:root {
  --bg: #ffffff;
  --soft: #f5f7fb;
  --text: #202635;
  --muted: #667085;
  --border: #dfe4ec;
  --accent: #3867f4;
  --accent-dark: #2852d8;
  --success: #177245;
  --danger: #b42318;
  --warning: #8a5a00;
  --shadow: 0 16px 50px rgba(22, 34, 61, 0.10);
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button, input { font: inherit; }
button { cursor: pointer; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.narrow { width: min(820px, calc(100% - 32px)); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid rgba(223,228,236,.8);
  backdrop-filter: blur(12px);
}
.header-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--text); color: #fff; font-size: 18px; }
.nav { display: flex; gap: 24px; align-items: center; }
.nav a, .footer-links a { color: #4b5565; text-decoration: none; font-size: 15px; }
.nav a:hover, .footer-links a:hover { color: var(--accent); }

.hero { padding: 76px 0 58px; background: linear-gradient(180deg, #fbfcff 0%, #fff 100%); }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.eyebrow { margin: 0 0 10px; font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
h1, h2, h3 { line-height: 1.18; letter-spacing: -.025em; margin-top: 0; }
h1 { margin-bottom: 18px; font-size: clamp(34px, 5vw, 58px); max-width: 760px; }
h2 { font-size: clamp(26px, 3vw, 38px); margin-bottom: 14px; }
h3 { font-size: 20px; margin-bottom: 10px; }
.lead { margin: 0 0 24px; font-size: clamp(18px, 2.2vw, 22px); color: #5f687a; max-width: 720px; }
.benefits { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; color: #3e4655; }
.benefits li { position: relative; padding-left: 28px; }
.benefits li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--success); font-weight: 900; }

.checker-card { background: #fff; border: 1px solid var(--border); border-radius: 24px; padding: 28px; box-shadow: var(--shadow); }
.checker-card h2 { font-size: 24px; margin-bottom: 4px; }
.muted { color: var(--muted); }
label { display: block; font-weight: 700; margin: 20px 0 8px; }
.input-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
input { width: 100%; min-width: 0; border: 1px solid #cfd6e2; border-radius: 12px; padding: 13px 14px; color: var(--text); background: #fff; outline: none; }
input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(56, 103, 244, .10); }
.primary-btn, .secondary-btn, .scan-btn { border: 0; border-radius: 12px; font-weight: 750; text-decoration: none; display: inline-flex; align-items: center; justify-content: center; }
.primary-btn { padding: 13px 18px; background: var(--accent); color: #fff; }
.primary-btn:hover { background: var(--accent-dark); }
.secondary-btn { margin-top: 10px; padding: 12px 16px; border: 1px solid var(--border); background: #fff; color: var(--text); }
.secondary-btn:hover { border-color: #b7c2d3; }
.scan-btn { margin-top: 12px; padding: 11px 14px; background: #eef3ff; color: #294fc8; }
.field-hint { margin: 8px 0 0; font-size: 13px; color: var(--muted); }

.result { margin-top: 20px; border-top: 1px solid var(--border); padding-top: 18px; }
.result-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-bottom: 14px; }
.status { display: inline-flex; align-items: center; border-radius: 999px; padding: 5px 9px; font-size: 12px; font-weight: 800; white-space: nowrap; }
.status.ok { background: #eaf7f0; color: var(--success); }
.status.bad { background: #fff0ee; color: var(--danger); }
.status.warn { background: #fff6dd; color: var(--warning); }
.result-title { margin: 0; font-size: 20px; }
.result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.result-item { background: var(--soft); border-radius: 12px; padding: 12px; }
.result-item span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 2px; }
.result-item strong { font-size: 15px; overflow-wrap: anywhere; }
.result-note { margin: 14px 0 0; padding: 12px 14px; border-left: 3px solid #91a5df; background: #f6f8ff; border-radius: 8px; font-size: 14px; color: #4a5567; }

.scanner { margin-top: 16px; overflow: hidden; border-radius: 14px; border: 1px solid var(--border); background: #10151f; }
.scanner video { display: block; width: 100%; max-height: 280px; object-fit: cover; }
.scanner-actions { background: #fff; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px; font-size: 13px; }
.text-btn { background: none; border: 0; padding: 4px; color: var(--accent); font-weight: 700; }

.section { padding: 72px 0; }
.section-soft { background: var(--soft); }
.section-heading { max-width: 760px; margin-bottom: 32px; }
.section-heading > p:last-child { color: var(--muted); font-size: 17px; margin-bottom: 0; }
.cards { display: grid; gap: 18px; }
.cards.three { grid-template-columns: repeat(3, 1fr); }
.info-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; background: #fff; }
.info-card p { margin: 0; color: var(--muted); }
.icon { display: inline-grid; place-items: center; min-width: 38px; height: 38px; padding: 0 8px; border-radius: 10px; background: #edf2ff; color: var(--accent); font-weight: 850; margin-bottom: 16px; }
.content-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 42px; align-items: start; }
.content-grid p { color: #566070; }
.note-card { border: 1px solid #dce3f2; border-radius: var(--radius); background: #fff; padding: 22px; }
.note-card > strong { display: block; font-size: 18px; margin-bottom: 12px; }
.note-card p { margin: 8px 0; }

details { border-top: 1px solid var(--border); padding: 18px 0; }
details:last-of-type { border-bottom: 1px solid var(--border); }
summary { cursor: pointer; font-weight: 750; font-size: 17px; }
details p { margin: 10px 0 0; color: var(--muted); }

.page-main { padding: 58px 0 80px; }
.page-main .narrow { max-width: 820px; }
.page-main h1 { font-size: clamp(32px, 4.5vw, 48px); }
.page-main p, .page-main li { color: #556071; }
.page-main h2 { margin-top: 32px; font-size: 26px; }
.page-main ul { padding-left: 20px; }
.contact-box { margin-top: 24px; border: 1px solid var(--border); border-radius: 16px; padding: 20px; background: var(--soft); }

.site-footer { border-top: 1px solid var(--border); padding: 34px 0 22px; background: #fff; }
.footer-grid { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; }
.footer-brand { margin-bottom: 8px; }
.footer-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 22px; }
.footer-bottom { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; }

@media (max-width: 860px) {
  .nav { display: none; }
  .hero { padding-top: 48px; }
  .hero-grid, .content-grid { grid-template-columns: 1fr; gap: 30px; }
  .cards.three { grid-template-columns: 1fr; }
  .checker-card { padding: 22px; }
}

@media (max-width: 560px) {
  .container, .narrow { width: min(100% - 24px, 1120px); }
  .header-inner { min-height: 62px; }
  .hero { padding: 34px 0 38px; }
  h1 { font-size: 35px; }
  .lead { font-size: 18px; }
  .input-row { grid-template-columns: 1fr; }
  .primary-btn { width: 100%; }
  .result-grid { grid-template-columns: 1fr; }
  .section { padding: 52px 0; }
  .footer-grid { flex-direction: column; }
  .footer-links { grid-template-columns: 1fr; }
}