/* ===== GitHub Docs Style ===== */
:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f6f8fa;
  --color-border: #d0d7de;
  --color-text: #1f2328;
  --color-text-secondary: #656d76;
  --color-link: #0969da;
  --color-link-hover: #0550ae;
  --color-accent: #0969da;
  --sidebar-width: 280px;
  --header-height: 52px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--color-bg);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  z-index: 100;
  overflow-y: auto;
  transition: transform .2s ease, box-shadow .2s ease;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 18px;
}

.logo:hover {
  color: var(--color-link);
}

.logo-icon {
  width: 24px;
  height: 24px;
}

.sidebar-close {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  color: var(--color-text-secondary);
  padding: 4px;
}

.sidebar-close:hover {
  color: var(--color-text);
}

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: 8px;
}

.nav-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--color-text-secondary);
  padding: 8px 16px;
}

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

.nav-link {
  display: block;
  padding: 6px 16px;
  color: var(--color-text);
  text-decoration: none;
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: background .15s, color .15s;
}

.nav-link:hover {
  background: var(--color-bg-secondary);
  color: var(--color-link);
}

.nav-link.active {
  font-weight: 600;
  color: var(--color-link);
  border-left-color: var(--color-accent);
  background: var(--color-bg-secondary);
}

.nav-group-title {
  display: block;
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.nav-sublist {
  padding-left: 12px;
  border-left: 1px solid var(--color-border);
  margin-left: 16px;
  margin-top: 2px;
  margin-bottom: 4px;
}

.nav-sublist .nav-link {
  padding: 4px 12px 4px 8px;
  font-size: 13px;
}

/* ===== Main ===== */
.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.main-header {
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 50;
}

.sidebar-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
}

.sidebar-toggle span {
  display: block;
  height: 2px;
  background: var(--color-text);
}

.search-box {
  flex: 1;
  max-width: 480px;
  display: flex;
  align-items: center;
  gap: 0;
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--color-text-secondary);
  pointer-events: none;
}

.search-box input {
  flex: 1;
  min-width: 0;
  height: 36px;
  padding: 0 12px 0 36px;
  border: none;
  border-radius: var(--radius) 0 0 var(--radius);
  font-size: 14px;
  background: transparent;
}

.search-box input:focus {
  outline: none;
}

.search-box:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, .15);
}

.search-btn {
  height: 36px;
  padding: 0 14px;
  margin: 0;
  border: none;
  border-left: 1px solid var(--color-border);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-bg);
  background: var(--color-accent);
  cursor: pointer;
  white-space: nowrap;
}

.search-btn:hover {
  background: var(--color-link-hover);
}

.search-btn:active {
  opacity: 0.9;
}

/* ===== Content ===== */
.content {
  flex: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  width: 100%;
}

.content h1 {
  font-size: 32px;
  font-weight: 600;
  margin: 0 0 8px;
  line-height: 1.25;
}

.lead {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin: 0 0 24px;
}

.content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 24px 0;
}

.doc-section {
  margin-bottom: 40px;
}

.doc-section h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 32px 0 16px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.doc-section:first-of-type h2 {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.doc-section h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 8px;
}

.content p {
  margin: 0 0 16px;
}

.content ul, .content ol {
  margin: 0 0 16px;
  padding-left: 24px;
}

.content li {
  margin-bottom: 4px;
}

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

.content a:hover {
  text-decoration: underline;
  color: var(--color-link-hover);
}

/* Code */
pre {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
  font-size: 13px;
  line-height: 1.5;
}

code {
  font-family: var(--font-mono);
  font-size: 13px;
}

pre code {
  background: none;
  padding: 0;
}

p code, li code {
  background: var(--color-bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* Callouts */
.callout {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin: 16px 0;
  border-left: 4px solid;
}

.callout-info {
  background: #ddf4ff;
  border-color: #0969da;
  color: #0550ae;
}

.callout-warning {
  background: #fff8c5;
  border-color: #9a6700;
  color: #644000;
}

/* Table */
.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

.doc-table th,
.doc-table td {
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.doc-table th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}

.doc-table code {
  font-size: 12px;
}

.content-footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Overlay */
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 99;
}

.overlay.visible {
  display: block;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0,0,0,.15);
  }

  .sidebar-close {
    display: block;
  }

  .main {
    margin-left: 0;
  }

  .main-header {
    padding: 0 16px;
  }

  .sidebar-toggle {
    display: flex;
  }

  .content {
    padding: 24px 16px 40px;
  }

  .content h1 {
    font-size: 26px;
  }

  .lead {
    font-size: 16px;
  }
}