:root {
  --bg: #090b10;
  --bg-elevated: #11141c;
  --bg-card: #161a24;
  --border: rgba(255, 255, 255, 0.09);
  --text: #eef1f8;
  --text-muted: #9ca6ba;
  --text-soft: #b8c0d4;
  --accent: #8b7cff;
  --accent-2: #45d9c8;
  --accent-3: #ff8ec4;
  --code-bg: #0c0f15;
  --sidebar-w: 292px;
  --content-max: 780px;
  --radius: 12px;
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  --font-sans: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --font-display: "Outfit", var(--font-sans);
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 2.5rem;
}

[id] {
  scroll-margin-top: 2.5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-2);
  text-decoration: none;
  transition: color 0.15s;
}

a:hover {
  color: #7ef0e4;
  text-decoration: underline;
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* —— Sidebar —— */
.sidebar {
  position: sticky;
  top: 0;
  flex: 0 0 var(--sidebar-w);
  width: var(--sidebar-w);
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  border-right: 1px solid var(--border);
  background: linear-gradient(180deg, #0d1018 0%, var(--bg) 100%);
  padding: 1.25rem 0.75rem 5rem;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding: 0 0.65rem;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3));
  flex-shrink: 0;
}

.brand h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand p {
  margin: 0.1rem 0 0;
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.nav-section {
  border-radius: 10px;
  overflow: hidden;
}

.nav-section-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.55rem 0.7rem;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--text-soft);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s, color 0.15s;
}

.nav-section-toggle:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.nav-section-toggle .chevron {
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.2s ease;
  flex-shrink: 0;
  margin-left: 0.5rem;
  opacity: 0.7;
}

.nav-section.open .nav-section-toggle .chevron {
  transform: rotate(45deg);
}

.nav-section-children {
  display: none;
  flex-direction: column;
  gap: 0.1rem;
  padding: 0.15rem 0 0.5rem 0.35rem;
}

.nav-section.open .nav-section-children {
  display: flex;
}

.nav-link {
  display: block;
  padding: 0.38rem 0.65rem 0.38rem 0.85rem;
  border-left: 2px solid transparent;
  border-radius: 0 8px 8px 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 450;
  text-decoration: none;
  line-height: 1.4;
  transition: color 0.15s, background 0.15s, border-color 0.15s;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(139, 124, 255, 0.1);
  text-decoration: none;
}

.nav-link.active {
  color: var(--text);
  border-left-color: var(--accent);
  background: rgba(139, 124, 255, 0.16);
  font-weight: 600;
}

.nav-link.sub {
  padding-left: 1.15rem;
  font-size: 0.84rem;
}

/* —— Centered main column —— */
.content-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  justify-content: center;
}

.main {
  width: 100%;
  max-width: var(--content-max);
  padding: 2rem 2.5rem 5rem;
}

/* —— Hero —— */
.hero {
  margin-bottom: 2.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-banner {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
}

.hero-body {
  padding: 1.75rem 2rem 2rem;
  background:
    radial-gradient(ellipse 70% 50% at 0% 100%, rgba(139, 124, 255, 0.14), transparent 55%),
    var(--bg-card);
}

.hero .tagline {
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.hero-authors {
  margin: 0;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
}

.hero-authors h2 {
  margin: 1rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.hero-authors .author-list {
  margin-bottom: 0.75rem;
}

.hero-authors .author-supervision {
  margin: 0;
}

.hero .tagline strong {
  color: #e2e6f5;
  font-weight: 600;
}

.hero h2 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.hero .lead {
  margin: 0 0 1.1rem;
  font-size: 1.02rem;
  color: var(--text-soft);
  line-height: 1.65;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.6rem;
  margin-top: 1rem;
}

.pillar {
  text-align: center;
  padding: 0.7rem 0.4rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pillar.methods { color: #c4b8ff; border-color: rgba(139, 124, 255, 0.35); }
.pillar.backbones { color: #8ec0ff; border-color: rgba(100, 160, 255, 0.35); }
.pillar.benchmarks { color: #6ee7c0; border-color: rgba(52, 211, 153, 0.35); }
.pillar.evaluation { color: #ffc299; border-color: rgba(255, 150, 80, 0.35); }

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1.15rem;
}

.badge {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
}

/* —— Sections —— */
.doc-section {
  margin-bottom: 3.25rem;
  scroll-margin-top: 2rem;
}

.doc-section > h2 {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  margin: 0 0 1.1rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.doc-section h3 {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  margin: 2rem 0 0.65rem;
  color: #e4e8f4;
  scroll-margin-top: 2rem;
}

.doc-section h4 {
  font-size: 0.98rem;
  font-weight: 600;
  margin: 1.35rem 0 0.5rem;
  color: var(--text-soft);
}

.doc-section p,
.doc-section li {
  color: var(--text-soft);
  margin: 0 0 0.85rem;
}

.doc-section ul,
.doc-section ol {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
}

.doc-section li {
  margin-bottom: 0.35rem;
}

/* Inline code only — not inside <pre> blocks */
.doc-section :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 0.12em 0.38em;
  border-radius: 5px;
  background: rgba(139, 124, 255, 0.12);
  color: #d4cffd;
  font-weight: 500;
  word-break: break-word;
}

td code,
th code {
  font-size: 0.82em;
  white-space: normal;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.85rem;
  margin: 1rem 0 1.25rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
}

.card h4 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 0.92rem;
}

.card p {
  margin: 0;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.flow {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.35rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.85;
  color: var(--text-muted);
  overflow-x: auto;
  margin: 1rem 0;
}

.flow .step {
  color: var(--accent-2);
  font-weight: 600;
}

.table-scroll {
  width: 100%;
  overflow-x: auto;
  margin: 1rem 0 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  -webkit-overflow-scrolling: touch;
}

.table-scroll table {
  margin: 0;
  min-width: 520px;
  border: none;
}

.table-scroll table th:first-child,
.table-scroll table td:first-child {
  padding-left: 1rem;
}

.table-scroll table th:last-child,
.table-scroll table td:last-child {
  padding-right: 1rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 1rem 0 1.25rem;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--bg-elevated);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--text);
}

tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

.code-block {
  margin: 0.85rem 0 1.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--code-bg);
  overflow: hidden;
}

.code-block-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 2.25rem;
  padding: 0.35rem 0.65rem 0.35rem 0.85rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.28);
}

.code-block .lang {
  font-size: 0.65rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  flex-shrink: 0;
}

.code-block pre {
  margin: 0;
  padding: 0.95rem 1.15rem 1.05rem;
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.65;
  tab-size: 4;
  -webkit-overflow-scrolling: touch;
}

.code-block code {
  display: block;
  font-family: var(--font-mono);
  color: #dce4f4;
  font-weight: 400;
  white-space: pre;
  word-wrap: normal;
  overflow-wrap: normal;
}

.copy-btn {
  flex-shrink: 0;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1.2;
}

.copy-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.callout {
  border-left: 3px solid var(--accent);
  background: rgba(139, 124, 255, 0.09);
  padding: 0.9rem 1.05rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1rem 0;
  font-size: 0.92rem;
  line-height: 1.65;
}

.callout p {
  margin: 0;
}

.callout.warn {
  border-left-color: #f0a030;
  background: rgba(240, 160, 48, 0.08);
}

.callout strong {
  color: var(--text);
  font-weight: 600;
}

.author-list {
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.author-list li {
  margin: 0;
}

.author-name {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid rgba(139, 124, 255, 0.35);
  background: rgba(139, 124, 255, 0.1);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
}

.author-supervision {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.86rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.7;
}

.footer p {
  margin: 0;
}

.menu-toggle {
  display: none;
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  padding: 0.65rem 1.1rem;
  border-radius: 999px;
  border: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0a0c10;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.sidebar-backdrop {
  display: none;
}

@media (max-width: 960px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 95;
    transform: translateX(-100%);
    transition: transform 0.28s ease;
    box-shadow: var(--shadow);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 90;
    background: rgba(0, 0, 0, 0.55);
  }

  .sidebar-backdrop.visible {
    display: block;
  }

  .main {
    padding: 1.25rem 1.15rem 4.5rem;
  }

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

  .menu-toggle {
    display: block;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .hero-body {
    padding: 1.25rem 1.15rem 1.5rem;
  }
}