/* ============================================================
   Enterprise document publisher — screen styles

   Design language: restrained, typographic, North-American
   enterprise documentation. System sans for the UI/furniture
   layer; readable serif for document prose.

   Shared paper system
   -------------------
   - `.document` and `.site-index` share ONE outer paper width.
   - Furniture (top bar, masthead, title, metadata, register,
     footer) spans the full paper width.
   - Prose is constrained to `--document-measure` for a calm,
     comfortable reading line length. Tables, figures, and code
     may break out to the full content width.

   Default document format is US Letter. Print is defined in
   print.css (`@page { size: letter }`). This file is screen-only.
   ============================================================ */

* {
  box-sizing: border-box;
}

html {
  overflow-x: clip; /* Guardrail: clips visual overflow at html boundary without
                       creating a scroll container or affecting position:sticky */
}

:root {
  color-scheme: light;

  /* palette */
  --bg: #eceef1;
  --paper: #ffffff;
  --text: #1a1c20;
  --muted: #6a717b;
  --faint: #9aa1aa;
  --line: #e1e4e9;
  --strong-line: #c2c7ce;
  --accent: #1d3f5f;
  --brand-accent: #1d3f5f; /* overridden per-brand via inline <style> */
  --soft: #f7f8fa;
  --code-bg: #eef1f4;

  /* type system — Latin stacks first, then system CJK fallbacks so Chinese /
     Japanese / Korean documents render consistently across platforms without
     bundling any web fonts. */
  --font-cjk: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  --font-cjk-serif: "Songti SC", "SimSun", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, var(--font-cjk);
  --font-serif: Georgia, "Times New Roman", "Source Serif 4", var(--font-cjk-serif);
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, var(--font-cjk), monospace;

  /* shared paper system */
  --paper-width: 1040px;
  --paper-padding-x: 76px;
  --paper-padding-y: 64px;
  --document-measure: 680px;

  font-family: var(--font-serif);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--brand-accent);
  text-underline-offset: 2px;
}

/* ---- shared top bar (both surfaces) ----------------------- */
.site-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 56px;
  padding: 0 clamp(20px, 5vw, 52px);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(1.1) blur(8px);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-sans);
}

.topbar-brand {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text);
}

.topbar-link {
  position: relative;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--muted);
  padding-left: 18px;
}

/* subtle leading divider so the link reads as intentional nav, not stray text */
.topbar-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1px;
  height: 14px;
  transform: translateY(-50%);
  background: var(--line);
}

.topbar-link:hover {
  color: var(--text);
}

/* ---- shared paper sheet ----------------------------------- */
.document,
.site-index {
  width: min(100% - 40px, var(--paper-width));
  margin: 40px auto;
  padding: var(--paper-padding-y) var(--paper-padding-x);
  background: var(--paper);
  border: 1px solid #d9dde2;
  border-radius: 3px;
  box-shadow: 0 1px 2px rgba(31, 38, 48, 0.06), 0 22px 50px rgba(31, 38, 48, 0.10);
}

/* ---- masthead --------------------------------------------- */
.document-masthead,
.register-header {
  padding-bottom: 14px;
  border-bottom: 2px solid var(--brand-accent);
}

.masthead-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
}

.masthead-brand {
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.masthead-slogan {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-align: right;
  text-transform: uppercase;
}

/* ---- title block + executive identity --------------------- */
.document-title-block {
  padding: 30px 0 0;
}

.document-kicker {
  margin: 0 0 12px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* Fluid title: scales down for long / CJK titles, never giant or heavy. */
h1 {
  margin: 0;
  max-width: min(100%, 880px);
  font-family: var(--font-sans);
  font-size: clamp(25px, 1.4vw + 1.1rem, 34px);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.01em;
  overflow-wrap: normal;
  word-break: normal;
  text-wrap: pretty;
}

h1:lang(zh) {
  letter-spacing: 0;
}

/* Long Chinese contracts: strict CJK line breaking, justified body text,
   and slightly looser leading for dense hanzi paragraphs. Applies when the
   document language is Chinese or content carries lang="zh". */
:lang(zh) p,
:lang(zh) li,
:lang(zh) blockquote {
  line-break: strict;
  word-break: normal;
  overflow-wrap: break-word;
  text-align: justify;
  text-justify: inter-ideograph;
}

/* ---- document metadata grid ──────────────────────────────────────────────
   2-row × 4-column layout replacing the old identity/summary bar. */
.document-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px 28px;
  margin-top: 18px;
  font-family: var(--font-sans);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.meta-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--faint);
}

.meta-value {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text);
  overflow-wrap: break-word;
  word-break: break-word;
}

.meta-value--id {
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 12.5px;
}

.meta-value--empty {
  color: var(--faint);
}

/* ---- quiet status / classification tags -------------------
   Premium, understated: a small status dot + muted small-caps label.
   No filled pill, no border, no loud color. The dot carries state. */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--faint);
  flex: none;
}

.status-final::before {
  background: var(--brand-accent);
}

.is-public::before {
  background: #5a9b73;
}

.is-internal::before {
  background: #c9a449;
}

.is-confidential::before {
  background: #b4453a;
}


/* ---- actions (web only) -----------------------------------
   Compact, secondary, right-aligned so it does not interrupt the
   masthead → title → meta flow. */
.document-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
}

.action-btn--download-pdf {
  text-decoration: none;
}

.action-btn {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 18px;
  line-height: 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.action-btn:hover {
  border-color: var(--strong-line);
  color: var(--text);
}

.action-btn:focus-visible {
  outline: 2px solid var(--brand-accent);
  outline-offset: 2px;
}

/* ---- table of contents ------------------------------------
   A light navigation aid, not a callout box: no fill, restrained
   type. Two columns when there is room so long agreements stay
   compact and readable. */
.document-toc {
  margin: 30px 0;
  padding-top: 16px;
}

.toc-details summary {
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.toc-details summary::-webkit-details-marker {
  display: none;
}

.toc-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}

/* disclosure affordance: a small chevron that rotates when open */
.toc-details summary.toc-title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-right: 1.5px solid var(--faint);
  border-bottom: 1.5px solid var(--faint);
  transform: rotate(-45deg) translateY(-1px);
  transition: transform 0.12s ease;
  flex: none;
}

.toc-details[open] summary.toc-title::before {
  transform: rotate(45deg);
}

.toc-details summary:hover.toc-title,
.toc-details summary:hover.toc-title::before {
  color: var(--muted);
  border-color: var(--muted);
}

.toc-count {
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--faint);
}

.toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-sans);
  font-size: 12.5px;
  line-height: 1.45;
  columns: 2;
  column-gap: 44px;
}

.toc-list li {
  margin: 0 0 6px;
  break-inside: avoid;
}

/* Indentation is relative to the shallowest heading present (toc-d0 = top). */
.toc-list .toc-d1 {
  padding-left: 16px;
}

.toc-list .toc-d2 {
  padding-left: 32px;
}

.toc-list a {
  text-decoration: none;
  color: var(--muted);
  transition: color 0.12s ease;
}

.toc-list a:hover {
  color: var(--brand-accent);
}

/* ============================================================
   Document body
   ============================================================ */
.document-content {
  padding-top: 26px;
  font-size: 16.5px;
  overflow-wrap: break-word; /* Prevent long URLs / unbreakable strings from
                                forcing body-level horizontal scroll */
}

p,
ul,
ol,
blockquote,
pre,
.callout,
.block-warning,
.table-wrap,
figure {
  margin: 0 0 16px;
}

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

/* headings */
h2,
h3,
h4,
h5 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.28;
  color: var(--text);
  scroll-margin-top: 70px;
}

h2 {
  margin: 38px 0 12px;
  padding-top: 16px;
  border-top: 1px solid #eceff3;
  font-size: 21px;
}

h3 {
  margin: 28px 0 10px;
  font-size: 17px;
}

h4 {
  margin: 22px 0 8px;
  font-size: 15px;
  letter-spacing: 0.01em;
}

h5 {
  margin: 18px 0 8px;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.document-content > h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

/* lists */
ul,
ol {
  padding-left: 1.45em;
}

li + li {
  margin-top: 6px;
}

li > ul,
li > ol {
  margin: 6px 0 0;
}

/* quote */
blockquote {
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--brand-accent);
  color: #34383f;
  font-style: italic;
}

/* callouts */
.callout,
.block-warning {
  padding: 13px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand-accent);
  border-radius: 3px;
  background: var(--soft);
}

.block-warning {
  border-left-color: #c9a449;
  background: #fff8e5;
}

/* code */
pre {
  max-width: 100%; /* Prevents code blocks from exceeding container width;
                      overflow:auto below handles internal horizontal scroll */
  overflow: auto;
  padding: 15px 17px;
  tab-size: 4;
  line-height: 1.5;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #f6f7f8;
  color: #1d232b;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

:not(pre) > code {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--code-bg);
}

pre code {
  padding: 0;
  border: 0;
  background: transparent;
  font-size: 0.86em;
}

/* figures */
img {
  max-width: 100%;
  height: auto;
}

figure {
  margin-left: 0;
  margin-right: 0;
}

figure img {
  display: block;
  border: 1px solid var(--line);
  border-radius: 3px;
}

figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 12px;
}

/* file / attachment links */
.file-link {
  font-family: var(--font-sans);
}

.file-link a {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--soft);
  font-size: 13px;
  text-decoration: none;
}

.file-link a::before {
  content: "";
  width: 10px;
  height: 12px;
  border: 1.5px solid currentColor;
  border-radius: 2px;
  opacity: 0.6;
}

.file-link a:hover {
  border-color: var(--strong-line);
}

/* tables */
.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border-top: 2px solid var(--brand-accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 13px;
}

th,
td {
  padding: 10px 12px;
  border: 0;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  background: transparent;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* Dense tables stay legible: subtle row separation, no zebra noise. */
tbody tr:hover {
  background: var(--soft);
}

td {
  overflow-wrap: break-word;
}

hr {
  margin: 32px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

/* ---- footer ----------------------------------------------- */
.document-footer,
.site-footer {
  margin-top: 48px;
  padding-top: 18px;
  border-top: 2px solid var(--brand-accent);
  color: var(--muted);
  font-family: var(--font-sans);
}

.site-footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.footer-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.footer-notice {
  margin: 10px 0 0;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  color: var(--faint);
}

/* ============================================================
   Document register
   ============================================================ */
.register-intro {
  max-width: var(--document-measure);
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.register-table-wrap {
  margin-top: 26px;
  overflow-x: auto;
}

.document-register {
  font-size: 13px;
}

.document-register th {
  border-bottom: 2px solid var(--strong-line);
}

.document-register td {
  padding-top: 13px;
  padding-bottom: 13px;
}

.document-register tbody tr:hover {
  background: var(--soft);
}

.document-register .register-title {
  font-family: var(--font-serif);
  font-size: 15px;
}

.document-register .register-title a {
  font-weight: 600;
  text-decoration: none;
}

.document-register .register-title a:hover {
  text-decoration: underline;
}

.document-register code {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--brand-accent);
  font-size: 12px;
  white-space: nowrap;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 920px) {
  :root {
    --paper-padding-x: 48px;
    --paper-padding-y: 48px;
  }
}

@media (max-width: 680px) {
  .document,
  .site-index {
    width: 100%;
    margin: 0;
    padding: 26px 22px;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .masthead-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  .masthead-slogan {
    text-align: left;
  }

  h1 {
    font-size: 28px;
    overflow-wrap: break-word; /* Long titles wrap instead of overflowing the viewport */
    word-break: break-word;
  }

  .document-meta-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 20px;
  }
}

@media (max-width: 680px) {
  .toc-list {
    columns: 1;
  }

  .site-topbar {
    height: 50px;
  }

  .document-content {
    font-size: 16px;
  }

  .document-kicker {
    margin-bottom: 8px;
  }

  th,
  td {
    padding: 8px 10px;
  }
}

@media (max-width: 460px) {
  .document,
  .site-index {
    padding: 22px 16px;
  }

  h1 {
    font-size: 24px;
  }

  .document-meta-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .register-table-wrap {
    margin-left: -16px;
    margin-right: -16px;
    padding: 0 16px;
  }
}

/* ============================================================
   Register — mobile card layout
   Below 560px the flat table re-stacks into labeled cards so
   dense registers stay readable without horizontal scrolling.
   Uses data-label attributes emitted by the renderer.
   ============================================================ */
@media (max-width: 560px) {
  .register-table-wrap {
    margin-left: 0;
    margin-right: 0;
    padding: 0;
    overflow: visible;
    border-top: 0;
  }

  .document-register,
  .document-register tbody,
  .document-register tr,
  .document-register td {
    display: block;
    width: 100%;
  }

  .document-register thead {
    display: none;
  }

  .document-register tr {
    margin-bottom: 14px;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: 4px;
    background: var(--paper);
  }

  .document-register tbody tr:hover {
    background: var(--soft);
  }

  .document-register td {
    padding: 3px 0;
    border-bottom: 0;
  }

  .document-register td::before {
    content: attr(data-label);
    display: block;
    margin-bottom: 1px;
    color: var(--faint);
    font-family: var(--font-sans);
    font-size: 9px;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
  }

  .document-register .register-title {
    padding-bottom: 8px;
    margin-bottom: 6px;
    border-bottom: 1px solid var(--line);
  }

  .document-register .register-title::before {
    display: none;
  }
}