:root {
  --bg: #f8f9fa;
  --paper: #ffffff;
  --ink: #202122;
  --muted: #54595d;
  --line: #a2a9b1;
  --soft-line: #eaecf0;
  --link: #0645ad;
  --link-hover: #3366cc;
  --blue-soft: #f1f7ff;
  --green-soft: #f3fbf5;
  --yellow-soft: #fff8dc;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: Georgia, "Times New Roman", Times, serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at top left, rgba(51, 102, 204, 0.08), transparent 32rem),
    linear-gradient(90deg, rgba(255,255,255,0.8), transparent 18%, transparent 82%, rgba(255,255,255,0.8));
  z-index: -1;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover,
a:focus {
  color: var(--link-hover);
  text-decoration: underline;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.wiki-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 240px minmax(240px, 520px) auto;
  gap: 20px;
  align-items: center;
  min-height: 64px;
  padding: 10px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-title {
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-label {
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.ask-form {
  display: flex;
  min-width: 0;
}

.ask-form input {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-right: 0;
  border-radius: 3px 0 0 3px;
  padding: 9px 12px;
  font: inherit;
  background: #fff;
}

.ask-form button {
  border: 1px solid var(--line);
  border-radius: 0 3px 3px 0;
  padding: 9px 14px;
  background: #f8f9fa;
  color: var(--ink);
  cursor: pointer;
  font-weight: 600;
}

.ask-form button:hover {
  background: #eaecf0;
}

.top-links {
  display: flex;
  justify-content: flex-end;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 14px;
}

.wiki-shell {
  display: grid;
  grid-template-columns: 190px minmax(0, 1120px);
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 28px 48px;
}

.sidebar {
  position: sticky;
  top: 88px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 0;
  font-size: 14px;
}

.sidebar-kicker {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar a {
  display: block;
  padding: 7px 10px;
  border-left: 3px solid transparent;
  color: var(--ink);
}

.sidebar a:hover,
.sidebar a.active {
  border-left-color: var(--link-hover);
  background: var(--blue-soft);
  text-decoration: none;
}

.page-main {
  min-width: 0;
}

.article-tabs {
  display: flex;
  justify-content: flex-end;
  gap: 4px;
  margin-bottom: -1px;
  padding-right: 14px;
  font-size: 13px;
}

.article-tabs a {
  border: 1px solid var(--soft-line);
  border-bottom: 0;
  border-radius: 4px 4px 0 0;
  padding: 7px 12px;
  background: #f8f9fa;
}

.article-tabs a.active {
  background: var(--paper);
  color: var(--ink);
}

.article {
  min-height: 70vh;
  padding: 34px 36px 26px;
  border: 1px solid var(--soft-line);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.article h1 {
  margin: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.035em;
}

.subtitle {
  margin: 8px 0 22px;
  color: var(--muted);
  font-size: 14px;
}

.article [id] {
  scroll-margin-top: 88px;
}

.article h2 {
  clear: none;
  margin: 34px 0 12px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 500;
}

.article h3 {
  margin: 0 0 4px;
  font-size: 17px;
}

.article p,
.article li {
  color: var(--ink);
}

.infobox {
  float: right;
  width: min(330px, 42%);
  margin: 0 0 20px 28px;
  border: 1px solid var(--line);
  background: #f8f9fa;
  font-size: 13px;
}

.infobox h2 {
  margin: 0;
  padding: 10px 12px;
  border: 0;
  background: #eaecf0;
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 700;
  text-align: center;
}

.infobox img {
  display: block;
  width: calc(100% - 20px);
  max-height: 330px;
  object-fit: contain;
  object-position: center;
  margin: 10px auto;
  border: 1px solid var(--soft-line);
  border-radius: 6px;
  background: #111827;
}

.infobox-caption {
  margin: 8px 12px 12px;
  color: var(--muted);
  text-align: center;
  font-size: 12px;
  line-height: 1.45;
}

.infobox dl {
  display: grid;
  grid-template-columns: 34% 66%;
  margin: 0;
  border-top: 1px solid var(--soft-line);
}

.infobox dt,
.infobox dd {
  margin: 0;
  padding: 8px 9px;
  border-bottom: 1px solid var(--soft-line);
}

.infobox dt {
  font-weight: 700;
  background: rgba(234, 236, 240, 0.65);
}

.note {
  margin: 18px 0;
  padding: 14px 16px;
  border: 1px solid var(--soft-line);
  border-left: 4px solid var(--link-hover);
  background: var(--blue-soft);
}

.boundary-note {
  border-left-color: #72777d;
  background: #f8f9fa;
}

.ask-panel {
  clear: both;
  margin: 28px 0;
  padding: 18px;
  border: 1px solid var(--soft-line);
  background: linear-gradient(135deg, #ffffff, #f8fbff);
}

.ask-panel h2 {
  margin-top: 0;
}

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

.question-grid a {
  display: block;
  padding: 12px 14px;
  border: 1px solid #d8e3f7;
  border-radius: 6px;
  background: #fff;
  font-weight: 600;
}

.question-grid a:hover {
  background: var(--blue-soft);
  text-decoration: none;
}

.contents {
  display: inline-block;
  min-width: 270px;
  margin: 4px 0 12px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  background: #f8f9fa;
  font-size: 14px;
}

.contents p {
  margin: 0 0 6px;
  text-align: center;
  font-weight: 700;
}

.contents ol {
  margin: 0;
  padding-left: 22px;
}

.card-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.mini-card {
  padding: 15px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: #fff;
}

.mini-card:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
}

.reference-list {
  display: grid;
  gap: 14px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 16px 0 24px;
}

.category-card,
.reference-card {
  padding: 16px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: linear-gradient(135deg, #ffffff, #f8fbff);
}

.reference-card h3 {
  margin-bottom: 8px;
}

.category-examples,
.section-note,
.paper-meta {
  color: var(--muted);
  font-size: 13px;
}

.category-examples,
.paper-meta {
  margin-bottom: 0;
}

.paper-card {
  border-left: 4px solid #3366cc;
}

.ops-card {
  border-left: 4px solid #64748b;
}

.reference-card p {
  margin-top: 0;
}

.reference-card code {
  padding: 1px 5px;
  border: 1px solid var(--soft-line);
  border-radius: 4px;
  background: #f8f9fa;
  font-size: .94em;
}

.reading-table {
  display: block;
  width: 100%;
  margin: 14px 0 28px;
  border-collapse: collapse;
  overflow-x: auto;
  white-space: normal;
}

.reading-table th,
.reading-table td {
  min-width: 160px;
  padding: 10px 12px;
  border: 1px solid var(--soft-line);
  vertical-align: top;
  background: #fff;
}

.reading-table th {
  background: #f8f9fa;
  font-size: 13px;
  text-align: left;
}

.reading-table td:nth-child(2) {
  min-width: 300px;
}

.reading-table td:nth-child(3) {
  min-width: 360px;
}

.depth-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 16px;
}

.depth-legend span,
.depth-group summary {
  align-items: center;
}

.depth-legend > span {
  display: inline-flex;
  gap: 6px;
  padding: 6px 9px;
  border: 1px solid var(--soft-line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font-size: 13px;
}

.depth-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.1em;
  padding: 1px 6px;
  border-radius: 999px;
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  line-height: 1.6;
  white-space: nowrap;
}

.grade-a { background: #b42318; }
.grade-am { background: #c2410c; }
.grade-bp { background: #b7791f; }
.grade-b { background: #2f6f4e; }
.grade-c { background: #64748b; }
.grade-nv { background: #111827; }

.depth-group {
  margin: 14px 0;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: #fff;
}

.depth-group summary {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  cursor: pointer;
  font-weight: 700;
}

.depth-group[open] summary {
  border-bottom: 1px solid var(--soft-line);
  background: #f8f9fa;
}

.depth-table,
.depth-policy-table {
  margin: 0;
}

.depth-table td:first-child {
  min-width: 260px;
}

.depth-table td:nth-child(2) {
  min-width: 260px;
  color: var(--muted);
  font-size: 13px;
}

.fact-list {
  display: grid;
  grid-template-columns: minmax(110px, 22%) minmax(0, 1fr);
  margin: 14px 0 20px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  overflow: hidden;
}

.fact-list dt,
.fact-list dd {
  margin: 0;
  padding: 10px 12px;
  border-bottom: 1px solid var(--soft-line);
}

.fact-list dt {
  font-weight: 700;
  background: #f8f9fa;
}

.fact-list dd {
  min-width: 0;
  background: #fff;
}

.fact-list dt:nth-last-of-type(1),
.fact-list dd:nth-last-of-type(1) {
  border-bottom: 0;
}

.tag {
  display: inline-block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.publication-list li {
  margin-bottom: 12px;
}

.status {
  display: inline-block;
  margin-left: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.accepted {
  background: #dcfce7;
  color: #166534;
}

.review {
  background: #fef3c7;
  color: #92400e;
}

.technical {
  background: #dbeafe;
  color: #1e40af;
}

.layer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}

.layer-grid article {
  padding: 15px;
  border: 1px solid var(--soft-line);
  border-radius: 8px;
  background: linear-gradient(180deg, #ffffff, #f8fbff);
}

.callout-link {
  display: inline-block;
  padding: 10px 14px;
  border: 1px solid #d8e3f7;
  border-radius: 7px;
  background: var(--blue-soft);
  font-weight: 700;
}

.map-shell {
  max-width: 1480px;
}

.research-map-article .article h2,
.research-map-article h2 {
  clear: none;
}

.map-board {
  margin: 26px 0 34px;
  padding: 18px;
  border: 1px solid #d8e3f7;
  border-radius: 14px;
  background: radial-gradient(circle at center, rgba(51, 102, 204, 0.08), transparent 42%), #fbfdff;
}

.map-node {
  position: relative;
  padding: 16px;
  border: 1px solid var(--soft-line);
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.04);
}

.map-core {
  max-width: 720px;
  margin: 0 auto 20px;
  border-color: #b6cef5;
  background: linear-gradient(135deg, #fff, #f1f7ff);
  text-align: center;
}

.map-core h2 {
  margin-top: 6px;
  border-bottom: 0;
  font-family: var(--serif);
}

.map-branches {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.workflow-list li {
  margin-bottom: 10px;
}

.timeline {
  display: grid;
  gap: 12px;
}

.timeline > div {
  padding: 14px 16px;
  border-left: 4px solid #d8e3f7;
  background: #fbfcff;
}

.timeline p {
  margin: 0;
}

.category-footer {
  clear: both;
  margin-top: 36px;
  padding: 14px 16px;
  border: 1px solid var(--soft-line);
  background: #f8f9fa;
  color: var(--muted);
  font-size: 13px;
}

.search-message {
  margin-left: 8px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 1050px) {
  .wiki-header {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .top-links {
    justify-content: flex-start;
  }

  .wiki-shell {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    padding: 0;
  }

  .sidebar-kicker {
    grid-column: 1 / -1;
  }

  .sidebar a {
    border: 1px solid var(--soft-line);
    border-left: 3px solid transparent;
    border-radius: 5px;
    background: #fff;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 15px;
  }

  .wiki-header {
    position: static;
    padding: 14px 16px;
  }

  .brand {
    flex-wrap: wrap;
  }

  .sidebar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .article-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    padding: 0;
  }

  .article {
    padding: 22px 18px;
  }

  .infobox {
    float: none;
    width: 100%;
    margin: 0 0 22px;
  }

  .question-grid,
  .card-list,
  .category-grid,
  .layer-grid,
  .map-branches {
    grid-template-columns: 1fr;
  }

  .contents {
    width: 100%;
  }
}

@media print {
  .wiki-header,
  .sidebar,
  .article-tabs,
  .ask-form {
    display: none;
  }

  .wiki-shell,
  .article {
    display: block;
    margin: 0;
    padding: 0;
    border: 0;
    box-shadow: none;
  }
}