@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300 600;
  font-display: swap;
  src: local('Inter Light'), local('Inter-Regular'), local('Inter Medium'), local('Inter SemiBold'), local('-apple-system'), local('BlinkMacSystemFont'), local('Segoe UI'), local('Roboto'), local('Helvetica Neue'), local('Arial');
}

:root {
  --bg-main: #f0f4f8;
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --text-main: #1a202c;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --accent: #6366f1;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --code-bg: #1e293b;
  --code-text: #e2e8f0;
  --shadow: 0 10px 40px -10px rgba(99, 102, 241, 0.3);
  --shadow-hover: 0 20px 50px -10px rgba(99, 102, 241, 0.4);
}

html[data-theme="dark"] {
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --bg-sidebar: #1e293b;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --accent: #818cf8;
  --accent-gradient: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --shadow: 0 10px 40px -10px rgba(129, 140, 248, 0.3);
  --shadow-hover: 0 20px 50px -10px rgba(129, 140, 248, 0.4);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-main);
  color: var(--text-main);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
  border: 2px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-corner {
  background: transparent;
}

html[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: #475569;
}

html[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

.container {
  display: flex;
  height: 100vh;
}

.content {
  flex: 1;
  padding: 48px;
  overflow-y: auto;
  min-width: 0;
}

.sidebar {
  width: 320px;
  padding: 32px 24px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  position: relative;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 24px;
}

.sidebar h1 {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--accent);
}

.sidebar p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
}

.theme-toggle {
  position: absolute;
  top: 0;
  right: 0;
  border: 2px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 999px;
  padding: 8px 16px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--accent);
  color: white;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
}

.sidebar-nav a {
  display: block;
  padding: 8px 12px;
  margin-bottom: 4px;
  text-decoration: none;
  font-size: 14px;
  color: var(--text-main);
  border-radius: 8px;
  transition: all .2s ease;
  border: 1px solid transparent;
}

.sidebar-nav a:hover {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent);
  border-color: rgba(99, 102, 241, 0.2);
}

.sidebar-nav a.active {
  background: var(--accent-gradient);
  color: white;
  font-weight: 600;
}

.sidebar-nav a.active::before {
  display: none;
}

details summary {
  cursor: pointer;
  font-weight: 600;
  margin-bottom: 4px;
  list-style: none;
  padding: 8px 12px;
  background: var(--bg-main);
  border-radius: 8px;
  color: var(--text-main);
  transition: all .2s ease;
}

details summary:hover {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent);
}

details summary::-webkit-details-marker {
  display: none;
}

details a {
  padding-left: 20px;
  font-size: 13px;
  color: var(--text-muted);
  border-left: 2px solid var(--border-color);
  margin-left: 8px;
  padding: 6px 12px;
  margin-bottom: 2px;
  display: block;
}

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

.search-box {
  margin-bottom: 16px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 10px 12px 10px 36px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 14px;
  transition: all .2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
}

.global-search-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.global-search-btn:hover {
  background: rgba(99, 102, 241, 0.08);
  color: var(--accent);
  border-color: var(--accent);
}

.kbd-shortcut {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  font-size: 11px;
  font-weight: 600;
  background: var(--bg-main);
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.post {
  background: var(--bg-card);
  padding: 48px;
  border-radius: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.post:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.post p {
  line-height: 1.8;
  margin-bottom: 1em;
  font-size: 16px;
}

.post em {
  color: var(--text-muted);
  font-style: italic;
}

.post strong {
  color: var(--text-main);
  font-weight: 600;
  font-size: 1.18em;
  letter-spacing: 0.03em;
}

.post h1 {
  font-size: 2.5em;
  color: var(--accent);
  margin-bottom: 0.5em;
  line-height: 1.2;
}

.post h2 {
  font-size: 1.8em;
  color: var(--text-main);
  margin-top: 1.5em;
  margin-bottom: 0.8em;
  padding-bottom: 0.3em;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.post h3 {
  font-size: 1.4em;
  color: var(--text-main);
  margin-top: 1.2em;
  margin-bottom: 0.6em;
}

.post h4 {
  font-size: 1.1em;
  color: var(--accent);
  margin-top: 1em;
  margin-bottom: 0.5em;
}

.post pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 20px;
  border-radius: 12px;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.3);
  position: relative;
}

.post :not(pre) > code {
  font-family: 'Fira Code', 'Monaco', 'Consolas', monospace;
  font-size: 14px;
  color: #8b5cf6;
  background: rgba(139, 92, 246, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
  transition: all .2s ease;
}

.post :not(pre) > code:hover {
  background: rgba(139, 92, 246, 0.25) !important;
}

.post :not(pre) > code:active {
  transform: scale(0.95);
}

.post :not(pre) > code.copied {
  color: #dc2626 !important;
  background: rgba(220, 38, 38, 0.15) !important;
  font-weight: bold !important;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 6px 12px;
  font-size: 14px;
  border: none;
  border-radius: 8px;
  background: rgba(0,0,0,.55);
  color: #fff;
  cursor: pointer;
  opacity: 0;
  transition: opacity .2s ease;
}

.post pre:hover .copy-btn {
  opacity: 1;
}

html[data-theme="dark"] .copy-btn {
  background: rgba(255,255,255,.15);
}

.post pre.folded {
  max-height: 292px;
  overflow: hidden;
  position: relative;
}

.code-toggle {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  margin-top: -8px;
  cursor: pointer;
  color: var(--text-muted);
  background: transparent;
  border: 1px dashed var(--border-color);
  border-radius: 4px;
  user-select: none;
  transition: all .2s ease;
}

.code-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.post a {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: all .2s ease;
  padding-bottom: 1px;
}

.post a:hover {
  filter: brightness(1.2);
  border-bottom-color: var(--accent);
}

html[data-theme="dark"] .post a:hover {
  filter: brightness(1.1);
}

.post blockquote {
  margin: 20px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: rgba(99, 102, 241, 0.08);
  border-radius: 0 8px 8px 0;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

.post blockquote p {
  margin-bottom: 0;
}

html[data-theme="dark"] .post blockquote {
  background: rgba(129, 140, 248, 0.12);
}

.post table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.post th,
.post td {
  border: none;
  padding: 14px 16px;
  text-align: left;
}

.post th {
  background: var(--accent-gradient);
  color: white;
  font-weight: 600;
}

.post tr {
  border-bottom: 1px solid var(--border-color);
}

.post tr:last-child {
  border-bottom: none;
}

.post tr:nth-child(even) {
  background: rgba(0, 0, 0, 0.02);
}

.post tr:hover {
  background: rgba(99, 102, 241, 0.05);
}

html[data-theme="dark"] .post tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.04);
}

html[data-theme="dark"] .post tr:hover {
  background: rgba(129, 140, 248, 0.1);
}

.post img {
  loading: lazy;
  transition: opacity .3s ease;
}

.post img:not([src]) {
  opacity: 0;
}

.post img.loaded {
  opacity: 1;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-muted);
}

.breadcrumb-item {
  color: var(--accent);
  cursor: pointer;
}

.breadcrumb-item:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--text-muted);
}

.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: white;
  border: none;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all .3s ease;
  box-shadow: var(--shadow);
  z-index: 999;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255,255,255,.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s, visibility .3s;
}

.loading-overlay.show {
  opacity: 1;
  visibility: visible;
}

html[data-theme="dark"] .loading-overlay {
  background: rgba(15, 23, 42, .9);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent-gradient);
  width: 0%;
  z-index: 1001;
  transition: width .1s;
}

.global-search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2000;
  display: none;
  opacity: 0;
  transition: opacity .2s ease;
}

.global-search-modal.show {
  display: block;
  opacity: 1;
}

.global-search-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.global-search-dialog {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 600px;
  max-height: 70vh;
  background: var(--bg-card);
  border-radius: 16px;
  box-shadow: var(--shadow-hover);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.global-search-header {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  gap: 12px;
}

.global-search-header svg {
  color: var(--text-muted);
  flex-shrink: 0;
}

.global-search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 16px;
  color: var(--text-main);
  outline: none;
}

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

.global-search-results {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  max-height: 400px;
}

.global-search-item {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 14px;
  transition: all .15s ease;
  cursor: pointer;
}

.global-search-item:hover,
.global-search-item.highlighted {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent);
}

.search-item-title {
  font-weight: 500;
  margin-bottom: 4px;
}

.search-item-snippet {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}

.search-highlight {
  background: #ede9fe;
  color: #5b21b6;
  border: 1px solid #c4b5fd;
  border-radius: 4px;
  padding: 1px 4px;
  box-shadow: 0 2px 4px rgba(139, 92, 246, 0.15);
  font-weight: 500;
}

html[data-theme="dark"] .search-highlight {
  background: #1e1b4b;
  color: #c4b5fd;
  border-color: #6d28d9;
  box-shadow: 0 2px 4px rgba(139, 92, 246, 0.25);
}

.search-mark {
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent);
  padding: 0 2px;
  border-radius: 2px;
}

html[data-theme="dark"] .search-mark {
  background: rgba(129, 140, 248, 0.2);
}

.global-search-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  padding: 12px 20px;
  border-top: 1px solid var(--border-color);
  font-size: 12px;
  color: var(--text-muted);
}

.global-search-footer kbd {
  display: inline-block;
  padding: 2px 6px;
  font-size: 11px;
  font-family: inherit;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-right: 4px;
}

.global-search-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}

.toc-sidebar {
  width: 220px;
  padding: 32px 16px;
  background: var(--bg-sidebar);
  border-left: 1px solid var(--border-color);
  display: none;
  flex-shrink: 0;
}

.toc-sidebar .toc {
  position: sticky;
  top: 32px;
}

.toc-sidebar .toc-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.toc-sidebar .toc-item {
  margin-bottom: 2px;
}

.toc-sidebar .toc-link {
  display: block;
  padding: 5px 10px;
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 4px;
  transition: all .2s ease;
  border-left: 2px solid transparent;
  padding-left: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-sidebar .toc-link:hover {
  color: var(--accent);
  background: rgba(99, 102, 241, 0.08);
}

.toc-sidebar .toc-link.active {
  color: var(--accent);
  background: rgba(99, 102, 241, 0.12);
  border-left-color: var(--accent);
  font-weight: 500;
}

.toc-sidebar .toc-link[data-level="2"] {
  padding-left: 20px;
}

.toc-sidebar .toc-link[data-level="3"] {
  padding-left: 28px;
  font-size: 12px;
}

.toc-sidebar .toc-link[data-level="4"] {
  padding-left: 36px;
  font-size: 12px;
}

.last-updated {
  margin-top: 24px;
  padding: 12px 16px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
  opacity: 0;
  transition: opacity .3s ease;
}

.last-updated.show {
  opacity: 1;
}

.menu-toggle {
  display: none;
  background: var(--accent-gradient);
  border: none;
  color: white;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.menu-toggle:hover {
  box-shadow: var(--shadow-hover);
}

@media (max-width: 768px) {
  body { overflow-x: hidden; }
  body.sidebar-open { overflow: hidden; height: 100vh; }

  .container {
    display: block;
  }

  .menu-toggle {
    display: block;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 1100;
    font-size: 20px;
    padding: 10px 14px;
    border-radius: 10px;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: 300px;
    transform: translateX(-100%);
    transition: transform .3s ease;
    z-index: 1000;
    box-shadow: var(--shadow);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .content {
    padding: 20px;
  }

  .post {
    padding: 24px;
  }

  .post p {
    font-size: 15px;
    line-height: 1.7;
  }

  .post h1 {
    font-size: 2em;
  }

  .post h2 {
    font-size: 1.5em;
  }

  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
  }

  .search-box {
    display: block;
    margin-bottom: 12px;
  }

  .search-box .search-input {
    font-size: 16px;
    padding: 12px 44px 12px 36px;
  }

  .global-search-btn {
    display: flex;
  }

  .kbd-shortcut {
    display: none;
  }

  .toc-sidebar {
    display: none !important;
  }

  .global-search-dialog {
    top: 5%;
    width: 95%;
    max-height: 80vh;
  }

  .global-search-footer {
    flex-wrap: wrap;
    gap: 8px;
  }
}

@media (min-width: 1200px) {
  .toc-sidebar {
    display: block;
  }
}