:root {
  --ink: #102033;
  --muted: #63758a;
  --line: #d9e2ea;
  --panel: #ffffff;
  --sky: #28b8ea;
  --green: #18a66a;
  --soft: #eef7fb;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); font: 16px Inter, system-ui, -apple-system, Segoe UI, sans-serif; background: #f7fafc; }
a { color: inherit; }
.site-nav { height: 72px; padding: 0 clamp(18px, 5vw, 70px); display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.92); position: sticky; top: 0; z-index: 2; }
.site-logo { font-size: 30px; font-weight: 900; letter-spacing: 0; }
.site-logo span { color: var(--sky); }
.site-nav nav { display: flex; gap: 18px; align-items: center; }
.site-nav a { color: var(--muted); text-decoration: none; font-weight: 800; font-size: 14px; }
.hero { min-height: calc(100vh - 72px); padding: clamp(28px, 6vw, 80px); display: grid; grid-template-columns: minmax(0, 1fr) minmax(310px, 430px); gap: clamp(30px, 7vw, 95px); align-items: center; }
.eyebrow { color: var(--green); font-weight: 900; text-transform: uppercase; letter-spacing: 0; margin: 0 0 12px; }
h1 { margin: 0; font-size: clamp(44px, 7vw, 82px); line-height: .96; letter-spacing: 0; }
.hero-text { color: #42566d; font-size: clamp(17px, 2vw, 22px); line-height: 1.5; max-width: 760px; margin: 22px 0 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.primary-action, .secondary-action { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 13px 18px; border-radius: 8px; text-decoration: none; font-weight: 900; }
.primary-action { background: var(--sky); color: #041927; }
.secondary-action { background: #fff; border: 1px solid var(--line); color: #20384f; }
.phone-preview { width: min(100%, 430px); margin-inline: auto; border: 10px solid #111821; border-radius: 42px; background: linear-gradient(180deg, #fff, #f3f8fb); padding: 24px 18px 18px; box-shadow: 0 24px 80px rgba(23,45,70,.18); min-height: 620px; display: flex; flex-direction: column; gap: 18px; }
.phone-top { display: flex; align-items: center; justify-content: space-between; font-weight: 900; }
.phone-top span:last-child { color: var(--green); font-size: 13px; }
.bubble { max-width: 84%; padding: 18px; border-radius: 18px; line-height: 1.45; font-size: 18px; }
.bubble.other { background: #eaf2f7; }
.bubble.mine { margin-left: auto; margin-top: auto; background: linear-gradient(135deg, #54d7f4, #17b3df); }
.composer-preview { border: 1px solid #cad7e2; border-radius: 28px; padding: 12px 14px; display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: center; background: #fff; color: #8191a3; }
.composer-preview strong { color: #167dcc; }
.feature-band { border-top: 1px solid var(--line); background: #fff; padding: 24px clamp(18px, 5vw, 70px); display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-band article { padding: 18px 0; display: grid; gap: 8px; }
.feature-band strong { font-size: 18px; }
.feature-band span { color: var(--muted); line-height: 1.45; }
@media (max-width: 860px) {
  .site-nav { height: auto; min-height: 64px; gap: 14px; flex-wrap: wrap; padding-block: 12px; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .phone-preview { min-height: 520px; }
  .feature-band { grid-template-columns: 1fr; }
}