/* ===== domofon — стили сайта ===== */

:root {
  --bg: #0a0a0b;
  --bg-soft: #111113;
  --surface: #18181b;
  --surface-hover: #202024;
  --border: #2a2a2e;
  --border-soft: #232326;
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --text-faint: #6b6b70;
  --accent: #22d3ee;
  --accent-soft: rgba(34, 211, 238, 0.12);
  --accent-text: #0a0a0b;
  --radius: 14px;
  --radius-sm: 8px;
  --shadow-lg: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
  --container: 1180px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -0.02em; }

p { margin: 0; }

ul { margin: 0; padding: 0; list-style: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-text);
  padding: 12px 20px;
  z-index: 999;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.accent-text { color: var(--accent); }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-lead {
  color: var(--text-muted);
  font-size: 17px;
  max-width: 620px;
  margin-top: 14px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}
.btn-primary:hover { background: #4dd8ec; box-shadow: 0 8px 24px -8px var(--accent-soft); }

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-lg { padding: 15px 28px; font-size: 16px; }
.btn-sm { padding: 9px 16px; font-size: 14px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.site-header.scrolled {
  border-bottom-color: var(--border-soft);
  background: rgba(10, 10, 11, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--text);
  flex-shrink: 0;
}
.logo-mark { color: var(--text); flex-shrink: 0; }
.logo-dot { fill: var(--accent); }
.logo-signal { stroke: var(--accent); }
.logo-dot-accent { color: var(--accent); }

.main-nav ul {
  display: flex;
  gap: 32px;
}
.main-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}
.main-nav a:hover { color: var(--text); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.phone-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  transition: color 0.2s ease;
}
.phone-link:hover { color: var(--accent); }

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
}
.burger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  margin: 0 auto;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 20px;
  padding: 20px 24px 28px;
  border-top: 1px solid var(--border-soft);
  background: var(--bg);
}
.mobile-nav ul { display: flex; flex-direction: column; gap: 16px; }
.mobile-nav a { font-size: 16px; font-weight: 500; color: var(--text); }
.mobile-nav.open { display: flex; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 0 100px;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-grid { position: absolute; inset: 0; opacity: 0.7; }
.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 500px;
  background: radial-gradient(ellipse at center, rgba(34, 211, 238, 0.14), transparent 70%);
  filter: blur(20px);
}

.hero-inner { position: relative; z-index: 1; max-width: 780px; }

.hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.12;
  margin: 0 0 22px;
}

.hero-lead {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 36px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 64px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 40px;
  margin: 0;
  padding-top: 36px;
  border-top: 1px solid var(--border-soft);
}
.hero-stats dt {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  margin: 0 0 4px;
}
.hero-stats dd {
  margin: 0;
  font-size: 13px;
  color: var(--text-faint);
}

/* ---------- Services ---------- */
.services { padding: 100px 0; }

.services h2, .advantages h2, .about h2, .contacts h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  max-width: 640px;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 32px;
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.25s ease;
}
.service-card:hover {
  border-color: var(--accent);
  background: var(--surface-hover);
  transform: translateY(-4px);
}

.service-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 20px;
}
.service-icon svg { width: 26px; height: 26px; }

.service-card h3 { font-size: 20px; margin-bottom: 10px; }
.service-card > p { color: var(--text-muted); margin-bottom: 18px; }

.service-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.service-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.service-list li:last-child { margin-bottom: 0; }

/* ---------- Advantages ---------- */
.advantages { padding: 100px 0; background: var(--bg-soft); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 48px;
}

.advantage svg {
  width: 30px;
  height: 30px;
  color: var(--accent);
  margin-bottom: 18px;
}
.advantage h3 { font-size: 18px; margin-bottom: 8px; }
.advantage p { color: var(--text-muted); font-size: 15px; }

/* ---------- About ---------- */
.about { padding: 100px 0; }

.about-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 64px;
  align-items: center;
}

.about-text p { color: var(--text-muted); margin: 18px 0; }
.about-text h2 { margin-bottom: 6px; }

.about-points {
  display: grid;
  gap: 18px;
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border-soft);
}
.about-points > div { display: flex; flex-direction: column; gap: 4px; }
.about-points strong { font-size: 15px; }
.about-points span { color: var(--text-muted); font-size: 14px; }

.about-visual { display: flex; align-items: center; justify-content: center; }
.about-svg { width: 100%; max-width: 340px; color: var(--text); }
.ring { fill: none; stroke: var(--border); stroke-width: 1; }
.ring-2 { stroke: var(--border-soft); }
.ring-3 { stroke: var(--accent); opacity: 0.35; }

/* ---------- CTA banner ---------- */
.cta-banner {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
}
.cta-inner { text-align: center; max-width: 620px; margin: 0 auto; }
.cta-inner h2 { font-size: clamp(26px, 3vw, 34px); margin-bottom: 14px; }
.cta-inner p { color: var(--text-muted); margin-bottom: 30px; font-size: 17px; }

/* ---------- Contacts ---------- */
.contacts { padding: 100px 0; }

.contacts-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
}

.contact-list { margin-top: 32px; display: grid; gap: 22px; }
.contact-list li { display: flex; gap: 16px; align-items: flex-start; }
.contact-list svg { width: 20px; height: 20px; color: var(--accent); flex-shrink: 0; margin-top: 3px; }
.contact-list strong { display: block; font-size: 13px; color: var(--text-faint); margin-bottom: 3px; font-weight: 500; }
.contact-list a, .contact-list span { font-size: 15.5px; font-weight: 500; }
.contact-list a:hover { color: var(--accent); }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 36px;
}
.contact-form h2 { font-size: 24px; margin-bottom: 24px; }

.form-row { margin-bottom: 18px; display: flex; flex-direction: column; gap: 8px; }
.form-row label { font-size: 13.5px; font-weight: 600; color: var(--text-muted); }

.form-row input,
.form-row select,
.form-row textarea {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.form-row textarea { resize: vertical; min-height: 90px; }

.form-error {
  display: none;
  font-size: 13px;
  color: #f87171;
}
.form-row.invalid input,
.form-row.invalid textarea { border-color: #f87171; }
.form-row.invalid .form-error { display: block; }

.form-submit { width: 100%; margin-top: 8px; }

.form-success {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 14.5px;
  font-weight: 500;
  text-align: center;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding-top: 64px;
  background: var(--bg-soft);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand p { color: var(--text-muted); margin-top: 16px; font-size: 14.5px; max-width: 280px; }

.footer-nav h4, .footer-contacts h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  margin-bottom: 18px;
  font-weight: 600;
}
.footer-nav ul { display: grid; gap: 12px; }
.footer-nav a { color: var(--text-muted); font-size: 14.5px; }
.footer-nav a:hover { color: var(--accent); }

.footer-contacts { display: grid; gap: 12px; }
.footer-contacts a, .footer-contacts span { color: var(--text-muted); font-size: 14.5px; }
.footer-contacts a:hover { color: var(--accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  padding: 22px 24px;
  border-top: 1px solid var(--border-soft);
  color: var(--text-faint);
  font-size: 13.5px;
}

/* ---------- Floating call button ---------- */
.fab-call {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 90;
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.fab-call.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.in-view { opacity: 1; transform: translateY(0); }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .service-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .about-inner { grid-template-columns: 1fr; }
  .about-visual { order: -1; max-width: 260px; margin: 0 auto; }
  .contacts-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .main-nav { display: none; }
  .header-actions .phone-link { display: none; }
  .header-actions .btn-sm { display: none; }
  .burger { display: flex; }
  .hero { padding: 80px 0 64px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .advantages-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; padding-bottom: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .services, .advantages, .about, .contacts, .cta-banner { padding: 64px 0; }
}