:root {
  --primary: #0071e3;
  --text: #1d1d1f;
  --text-muted: #86868b;
  --border: #d2d2d7;
  --border-light: #e8e8ed;
  --bg: #ffffff;
  --bg-subtle: #f5f5f7;
  --header-h: 52px;
  --sidebar-w: 260px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* Header */
.docs-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-h);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  z-index: 100;
}

.docs-header .logo {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  text-decoration: none;
  margin-right: 2rem;
  white-space: nowrap;
}

.docs-header nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.docs-header nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

.docs-header nav a:hover {
  color: var(--text);
}

.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header-right a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

.header-right a:hover {
  color: var(--text);
}

/* Layout */
.docs-container {
  display: flex;
  padding-top: var(--header-h);
  min-height: 100vh;
}

/* Sidebar */
.docs-sidebar {
  position: fixed;
  top: var(--header-h);
  left: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--header-h));
  background: var(--bg);
  border-right: 1px solid var(--border-light);
  padding: 1.5rem 1rem;
  overflow-y: auto;
}

.sidebar-section {
  margin-bottom: 1.5rem;
}

.sidebar-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  letter-spacing: 0.05em;
  padding-left: 0.75rem;
}

.sidebar-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-links li {
  margin-bottom: 1px;
}

.sidebar-links a {
  display: block;
  padding: 0.3rem 0.75rem;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.85rem;
  transition: background 0.15s, color 0.15s;
}

.sidebar-links a:hover {
  background: var(--bg-subtle);
  color: var(--text);
}

.sidebar-links a.active {
  background: var(--primary);
  color: white;
}

/* Main Content */
.docs-main {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding: 2.5rem 3rem;
  max-width: 780px;
}

.docs-main h1 {
  font-size: 1.75rem;
  margin: 0 0 1.5rem 0;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.docs-main h2 {
  font-size: 1.3rem;
  margin: 2.5rem 0 1rem 0;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-light);
  font-weight: 600;
}

.docs-main h3 {
  font-size: 1.05rem;
  margin: 1.75rem 0 0.75rem 0;
  font-weight: 600;
}

.docs-main p {
  margin: 0 0 1rem 0;
}

.docs-main ul, .docs-main ol {
  margin: 0 0 1rem 0;
  padding-left: 1.5rem;
}

.docs-main li {
  margin-bottom: 0.35rem;
}

/* Links */
a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Code */
code {
  background: var(--bg-subtle);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85em;
  font-family: var(--font-mono);
  border: 1px solid var(--border-light);
}

pre {
  background: var(--bg-subtle);
  padding: 1rem 1.25rem;
  border-radius: 10px;
  overflow-x: auto;
  border: 1px solid var(--border-light);
  margin: 0 0 1rem 0;
}

pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

th {
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  border-bottom: 2px solid var(--border-light);
}

td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
}

/* Blockquotes */
blockquote {
  border-left: 3px solid var(--primary);
  background: var(--bg-subtle);
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  border-radius: 0 8px 8px 0;
  font-size: 0.95rem;
}

blockquote p {
  margin: 0;
}

/* Info boxes */
.info-box {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin: 1rem 0;
  border-left: 3px solid;
  font-size: 0.9rem;
}

.info-box.note { background: #ddf4ff; border-color: #54aeff; }
.info-box.warning { background: #fff8c5; border-color: #d4a72c; }
.info-box.tip { background: #dafbe1; border-color: #4ac26b; }

/* Section list */
ul.section-list {
  list-style: none;
  padding: 0;
}

ul.section-list li {
  margin-bottom: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-subtle);
  border-radius: 8px;
  border: 1px solid var(--border-light);
  transition: border-color 0.15s;
}

ul.section-list li:hover {
  border-color: var(--border);
}

ul.section-list li a {
  font-weight: 500;
}

/* Footer */
.docs-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  .docs-sidebar { display: none; }
  .docs-main { margin-left: 0; padding: 1.5rem 1rem; }
}