/* ProgGuide — светлая тема с инженерным характером:
   моноширинные акценты, код как в редакторе, чертёжная сетка. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-code: #f6f8fa;
  --surface: #ffffff;
  --border: #d8dee4;
  --border-soft: #e8ecf0;

  --text: #1f2328;
  --text-soft: #59636e;
  --muted: #656d76;    /* 5.25 контраст на белом — проходит WCAG AA для мелкого текста */

  --accent: #0969da;         /* синий как ссылки в редакторе */
  --accent-dark: #0550ae;
  --accent-soft: #ddf4ff;

  --ok: #1a7f37;
  --ok-soft: #dafbe1;
  --err: #cf222e;
  --warn: #9a6700;
  --warn-soft: #fff8c5;

  /* подсветка синтаксиса, светлая схема */
  --code-key: #cf222e;
  --code-str: #0a3069;
  --code-com: #6e7781;

  --radius: 10px;
  --wrap: 1120px;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1 { font-size: 2.05rem; line-height: 1.25; margin: 32px 0 16px; letter-spacing: -0.02em; font-weight: 700; }
h2 { font-size: 1.4rem; line-height: 1.35; margin: 40px 0 14px; letter-spacing: -0.01em; font-weight: 650; }
h3 { font-size: 1.12rem; margin: 28px 0 10px; font-weight: 650; }
p { margin: 0 0 14px; }

/* Заголовки разделов статьи — с решёткой, как якорь в коде */
.article h2::before {
  content: "#";
  color: var(--accent);
  font-family: var(--mono);
  font-weight: 400;
  margin-right: 8px;
  opacity: .55;
}

.lead { font-size: 1.08rem; color: var(--text-soft); max-width: 780px; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

/* ---------- Шапка ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.header-inner { display: flex; align-items: center; gap: 24px; height: 60px; }
.logo {
  font-weight: 700; color: var(--text); font-size: 1.05rem; white-space: nowrap;
  font-family: var(--mono); letter-spacing: -0.03em;
}
.logo::before { content: "</>"; color: var(--accent); margin-right: 7px; font-weight: 500; }
.logo:hover { text-decoration: none; color: var(--accent); }
.nav { display: flex; gap: 22px; flex: 1; overflow-x: auto; }
.nav a { color: var(--text-soft); font-size: 0.94rem; white-space: nowrap; }
.nav a:hover { color: var(--accent); text-decoration: none; }
.header-cta { white-space: nowrap; }

/* ---------- Хлебные крошки ---------- */
.breadcrumbs-bar { border-bottom: 1px solid var(--border-soft); background: var(--bg-soft); }
.breadcrumbs {
  display: flex; flex-wrap: wrap; gap: 8px; padding: 9px 0;
  font-size: 0.82rem; color: var(--muted); font-family: var(--mono);
}
.breadcrumbs a { color: var(--text-soft); }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs .sep { color: #c3cbd4; }

/* ---------- Кнопки ---------- */
.btn {
  display: inline-block; padding: 10px 20px; border-radius: 8px;
  font-weight: 600; font-size: 0.95rem; border: 1px solid transparent;
  cursor: pointer; transition: background .15s, border-color .15s, box-shadow .15s;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 1px 2px rgba(31, 35, 40, .12); }
.btn-primary:hover { background: var(--accent-dark); }
.btn-primary:disabled { opacity: .55; cursor: not-allowed; }
.btn-ghost { border-color: var(--border); color: var(--text); background: #fff; }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 6px 14px; font-size: 0.86rem; background: var(--accent); color: #fff; border-radius: 7px; }
.btn-sm:hover { background: var(--accent-dark); }

/* ---------- Главный экран ---------- */
.hero {
  padding: 34px 0 10px;
  position: relative;
}
/* чертёжная сетка на фоне первого экрана */
.hero::before {
  content: "";
  position: absolute; inset: -20px -40px auto -40px; height: 340px; z-index: -1;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.5), transparent 85%);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,.5), transparent 85%);
  pointer-events: none;
}
.hero h1 { max-width: 900px; font-size: 2.4rem; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 26px 0 8px; }
.hero-stats {
  display: flex; gap: 40px; flex-wrap: wrap;
  margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--border-soft);
}
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 1.65rem; line-height: 1.2; font-family: var(--mono); color: var(--accent); }
.hero-stats span { color: var(--muted); font-size: 0.86rem; }

/* ---------- Карточки ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; margin: 18px 0 8px; }
.card {
  display: flex; flex-direction: column; gap: 7px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 17px; color: var(--text);
  transition: border-color .15s, box-shadow .15s, transform .1s;
}
.card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(9, 105, 218, .10);
  transform: translateY(-1px);
  text-decoration: none;
}
.card-title { font-weight: 640; line-height: 1.35; }
.card-text { color: var(--text-soft); font-size: 0.9rem; line-height: 1.5; }
.card-meta { color: var(--accent); font-size: 0.8rem; margin-top: auto; font-family: var(--mono); }

/* ---------- Теги ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.tag {
  display: inline-block; padding: 5px 12px; border-radius: 999px;
  background: var(--bg-soft); border: 1px solid var(--border-soft);
  font-size: 0.85rem; color: var(--text-soft);
}
.tag:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); text-decoration: none; }

/* ---------- Статья ---------- */
.article { max-width: 820px; }
.article-meta { color: var(--muted); font-size: 0.82rem; margin-bottom: 14px; font-family: var(--mono); }
.article ul, .article ol { padding-left: 22px; }
.article li { margin-bottom: 8px; }

.toc {
  background: var(--bg-soft); border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 16px 20px; margin: 22px 0 28px;
}
.toc-title {
  font-weight: 650; margin-bottom: 8px; font-size: 0.82rem;
  text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-family: var(--mono);
}
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin-bottom: 4px; }
.toc a { color: var(--text-soft); font-size: 0.92rem; }
.toc a:hover { color: var(--accent); }

.note {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 13px 18px; margin: 20px 0; color: #0a3069;
}
.note::before {
  content: "// важно";
  display: block; font-family: var(--mono); font-size: .74rem;
  color: var(--accent); opacity: .75; margin-bottom: 5px;
  text-transform: uppercase; letter-spacing: .06em;
}

pre.code, pre.formula {
  background: var(--bg-code); border: 1px solid var(--border-soft); border-radius: 8px;
  padding: 15px 18px; overflow-x: auto; font-size: 0.86rem; line-height: 1.55;
  font-family: var(--mono); margin: 18px 0; color: #24292f;
}
pre.formula {
  white-space: pre-wrap;
  background: #fff;
  border-left: 3px solid var(--warn);
  color: #24292f;
}
pre.code { position: relative; padding-top: 26px; }
pre.code[data-lang]:not([data-lang=""])::before {
  content: attr(data-lang); position: absolute; top: 0; left: 0; right: 0;
  padding: 4px 14px; font-size: 0.7rem; color: var(--muted);
  background: #eef1f4; border-bottom: 1px solid var(--border-soft);
  border-radius: 8px 8px 0 0; text-transform: uppercase; letter-spacing: .08em;
}
code { font-family: var(--mono); }

.table-wrap { overflow-x: auto; margin: 18px 0; border: 1px solid var(--border); border-radius: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border-soft); vertical-align: top; }
th { background: var(--bg-soft); font-weight: 650; white-space: nowrap; }
tbody tr:nth-child(even) { background: #fbfcfd; }
tr:last-child td { border-bottom: none; }

/* ---------- FAQ ---------- */
.faq { margin-top: 36px; }
.faq details {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 13px 18px; margin-bottom: 9px;
}
.faq details[open] { border-color: var(--accent); }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "▸ "; color: var(--accent); font-family: var(--mono); }
.faq details[open] summary::before { content: "▾ "; }
.faq details p { margin: 10px 0 0; color: var(--text-soft); }

/* ---------- Списки и шаги ---------- */
.checklist { list-style: none; padding: 0; margin: 14px 0; }
.checklist li { position: relative; padding-left: 26px; margin-bottom: 9px; }
.checklist li::before {
  content: "✓"; position: absolute; left: 0; top: 0; color: var(--ok); font-weight: 700;
}

.steps {
  list-style: none; counter-reset: s; padding: 0; margin: 18px 0;
  display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
}
.steps li {
  counter-increment: s; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 17px; position: relative;
  display: flex; flex-direction: column; gap: 6px;
}
.steps li::before {
  content: "0" counter(s); position: absolute; top: 13px; right: 15px;
  font-size: 1.2rem; font-weight: 700; color: var(--border); font-family: var(--mono);
}
.steps strong { font-size: 0.98rem; }
.steps span { color: var(--text-soft); font-size: 0.89rem; }

/* Блок «Как это работает» на главной */
.how { margin-top: 44px; padding: 26px 0 6px; border-top: 1px solid var(--border-soft); }
.how h2 { margin-top: 0; }

/* ---------- Цены ---------- */
.price-badges { display: flex; gap: 12px; flex-wrap: wrap; margin: 20px 0; }
.badge {
  background: var(--bg-soft); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 12px 20px; display: flex; flex-direction: column;
}
.badge span { color: var(--muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: .05em; }
.badge strong { font-size: 1.1rem; font-family: var(--mono); }

/* ---------- Форма заявки ---------- */
.lead-block {
  margin: 48px 0; background: var(--bg-soft); border: 1px solid var(--border-soft);
  border-radius: 14px; padding: 28px;
}
.lead-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.lead-text h2 { margin-top: 0; }
.lead-text h2::before { content: none; }
.lead-benefits { list-style: none; padding: 0; margin: 18px 0 0; }
.lead-benefits li { position: relative; padding-left: 24px; margin-bottom: 8px; color: var(--text-soft); }
.lead-benefits li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }

.lead-form { display: flex; flex-direction: column; gap: 12px; }
.lead-form label {
  display: flex; flex-direction: column; gap: 5px;
  font-size: 0.82rem; color: var(--text-soft); font-weight: 500;
}
.lead-form input, .lead-form select, .lead-form textarea {
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 13px; color: var(--text); font: inherit; font-size: 0.95rem; width: 100%;
  transition: border-color .15s, box-shadow .15s;
}
.lead-form input:focus, .lead-form select:focus, .lead-form textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.lead-form input::placeholder, .lead-form textarea::placeholder { color: #a0a8b0; }
.lead-form textarea { resize: vertical; }
.lead-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.form-note { font-size: 0.76rem; color: var(--muted); margin: 0; }
.form-status { font-size: 0.9rem; min-height: 20px; font-weight: 500; }
.form-status.success { color: var(--ok); }
.form-status.error { color: var(--err); }

/* ---------- Подвал ---------- */
.site-footer {
  margin-top: 64px; border-top: 1px solid var(--border-soft);
  background: var(--bg-soft); padding: 36px 0 20px;
}
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 28px; }
.footer-logo { font-weight: 700; margin-bottom: 8px; font-family: var(--mono); }
.footer-logo::before { content: "</>"; color: var(--accent); margin-right: 6px; font-weight: 500; }
.site-footer h4 {
  margin: 0 0 10px; font-size: 0.78rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: .07em; font-family: var(--mono); font-weight: 600;
}
.site-footer a { display: block; color: var(--text-soft); font-size: 0.9rem; margin-bottom: 6px; }
.site-footer a:hover { color: var(--accent); }
.copyright { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border-soft); }

/* ---------- Адаптив ---------- */
@media (max-width: 860px) {
  .lead-inner { grid-template-columns: 1fr; gap: 22px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 1.85rem; }
  h1 { font-size: 1.75rem; }
}

@media (max-width: 600px) {
  .header-cta { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .hero-stats { gap: 22px; }
  .lead-block { padding: 20px; }
  .wrap { padding: 0 14px; }
  .hero::before { background-size: 22px 22px; }
}

/* Уважение к системным настройкам: контрастность и уменьшение движения */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
  .card:hover { transform: none; }
}