:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1a1a1a;
  --muted: #555;
  --accent: #1a5fb4;
  --accent-hover: #0d4a94;
  --border: #dde1e6;
  --max: 52rem;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.site-header .wrap {
  padding-top: 1rem;
  padding-bottom: 0;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
}

.logo span {
  display: block;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--muted);
  margin-top: 0.2rem;
}

main {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
}

h1 {
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
}

.lead {
  color: var(--muted);
  margin: 0 0 1.5rem;
}

h2 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

h2:first-of-type {
  margin-top: 0;
}

h3 {
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
}

p {
  margin: 0.5rem 0;
}

ul, ol {
  margin: 0.5rem 0 0.75rem;
  padding-left: 1.35rem;
}

li {
  margin: 0.35rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin: 0.75rem 0 1rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #eef2f7;
  font-weight: 600;
}

code, pre {
  font-family: Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

pre {
  background: #f0f2f5;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  overflow-x: auto;
  margin: 0.5rem 0 1rem;
}

.note {
  background: #eef4fc;
  border-left: 4px solid var(--accent);
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  font-size: 0.95rem;
}

.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  margin: 1rem 0;
}

.card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
}

.card h3 {
  margin-top: 0;
  font-size: 1rem;
}

.card a {
  color: var(--accent);
  font-weight: 500;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none;
  padding: 0.45rem 0.9rem;
  border-radius: 4px;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.btn:hover {
  background: var(--accent-hover);
}

.site-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--muted);
}

.site-footer p {
  margin: 0.25rem 0;
}

.toc {
  background: #f8f9fb;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem 0.75rem 2rem;
  margin: 1rem 0 1.5rem;
  font-size: 0.95rem;
}

.toc strong {
  display: block;
  margin-left: -1rem;
  margin-bottom: 0.35rem;
}

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

.expert-ref {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0 0 1rem;
  padding: 0.5rem 0.75rem;
  background: #f8f9fb;
  border-radius: 4px;
}

.app-screenshot {
  margin: 0 0 1.25rem;
  text-align: center;
}

.app-screenshot img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.app-screenshot figcaption {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

/* --- Шапка: логотип + кнопка меню --- */
.site-header .wrap {
  padding-bottom: 0;
}

.header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.header-row .logo {
  flex: 1;
  min-width: 0;
}

.nav-toggle {
  display: none;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-top: 0.1rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle-icon {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  padding: 0.85rem 0 1rem;
  border-top: 1px solid var(--border);
  margin-top: 0.85rem;
}

/* Совместимость: старый селектор nav внутри шапки */
.site-header nav:not(.site-nav) {
  display: flex;
  flex-wrap: wrap;
}

.site-nav a,
.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}

.site-nav a:hover,
.site-header nav a:hover,
.site-nav a.active,
.site-header nav a.active {
  color: var(--accent);
}

.site-nav a.active,
.site-header nav a.active {
  font-weight: 600;
}

/* Таблицы: горизонтальная прокрутка на узких экранах */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0.75rem 0 1rem;
  max-width: 100%;
}

.table-scroll table {
  margin: 0;
  min-width: 36rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.btn-row .btn {
  margin-top: 0;
}

/* Планшет (портрет и малый landscape) */
@media (max-width: 900px) {
  :root {
    --max: 100%;
  }

  .wrap {
    padding-left: 1rem;
    padding-right: 1rem;
    padding-bottom: 2rem;
  }

  main {
    padding: 1.15rem 1.1rem;
  }

  h1 {
    font-size: 1.35rem;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    margin-top: 0.5rem;
    padding: 0;
    border-top: none;
    background: #f8f9fb;
    border: 1px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
  }

  .site-header.nav-open .site-nav {
    display: flex;
  }

  .site-nav a {
    display: block;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .site-nav a:last-child {
    border-bottom: none;
  }

  .site-nav a.active {
    background: #eef4fc;
  }

  .table-scroll table {
    min-width: 32rem;
    font-size: 0.88rem;
  }

  th, td {
    padding: 0.45rem 0.5rem;
  }
}

/* Узкие таблицы на телефоне: карточный вид */
@media (max-width: 520px) {
  .table-scroll {
    overflow-x: visible;
  }

  .table-scroll table {
    min-width: 0;
    display: block;
  }

  .table-scroll thead {
    display: none;
  }

  .table-scroll tbody,
  .table-scroll tr,
  .table-scroll td {
    display: block;
  }

  .table-scroll tr {
    margin-bottom: 0.75rem;
    padding: 0.65rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: #fafbfc;
  }

  .table-scroll td {
    border: none;
    padding: 0.25rem 0;
  }

  .table-scroll td::before {
    content: attr(data-label);
    display: block;
    font-weight: 600;
    font-size: 0.78rem;
    color: var(--muted);
    margin-bottom: 0.15rem;
  }

  .table-scroll td:empty::before {
    display: none;
  }
}

/* Телефон */
@media (max-width: 600px) {
  body {
    font-size: 0.95rem;
  }

  .logo {
    font-size: 1.15rem;
  }

  .logo span {
    font-size: 0.78rem;
    line-height: 1.35;
  }

  main {
    padding: 1rem 0.85rem;
    border-radius: 6px;
  }

  h1 {
    font-size: 1.25rem;
  }

  h2 {
    font-size: 1.05rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .btn {
    display: block;
    width: 100%;
    text-align: center;
    padding: 0.65rem 1rem;
    font-size: 1rem;
  }

  .btn-row {
    flex-direction: column;
  }

  .btn-row .btn {
    width: 100%;
  }

  p .btn + .btn {
    margin-left: 0;
  }

  pre {
    font-size: 0.8rem;
    padding: 0.6rem 0.75rem;
  }

  .toc {
    padding: 0.65rem 0.85rem 0.65rem 1.5rem;
    font-size: 0.9rem;
  }

  .app-screenshot img {
    border-radius: 4px;
  }

  .table-scroll table {
    min-width: 28rem;
    font-size: 0.82rem;
  }
}

/* Широкий планшет / небольшой ноутбук */
@media (min-width: 601px) and (max-width: 900px) {
  .site-nav a {
    padding: 0.65rem 1rem;
  }
}