/* ============================================================
   PolTech Platform Hub — дизайн-система (ТЗ §6)
   Government-grade professional. НЕ startup-hype.
   ============================================================ */

:root {
  /* Кольори — ТЗ §6 */
  --primary: #1e40af;      /* institutional blue */
  --primary-dark: #172f7e;
  --primary-light: #3b5bd4;
  --secondary: #0891b2;    /* cyan */
  --accent: #ca8a04;       /* gold — trust */
  --accent-light: #eab308;

  --bg: #f8fafc;
  --bg-alt: #eef2f7;
  --surface: #ffffff;
  --ink: #1e293b;
  --ink-soft: #475569;
  --ink-muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06), 0 1px 3px rgba(15, 23, 42, .05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, .08), 0 2px 4px rgba(15, 23, 42, .05);
  --shadow-lg: 0 18px 45px rgba(23, 47, 126, .16);

  --maxw: 1180px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
          'Helvetica Neue', Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0; font-weight: 700; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 14px;
}

.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 40px); }
.section-head p { color: var(--ink-soft); font-size: 18px; margin-top: 16px; }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 24px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 15px; cursor: pointer;
  border: 1px solid transparent; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow-md); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--surface); color: var(--primary); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--primary); }
.btn-ghost { background: rgba(255,255,255,.1); color: #fff; border-color: rgba(255,255,255,.28); }
.btn-ghost:hover { background: rgba(255,255,255,.18); }

/* ── Header ──────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(248, 250, 252, .85);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 800; font-size: 18px; letter-spacing: -0.02em; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: grid; place-items: center; color: #fff; font-size: 17px; font-weight: 800;
}
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--ink-muted); letter-spacing: .02em; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { font-size: 15px; color: var(--ink-soft); font-weight: 500; }
.nav-links a:hover { color: var(--primary); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; border-radius: 2px; }

/* ── Hero ────────────────────────────────────────────────── */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background:
    radial-gradient(1100px 500px at 80% -10%, rgba(8,145,178,.55), transparent 60%),
    radial-gradient(900px 600px at 0% 110%, rgba(202,138,4,.20), transparent 55%),
    linear-gradient(160deg, var(--primary-dark), var(--primary) 55%, #1b4bc4);
}
.hero-inner { padding: 92px 0 104px; max-width: 820px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 999px;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22);
  font-size: 13.5px; font-weight: 600; margin-bottom: 26px;
}
.badge .dot { width: 7px; height: 7px; border-radius: 50%; background: #4ade80; box-shadow: 0 0 0 3px rgba(74,222,128,.25); }
.hero h1 { font-size: clamp(34px, 5.4vw, 58px); font-weight: 800; letter-spacing: -0.03em; }
.hero .subtitle { font-size: clamp(17px, 2.1vw, 21px); color: rgba(255,255,255,.86); margin: 22px 0 34px; max-width: 640px; }
.cta-group { display: flex; flex-wrap: wrap; gap: 14px; }
.trust-badges { display: flex; flex-wrap: wrap; gap: 12px 26px; margin-top: 46px; padding-top: 30px; border-top: 1px solid rgba(255,255,255,.15); }
.trust-badges span { display: inline-flex; align-items: center; gap: 9px; font-size: 14.5px; color: rgba(255,255,255,.9); font-weight: 500; }
.trust-badges span::before { content: "✓"; display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: rgba(255,255,255,.16); font-size: 12px; }

/* ── Metrics strip ───────────────────────────────────────── */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.metric { text-align: center; padding: 8px; }
.metric .num { font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--primary); letter-spacing: -0.02em; }
.metric .lbl { color: var(--ink-muted); font-size: 14.5px; margin-top: 4px; }

/* ── Platforms grid ──────────────────────────────────────── */
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.platform-card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  display: flex; flex-direction: column; min-height: 186px;
}
.platform-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.platform-card .icon {
  width: 46px; height: 46px; border-radius: 11px; display: grid; place-items: center;
  font-size: 23px; background: var(--bg-alt); margin-bottom: 16px;
}
.platform-card h3 { font-size: 17.5px; }
.platform-card p { color: var(--ink-soft); font-size: 14.5px; margin: 8px 0 0; }
.platform-card .status {
  position: absolute; top: 18px; right: 18px; font-size: 11.5px; font-weight: 700;
  padding: 4px 10px; border-radius: 999px; letter-spacing: .03em; text-transform: uppercase;
}
.platform-card.live .status { background: #dcfce7; color: #15803d; }
.platform-card:not(.live) .status { background: var(--bg-alt); color: var(--ink-muted); }
.platform-card .arrow { margin-top: auto; color: var(--primary); font-weight: 600; font-size: 14px; padding-top: 14px; }

/* ── Ecosystem diagram ───────────────────────────────────── */
.eco { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: center; }
.eco-visual { position: relative; display: grid; place-items: center; min-height: 360px; }
.eco-hub {
  width: 148px; height: 148px; border-radius: 50%; z-index: 2;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff; display: grid; place-items: center; text-align: center;
  box-shadow: 0 14px 40px rgba(23,47,126,.35); font-weight: 700;
}
.eco-hub b { font-size: 19px; } .eco-hub small { font-size: 11.5px; opacity: .85; display:block; margin-top: 2px; }
.eco-node {
  position: absolute; background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; padding: 9px 16px; font-weight: 600; font-size: 14px;
  box-shadow: var(--shadow-md); z-index: 2;
}
.eco-node .ic { margin-right: 6px; }
.eco-node.n1 { top: 8%; left: 50%; transform: translateX(-50%); }
.eco-node.n2 { top: 50%; right: 0; transform: translateY(-50%); }
.eco-node.n3 { bottom: 8%; left: 50%; transform: translateX(-50%); }
.eco-node.n4 { top: 50%; left: 0; transform: translateY(-50%); }
.eco-rings { position: absolute; inset: 0; display: grid; place-items: center; z-index: 1; }
.eco-rings::before, .eco-rings::after {
  content: ""; position: absolute; border: 1.5px dashed var(--border-strong); border-radius: 50%;
}
.eco-rings::before { width: 220px; height: 220px; }
.eco-rings::after { width: 320px; height: 320px; opacity: .6; }
.eco-list { list-style: none; padding: 0; margin: 22px 0 0; }
.eco-list li { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--border); }
.eco-list li:last-child { border-bottom: 0; }
.eco-list .k { font-weight: 700; color: var(--primary); min-width: 92px; }
.insight {
  margin-top: 30px; padding: 20px 22px; border-left: 3px solid var(--accent);
  background: var(--bg-alt); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink-soft); font-size: 15.5px;
}

/* ── Audience ────────────────────────────────────────────── */
.audience-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.aud-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--shadow-sm); }
.aud-card .ic { font-size: 26px; margin-bottom: 12px; }
.aud-card h3 { font-size: 17px; }
.aud-card p { color: var(--ink-soft); font-size: 14.5px; margin: 8px 0 0; }
.aud-card ul { margin: 12px 0 0; padding-left: 18px; color: var(--ink-muted); font-size: 13.5px; }
.aud-card li { margin: 4px 0; }

/* ── Use cases ───────────────────────────────────────────── */
.usecases { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.usecase {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease;
}
.usecase:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.uc-head { margin-bottom: 12px; }
.uc-badge {
  display: inline-block; font-size: 13px; font-weight: 700; color: var(--primary);
  background: var(--bg-alt); padding: 5px 12px; border-radius: 999px;
}
.usecase h3 { font-size: 18px; }
.usecase > p { color: var(--ink-soft); font-size: 14.5px; margin: 8px 0 18px; }
.uc-flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.uc-chip {
  display: inline-flex; align-items: center; font-size: 13.5px; font-weight: 600;
  background: var(--surface); border: 1px solid var(--border-strong);
  padding: 6px 12px; border-radius: 8px; color: var(--ink);
}
.uc-arr { color: var(--secondary); font-weight: 700; }

/* ── Values ──────────────────────────────────────────────── */
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value { text-align: center; padding: 20px; }
.value .ic { font-size: 30px; margin-bottom: 10px; }
.value h3 { font-size: 17px; } .value p { color: var(--ink-soft); font-size: 14px; margin-top: 6px; }

/* ── Pricing ─────────────────────────────────────────────── */
.tiers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 48px; }
.tier {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--shadow-sm);
}
.tier.featured { border-color: var(--primary); box-shadow: var(--shadow-lg); }
.tier-tag {
  position: absolute; top: -11px; left: 22px; background: var(--primary); color: #fff;
  font-size: 11.5px; font-weight: 700; padding: 4px 11px; border-radius: 999px; letter-spacing: .02em;
}
.tier h3 { font-size: 18px; }
.tier-price { font-size: 28px; font-weight: 800; color: var(--primary); letter-spacing: -0.02em; margin: 10px 0 4px; }
.tier-price small { font-size: 14px; font-weight: 600; color: var(--ink-muted); }
.tier > p { color: var(--ink-soft); font-size: 14px; margin: 0 0 14px; min-height: 40px; }
.tier ul { list-style: none; padding: 0; margin: 0; }
.tier li { font-size: 13.5px; color: var(--ink-soft); padding: 6px 0 6px 22px; position: relative; }
.tier li::before { content: "✓"; position: absolute; left: 0; color: var(--secondary); font-weight: 700; }

.pricing-table-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); overflow: hidden; }
.pricing-table-head { display: flex; align-items: baseline; justify-content: space-between; padding: 20px 24px 14px; }
.pricing-table-head h3 { font-size: 17px; }
.pricing-table-head span { font-size: 13px; color: var(--ink-muted); }
.pricing-table-scroll { overflow-x: auto; }
.pricing-table { width: 100%; border-collapse: collapse; min-width: 520px; }
.pricing-table th, .pricing-table td { padding: 13px 24px; text-align: right; font-size: 14.5px; border-top: 1px solid var(--border); }
.pricing-table th:first-child, .pricing-table td:first-child { text-align: left; font-weight: 600; }
.pricing-table thead th { color: var(--ink-muted); font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: .03em; border-top: 0; }
.pricing-table tbody tr:hover { background: var(--bg-alt); }
.pricing-table .plat { display: inline-flex; align-items: center; gap: 9px; }
.pricing-loading { text-align: center !important; color: var(--ink-muted); padding: 24px !important; }
.pricing-note { padding: 14px 24px 20px; font-size: 13.5px; color: var(--ink-muted); margin: 0; }
.pricing-note a { color: var(--primary); font-weight: 600; }

/* ── Trust band ──────────────────────────────────────────── */
.trust-band { background: linear-gradient(160deg, var(--primary-dark), var(--primary)); color: #fff; }
.trust-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.trust-card { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14); border-radius: var(--radius); padding: 24px 20px; }
.trust-card .ic { font-size: 24px; margin-bottom: 10px; }
.trust-card h3 { font-size: 16px; }
.trust-card p { color: rgba(255,255,255,.8); font-size: 14px; margin-top: 6px; }

/* ── CTA ─────────────────────────────────────────────────── */
.cta-final { text-align: center; }
.cta-final h2 { font-size: clamp(28px, 3.6vw, 42px); }
.cta-final p { color: var(--ink-soft); font-size: 18px; max-width: 620px; margin: 16px auto 32px; }
.cta-final .cta-group { justify-content: center; }

/* ── Demo form ───────────────────────────────────────────── */
.demo-form { max-width: 680px; margin: 40px auto 0; text-align: left; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-md); padding: 30px; }
.demo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.demo-form .field { margin-bottom: 16px; }
.demo-form label { display: block; font-size: 13px; font-weight: 600; color: var(--ink-soft); margin-bottom: 6px; }
.demo-form input, .demo-form select, .demo-form textarea {
  width: 100%; padding: 11px 13px; border: 1px solid var(--border-strong);
  border-radius: 9px; font-size: 14px; font-family: inherit; color: var(--ink); background: var(--surface);
}
.demo-form textarea { resize: vertical; }
.demo-form input:focus, .demo-form select:focus, .demo-form textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(30,64,175,.12);
}
.demo-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.demo-hint { font-size: 13px; color: var(--ink-muted); }
.demo-msg { margin-top: 14px; font-size: 14px; display: none; }
.demo-msg.ok { display: block; color: #15803d; }
.demo-msg.err { display: block; color: #b91c1c; }
@media (max-width: 720px) { .demo-grid { grid-template-columns: 1fr; } }

/* ── Footer ──────────────────────────────────────────────── */
.site-footer { background: #0f172a; color: #cbd5e1; padding: 56px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.footer-grid h4 { color: #fff; font-size: 14px; margin: 0 0 14px; letter-spacing: .02em; }
.footer-grid a { display: block; color: #94a3b8; font-size: 14px; padding: 5px 0; }
.footer-grid a:hover { color: #fff; }
.footer-brand p { color: #94a3b8; font-size: 14px; max-width: 300px; margin: 14px 0 0; }
.footer-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid #1e293b; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; color: #64748b; font-size: 13px; }

/* ── Reveal animation ────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1000px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .audience-grid, .values-grid, .trust-cards, .tiers { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .eco { grid-template-columns: 1fr; gap: 40px; }
  .metrics { grid-template-columns: repeat(2, 1fr); gap: 28px 16px; }
}
@media (max-width: 720px) {
  .section { padding: 68px 0; }
  .nav-links, .nav-cta .btn-secondary { display: none; }
  .nav-toggle { display: block; }
  .nav.open + .mobile-menu { display: block; }
  .grid { grid-template-columns: 1fr; }
  .audience-grid, .values-grid, .trust-cards, .tiers, .usecases { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-inner { padding: 64px 0 74px; }
  .cta-group .btn { flex: 1 1 auto; justify-content: center; }
}

.mobile-menu { display: none; padding: 12px 24px 20px; border-bottom: 1px solid var(--border); background: var(--surface); }
.mobile-menu a { display: block; padding: 11px 0; color: var(--ink-soft); font-weight: 500; border-bottom: 1px solid var(--border); }
.mobile-menu .btn { width: 100%; justify-content: center; margin-top: 14px; }