentColor; }
a:hover { opacity: 0.8; }

.shell {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 40px;
}

@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; gap: 20px; }
}

/* ---------- Masthead ---------- */
.masthead {
  grid-column: 1 / -1;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.masthead-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 700;
  font-size: 26px;
  letter-spacing: -0.01em;
}

.masthead-meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--faint);
  text-align: right;
}

/* ---------- Side nav ---------- */
nav.toc {
  position: sticky;
  top: 28px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

@media (max-width: 760px) {
  nav.toc {
    position: static;
    flex-direction: row;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }
  nav.toc::-webkit-scrollbar { display: none; }
}

.toc-doc-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 14px 0 4px;
}

@media (max-width: 760px) { .toc-doc-label { display: none; } }

nav.toc button {
  all: unset;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--muted);
  padding: 7px 10px;
  border-radius: 7px;
  line-height: 1.3;
  white-space: nowrap;
}

nav.toc button:hover { background: var(--tag-bg); color: var(--ink); }
nav.toc button.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

nav.toc .doc-switch {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

@media (max-width: 760px) { nav.toc .doc-switch { margin-bottom: 0; } }

.doc-switch a {
  flex: 1;
  text-align: center;
  font-weight: 600;
  font-size: 12px;
  padding: 9px 8px;
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline-strong);
}

.doc-switch a:hover { opacity: 1; background: var(--tag-bg); }

.doc-switch a.active {
  background: var(--accent);
  color: var(--paper-raised);
  border-color: var(--accent);
}

@media (max-width: 760px) {
  .doc-switch { flex: none; }
  .doc-switch a { flex: none; min-width: 140px; }
}

/* ---------- Document body ---------- */
main { min-width: 0; }

.doc-header {
  margin-bottom: 28px;
}

.doc-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 700;
  font-size: 34px;
  line-height: 1.1;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}

.doc-sub {
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.55;
  max-width: 540px;
}

.tags { display: flex; gap: 6px; margin-top: 14px; flex-wrap: wrap; }

.tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.03em;
  background: var(--tag-bg);
  color: var(--muted);
  padding: 4px 9px;
  border-radius: 100px;
}

section.clause {
  padding: 22px 0;
  border-top: 1px solid var(--hairline);
}

section.clause:first-of-type { border-top: 1px solid var(--hairline); }

.clause-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.clause-num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--faint);
  flex-shrink: 0;
  min-width: 24px;
}

.clause-title {
  font-family: 'Source Serif 4', serif;
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.005em;
}

.clause-body {
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--ink-soft);
  max-width: 640px;
}

.clause-body p { margin: 0 0 12px; }
.clause-body p:last-child { margin-bottom: 0; }

.clause-body ul {
  margin: 8px 0 12px;
  padding-left: 20px;
}
.clause-body li { margin-bottom: 6px; }
.clause-body li:last-child { margin-bottom: 0; }

.clause-body strong { color: var(--ink); font-weight: 600; }

table.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 4px;
  font-size: 13.5px;
}

table.data-table th, table.data-table td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}

table.data-table th {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 500;
}

.callout {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: 4px 0 12px;
}

.callout strong { color: var(--accent); }

.contact-card {
  background: var(--paper-raised);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 18px 20px;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
}

.contact-card .role {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--faint);
  display: block;
  margin-bottom: 4px;
}

footer.doc-footer {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
  font-size: 12px;
  color: var(--faint);
  line-height: 1.6;
}

@media (max-width: 760px) {
  .doc-title { font-size: 27px; }
  .clause-title { font-size: 16.5px; }
}