:root {
  --bg-marketing: #08090a; --bg-panel: #0f1011; --bg-surface: #191a1b;
  --bg-card: rgba(255,255,255,0.02);
  --text-primary: #f7f8f8; --text-secondary: #d0d6e0;
  --text-tertiary: #8a8f98; --text-quaternary: #62666d;
  --accent: #5e6ad2; --accent-hover: #7170ff; --accent-light: #828fff;
  --success: #10b981;
  --border-subtle: rgba(255,255,255,0.05); --border-standard: rgba(255,255,255,0.08);
  --border-prominent: rgba(255,255,255,0.12);
  /* Reader dark mode */
  --reader-bg: #08090a;
  --reader-surface: #0f1011;
  --reader-surface-2: #191a1b;
  --reader-text: #f7f8f8;
  --reader-text-secondary: #d0d6e0;
  --reader-text-tertiary: #8a8f98;
  --reader-border: rgba(255,255,255,0.08);
  --reader-border-strong: rgba(255,255,255,0.12);
  --reader-code-bg: rgba(255,255,255,0.04);
  --reader-link: #828fff;
  --reader-blockquote-border: rgba(255,255,255,0.12);
  --reader-divider: rgba(255,255,255,0.06);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-marketing); color: var(--text-primary);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-feature-settings: 'cv01', 'ss03';
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  transition: background-color 0.2s;
}
body.reader-mode { background: var(--reader-bg); }
body.index-mode { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }
#index-page { display: contents; }
.sidebar {
  position: sticky; top: 0; height: 100vh;
  background: var(--bg-panel); border-right: 1px solid var(--border-subtle);
  padding: 24px 20px; overflow-y: auto; display: flex; flex-direction: column;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 28px; padding-bottom: 20px;
  border-bottom: 1px solid var(--border-subtle);
  cursor: pointer; text-decoration: none; color: inherit;
}
.logo-icon {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  border-radius: 6px; display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace; font-weight: 600; font-size: 13px; color: white;
}
.logo-text { font-size: 14px; font-weight: 500; }
.logo-version {
  margin-left: auto; font-family: 'JetBrains Mono', monospace;
  font-size: 11px; color: var(--text-quaternary);
  padding: 2px 6px; border: 1px solid var(--border-subtle); border-radius: 4px;
}
.search-box { position: relative; margin-bottom: 20px; }
.search-input {
  width: 100%; background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle); border-radius: 6px;
  padding: 8px 12px 8px 32px; color: var(--text-primary);
  font-family: inherit; font-size: 13px; outline: none; transition: border-color 0.15s;
}
.search-input:focus { border-color: var(--accent); }
.search-input::placeholder { color: var(--text-quaternary); }
.search-icon {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  width: 14px; height: 14px; color: var(--text-quaternary);
}
.kbd-hint {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  color: var(--text-quaternary); padding: 2px 5px;
  border: 1px solid var(--border-subtle); border-radius: 3px; background: var(--bg-surface);
}
.nav-section { margin-bottom: 8px; }
.nav-label {
  font-size: 10px; font-weight: 500; letter-spacing: 0.5px;
  text-transform: uppercase; color: var(--text-quaternary);
  padding: 0 8px; margin-bottom: 8px;
}
.nav-link {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 8px; border-radius: 4px;
  color: var(--text-secondary); text-decoration: none;
  font-size: 13px; font-weight: 400; transition: all 0.1s; cursor: pointer;
}
.nav-link:hover { background: rgba(255,255,255,0.04); color: var(--text-primary); }
.nav-num { font-family: 'JetBrains Mono', monospace; font-size: 11px; color: var(--text-quaternary); min-width: 22px; }
.sidebar-footer {
  margin-top: auto; padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
  font-size: 11px; color: var(--text-quaternary); font-family: 'JetBrains Mono', monospace;
}
.sidebar-footer .stat { display: flex; justify-content: space-between; padding: 4px 0; }
.sidebar-footer .stat-value { color: var(--text-secondary); }
.main { padding: 0 64px 80px; max-width: 1200px; }
.hero { padding: 80px 0 64px; border-bottom: 1px solid var(--border-subtle); margin-bottom: 64px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; background: rgba(94,106,210,0.1);
  border: 1px solid rgba(94,106,210,0.3); border-radius: 9999px;
  font-size: 12px; font-weight: 500; color: var(--accent-light); margin-bottom: 24px;
}
.hero-badge .dot {
  width: 6px; height: 6px; background: var(--accent-light);
  border-radius: 50%; animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero h1 {
  font-size: 64px; font-weight: 500; line-height: 1.0;
  letter-spacing: -1.408px; margin-bottom: 20px; color: var(--text-primary);
}
.hero h1 .accent {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero-subtitle {
  font-size: 18px; line-height: 1.6; color: var(--text-tertiary);
  max-width: 640px; margin-bottom: 32px; letter-spacing: -0.165px;
}
.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--border-subtle); border: 1px solid var(--border-subtle);
  border-radius: 12px; overflow: hidden; max-width: 720px;
}
.hero-stat { background: var(--bg-panel); padding: 20px 24px; }
.hero-stat-value {
  font-size: 28px; font-weight: 500; letter-spacing: -0.5px;
  color: var(--text-primary); font-feature-settings: 'tnum';
}
.hero-stat-label {
  font-size: 12px; color: var(--text-tertiary); margin-top: 4px;
  text-transform: uppercase; letter-spacing: 0.3px;
}
.part-section { margin-bottom: 72px; scroll-margin-top: 24px; }
.part-header {
  display: flex; align-items: baseline; gap: 16px;
  margin-bottom: 28px; padding-bottom: 16px; border-bottom: 1px solid var(--border-subtle);
}
.part-label {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  color: var(--accent-light); font-weight: 500; letter-spacing: 0.5px;
}
.part-title {
  font-size: 32px; font-weight: 500; letter-spacing: -0.704px;
  line-height: 1.13; color: var(--text-primary); flex: 1;
}
.part-count {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  color: var(--text-tertiary); padding: 4px 10px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border-subtle);
  border-radius: 9999px;
}
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 12px; }
.card {
  display: block; background: var(--bg-card);
  border: 1px solid var(--border-standard); border-radius: 8px;
  padding: 20px; text-decoration: none; color: inherit;
  transition: all 0.15s ease; position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0; transition: opacity 0.2s;
}
.card:hover {
  background: rgba(255,255,255,0.04); border-color: var(--border-prominent);
  transform: translateY(-1px);
}
.card:hover::before { opacity: 1; }
.card.hidden { display: none; }
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.card-num {
  font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 500;
  color: var(--text-quaternary); letter-spacing: 0.3px;
}
.card-badge {
  font-family: 'JetBrains Mono', monospace; font-size: 10px;
  color: var(--text-tertiary); padding: 2px 6px;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border-subtle);
  border-radius: 3px;
}
.card-title {
  font-size: 16px; font-weight: 500; color: var(--text-primary);
  margin-bottom: 8px; line-height: 1.4; letter-spacing: -0.15px;
}
.card-desc {
  font-size: 13px; color: var(--text-tertiary);
  line-height: 1.5; margin-bottom: 16px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-footer { display: flex; justify-content: flex-end; }
.card-link {
  font-size: 12px; font-weight: 500; color: var(--accent-light);
  opacity: 0; transition: opacity 0.15s;
}
.card:hover .card-link { opacity: 1; }
.no-results { text-align: center; padding: 80px 20px; color: var(--text-tertiary); display: none; }
.no-results.visible { display: block; }
.reader { display: none; background: var(--reader-bg); color: var(--reader-text); min-height: 100vh; }
.reader.visible { display: block; }
.reader-topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(8,9,10,0.85);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--reader-border);
}
.reader-topbar-inner {
  max-width: 1400px; margin: 0 auto; padding: 14px 32px;
  display: flex; align-items: center; gap: 16px;
}
.back-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 6px;
  border: 1px solid var(--reader-border); background: var(--reader-surface-2);
  color: var(--reader-text); text-decoration: none;
  font-size: 13px; font-weight: 500; cursor: pointer; transition: all 0.15s;
}
.back-btn:hover { background: var(--reader-surface); border-color: #d0d6e0; }
.reader-breadcrumbs {
  font-size: 13px; color: var(--reader-text-secondary);
  flex: 1; display: flex; align-items: center; gap: 8px;
}
.reader-breadcrumbs .crumb-num {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  padding: 2px 6px; background: var(--reader-surface-2);
  border: 1px solid var(--reader-border); border-radius: 3px; color: var(--reader-text);
}
.reader-breadcrumbs .crumb-divider {
  color: var(--reader-text-tertiary); margin: 0 2px;
}
.reader-breadcrumbs .crumb-part,
.reader-breadcrumbs .crumb-time {
  color: var(--reader-text-secondary); font-size: 12px;
}
.reader-breadcrumbs .crumb-time {
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
}
.reader-toc-toggle {
  padding: 6px 12px; border-radius: 6px;
  border: 1px solid var(--reader-border); background: var(--reader-surface-2);
  font-size: 13px; font-weight: 500; cursor: pointer; color: var(--reader-text);
}
.reader-toc-toggle:hover { background: var(--reader-surface); }
.reader-layout {
  max-width: 1400px; margin: 0 auto; padding: 48px 32px 120px;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  grid-template-areas: 'toc content';
  gap: 64px;
  align-items: start;
  transition: grid-template-columns 0.25s ease, gap 0.25s ease;
}
.reader-layout .reader-toc { grid-area: toc; }
.reader-layout .reader-content { grid-area: content; }
.reader-layout.toc-hidden {
  grid-template-columns: 0px minmax(0, 1fr);
  grid-template-areas: '. content';
  gap: 0;
}
.reader-layout.toc-hidden .reader-toc { display: none; }
.reader-toc {
  position: sticky; top: 70px;
  max-height: calc(100vh - 100px); overflow-y: auto;
  font-size: 13px;
}
.reader-toc-label {
  font-size: 11px; font-weight: 600; letter-spacing: 0.5px;
  text-transform: uppercase; color: var(--reader-text-secondary); margin-bottom: 12px;
}
.reader-toc ul { list-style: none; padding: 0; }
.reader-toc li { margin-bottom: 4px; }
.reader-toc a {
  display: block; padding: 4px 8px;
  color: var(--reader-text-secondary); text-decoration: none;
  border-radius: 4px; line-height: 1.4; transition: all 0.1s;
}
.reader-toc a:hover { background: var(--reader-surface); color: var(--reader-text); }
.reader-toc a.active { color: var(--reader-link); background: rgba(0,112,243,0.05); }
.reader-toc .lvl-3 { padding-left: 16px; font-size: 12px; }
.reader-content {
  max-width: 760px; font-size: 16px; line-height: 1.7; color: var(--reader-text);
  justify-self: center; width: 100%;
}
.reader-layout:not(.toc-hidden) .reader-content { justify-self: stretch; }
.reader-content h1 {
  font-size: 48px; font-weight: 700; line-height: 1.1;
  letter-spacing: -1.5px; margin-bottom: 16px; color: var(--reader-text);
}
.reader-content > blockquote:first-of-type {
  font-size: 18px; line-height: 1.6; color: var(--reader-text-secondary);
  border-left: 3px solid var(--reader-blockquote-border);
  padding: 4px 0 4px 20px; margin: 0 0 48px;
  font-weight: 400;
}
.reader-content h2 {
  font-size: 32px; font-weight: 700; letter-spacing: -0.8px;
  line-height: 1.2; margin: 56px 0 16px; padding-top: 16px;
  border-top: 1px solid var(--reader-border); scroll-margin-top: 80px;
}
.reader-content h2:first-of-type { border-top: none; padding-top: 0; margin-top: 32px; }
.reader-content h3 {
  font-size: 22px; font-weight: 600; letter-spacing: -0.3px;
  line-height: 1.3; margin: 36px 0 12px; scroll-margin-top: 80px;
}
.reader-content h4 { font-size: 17px; font-weight: 600; margin: 24px 0 8px; }
.reader-content p { margin-bottom: 16px; }
.reader-content a {
  color: var(--reader-link); text-decoration: none;
  border-bottom: 1px solid rgba(0,112,243,0.3);
}
.reader-content a:hover { border-bottom-color: var(--reader-link); }
.reader-content strong { font-weight: 600; color: var(--reader-text); }
.reader-content em { font-style: italic; }
.reader-content ul, .reader-content ol { margin: 16px 0; padding-left: 28px; }
.reader-content li { margin-bottom: 6px; }
.reader-content li > code, .reader-content p > code {
  font-family: 'JetBrains Mono', monospace; font-size: 0.88em;
  padding: 2px 6px; background: var(--reader-code-bg);
  border: 1px solid var(--reader-border); border-radius: 4px; color: var(--reader-text);
}
.reader-content pre {
  margin: 20px 0; border-radius: 8px; overflow: hidden;
  border: 1px solid var(--reader-border); background: #1a1d23;
}
.reader-content pre code {
  display: block; padding: 16px 20px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px; line-height: 1.6; overflow-x: auto;
  background: transparent !important;
}
.reader-content pre code::-webkit-scrollbar { height: 6px; }
.reader-content pre code::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 3px; }
.code-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 16px; background: #14171c;
  border-bottom: 1px solid #2a2e36;
  font-family: 'JetBrains Mono', monospace; font-size: 11px;
  color: rgba(255,255,255,0.6); text-transform: uppercase; letter-spacing: 0.5px;
  border-radius: 8px 8px 0 0;
}
.code-header + pre {
  margin-top: 0;
  border-top: none;
  border-radius: 0 0 8px 8px;
}
.copy-btn {
  background: transparent; border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.7); padding: 3px 8px;
  border-radius: 4px; font-family: 'JetBrains Mono', monospace;
  font-size: 10px; cursor: pointer;
  text-transform: uppercase; letter-spacing: 0.5px; transition: all 0.15s;
}
.copy-btn:hover { background: rgba(255,255,255,0.08); color: white; }
.copy-btn.copied { background: var(--success); border-color: var(--success); color: white; }
.reader-content blockquote {
  margin: 20px 0; padding: 4px 20px;
  border-left: 3px solid var(--reader-blockquote-border);
  color: var(--reader-text-secondary); font-style: italic;
}
.reader-content blockquote p { margin-bottom: 8px; }
.reader-content table {
  width: 100%; border-collapse: collapse;
  margin: 20px 0; font-size: 14px;
  border: 1px solid var(--reader-border); border-radius: 6px; overflow: hidden;
}
.reader-content thead { background: var(--reader-surface); }
.reader-content th {
  text-align: left; padding: 10px 14px;
  font-weight: 600; border-bottom: 1px solid var(--reader-border);
}
.reader-content td {
  padding: 10px 14px; border-bottom: 1px solid var(--reader-border); vertical-align: top;
}
.reader-content tr:last-child td { border-bottom: none; }
.reader-content tr:nth-child(even) { background: var(--reader-surface); }
.reader-content hr { margin: 40px 0; border: none; border-top: 1px solid var(--reader-border); }
.reader-content img { max-width: 100%; border-radius: 6px; margin: 16px 0; }

/* GFM Task Lists (чек-листы) */
.reader-content ul.contains-task-list { list-style: none; padding-left: 8px; }
.reader-content .task-list-item { padding: 6px 0; display: flex; align-items: flex-start; gap: 10px; line-height: 1.6; }
.reader-content .task-list-item input[type="checkbox"] {
  appearance: none; -webkit-appearance: none; -moz-appearance: none;
  width: 18px; height: 18px; min-width: 18px; margin: 3px 10px -3px 0px;
  border: 1.5px solid var(--text-quaternary);
  border-radius: 4px;
  background: var(--reader-surface);
  cursor: pointer; position: relative;
  transition: all 0.15s ease;
}
.reader-content .task-list-item input[type="checkbox"]:hover { border-color: var(--accent-light); }
.reader-content .task-list-item input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}
.reader-content .task-list-item input[type="checkbox"]:checked::after {
  content: ''; position: absolute;
  left: 4px; top: 1px; width: 5px; height: 9px;
  border: solid white; border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.reader-content .task-list-item:has(input:checked) {
  color: var(--reader-text-tertiary);
}
.reader-content .task-list-item:has(input:checked) .task-list-text,
.reader-content .task-list-item:has(input:checked) { text-decoration: line-through; text-decoration-color: var(--text-quaternary); }

/* Стилизация контейнера чек-листа */
.reader-content h2:has(+ p + ul.contains-task-list),
.reader-content h3:has(+ p + ul.contains-task-list) {
  margin-bottom: 8px;
}
.reader-content ul.contains-task-list {
  background: var(--reader-surface);
  border: 1px solid var(--reader-border);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 12px 0;
}
.reader-content ul.contains-task-list .task-list-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--reader-border);
}
.reader-content ul.contains-task-list .task-list-item:last-child {
  border-bottom: none;
}
.reading-progress {
  position: fixed; top: 0; left: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  width: 0%; z-index: 200; transition: width 0.1s, opacity 0.2s;
  opacity: 0;
  pointer-events: none;
}
body.reader-mode .reading-progress { opacity: 1; }
.reader-nav-bottom {
  margin-top: 80px; padding-top: 32px;
  border-top: 1px solid var(--reader-border);
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.reader-nav-link {
  display: flex; flex-direction: column;
  padding: 16px 20px; border: 1px solid var(--reader-border);
  border-radius: 8px; text-decoration: none;
  color: var(--reader-text); transition: all 0.15s;
}
.reader-nav-link:hover { border-color: var(--reader-text); background: var(--reader-surface); }
.reader-nav-link.next { text-align: right; }
.reader-nav-link.disabled { opacity: 0.4; pointer-events: none; }
.reader-nav-label {
  font-size: 11px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--reader-text-secondary); margin-bottom: 4px;
}
.reader-nav-title { font-size: 14px; font-weight: 600; }
@media (max-width: 1200px) {
  .reader-layout { grid-template-columns: 1fr 220px; gap: 48px; }
  .reader-toc { display: none !important; }
}
@media (max-width: 1024px) {
  body.index-mode { grid-template-columns: 220px 1fr; }
  .main { padding: 0 32px 60px; }
  .hero h1 { font-size: 48px; letter-spacing: -1.056px; }
}
@media (max-width: 768px) {
  body.index-mode { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; border-right: none; border-bottom: 1px solid var(--border-subtle); }
  .nav-section { display: none; }
  .main { padding: 0 20px 40px; }
  .hero { padding: 40px 0 32px; }
  .hero h1 { font-size: 36px; letter-spacing: -0.8px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .cards-grid { grid-template-columns: 1fr; }
  .part-title { font-size: 24px; }
  .reader-layout { grid-template-columns: 1fr; padding: 32px 20px; }
  .reader-content h1 { font-size: 36px; }
  .reader-content h2 { font-size: 24px; }
}
::selection { background: var(--accent); color: white; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
.reader ::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 4px; }
.reader ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.15); }