:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #102030;
  --muted: #66788a;
  --primary: #1c6adb;
  --primary-dark: #104b9f;
  --line: #dde6f0;
  --soft: #edf4ff;
  --shadow: 0 26px 80px rgba(17, 42, 68, 0.09);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max-width: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(28,106,219,0.08), transparent 25%),
    linear-gradient(180deg, #fbfdff 0%, var(--bg) 100%);
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
.container { width: min(calc(100% - 32px), var(--max-width)); margin: 0 auto; }
.topbar {
  position: sticky; top: 0; z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(255,255,255,0.82); border-bottom: 1px solid rgba(221,230,240,0.8);
}
.topbar__inner {
  display:flex; align-items:center; justify-content:space-between; gap:20px; min-height:80px;
}
.brand { display:flex; align-items:center; gap:14px; font-weight:800; letter-spacing:-0.02em; }
.brand__mark { width: 54px; height: 54px; }
.brand__text small { display:block; color: var(--muted); font-size: 12px; font-weight:600; }
.nav { display:flex; flex-wrap:wrap; gap:18px; color: #36506a;}
.nav a:hover { color: var(--primary-dark); }
.cta-link {
  padding: 12px 18px; border-radius: 14px; background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color:#fff; font-weight:700; box-shadow: 0 14px 34px rgba(28,106,219,0.24);
}
.hero { padding: 60px 0 28px; }
.hero__grid {
  display:grid; grid-template-columns: minmax(0,1.05fr) minmax(320px,0.95fr); gap: 28px; align-items: stretch;
}
.hero__card, .panel {
  background: rgba(255,255,255,0.92); border: 1px solid rgba(221,230,240,0.88); border-radius: var(--radius-xl); box-shadow: var(--shadow);
}
.hero__card { padding: clamp(28px, 4vw, 54px); }
.eyebrow {
  margin:0 0 14px; color: var(--primary-dark); font-size: 13px; font-weight:800; letter-spacing: 0.08em; text-transform: uppercase;
}
.hero h1 { margin:0; font-size: clamp(36px, 5vw, 64px); line-height: 0.98; letter-spacing: -0.05em; }
.lead { margin: 22px 0 0; color: #4d6176; font-size: clamp(18px, 2vw, 21px); line-height: 1.6; max-width: 690px; }
.hero__actions { display:flex; flex-wrap:wrap; gap:12px; margin-top: 28px; }
.btn {
  min-height: 50px; padding: 0 20px; border-radius: 16px; border: 0; font-weight: 800; transition: transform .2s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { color:#fff; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); box-shadow: 0 18px 34px rgba(28,106,219,0.24); }
.btn--secondary { color: var(--primary-dark); background: var(--soft); border: 1px solid #d7e8ff; }
.hero-mock {
  padding: 22px; display:flex; flex-direction:column; gap:18px; overflow:hidden;
}
.mock-window { border-radius: 24px; background: linear-gradient(180deg,#f9fbff,#eef4fb); border: 1px solid #dce7f4; padding: 18px; min-height: 100%; }
.mock-top { display:flex; justify-content:space-between; align-items:center; gap:16px; margin-bottom: 18px; }
.mock-chip { display:inline-flex; align-items:center; gap:8px; padding: 8px 12px; border-radius: 999px; font-size: 13px; background:#fff; color:#36506a; border: 1px solid #e2eaf3; }
.mock-chip::before { content:""; width:8px; height:8px; border-radius:50%; background:#22c55e; box-shadow:0 0 0 4px rgba(34,197,94,.12); }
.mock-layout { display:grid; grid-template-columns: 88px 1fr; gap: 16px; }
.mock-menu { background:#fff; border-radius: 22px; padding: 16px 12px; display:grid; gap:12px; align-content:start; }
.mock-menu span, .metric, .task, .flow-item { background:#fff; border:1px solid #e2eaf3; }
.mock-menu span { height: 36px; border-radius: 12px; }
.mock-main { display:grid; gap:16px; }
.metrics { display:grid; grid-template-columns: repeat(3,1fr); gap:14px; }
.metric { border-radius: 20px; padding: 16px; }
.metric strong { display:block; font-size: 26px; }
.metric small { color: var(--muted); }
.table-card { border-radius: 22px; background:#fff; border:1px solid #e2eaf3; padding: 16px; }
.table-card h3 { margin:0 0 14px; font-size: 18px; }
.tasks { display:grid; gap:10px; }
.task { display:grid; grid-template-columns: 1.2fr .8fr .6fr; gap:10px; align-items:center; padding: 12px 14px; border-radius: 14px; color:#42586f; }
.tag { width: fit-content; padding: 6px 10px; border-radius: 999px; background: #ecf6ef; color:#237347; font-size: 13px; font-weight:700; }
.section { padding: 28px 0; }
.section-heading { margin-bottom: 18px; }
.section-heading h2 { margin: 8px 0 0; font-size: clamp(28px, 4vw, 46px); line-height: 1.05; letter-spacing: -0.04em; }
.section-heading p { max-width: 760px; color: var(--muted); line-height: 1.7; }
.grid-4, .grid-3, .process-grid, .contact-layout { display:grid; gap:16px; }
.grid-4 { grid-template-columns: repeat(4,1fr); }
.grid-3 { grid-template-columns: repeat(3,1fr); }
.card {
  background: rgba(255,255,255,0.92); border:1px solid rgba(221,230,240,0.88); border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: 24px;
}
.card h3 { margin: 0 0 12px; font-size: 21px; }
.card p, .card li { color: var(--muted); line-height: 1.65; }
.number { display:inline-flex; margin-bottom:18px; color:var(--primary-dark); font-size:13px; font-weight:900; letter-spacing:.1em; }
.feature-list { display:grid; gap:10px; padding: 0; margin: 18px 0 0; list-style: none; }
.feature-list li::before { content: "• "; color: var(--primary); font-weight:700; }
.highlight {
  background: linear-gradient(135deg, #1557b1, #0f2c4f); color:#fff;
}
.highlight p, .highlight li { color: rgba(255,255,255,.8); }
.process-grid { grid-template-columns: repeat(4,1fr); }
.form-card { padding: 28px; }
.contact-layout { grid-template-columns: minmax(0,1fr) minmax(320px,.9fr); align-items:start; }
.form-grid { display:grid; grid-template-columns: repeat(2,1fr); gap:16px; }
label { display:grid; gap:8px; font-size:14px; font-weight:700; color:#334d66; }
input, textarea, select {
  width:100%; padding:14px 15px; border-radius: 14px; border:1px solid #dbe5ef; background:#f9fbff; outline:none; transition:.2s ease;
}
input:focus, textarea:focus, select:focus { border-color: var(--primary); background:#fff; box-shadow: 0 0 0 4px rgba(28,106,219,.12); }
textarea { min-height: 140px; resize: vertical; }
.form-grid .full { grid-column: 1 / -1; }
.form-result { margin-top: 14px; padding: 14px 16px; border-radius: 14px; font-size: 14px; }
.is-pending { background:#eef5ff; color:#0f4d9f; }
.is-success { background:#eaf9ef; color:#15653b; }
.is-error { background:#fff1f0; color:#9e2f2b; }
.list-plain { list-style:none; padding:0; margin:0; display:grid; gap:12px; }
.list-plain li { color: var(--muted); }
.footer { padding: 32px 0 44px; color: var(--muted); }
.footer__box { display:flex; flex-wrap:wrap; justify-content:space-between; gap:16px; padding-top: 24px; border-top:1px solid var(--line); }
@media (max-width: 1080px) {
  .hero__grid, .contact-layout, .grid-4, .grid-3, .process-grid { grid-template-columns: 1fr 1fr; }
  .hero__grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .nav { display:none; }
  .topbar__inner { min-height:72px; }
  .grid-4, .grid-3, .process-grid, .contact-layout, .form-grid { grid-template-columns: 1fr; }
  .mock-layout { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr; }
  .task { grid-template-columns: 1fr; }
  .hero { padding-top: 32px; }
  .cta-link { display:none; }
}

/* Slide-scroll layer */
html {
  scroll-snap-type: y proximity;
  scroll-padding-top: 80px;
}

body {
  overflow-x: hidden;
}


main,
footer {
  position: relative;
  z-index: 2;
}

.hero,
.section {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  position: relative;
}

.footer {
  scroll-snap-align: end;
}

/* Animated background for StroySoft / ТриЭС */
.platform-animated-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  background:
    radial-gradient(circle at 20% 18%, rgba(28, 106, 219, 0.08), transparent 24%),
    radial-gradient(circle at 80% 70%, rgba(16, 75, 159, 0.08), transparent 26%);
}

.platform-bg__grid {
  position: absolute;
  inset: -40px;
  background-image:
    linear-gradient(rgba(28, 106, 219, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 106, 219, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  transform: perspective(900px) rotateX(62deg) translateY(18%);
  transform-origin: center bottom;
  animation: platformGridMove 18s linear infinite;
}

.platform-bg__orb,
.platform-bg__node,
.platform-bg__cube,
.platform-bg__line {
  position: absolute;
  display: block;
}

.platform-bg__orb {
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(28,106,219,.16), rgba(28,106,219,0));
  filter: blur(8px);
  animation: platformFloat 12s ease-in-out infinite;
}

.platform-bg__orb--one { top: 10%; right: 8%; }
.platform-bg__orb--two { width: 260px; height: 260px; left: 7%; bottom: 8%; animation-delay: -5s; }

.platform-bg__node {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #1c6adb;
  box-shadow: 0 0 0 10px rgba(28,106,219,.1), 0 0 38px rgba(28,106,219,.45);
  animation: platformPulse 2.8s ease-in-out infinite;
}

.platform-bg__node--one { top: 24%; left: 18%; }
.platform-bg__node--two { top: 58%; right: 18%; animation-delay: -.9s; }
.platform-bg__node--three { bottom: 18%; left: 48%; animation-delay: -1.7s; }

.platform-bg__cube {
  width: 78px;
  height: 78px;
  border: 1px solid rgba(28,106,219,.22);
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(255,255,255,.62), rgba(237,244,255,.28));
  box-shadow: 0 24px 60px rgba(17,42,68,.08);
  transform: rotate(18deg);
  animation: platformCube 9s ease-in-out infinite;
}

.platform-bg__cube--one { top: 30%; right: 27%; }
.platform-bg__cube--two { left: 14%; bottom: 22%; width: 56px; height: 56px; animation-delay: -4s; }

.platform-bg__line {
  width: 420px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(28,106,219,.28), transparent);
  transform-origin: left center;
  animation: platformDataLine 5s ease-in-out infinite;
}

.platform-bg__line--one { top: 34%; left: 16%; transform: rotate(24deg); }
.platform-bg__line--two { bottom: 28%; right: 12%; transform: rotate(-28deg); animation-delay: -2s; }

@keyframes platformGridMove {
  from { background-position: 0 0, 0 0; }
  to { background-position: 0 64px, 64px 0; }
}

@keyframes platformFloat {
  0%, 100% { transform: translate3d(0,0,0) scale(1); }
  50% { transform: translate3d(18px,-24px,0) scale(1.04); }
}

@keyframes platformPulse {
  0%, 100% { transform: scale(.85); opacity: .55; }
  50% { transform: scale(1.18); opacity: 1; }
}

@keyframes platformCube {
  0%, 100% { transform: translateY(0) rotate(18deg); }
  50% { transform: translateY(-24px) rotate(32deg); }
}

@keyframes platformDataLine {
  0%, 100% { opacity: .15; filter: blur(0); }
  50% { opacity: .85; filter: blur(.2px); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-snap-type: none; }
  .platform-bg__grid,
  .platform-bg__orb,
  .platform-bg__node,
  .platform-bg__cube,
  .platform-bg__line { animation: none; }
}

@media (max-width: 760px) {
  html { scroll-snap-type: none; }
  .hero,
  .section { min-height: auto; scroll-snap-align: none; }
  .platform-animated-bg { opacity: .55; }
}