/* ==========================================================================
   Квазар — светлый корпоративный дизайн
   Заменяет Bootstrap 3 / Worthy theme CSS. Без внешних CSS-фреймворков.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --bg-alt: #f4f7fb;
  --bg-dark: #0f2a52;
  --text: #1a2233;
  --text-muted: #5b6472;
  --text-inverse: #eaf0fb;
  --border: #e3e8f0;
  --primary: #1d56c9;
  --primary-dark: #123c96;
  --primary-light: #eaf1fd;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(20, 30, 60, 0.06), 0 1px 2px rgba(20, 30, 60, 0.04);
  --shadow-lg: 0 20px 40px -12px rgba(20, 30, 60, 0.18);
  --container: 1140px;
  --font: "IBM Plex Sans", "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

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

.section { padding: 88px 0; }
.section--alt { background: var(--bg-alt); }

h1, h2, h3, h4 {
  font-family: var(--font);
  font-weight: 700;
  color: var(--text);
  margin: 0 0 16px;
  line-height: 1.25;
}

.section-title {
  font-size: clamp(1.75rem, 3.4vw, 2.375rem);
  letter-spacing: -0.01em;
  text-align: center;
  margin-bottom: 12px;
}
.section-title span { color: var(--primary); }

.section-lead {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.125rem;
  max-width: 640px;
  margin: 0 auto 48px;
}

.text-center { text-align: center; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Skip link ---------- */

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.906rem;
  padding: 10px 18px;
  border-radius: 8px;
  transform: translateY(-140%);
  transition: transform 0.15s ease;
}
.skip-link:focus {
  transform: translateY(0);
  color: #fff;
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand img { height: 38px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-weight: 700; font-size: 1.1875rem; color: var(--text); }
.brand-slogan { font-size: 0.75rem; color: var(--text-muted); }

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav a {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.906rem;
  color: var(--text);
}
.nav a:hover { background: var(--bg-alt); color: var(--primary); }
.nav a.is-active { color: var(--primary); }
.nav a.nav-cta {
  margin-left: 8px;
  background: var(--primary);
  color: #fff;
}
.nav a.nav-cta:hover { background: var(--primary-dark); color: #fff; }
.nav a.nav-home { padding: 10px 12px; }

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 8px;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  position: relative;
  transition: 0.2s;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after { position: absolute; top: 6px; }

/* ---------- Hero ---------- */

.hero {
  padding: 130px 0 70px;
  background:
    radial-gradient(circle at 15% 20%, rgba(29, 86, 201, 0.08), transparent 45%),
    radial-gradient(circle at 85% 0%, rgba(29, 86, 201, 0.06), transparent 40%),
    var(--bg);
  text-align: center;
}
.hero h1 {
  font-size: clamp(2.125rem, 5vw, 3.375rem);
  letter-spacing: -0.015em;
  max-width: 780px;
  margin: 0 auto 20px;
}
.hero h1 span { color: var(--primary); }
.hero p {
  font-size: 1.1875rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
}

/* ---------- About ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
  margin-bottom: 56px;
}
.about-grid img {
  border-radius: var(--radius);
  margin-bottom: 20px;
}
.spec-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: grid;
  gap: 10px;
}
.spec-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
}
.spec-list i {
  color: var(--primary);
  font-size: 0.8125rem;
}

/* accordion via native <details> */
.accordion { display: grid; gap: 12px; }
.accordion details {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
}
.accordion summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after {
  content: "+";
  font-weight: 400;
  font-size: 1.375rem;
  color: var(--primary);
  transition: transform 0.2s;
}
.accordion details[open] summary::after { transform: rotate(45deg); }
.accordion .accordion-body {
  padding: 0 22px 20px;
  color: var(--text-muted);
}
.accordion .accordion-body span { color: var(--primary); font-weight: 700; }

/* ---------- Document groups (docs.html) ---------- */

.doc-groups { display: grid; gap: 24px; margin-top: 40px; }
.doc-group {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  background: var(--bg);
}
.doc-group h3 { margin: 0; font-size: 1.25rem; }
.doc-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: grid;
  gap: 10px;
}
.doc-list li { display: flex; align-items: flex-start; gap: 10px; }
.doc-list i { color: var(--primary); font-size: 1rem; margin-top: 3px; flex-shrink: 0; }
.doc-list a { font-weight: 600; }
.doc-price { color: var(--text-muted); margin: 16px 0 0; }
.doc-price strong { color: var(--text); }
.doc-note { color: var(--text-muted); margin: 8px 0 0; font-size: 0.9375rem; }

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--bg-dark);
  color: #fff;
  padding: 48px 0;
}
.cta-band h1, .cta-band h2 {
  color: #fff;
  margin: 0;
  font-size: clamp(1.375rem, 3vw, 1.875rem);
}

/* ---------- Solutions ---------- */

.filters {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.filters button {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 12px 18px;
  min-height: 44px;
  border-radius: 999px;
  cursor: pointer;
  transition: 0.15s;
}
.filters button:hover { border-color: var(--primary); color: var(--primary); }
.filters button.is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.solutions-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  color: var(--text-muted);
  margin-bottom: 40px;
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.solution-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  cursor: pointer;
  text-align: left;
  padding: 0;
  transition: 0.2s;
  display: block;
  width: 100%;
}
.solution-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.solution-card .thumb {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.solution-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.solution-card .thumb::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(15,42,82,0) 40%, rgba(15,42,82,0.55) 100%);
  opacity: 0;
  transition: 0.2s;
}
.solution-card:hover .thumb::after { opacity: 1; }
.solution-card .label {
  padding: 16px 18px;
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--text);
  border-top: 1px solid var(--border);
}
.solution-card.is-hidden { display: none; }

/* solution dialog (native <dialog>, replaces Bootstrap modal) */
dialog.solution-dialog {
  border: none;
  border-radius: var(--radius);
  padding: 0;
  width: min(760px, 92vw);
  box-shadow: var(--shadow-lg);
}
dialog.solution-dialog::backdrop {
  background: rgba(15, 26, 51, 0.55);
  backdrop-filter: blur(2px);
}
.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 26px;
  border-bottom: 1px solid var(--border);
}
.dialog-head h4 { margin: 0; font-size: 1.25rem; }
.dialog-close {
  border: none;
  background: var(--bg-alt);
  width: 44px; height: 44px;
  border-radius: 50%;
  font-size: 1.125rem;
  cursor: pointer;
  color: var(--text-muted);
}
.dialog-close:hover { background: var(--border); }
.dialog-body {
  padding: 26px;
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 24px;
}
.dialog-body img { border-radius: var(--radius); }
.dialog-body p { margin: 0 0 12px; color: var(--text-muted); }
.dialog-body p span { color: var(--primary); font-weight: 700; }
.dialog-body a { font-weight: 600; }

/* ---------- Partners ---------- */

.partners-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.partner-card {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 26px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-width: 0;
}
.partner-card img {
  width: 130px;
  height: 52px;
  object-fit: contain;
  object-position: left center;
  flex-shrink: 0;
  margin-top: 4px;
}
.partner-card > div { min-width: 0; }
.logo-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  border-radius: 8px;
  padding: 10px 14px;
  margin-top: 4px;
}
.logo-chip img { max-height: 32px; margin-top: 0; }
.partner-card h3 { font-size: 1.0625rem; margin: 0 0 6px; overflow-wrap: break-word; }
.partner-card blockquote {
  margin: 0;
  padding: 0;
  border: none;
  color: var(--text-muted);
  font-style: normal;
  overflow-wrap: break-word;
}

/* ---------- Footer ---------- */

.site-footer { background: var(--bg-alt); }
.footer-top { padding: 88px 0 56px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.footer-lead { font-size: 1.125rem; margin-bottom: 20px; }
.contact-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.contact-list li { display: flex; gap: 10px; align-items: flex-start; color: var(--text); }
.contact-list i { color: var(--primary); margin-top: 4px; width: 16px; }
.footer-map {
  height: 320px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}
.legal {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  margin-top: 40px;
  color: var(--text-muted);
  font-size: 0.844rem;
  text-align: center;
  line-height: 1.6;
}
.subfooter {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.844rem;
}

/* ---------- Scroll to top ---------- */

.scroll-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: 0.2s;
  z-index: 900;
}
.scroll-top.is-visible { opacity: 1; pointer-events: auto; }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .about-grid,
  .solutions-intro,
  .partners-grid,
  .footer-grid { grid-template-columns: 1fr; }
  .solutions-grid { grid-template-columns: repeat(2, 1fr); }
  .dialog-body { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav {
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    gap: 2px;
    display: none;
  }
  .nav.is-open { display: flex; }
  .nav a { width: 100%; }
  .nav-toggle { display: flex; }
  .hero { padding: 150px 0 80px; }
  .section { padding: 64px 0; }
  .solutions-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
  .solutions-grid { grid-template-columns: 1fr; }
}