/* Аудио Видео Сервис — визуальный прототип (Phase 3C). Mobile-first, без внешних
   шрифтов и тяжёлых зависимостей. Широкая светлая основа, крупный тёмный
   сине-графитовый hero, тёмное mega-menu и footer, синий акцент. SEO-структуру
   шаблонов CSS не меняет. */

:root {
  --container: 1200px;
  --gutter: 16px;

  /* Surfaces */
  --bg: #ffffff;
  --bg-soft: #f3f6fc;
  --bg-muted: #e9eef7;
  --surface: #ffffff;

  /* Ink */
  --ink: #131826;
  --ink-soft: #475068;
  --ink-faint: #69748a;
  --line: #e3e8f1;
  --line-soft: #eef1f7;

  /* Brand / accent */
  --brand: #2563eb;
  --brand-strong: #1d4ed8;
  --brand-deep: #1740a6;
  --brand-tint: #eef4ff;
  --brand-tint-line: #cfe0ff;

  /* Dark blue-graphite (hero / mega-menu / footer / CTA) */
  --dark-1: #0f1626;
  --dark-2: #16223b;
  --dark-3: #21314f;
  --on-dark: #eef2fb;
  --on-dark-soft: #aab6cf;

  --radius: 16px;
  --radius-sm: 12px;
  --radius-pill: 999px;

  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .08);
  --shadow-md: 0 10px 28px -10px rgba(16, 24, 40, .20);
  --shadow-lg: 0 26px 60px -22px rgba(13, 22, 45, .45);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.62;
  color: var(--ink);
  background: var(--bg);
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }
a { color: var(--brand-strong); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.icon { width: 24px; height: 24px; display: inline-block; vertical-align: middle; flex: none; }

:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 6px; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .15s ease, color .15s ease, border-color .15s ease, transform .05s ease;
}
.btn:active { transform: translateY(1px); }
.btn--lg { padding: 15px 30px; font-size: 1.06rem; }

.btn--primary { background: var(--brand); color: #fff; box-shadow: 0 10px 22px -10px rgba(37, 99, 235, .9); }
.btn--primary:hover { background: var(--brand-strong); }

.btn--ghost { background: rgba(255, 255, 255, .06); color: #fff; border-color: rgba(255, 255, 255, .38); }
.btn--ghost:hover { background: rgba(255, 255, 255, .14); border-color: rgba(255, 255, 255, .65); }

/* ── Header ──────────────────────────────────────────────────────────────── */
.site-header { position: relative; z-index: 50; background: var(--surface); }

.topbar { background: var(--dark-1); color: var(--on-dark-soft); font-size: .82rem; }
.topbar__inner {
  display: flex; flex-wrap: wrap; gap: 4px 16px;
  align-items: center; justify-content: space-between;
  padding: 8px 0;
}
.topbar__geo { color: var(--on-dark); font-weight: 600; }
.topbar__note { display: none; }

.header-main { border-bottom: 1px solid var(--line); background: var(--surface); }
.header-main__inner {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: 12px 22px; padding: 16px 0;
}

.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand__logo { width: 38px; height: 38px; flex: none; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name { font-size: 1.32rem; font-weight: 800; letter-spacing: -.015em; color: var(--ink); }
.brand__tagline { font-size: .76rem; color: var(--ink-faint); }

.header-contact { margin-left: auto; text-align: right; line-height: 1.25; }
.header-contact__phone {
  display: block; font-size: 1.16rem; font-weight: 800;
  color: var(--ink); text-decoration: none; white-space: nowrap;
}
.header-contact__note { font-size: .76rem; color: var(--ink-faint); }

/* Main nav: full-width row on small screens; inline on desktop. */
.main-nav {
  order: 5; flex-basis: 100%;
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px;
}

/* Services mega-menu (pure CSS disclosure) */
.services-menu { position: relative; width: 100%; }
.services-menu__toggle {
  display: inline-flex; align-items: center; justify-content: space-between; gap: 12px;
  width: 100%; padding: 13px 20px;
  font: inherit; font-weight: 700; color: #fff;
  background: var(--brand); border: 1px solid var(--brand);
  border-radius: var(--radius-sm); cursor: pointer;
  box-shadow: 0 8px 18px -10px rgba(37, 99, 235, .9);
}
.services-menu__toggle:hover { background: var(--brand-strong); }
.services-menu__caret {
  width: 9px; height: 9px; margin-top: -3px;
  border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg); transition: transform .15s ease;
}

.mega-menu {
  display: none;
  margin-top: 10px;
  padding: 18px;
  background: linear-gradient(160deg, var(--dark-2), var(--dark-1));
  color: var(--on-dark);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.services-menu:focus-within > .mega-menu { display: block; }
.mega-menu__cols { display: grid; gap: 12px 26px; }
.mega-menu__title {
  margin: 4px 0 8px; padding-bottom: 8px;
  font-size: .76rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
  color: #8fb4ff; border-bottom: 1px solid rgba(255, 255, 255, .12);
}
.mega-menu__col ul { margin: 0; padding: 0; list-style: none; }
.mega-menu__col a {
  display: block; padding: 8px 10px; border-radius: 8px;
  font-size: .94rem; color: var(--on-dark-soft); text-decoration: none;
}
.mega-menu__col a:hover { background: rgba(37, 99, 235, .22); color: #fff; }
.mega-menu__all {
  display: inline-block; margin-top: 14px; padding: 11px 18px;
  font-weight: 700; color: #fff; text-decoration: none;
  background: var(--brand); border-radius: var(--radius-pill);
}
.mega-menu__all:hover { background: var(--brand-strong); }

.quick-nav { display: none; }

/* ── Breadcrumbs ─────────────────────────────────────────────────────────── */
nav.breadcrumbs { background: var(--bg-soft); border-bottom: 1px solid var(--line); padding: 10px 0; font-size: .84rem; }
nav.breadcrumbs ol { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
nav.breadcrumbs li + li::before { content: '›'; margin-right: 4px; color: var(--ink-faint); }
nav.breadcrumbs a { color: var(--ink-soft); text-decoration: none; }
nav.breadcrumbs a:hover { text-decoration: underline; }
nav.breadcrumbs li:last-child { color: var(--ink); }

/* ── Main / typography ───────────────────────────────────────────────────── */
main { padding: 26px 0 64px; }

h1 { font-size: clamp(1.75rem, 5vw, 2.7rem); line-height: 1.14; margin: 0 0 16px; letter-spacing: -.02em; }
h2 { font-size: clamp(1.3rem, 2.8vw, 1.7rem); line-height: 1.22; margin: 0 0 14px; letter-spacing: -.01em; }
h3 { font-size: 1.08rem; margin: 0 0 6px; }
p { margin: 0 0 16px; }

.lead { font-size: 1.12rem; color: var(--ink-soft); }

.section-eyebrow {
  margin: 0 0 6px; font-size: .82rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .07em; color: var(--brand);
}
.section-title { margin: 0 0 22px; }

/* Vertical rhythm between top-level blocks → more air. */
main > section,
main > .feature-strip,
main > .cta-block,
main > .info-grid,
main > .price-groups,
main > .result,
main > .warning,
main > .note,
main > .back-link { margin-top: 56px; }
main > :first-child { margin-top: 0; }
main > .feature-strip { margin-top: 22px; }

/* ── Hero (city home) ────────────────────────────────────────────────────── */
.hero {
  color: var(--on-dark);
  background:
    radial-gradient(1200px 520px at 92% -20%, rgba(37, 99, 235, .42), transparent 58%),
    linear-gradient(152deg, var(--dark-2) 0%, var(--dark-1) 56%, #0a1020 100%);
  border-radius: var(--radius);
  padding: 34px 22px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.hero__inner { display: grid; gap: 26px; }
.hero__eyebrow {
  margin: 0 0 12px; font-size: .82rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .08em; color: #8fb4ff;
}
.hero h1 { color: #fff; margin: 0 0 16px; }
.hero__lead { color: var(--on-dark-soft); font-size: 1.16rem; max-width: 56ch; }

.hero__actions { display: flex; flex-wrap: wrap; gap: 14px; margin: 26px 0 6px; }

.hero__points { list-style: none; margin: 22px 0 0; padding: 0; display: grid; gap: 12px; }
.hero__points li { display: flex; align-items: center; gap: 12px; color: var(--on-dark); font-weight: 600; font-size: .98rem; }
.hero__points .icon { color: #8fb4ff; width: 26px; height: 26px; padding: 4px; border-radius: 8px; background: rgba(37, 99, 235, .18); border: 1px solid rgba(143, 180, 255, .35); }

/* CSS-only technical motif: signal rings + mounted camera with a lens. */
.hero__visual {
  position: relative; min-height: 230px;
  border-radius: var(--radius);
  border: 1px solid rgba(143, 180, 255, .16);
  background:
    radial-gradient(circle at 1px 1px, rgba(174, 185, 208, .14) 1px, transparent 0) 0 0 / 24px 24px,
    linear-gradient(150deg, rgba(37, 99, 235, .20), rgba(10, 16, 32, .04));
  overflow: hidden;
}
.hero__rings {
  position: absolute; right: -64px; bottom: -64px;
  width: 280px; height: 280px; border-radius: 50%;
  border: 2px solid rgba(37, 99, 235, .5);
  box-shadow: 0 0 0 30px rgba(37, 99, 235, .12), 0 0 0 64px rgba(37, 99, 235, .07);
}
.hero__cam {
  position: absolute; left: 46%; top: 48%;
  width: 150px; height: 84px;
  transform: translate(-50%, -50%) rotate(-10deg);
  background: linear-gradient(160deg, #eaf0fd 0%, #bccae8 58%, #91a6d1 100%);
  border-radius: 14px 18px 18px 14px;
  box-shadow: 0 22px 44px -16px rgba(0, 0, 0, .55), inset 0 1px 0 rgba(255, 255, 255, .6);
}
.hero__cam::before {
  content: ''; position: absolute; left: -24px; top: 50%; transform: translateY(-50%);
  width: 56px; height: 56px; border-radius: 50%;
  background: radial-gradient(circle at 36% 32%, #8fbcff 0%, #1b2a52 58%, #0b1430 100%);
  border: 4px solid #e3eaf8; box-shadow: 0 0 0 3px rgba(37, 99, 235, .55);
}
.hero__cam::after {
  content: ''; position: absolute; right: 26px; bottom: -24px;
  width: 10px; height: 28px; border-radius: 6px; background: #91a6d1;
  box-shadow: 16px 2px 0 -1px #91a6d1;
}

/* ── Feature strip (under hero) ──────────────────────────────────────────── */
.feature-strip {
  position: relative; z-index: 2;
  list-style: none; margin: 22px 0 0; padding: 18px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-md);
  display: grid; gap: 12px; grid-template-columns: 1fr;
}
.feature { display: flex; align-items: center; gap: 12px; font-weight: 600; font-size: .96rem; }
.feature__icon {
  display: inline-grid; place-items: center; flex: none;
  width: 42px; height: 42px; border-radius: 12px;
  color: var(--brand); background: var(--brand-tint); border: 1px solid var(--brand-tint-line);
}

/* ── Services: large category cards (city home) ──────────────────────────── */
.cat-grid { display: grid; gap: 18px; grid-template-columns: 1fr; }
.cat-card {
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
  transition: border-color .15s ease, box-shadow .15s ease, transform .12s ease;
}
.cat-card:hover { border-color: var(--brand-tint-line); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.cat-card__media {
  position: relative; height: 124px; display: grid; place-items: center;
  background:
    radial-gradient(circle at 1px 1px, rgba(255, 255, 255, .10) 1px, transparent 0) 0 0 / 18px 18px,
    linear-gradient(140deg, var(--dark-3), var(--dark-1));
}
.cat-card__icon { width: 46px; height: 46px; color: #a9c6ff; }
.cat-card__body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }
.cat-card__title { font-size: 1.18rem; margin: 0 0 12px; }
.cat-card__links { list-style: none; margin: 0 0 14px; padding: 0; flex: 1; }
.cat-card__links li { margin-bottom: 8px; }
.cat-card__links a {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--ink-soft); text-decoration: none; font-size: .96rem;
}
.cat-card__links a::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--brand); flex: none; }
.cat-card__links a:hover { color: var(--brand-strong); }
.cat-card__more {
  margin-top: auto; align-self: flex-start;
  display: inline-flex; align-items: center; gap: 6px;
  font-weight: 700; color: var(--brand-strong); text-decoration: none;
}
.cat-card__more-arrow { width: 18px; height: 18px; }
.cat-card:hover .cat-card__more { color: var(--brand-deep); }

/* ── Advantages: text + 2×2 grid ─────────────────────────────────────────── */
.advantages { display: grid; gap: 26px; }
.advantages__text { color: var(--ink-soft); font-size: 1.04rem; max-width: 50ch; margin: 0; }
.advantages__grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; grid-template-columns: 1fr; }
.advantage {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 18px; background: var(--bg-soft);
  border: 1px solid var(--line); border-radius: var(--radius-sm); font-weight: 600;
}
.advantage__check {
  display: inline-grid; place-items: center; flex: none;
  width: 36px; height: 36px; border-radius: 10px;
  color: var(--brand); background: var(--brand-tint); border: 1px solid var(--brand-tint-line);
}
.advantage__check .icon { width: 20px; height: 20px; }
.advantage__text { color: var(--ink); }

/* ── Works (honest placeholders) ─────────────────────────────────────────── */
.works__head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 8px 16px; margin-bottom: 8px; }
.works__head .section-title { margin: 0; }
.works__all { font-weight: 700; color: var(--brand-strong); text-decoration: none; white-space: nowrap; }
.works__all:hover { color: var(--brand-deep); }
.works__intro { color: var(--ink-soft); max-width: 70ch; margin-top: 14px; }
.works__grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 10px; }
.work-card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm);
  transition: box-shadow .15s ease, transform .12s ease;
}
.work-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.work-card__media {
  position: relative; height: 132px; display: grid; place-items: center;
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, .05) 0 2px, transparent 2px 16px),
    linear-gradient(140deg, var(--dark-3), var(--dark-1));
}
.work-card__media--camera  { background: repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 16px), linear-gradient(140deg, #27406e, #0f1626); }
.work-card__media--domofon { background: repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 16px), linear-gradient(140deg, #1f3b5e, #0f1626); }
.work-card__media--barrier { background: repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 16px), linear-gradient(140deg, #2a3566, #0f1626); }
.work-card__media--antenna { background: repeating-linear-gradient(135deg, rgba(255,255,255,.05) 0 2px, transparent 2px 16px), linear-gradient(140deg, #243f63, #0f1626); }
.work-card__badge {
  display: inline-grid; place-items: center;
  width: 56px; height: 56px; border-radius: 14px;
  color: #cfe0ff; background: rgba(37, 99, 235, .25); border: 1px solid rgba(143, 180, 255, .4);
}
.work-card__badge .icon { width: 30px; height: 30px; }
.work-card__body { padding: 16px 18px 18px; }
.work-card__title { margin: 0 0 6px; font-size: 1.05rem; }
.work-card__text { margin: 0; font-size: .9rem; color: var(--ink-faint); }
.works__note {
  margin-top: 18px; font-size: .88rem; color: var(--ink-faint);
  border-left: 3px solid var(--brand-tint-line); padding-left: 14px;
}

/* ── Process ─────────────────────────────────────────────────────────────── */
.process__list { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; gap: 16px; grid-template-columns: 1fr; }
.process__step {
  counter-increment: step; position: relative; padding: 18px 18px 18px 64px;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-sm); box-shadow: var(--shadow-sm);
}
.process__step::before {
  content: counter(step); position: absolute; left: 16px; top: 16px;
  width: 34px; height: 34px; display: grid; place-items: center;
  border-radius: 50%; background: var(--brand); color: #fff; font-weight: 700;
}
.process__step-title { display: block; font-weight: 700; margin-bottom: 3px; }
.process__step-text { display: block; color: var(--ink-soft); font-size: .94rem; }

/* ── Page head (service / info pages) ────────────────────────────────────── */
.page-head {
  position: relative; overflow: hidden;
  border-radius: var(--radius);
  background:
    radial-gradient(680px 280px at 100% -40%, rgba(37, 99, 235, .14), transparent 60%),
    linear-gradient(150deg, var(--bg-soft), #ffffff 70%);
  border: 1px solid var(--line);
}
.page-head::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: linear-gradient(var(--brand), var(--brand-deep)); }
.page-head__inner { padding: 26px 24px; }
.page-head h1 { margin-bottom: 12px; }
.page-head .lead { margin-bottom: 0; }
.page-head__local { margin: 14px 0 0; color: var(--ink-faint); font-size: .94rem; }

/* ── Info blocks (service detail cards) ──────────────────────────────────── */
.info-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.info-block {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px 22px; box-shadow: var(--shadow-sm);
}
.info-block h2 { display: flex; align-items: center; gap: 12px; font-size: 1.16rem; margin-bottom: 14px; }
.info-block__icon {
  display: inline-grid; place-items: center; flex: none;
  width: 40px; height: 40px; border-radius: 11px;
  color: var(--brand); background: var(--brand-tint); border: 1px solid var(--brand-tint-line);
}
.info-block ul { margin: 0; padding-left: 22px; }
.info-block li { margin-bottom: 8px; color: var(--ink-soft); }

.result {
  display: flex; align-items: flex-start; gap: 14px;
  background: var(--brand-tint); border: 1px solid var(--brand-tint-line);
  border-radius: var(--radius); padding: 18px 20px; margin: 0;
}
.result__icon {
  display: inline-grid; place-items: center; flex: none;
  width: 38px; height: 38px; border-radius: 10px; color: #fff; background: var(--brand);
}
.result__icon .icon { width: 22px; height: 22px; }

.warning { background: #fff8ec; border: 1px solid #f4dca6; border-radius: var(--radius); padding: 18px 20px; }
.warning h3 { margin-bottom: 6px; color: #8a5a00; }
.warning p { margin: 0; color: #6f5326; }

/* ── Prices ──────────────────────────────────────────────────────────────── */
.prices-preview {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
}
.prices-preview h2 { font-size: 1.16rem; }
.prices-preview__note { margin: 14px 0 0; font-size: .92rem; color: var(--ink-faint); }

.price-groups { display: grid; grid-template-columns: 1fr; gap: 18px; }
.price-group {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-sm);
}
.price-group h2 { font-size: 1.18rem; }
.price-list { list-style: none; margin: 0; padding: 0; }
.price-list li {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px;
  padding: 13px 0; border-bottom: 1px solid var(--line-soft);
}
.price-list li:last-child { border-bottom: 0; }
.price-row__title { font-weight: 600; flex: 1 1 58%; }
.price-row__unit { color: var(--ink-faint); font-size: .85rem; }
.price-list small { flex-basis: 100%; color: var(--ink-faint); font-size: .83rem; }
.price {
  font-weight: 800; color: var(--brand-strong); white-space: nowrap;
  background: var(--brand-tint); border: 1px solid var(--brand-tint-line);
  border-radius: var(--radius-pill); padding: 3px 12px; font-size: .95rem;
}
.note { font-size: .92rem; color: var(--ink-faint); }

/* ── Contacts ────────────────────────────────────────────────────────────── */
.contacts { display: grid; grid-template-columns: 1fr; gap: 16px; }
.contacts__card {
  position: relative; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow-sm);
}
.contacts__card--primary {
  color: var(--on-dark);
  background: linear-gradient(150deg, var(--dark-2), var(--dark-1));
  border-color: rgba(255, 255, 255, .08);
}
.contacts__card--primary h2 { color: #fff; }
.contacts__icon {
  display: inline-grid; place-items: center; width: 46px; height: 46px;
  border-radius: 12px; color: var(--brand); background: var(--brand-tint);
  border: 1px solid var(--brand-tint-line); margin-bottom: 12px;
}
.contacts__card--primary .contacts__icon { color: #cfe0ff; background: rgba(37, 99, 235, .25); border-color: rgba(143, 180, 255, .4); }
.contacts__card h2 { font-size: 1.18rem; }
.contacts__phone { display: inline-block; font-size: 1.6rem; font-weight: 800; color: #fff; text-decoration: none; margin: 4px 0 10px; }
.contacts__hint { color: var(--on-dark-soft); font-size: .94rem; }
.contacts__card:not(.contacts__card--primary) .contacts__hint { color: var(--ink-faint); }
.contacts__channels { margin: 4px 0 0; padding-left: 20px; color: var(--on-dark-soft); }
.contacts__channels li { margin-bottom: 5px; }

/* ── FAQ ─────────────────────────────────────────────────────────────────── */
.faq dl { margin: 0; }
.faq-item { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq-item:first-child { border-top: 1px solid var(--line); }
.faq-item dt { font-weight: 700; margin-bottom: 6px; color: var(--ink); }
.faq-item dd { margin: 0; color: var(--ink-soft); }

/* ── Related (cards) ─────────────────────────────────────────────────────── */
.related__grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.related-card {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 16px 18px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  text-decoration: none; color: var(--ink); box-shadow: var(--shadow-sm);
  transition: border-color .15s ease, box-shadow .15s ease, transform .12s ease;
}
.related-card:hover { border-color: var(--brand-tint-line); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.related-card__label { font-weight: 600; }
.related-card__arrow { color: var(--brand); font-weight: 700; }

/* ── CTA block ───────────────────────────────────────────────────────────── */
.cta-block {
  display: grid; gap: 16px;
  background:
    radial-gradient(760px 300px at 92% -40%, rgba(37, 99, 235, .42), transparent 60%),
    linear-gradient(142deg, var(--dark-2), var(--dark-1));
  color: var(--on-dark); border-radius: var(--radius);
  padding: 30px 24px; box-shadow: var(--shadow-md); overflow: hidden;
}
.cta-block__text { font-size: 1.32rem; font-weight: 800; color: #fff; margin: 0 0 4px; }
.cta-block__note { margin: 0; color: var(--on-dark-soft); font-size: .94rem; }
.cta-block__action { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; }
.cta-block .phone { font-size: 1.55rem; font-weight: 800; color: #fff; text-decoration: none; white-space: nowrap; }

.back-link { margin-top: 36px; }
.back-link a { color: var(--ink-soft); text-decoration: none; font-weight: 600; }
.back-link a:hover { color: var(--brand-strong); }

/* ── Root index (city selector) ──────────────────────────────────────────── */
.root-hero {
  color: var(--on-dark);
  background:
    radial-gradient(1000px 460px at 92% -20%, rgba(37, 99, 235, .4), transparent 58%),
    linear-gradient(152deg, var(--dark-2), var(--dark-1));
  border-radius: var(--radius); padding: 36px 24px; box-shadow: var(--shadow-lg);
}
.root-hero h1 { color: #fff; }
.root-hero .lead { color: var(--on-dark-soft); }

.cities-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.city-link {
  display: block; padding: 15px 16px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  text-decoration: none; color: var(--ink); font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: border-color .15s ease, box-shadow .15s ease, transform .12s ease;
}
.city-link:hover { border-color: var(--brand-tint-line); box-shadow: var(--shadow-md); transform: translateY(-2px); }

/* ── Footer (dark) ───────────────────────────────────────────────────────── */
.site-footer { margin-top: 72px; background: var(--dark-1); color: var(--on-dark-soft); font-size: .92rem; }
.site-footer__top { display: grid; grid-template-columns: 1fr; gap: 28px; padding: 44px 0 34px; }
.site-footer__name { font-size: 1.2rem; font-weight: 800; color: #fff; display: block; margin-bottom: 10px; }
.site-footer__brand p { color: var(--on-dark-soft); max-width: 46ch; }
.site-footer__phone { display: inline-block; font-size: 1.25rem; font-weight: 800; color: #fff; text-decoration: none; margin: 6px 0 6px; }
.site-footer__hint { display: block; font-size: .82rem; color: var(--on-dark-soft); }
.site-footer__nav { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.site-footer__col-title { margin: 0 0 12px; font-size: .76rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: #fff; }
.site-footer__col ul { list-style: none; margin: 0; padding: 0; }
.site-footer__col li { margin-bottom: 8px; }
.site-footer__col a { color: var(--on-dark-soft); text-decoration: none; }
.site-footer__col a:hover { color: #fff; text-decoration: underline; }
.site-footer__bottom { border-top: 1px solid rgba(255, 255, 255, .1); }
.site-footer__bottom-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 20px; padding: 18px 0 26px; font-size: .8rem; color: var(--on-dark-soft); }

/* ── Mobile polish (≤ 639px) ─────────────────────────────────────────────────
   Targeted refinements for narrow phones (360–430px). The ≥ 640px tablet/desktop
   layout from Phase 3C is intentionally left untouched: every rule here is scoped
   to ≤ 639px and never matches wider viewports. */
@media (max-width: 639px) {
  /* Safety net against any accidental horizontal overflow on narrow screens. */
  body { overflow-x: hidden; }

  /* Topbar: lighter; only the geo line shows here (note is hidden < 640px). */
  .topbar { font-size: .76rem; }
  .topbar__inner { padding: 6px 0; }

  /* Header: declutter. Brand keeps just logo + name; the phone moves to its own
     row with a hairline divider; the full-width "Услуги" button stays below. */
  .header-main__inner { gap: 10px; padding: 12px 0; }
  .brand { gap: 10px; }
  .brand__logo { width: 34px; height: 34px; }
  .brand__name { font-size: 1.16rem; }
  .brand__tagline { display: none; }

  .header-contact {
    order: 4; flex-basis: 100%; margin-left: 0;
    display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 12px;
    text-align: left; margin-top: 2px; padding-top: 12px;
    border-top: 1px solid var(--line-soft);
  }
  .header-contact__phone { font-size: 1.22rem; }
  .header-contact__note { font-size: .8rem; }

  .main-nav { gap: 10px; }

  /* Mega-menu: a compact, self-contained dark panel — not a full-screen "page".
     Groups stay vertical and readable; the list scrolls inside the panel instead
     of stretching down the whole screen, and "Все услуги" stays pinned and
     visible at the bottom. Links stay in the HTML; the disclosure is still pure
     CSS; only vertical scroll inside the panel, never horizontal. */
  .services-menu:focus-within > .mega-menu { display: flex; }
  .mega-menu {
    flex-direction: column; max-height: 60vh;
    margin-top: 8px; padding: 8px; border-radius: 14px;
  }
  .mega-menu__cols {
    flex: 1 1 auto; min-height: 0; gap: 2px;
    overflow-y: auto; -webkit-overflow-scrolling: touch; padding-right: 2px;
  }
  .mega-menu__title { margin: 8px 0 4px; padding: 0 4px 6px; }
  .mega-menu__col a { padding: 9px 10px; font-size: .95rem; }
  .mega-menu__all { flex: none; display: block; text-align: center; margin: 8px 0 0; padding: 11px 16px; }

  /* Hero: cleaner — drop the decorative camera, stack full-width CTAs. */
  .hero { padding: 28px 18px; }
  .hero__inner { gap: 18px; }
  .hero__visual { display: none; }
  .hero__lead { font-size: 1.08rem; }
  .hero__actions { gap: 10px; margin: 22px 0 4px; }
  .hero__actions .btn { width: 100%; }
  .hero__points { margin-top: 18px; }
  .root-hero { padding: 28px 20px; }

  /* Service category cards: even spacing, slimmer media band. */
  .cat-grid { gap: 14px; }
  .cat-card__media { height: 104px; }
  .cat-card__body { padding: 16px 18px 18px; }

  /* "Почему выбирают" / "Наши работы" / process / FAQ — more compact. */
  .advantages { gap: 18px; }
  .advantage { padding: 16px; }
  .works__grid { gap: 14px; }
  .work-card__media { height: 112px; }
  .process__list { gap: 12px; }
  .faq-item { padding: 14px 0; }

  /* Service / info page head. */
  .page-head__inner { padding: 22px 18px; }

  /* Pre-footer CTA: phone and button never break out of the card. */
  .cta-block { padding: 26px 20px; }
  .cta-block__text { font-size: 1.18rem; }
  .cta-block__action { gap: 12px; }
  .cta-block .phone { font-size: 1.3rem; }
  .cta-block__action .btn { width: 100%; }

  /* Footer: cleaner and more readable — not a dense technical list. Brand +
     description on top, phone a touch larger, link groups in one column with more
     air between them, bolder group headings, roomier tappable links, tidy bottom
     line. Stays single-column so long labels never wrap into a cramped mess. */
  .site-footer { margin-top: 48px; font-size: .95rem; }
  .site-footer__top { gap: 24px; padding: 34px 0 26px; }
  .site-footer__brand p { font-size: .95rem; line-height: 1.6; }
  .site-footer__phone { font-size: 1.4rem; margin: 10px 0 8px; }
  .site-footer__hint { font-size: .84rem; }
  .site-footer__nav { grid-template-columns: 1fr; gap: 22px; }
  .site-footer__col-title { font-size: .82rem; letter-spacing: .06em; margin-bottom: 10px; }
  .site-footer__col li { margin-bottom: 9px; }
  .site-footer__col a { display: inline-block; padding: 2px 0; font-size: .96rem; }
  .site-footer__bottom-inner { gap: 6px 16px; padding: 18px 0 28px; font-size: .82rem; line-height: 1.5; }
}

/* ── Tablet ──────────────────────────────────────────────────────────────── */
@media (min-width: 640px) {
  :root { --gutter: 22px; }
  .feature-strip { grid-template-columns: 1fr 1fr; gap: 16px 22px; padding: 22px 24px; }
  .cat-grid { grid-template-columns: 1fr 1fr; }
  .advantages__grid { grid-template-columns: 1fr 1fr; }
  .works__grid { grid-template-columns: 1fr 1fr; }
  .process__list { grid-template-columns: 1fr 1fr; }
  .info-grid { grid-template-columns: 1fr 1fr; }
  .related__grid { grid-template-columns: 1fr 1fr; }
  .contacts { grid-template-columns: 1fr 1fr; }
  .cities-grid { grid-template-columns: repeat(3, 1fr); }
  .cta-block { grid-template-columns: 1fr auto; align-items: center; padding: 34px 36px; }
  .topbar__note { display: inline; }
  .hero { padding: 52px 44px; }
  .page-head__inner { padding: 34px 38px; }
  .root-hero { padding: 52px 44px; }
}

/* ── Desktop ─────────────────────────────────────────────────────────────── */
@media (min-width: 940px) {
  :root { --gutter: 28px; }
  .main-nav { order: 0; flex-basis: auto; margin-left: 6px; }
  .services-menu { width: auto; }
  .services-menu__toggle { width: auto; }

  .mega-menu {
    position: absolute; top: calc(100% + 14px); left: 0; z-index: 60;
    width: 720px; max-width: 80vw; margin-top: 0;
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity .16s ease, transform .16s ease, visibility .16s ease;
  }
  .services-menu:focus-within > .mega-menu { display: block; }
  .services-menu:hover > .mega-menu,
  .services-menu:focus-within > .mega-menu { opacity: 1; visibility: visible; transform: translateY(0); }
  .mega-menu__cols { grid-template-columns: repeat(4, 1fr); }
  .services-menu:hover .services-menu__caret,
  .services-menu:focus-within .services-menu__caret { transform: rotate(225deg); margin-top: 2px; }

  .hero { padding: 64px 56px; }
  .hero__inner { grid-template-columns: 1.2fr .9fr; align-items: center; gap: 44px; }
  .hero__visual { min-height: 320px; }

  .feature-strip { grid-template-columns: repeat(4, 1fr); margin-top: -34px; }
  .cat-grid { grid-template-columns: repeat(4, 1fr); }
  .advantages { grid-template-columns: 1fr 1.1fr; align-items: start; gap: 40px; }
  .works__grid { grid-template-columns: repeat(4, 1fr); }
  .cities-grid { grid-template-columns: repeat(5, 1fr); }

  .site-footer__top { grid-template-columns: 1.4fr 2fr; gap: 44px; }
  .site-footer__nav { grid-template-columns: repeat(4, 1fr); }
}

@media (min-width: 1120px) {
  .quick-nav { display: flex; flex-wrap: wrap; gap: 2px; margin: 0; padding: 0; list-style: none; }
  .quick-nav a { display: inline-block; padding: 9px 13px; border-radius: 9px; font-size: .94rem; font-weight: 600; color: var(--ink-soft); text-decoration: none; }
  .quick-nav a:hover { background: var(--brand-tint); color: var(--brand-strong); }
}

/* ── Reduced motion ──────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}