:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-solid: #ffffff;
  --text: #111827;
  --muted: #596579;
  --line: rgba(19, 39, 74, 0.12);
  --blue: #0878ff;
  --blue-dark: #005bc8;
  --cyan: #20baf3;
  --shadow: 0 22px 60px rgba(37, 64, 110, 0.13);
  --radius: 28px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 0%, rgba(32, 186, 243, 0.16), transparent 29rem),
    radial-gradient(circle at 92% 12%, rgba(8, 120, 255, 0.13), transparent 32rem),
    var(--bg);
  font-size: 17px;
  line-height: 1.65;
}
a { color: var(--blue-dark); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--blue); }
.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(18px) saturate(150%);
}
.nav { min-height: 74px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; margin-right: auto; color: var(--text); font-weight: 750; text-decoration: none; }
.brand-mark { width: 42px; height: 42px; filter: drop-shadow(0 7px 12px rgba(8, 120, 255, 0.2)); }
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a { color: var(--muted); font-size: 0.95rem; font-weight: 620; text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--blue); }

.hero { padding: 104px 0 86px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(300px, 0.82fr); gap: 64px; align-items: center; }
.eyebrow { color: var(--blue-dark); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.13em; text-transform: uppercase; }
h1, h2, h3 { letter-spacing: -0.035em; line-height: 1.08; }
h1 { max-width: 800px; margin: 18px 0 22px; font-size: clamp(3rem, 7vw, 5.7rem); }
h2 { margin: 0 0 18px; font-size: clamp(2rem, 4vw, 3.25rem); }
h3 { margin: 0 0 10px; font-size: 1.25rem; }
.lead { max-width: 760px; margin: 0; color: var(--muted); font-size: clamp(1.15rem, 2vw, 1.4rem); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 0 21px; border-radius: 999px; font-weight: 720; text-decoration: none; }
.button.primary { color: white; background: linear-gradient(135deg, var(--blue), var(--cyan)); box-shadow: 0 12px 28px rgba(8, 120, 255, 0.24); }
.button.secondary { color: var(--text); border: 1px solid var(--line); background: var(--surface); }
.meta { margin-top: 20px; color: var(--muted); font-size: 0.92rem; }

.phone-card { position: relative; min-height: 455px; overflow: hidden; border: 1px solid rgba(255,255,255,.54); border-radius: 46px; background: linear-gradient(155deg, #121926, #203958 58%, #047cd1); box-shadow: var(--shadow); }
.phone-card::before { content: ""; position: absolute; inset: -30% 18% 54% -28%; border-radius: 50%; background: rgba(32, 186, 243, .32); filter: blur(5px); }
.demo { position: absolute; inset: 44px 30px; padding: 26px; border: 1px solid rgba(255,255,255,.16); border-radius: 34px; background: rgba(9, 15, 26, .68); color: white; backdrop-filter: blur(20px); }
.demo-top { display: flex; justify-content: space-between; color: #9ccfff; font-size: .83rem; font-weight: 700; }
.demo h3 { margin-top: 28px; font-size: 1.65rem; }
.line-choice { display: grid; grid-template-columns: 50px 1fr auto; gap: 14px; align-items: center; margin-top: 16px; padding: 17px; border: 1px solid rgba(255,255,255,.15); border-radius: 22px; background: rgba(255,255,255,.09); }
.line-choice.active { border-color: rgba(68, 205, 255, .8); background: rgba(32, 186, 243, .2); }
.line-icon { display: grid; place-items: center; width: 50px; height: 50px; border-radius: 16px; background: #f7f8fb; color: #151b25; font-size: 1.25rem; }
.line-choice small { display: block; color: #b9c7d9; }
.arrow { color: #a9cdea; font-size: 1.4rem; }

.section { padding: 86px 0; }
.section.soft { border-block: 1px solid var(--line); background: color-mix(in srgb, var(--surface-solid) 54%, transparent); }
.section-heading { max-width: 760px; margin-bottom: 38px; }
.section-heading p, .prose p { color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: 0 10px 32px rgba(37, 64, 110, 0.06); }
.card-icon { display: grid; place-items: center; width: 48px; height: 48px; margin-bottom: 22px; border-radius: 16px; background: linear-gradient(145deg, rgba(8,120,255,.14), rgba(32,186,243,.2)); color: var(--blue-dark); font-weight: 800; }
.card p { margin-bottom: 0; color: var(--muted); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: start; }
.check-list { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; padding: 0; list-style: none; }
.check-list li { padding: 14px 16px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); font-weight: 650; }
.check-list li::before { content: "✓"; margin-right: 9px; color: var(--blue); }

.page-hero { padding: 78px 0 44px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 4.8rem); }
.content { width: min(850px, calc(100% - 40px)); margin: 0 auto; padding: 58px 0 92px; }
.prose section { margin: 0 0 44px; }
.prose h2 { font-size: 1.75rem; }
.prose h3 { margin-top: 28px; }
.prose ul { padding-left: 1.3rem; }
.prose li { margin: 9px 0; }
.notice { padding: 22px 24px; border-left: 4px solid var(--blue); border-radius: 0 18px 18px 0; background: var(--surface); }
.contact-card { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.faq { border-top: 1px solid var(--line); }
.faq details { padding: 21px 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 750; }
.faq p { color: var(--muted); }

.site-footer { border-top: 1px solid var(--line); padding: 34px 0 44px; }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; gap: 18px 25px; color: var(--muted); font-size: .92rem; }
.footer-row strong { color: var(--text); margin-right: auto; }
.footer-row a { color: var(--muted); text-decoration: none; }

@media (prefers-color-scheme: dark) {
  :root { --bg: #080d16; --surface: rgba(20, 29, 43, .78); --surface-solid: #111a28; --text: #f7f9fd; --muted: #aeb8c8; --line: rgba(188, 213, 255, .14); --blue: #3b9cff; --blue-dark: #61b8ff; --shadow: 0 25px 70px rgba(0,0,0,.38); }
}
@media (max-width: 820px) {
  .nav { flex-wrap: wrap; padding: 13px 0; gap: 12px; }
  .nav-links { width: 100%; gap: 17px; overflow-x: auto; padding-bottom: 4px; }
  .hero { padding-top: 66px; }
  .hero-grid, .two-col { grid-template-columns: 1fr; }
  .phone-card { min-height: 410px; }
  .cards { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .wrap, .content { width: min(100% - 28px, 1120px); }
  .hero { padding-bottom: 64px; }
  h1 { font-size: 2.85rem; }
  .section { padding: 64px 0; }
  .check-list { grid-template-columns: 1fr; }
  .demo { inset: 28px 18px; padding: 20px; }
  .line-choice { grid-template-columns: 44px 1fr auto; padding: 14px; }
}