:root {
  --bg-color: #0d1117;
  --bg-secondary: #161b22;
  --text-main: #c9d1d9;
  --text-muted: #8b949e;
  --accent-color: #ff6b4a; /* Fire orange */
  --accent-hover: #ff856a;
  --border-color: #30363d;
  --sidebar-width: 260px;
  --right-sidebar-width: 240px;
  --header-height: 64px;
  --code-bg: #0d1117;
  --code-border: #30363d;
  --header-bg: rgba(13, 17, 23, 0.8);
  --code-text: #e2e8f0;
}

/* Light theme overrides */
.light-theme {
  --bg-color: #f6f8fa;
  --bg-secondary: #f1f5f9;
  --text-main: #0b1117;
  --text-muted: #546070;
  --accent-color: #d9534f;
  --accent-hover: #e46b66;
  --border-color: #e1e4e8;
  --code-bg: #f5f7fa;
  --code-border: #dfe6ee;
  --header-bg: rgba(255,255,255,0.95);
  --code-text: #0b1117;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Smooth transitions when switching themes */
html, body, .main-container, .content-area, .left-sidebar, .right-sidebar, .top-header {
  transition: background-color 240ms ease, color 240ms ease, border-color 240ms ease;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--accent-color);
}

/* Header */
.top-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background-color: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.logo-icon {
  color: var(--accent-color);
  font-size: 1.5rem;
  text-shadow: 0 0 10px rgba(255, 107, 74, 0.5);
}

.logo-highlight {
  color: var(--accent-color);
}

.header-middle {
  display: flex;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link:hover {
  color: var(--text-main);
}

.nav-chevron {
  font-size: 0.7rem;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent-color), #d9381e);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-download:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255, 107, 74, 0.3);
  color: #fff;
}

/* Language toggle */
.lang-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-weight: 600;
  margin-right: 0.5rem;
  cursor: pointer;
}
.lang-toggle:hover {
  color: var(--text-main);
  border-color: var(--accent-color);
}

/* Theme toggle (reuse small button styles) */
.theme-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-weight: 600;
  margin-right: 0.5rem;
  cursor: pointer;
}
.theme-toggle:hover {
  color: var(--text-main);
  border-color: var(--accent-color);
}

/* Main Layout */
.main-container {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

/* Left Sidebar */
.left-sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  border-right: 1px solid var(--border-color);
  height: calc(100vh - var(--header-height));
  position: fixed;
  top: var(--header-height);
  left: 0;
  overflow-y: auto;
  padding: 2rem 1rem;
  background-color: var(--bg-color);
}

/* Custom Scrollbar for Sidebar */
.left-sidebar::-webkit-scrollbar,
.right-sidebar::-webkit-scrollbar {
  width: 6px;
}
.left-sidebar::-webkit-scrollbar-track,
.right-sidebar::-webkit-scrollbar-track {
  background: transparent;
}
.left-sidebar::-webkit-scrollbar-thumb,
.right-sidebar::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 10px;
}

.sidebar-section {
  margin-bottom: 2rem;
}

.section-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-left: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.section-title:hover {
  color: var(--text-main);
}

.section-title i {
  font-size: 0.7rem;
  transition: transform 0.3s ease;
}

.nav-list {
  list-style: none;
}

.nav-item {
  display: block;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
  transition: all 0.2s;
}

.nav-item:hover {
  background-color: var(--bg-secondary);
  color: var(--text-main);
}

.nav-item.active {
  background-color: rgba(255, 107, 74, 0.1);
  color: var(--accent-color);
  font-weight: 500;
}

/* Content Area */
.content-area {
  flex-grow: 1;
  margin-left: var(--sidebar-width);
  margin-right: var(--right-sidebar-width);
  padding: 3rem 4rem;
  max-width: 900px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.breadcrumb-separator {
  font-size: 0.6rem;
}

.current-page {
  color: var(--accent-color);
  font-weight: 500;
}

/* Document Content */
.document-content {
  animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.intro-text {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
  line-height: 1.7;
}

.intro-text strong {
  color: var(--text-main);
}

.document-content h2 {
  font-size: 1.8rem;
  color: var(--text-main);
  margin: 3rem 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.document-content h2::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 50px;
  height: 2px;
  background-color: var(--accent-color);
}

.document-content h3 {
  font-size: 1.3rem;
  color: var(--text-main);
  margin: 2rem 0 1rem;
}

.document-content p {
  margin-bottom: 1.2rem;
}

.document-content ul {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.document-content li {
  margin-bottom: 0.5rem;
}

.document-content li::marker {
  color: var(--accent-color);
}

/* Code Blocks */
code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.9em;
  background-color: var(--bg-secondary);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

.code-block {
  position: relative;
  background-color: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 1.25rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
}

.code-block code {
  background: transparent;
  padding: 0;
  color: var(--code-text);
  font-size: 0.95rem;
}

/* Tree-style directory example */
.code-block.tree pre {
  background: transparent;
  margin: 0;
  padding: 0;
  white-space: pre;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, 'Roboto Mono', monospace;
  color: var(--text-muted);
  font-size: 0.95rem;
}
.code-block.tree {
  padding: 1rem 1.25rem;
}
.code-block.tree pre code {
  display: block;
}

/* Responsive layout and mobile bottom bar */
@media (max-width: 900px) {
  .left-sidebar, .right-sidebar {
    display: none;
  }

  .content-area {
    margin-left: 0;
    margin-right: 0;
    padding: 1.5rem;
    max-width: none;
    box-sizing: border-box;
  }

  .top-header {
    padding: 0 1rem;
    height: 56px;
  }

  .logo-text {
    font-size: 1rem;
  }

  .logo-icon {
    font-size: 1.25rem;
  }

  .header-middle {
    display: none;
  }

  .header-right {
    display: flex;
    gap: 0.5rem;
    align-items: center;
  }

  .main-container {
    margin-top: 56px;
  }

  .code-block {
    padding: 1rem;
  }
}

/* Very small screens: shorten logo text */
@media (max-width: 420px) {
  .logo-text { display: none; }
  .logo-icon { font-size: 1.5rem; }
}

/* Footer removed - no bottom bar */


.content-area { padding-bottom: 2rem; }


/* Mobile nav open state: show header-middle as dropdown */

@media (max-width: 900px) {
  .menu-toggle { display: inline-flex; }
  .header-middle {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--header-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 200;
    flex-direction: column;
    padding: 1rem;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
  }

  .mobile-nav-open .header-middle {
    display: flex;
  }

  .header-middle a { padding: 0.5rem 0.75rem; border-radius: 6px; }
}

/* Menu toggle style */
.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  margin-right: 0.5rem;
  cursor: pointer;
  align-items: center;
}
.menu-toggle i { font-size: 1rem; }

/* Footer stacking on small screens */
/* Expand mobile breakpoint to include larger iPhones (e.g. iPhone Pro Max) */
@media (max-width: 768px) {
  .top-header {
    height: 56px;
    padding: 0 0.75rem;
  }

  .main-container {
    margin-top: 56px;
  }

  .content-area {
    padding: 1rem;
    margin-left: 0;
    margin-right: 0;
  }

  .page-title { font-size: 1.9rem; }
  .breadcrumbs { font-size: 0.9rem; padding: 0.5rem 0; }

  .header-right { gap: 0.4rem; }
  .btn-download { padding: 0.45rem 0.75rem; font-size: 0.9rem; }

  .logo-icon { font-size: 1.5rem; }
  .logo-text { font-size: 1.05rem; }

  /* Ensure header-middle links are comfortably tappable when opened */
  .header-middle a { padding: 0.75rem 1rem; font-size: 1rem; }
}

@media (max-width: 480px) {
  .page-title { font-size: 1.8rem; }
}


.bottom-item { display: flex; align-items:center; gap:0.5rem; }
.bottom-item strong { color: var(--text-main); font-weight:600; }



.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
  transform: scale(1.05);
}

.copy-btn:active {
  transform: scale(0.95);
}

/* Right Sidebar (TOC) */
.right-sidebar {
  width: var(--right-sidebar-width);
  flex-shrink: 0;
  height: calc(100vh - var(--header-height));
  position: fixed;
  top: var(--header-height);
  right: 0;
  padding: 2rem 1.5rem;
  overflow-y: auto;
}

.toc-container {
  position: sticky;
  top: 2rem;
}

.toc-title {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.toc-line {
  height: 1px;
  background: linear-gradient(to right, var(--accent-color), transparent);
  margin-bottom: 1rem;
}

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

.toc-link {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.3rem 0;
  transition: color 0.2s;
}

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

.toc-sublist {
  list-style: none;
  padding-left: 1rem;
  margin-top: 0.2rem;
  margin-bottom: 0.5rem;
  border-left: 1px solid var(--border-color);
}

.toc-sublist .sub-link {
  padding-left: 0.5rem;
  font-size: 0.8rem;
}

/* Responsive adjustments */
@media (max-width: 1200px) {
  .right-sidebar {
    display: none;
  }
  .content-area {
    margin-right: 0;
  }
}

@media (max-width: 900px) {
  .left-sidebar {
    transform: translateX(-100%);
    z-index: 10;
  }
  .content-area {
    margin-left: 0;
    padding: 2rem;
  }
  .header-middle {
    display: none;
  }
}