:root {
  --bg: #02070b;
  --bg-elevated: #0a131c;
  --bg-soft: #050d14;
  --bg-glass: rgba(2, 7, 11, 0.78);
  --accent: #46b5f1;
  --accent-strong: #6cc4f4;
  --accent-soft: rgba(70, 181, 241, 0.12);
  --accent-line: rgba(70, 181, 241, 0.28);
  --text: #e1e7ee;
  --text-muted: #7f8b9a;
  --text-dim: #5a6573;
  --border: rgba(225, 231, 238, 0.08);
  --border-strong: rgba(225, 231, 238, 0.16);
  --radius: 12px;
  --max-width: 1280px;
  --topbar-height: 64px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--topbar-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(1100px 600px at 85% -10%, rgba(70, 181, 241, 0.07), transparent 60%),
    radial-gradient(900px 500px at -10% 110%, rgba(70, 181, 241, 0.05), transparent 60%);
  z-index: -1;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s ease, opacity 0.15s ease;
}
a:hover { color: var(--accent-strong); }

::selection { background: var(--accent); color: var(--bg); }

/* ============ TOPBAR ============ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--topbar-height);
  background: var(--bg-glass);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--text);
}
.brand:hover { color: var(--text); }
.brand-accent { color: var(--accent); }
.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), #1a4e75);
  box-shadow: 0 0 0 1px var(--accent-line), 0 0 24px rgba(70, 181, 241, 0.35);
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 3px;
  background: var(--bg);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  color: var(--text);
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}
.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ============ LAYOUT ============ */
.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  max-width: var(--max-width);
  margin: 0 auto;
  gap: 56px;
  padding: 0 32px;
}

/* ============ SIDEBAR ============ */
.sidebar {
  position: sticky;
  top: var(--topbar-height);
  align-self: start;
  height: calc(100vh - var(--topbar-height));
  overflow-y: auto;
  padding: 32px 0 32px;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}
.sidebar::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

.sidebar-inner { padding-right: 12px; }

.sidebar-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 12px;
  margin-bottom: 14px;
}

.sidebar .toc { font-size: 14px; }
.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sidebar > .toc > ul > li { margin-bottom: 4px; }

.sidebar a {
  display: block;
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.45;
  border-left: 2px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.sidebar a:hover {
  color: var(--text);
  background: var(--accent-soft);
}
.sidebar a.active {
  color: var(--accent);
  background: var(--accent-soft);
  border-left-color: var(--accent);
}
.sidebar > .toc > ul > li > a {
  color: var(--text);
  font-weight: 600;
  font-size: 14px;
}
.sidebar ul ul {
  margin: 4px 0 10px;
  padding-left: 12px;
  border-left: 1px solid var(--border);
  margin-left: 14px;
}
.sidebar ul ul a {
  font-size: 13px;
  font-weight: 400;
  padding: 5px 12px;
}

/* ============ CONTENT ============ */
.content {
  padding: 48px 0 80px;
  min-width: 0;
  max-width: 760px;
}

.markdown-body { word-wrap: break-word; }

.markdown-body h1 {
  font-size: 40px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.025em;
  line-height: 1.15;
  background: linear-gradient(180deg, #ffffff 0%, #b9c6d4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.markdown-body h1 + p {
  font-size: 18px;
  color: var(--text-muted);
  margin-top: 16px;
  margin-bottom: 32px;
  line-height: 1.6;
}

.markdown-body h2 {
  font-size: 28px;
  font-weight: 700;
  margin: 64px 0 20px;
  padding-top: 28px;
  letter-spacing: -0.015em;
  line-height: 1.25;
  border-top: 1px solid var(--border);
  scroll-margin-top: calc(var(--topbar-height) + 24px);
}
.markdown-body h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 32px;
}

.markdown-body h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 36px 0 12px;
  letter-spacing: -0.005em;
  color: var(--text);
  scroll-margin-top: calc(var(--topbar-height) + 24px);
}

.markdown-body h2 a.headerlink,
.markdown-body h3 a.headerlink {
  display: none;
}

.markdown-body p {
  margin: 14px 0;
  color: var(--text);
}

.markdown-body strong {
  color: #f4f7fa;
  font-weight: 600;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 24px;
  margin: 14px 0;
}
.markdown-body li {
  margin: 6px 0;
}
.markdown-body li::marker { color: var(--accent); }

.markdown-body code {
  background: var(--bg-elevated);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.88em;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  color: var(--accent);
  border: 1px solid var(--border);
  white-space: nowrap;
}

.markdown-body pre {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 18px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
}
.markdown-body pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--text);
  white-space: pre;
}

.markdown-body blockquote {
  margin: 24px 0;
  padding: 16px 20px;
  border: 1px solid var(--accent-line);
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
}
.markdown-body blockquote p {
  margin: 4px 0;
}
.markdown-body blockquote p:first-child { margin-top: 0; }
.markdown-body blockquote p:last-child { margin-bottom: 0; }

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 56px 0;
}

/* Tables */
.markdown-body table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 24px 0;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: table;
}
.markdown-body thead {
  background: var(--bg-elevated);
}
.markdown-body th,
.markdown-body td {
  padding: 13px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.markdown-body tr:last-child td { border-bottom: none; }
.markdown-body th {
  font-weight: 600;
  color: var(--accent);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.markdown-body tbody tr:hover {
  background: rgba(70, 181, 241, 0.04);
}

/* Wrap tables on small screens */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.markdown-body img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* Screenshot grid */
.screenshot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 24px 0;
}
.screenshot-grid img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.screenshot-grid .caption {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
  padding-bottom: 16px;
}

/* Footer */
.page-footer {
  margin-top: 96px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-dim);
}

/* Scrim */
.scrim {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
  z-index: 90;
  opacity: 0;
  transition: opacity 0.25s;
}
.scrim.open {
  display: block;
  opacity: 1;
}

/* ============ MOBILE ============ */
@media (max-width: 960px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 24px;
  }
  .topbar-inner { padding: 0 24px; }
  .menu-toggle { display: flex; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    max-width: 86vw;
    height: 100vh;
    max-height: 100vh;
    background: var(--bg-soft);
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding: calc(var(--topbar-height) + 16px) 16px 24px;
    z-index: 100;
    overflow-y: auto;
  }
  .sidebar.open { transform: translateX(0); }

  .content {
    padding: 32px 0 60px;
    max-width: 100%;
  }

  .markdown-body h1 { font-size: 30px; }
  .markdown-body h1 + p { font-size: 16px; }
  .markdown-body h2 {
    font-size: 22px;
    margin: 48px 0 16px;
    padding-top: 24px;
  }
  .markdown-body h3 { font-size: 17px; margin: 28px 0 10px; }
  .markdown-body p, .markdown-body li { font-size: 15px; }

  .screenshot-grid { grid-template-columns: 1fr; }

  .markdown-body table {
    font-size: 13px;
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
  .markdown-body th,
  .markdown-body td { padding: 10px 14px; }
}

@media (max-width: 480px) {
  .topbar-inner { padding: 0 16px; }
  .layout { padding: 0 16px; }
  .markdown-body h1 { font-size: 26px; }
  .markdown-body h2 { font-size: 20px; }
  .content { padding: 24px 0 48px; }
}