:root {
  color-scheme: dark;
  --bg: #0f1115;
  --panel: #12151b;
  --panel-2: #171b22;
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.12);
  --text: #edf1f7;
  --muted: #97a1b2;
  --soft: #c5cede;
  --accent: #7aa2ff;
  --accent-bg: rgba(122, 162, 255, 0.14);
  --success: #74d99f;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
  --sidebar-width: 318px;
  --toc-width: 220px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.65 Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body.mobile-menu-open {
  overflow: hidden;
}

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

a:hover {
  text-decoration: underline;
}

.app {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr) var(--toc-width);
}

.mobile-header,
.mobile-backdrop {
  display: none;
}

.mobile-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(13, 16, 21, 0.92);
  backdrop-filter: blur(16px);
}

.mobile-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.mobile-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.mobile-menu-toggle:hover {
  border-color: var(--line-2);
}

.mobile-brand {
  min-width: 0;
  color: var(--text);
  text-decoration: none;
}

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

.mobile-brand-title {
  display: block;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
}

.mobile-brand-subtitle {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.2;
}

.mobile-backdrop {
  position: fixed;
  inset: 0;
  z-index: 25;
  background: rgba(0, 0, 0, 0.48);
  opacity: 0;
  pointer-events: none;
  touch-action: manipulation;
  transition: opacity .18s ease;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 22px 18px 24px;
  border-right: 1px solid var(--line);
  background: #0d1015;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 18px;
}

.brand-kicker {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.25;
}

.search {
  display: flex;
  align-items: center;
  width: 100%;
  margin-bottom: 10px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--muted);
}

.search-input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
}

.search-input::placeholder {
  color: var(--muted);
}

.search-results {
  display: none;
  width: 100%;
  margin: 0 0 18px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.search-results.visible {
  display: block;
}

.search-result {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--soft);
}

.search-result:hover {
  text-decoration: none;
  background: rgba(255,255,255,.04);
  color: var(--text);
}

.search-result strong {
  display: block;
  color: var(--text);
  font-size: 14px;
}

.search-result span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

.nav-group {
  margin-top: 18px;
}

.nav-title {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link,
.nav-placeholder {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--soft);
  font-size: 15px;
  transition: background .15s ease, color .15s ease;
}

.nav-link:hover {
  background: rgba(255,255,255,.04);
  color: var(--text);
  text-decoration: none;
}

.nav-link.active {
  background: var(--accent-bg);
  color: #dce7ff;
  font-weight: 600;
}

.nav-placeholder {
  color: #667182;
}

.content-wrap {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 17, 21, 0.84);
  backdrop-filter: blur(14px);
}

.crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.crumbs a {
  color: var(--muted);
}

.crumbs a:hover {
  color: var(--text);
  text-decoration: none;
}

.crumb-sep {
  color: #5f6877;
}

.topbar-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  background: var(--panel);
}

.topbar-link:hover {
  text-decoration: none;
  border-color: var(--line-2);
}

.content {
  width: min(860px, calc(100vw - var(--sidebar-width) - var(--toc-width) - 96px));
  padding: 34px 28px 72px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(32px, 4vw, 46px);
  line-height: 1.05;
}

h2 {
  margin: 38px 0 12px;
  font-size: 24px;
  line-height: 1.2;
}

h3 {
  margin: 24px 0 10px;
  font-size: 18px;
  line-height: 1.3;
}

p {
  margin: 0 0 16px;
  color: var(--soft);
}

.lede {
  max-width: 700px;
  color: #cfd7e5;
  font-size: 17px;
}

.card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.card + .card {
  margin-top: 14px;
}

.grid {
  display: grid;
  gap: 14px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.muted {
  color: var(--muted);
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--soft);
  background: rgba(255,255,255,.03);
  font-size: 13px;
}

.callout {
  margin: 22px 0;
  padding: 16px 18px;
  border: 1px solid rgba(116, 217, 159, 0.18);
  border-radius: 14px;
  background: rgba(116, 217, 159, 0.08);
}

.callout strong {
  color: #dff7ea;
}

.list-links {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.list-links a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
}

.list-links a:hover {
  text-decoration: none;
  border-color: var(--line-2);
}

.list-links a strong {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
}

.list-links a span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.app-links {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

.app-link {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
}

.app-link:hover {
  text-decoration: none;
  border-color: var(--line-2);
}

.app-link strong {
  display: block;
  margin-bottom: 6px;
  font-size: 18px;
}

.app-link span {
  display: block;
  color: var(--muted);
}

ul.clean {
  margin: 0;
  padding-left: 18px;
  color: var(--soft);
}

ul.clean li + li {
  margin-top: 10px;
}

.toc {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 18px 24px;
  border-left: 1px solid var(--line);
  background: #0d1015;
}

.toc h4 {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.toc a {
  display: block;
  margin: 0 0 10px;
  color: var(--soft);
  font-size: 14px;
}

.toc a:hover {
  color: var(--text);
  text-decoration: none;
}

.footer-note {
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 1180px) {
  .app {
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  }

  .toc {
    display: none;
  }

  .content {
    width: min(860px, calc(100vw - var(--sidebar-width) - 56px));
  }
}

@media (max-width: 860px) {
  .app {
    display: block;
    min-height: auto;
  }

  .mobile-header,
  .mobile-backdrop {
    display: flex;
  }

  .mobile-backdrop {
    display: block;
  }

  body.mobile-menu-open .mobile-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 30;
    width: min(86vw, 320px);
    height: 100dvh;
    padding: 18px 16px 24px;
    border-right: 1px solid var(--line);
    border-bottom: 0;
    transform: translateX(-100%);
    transition: transform .18s ease;
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.4);
  }

  body.mobile-menu-open .sidebar {
    transform: translateX(0);
  }

  .content-wrap {
    min-width: 0;
    padding-top: 65px;
  }

  .topbar {
    position: static;
    padding: 12px 16px;
    align-items: flex-start;
    gap: 10px;
    flex-direction: column;
    background: transparent;
    backdrop-filter: none;
  }

  .topbar-link {
    width: 100%;
    justify-content: center;
  }

  .content {
    width: auto;
    padding: 14px 16px 48px;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}