* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #020617;
  color: #e5e7eb;
}

a {
  color: inherit;
}

.page {
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.35), transparent 34%),
    radial-gradient(circle at top right, rgba(250, 204, 21, 0.18), transparent 28%),
    #020617;
}

.header {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 900;
}

.logo {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, #2563eb, #facc15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
  font-weight: 900;
  box-shadow: 0 12px 35px rgba(37, 99, 235, 0.35);
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav a {
  text-decoration: none;
  color: #cbd5e1;
  font-size: 14px;
}

.nav a:hover {
  color: #ffffff;
}

.hero {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 58px 20px 80px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 42px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(37, 99, 235, 0.14);
  border: 1px solid rgba(96, 165, 250, 0.28);
  color: #bfdbfe;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 18px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(38px, 6vw, 70px);
  line-height: 0.98;
  letter-spacing: -2px;
  color: #ffffff;
}

.hero h1 span {
  color: #60a5fa;
}

.subtitle {
  max-width: 580px;
  margin: 22px 0 0;
  color: #cbd5e1;
  font-size: 18px;
  line-height: 1.65;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.btn {
  min-height: 54px;
  padding: 0 22px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  font-size: 15px;
  font-weight: 900;
  transition: transform 0.15s, opacity 0.15s;
}

.btn:hover {
  transform: translateY(-1px);
  opacity: 0.94;
}

.btn-primary {
  background: #2563eb;
  color: #ffffff;
}

.btn-android {
  background: #22c55e;
  color: #052e16;
}

.btn-muted {
  background: #1f2937;
  color: #d1d5db;
  cursor: not-allowed;
}

.hero-note {
  margin-top: 16px;
  color: #94a3b8;
  font-size: 13px;
  line-height: 1.45;
}

.phone-wrap {
  display: flex;
  justify-content: center;
}

.phone {
  width: min(360px, 88vw);
  border-radius: 38px;
  padding: 14px;
  background: linear-gradient(180deg, #1f2937, #020617);
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.65);
}

.phone-screen {
  min-height: 590px;
  border-radius: 28px;
  overflow: hidden;
  background: #0f172a;
  border: 1px solid #1f2937;
}

.mock-header {
  padding: 18px;
  background: #111827;
  border-bottom: 1px solid #1f2937;
  display: flex;
  align-items: center;
  gap: 12px;
}

.mock-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
}

.mock-title {
  font-weight: 900;
  color: #ffffff;
}

.mock-status {
  margin-top: 3px;
  color: #22c55e;
  font-size: 12px;
}

.mock-chat {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bubble {
  max-width: 82%;
  padding: 11px 13px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.4;
}

.bubble.other {
  background: #1f2937;
  color: #e5e7eb;
  border-bottom-left-radius: 5px;
}

.bubble.me {
  align-self: flex-end;
  background: #2563eb;
  color: white;
  border-bottom-right-radius: 5px;
}

.mock-file {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mock-file-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.14);
  display: flex;
  align-items: center;
  justify-content: center;
}

.mock-image {
  width: 180px;
  height: 120px;
  border-radius: 14px;
  background: linear-gradient(135deg, #2563eb, #facc15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
}

.section {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 70px 20px;
}

.section-title {
  text-align: center;
  margin: 0 0 14px;
  font-size: clamp(28px, 4vw, 44px);
  color: #ffffff;
}

.section-subtitle {
  max-width: 700px;
  margin: 0 auto 34px;
  text-align: center;
  color: #94a3b8;
  font-size: 16px;
  line-height: 1.6;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card {
  background: rgba(17, 24, 39, 0.76);
  border: 1px solid #1f2937;
  border-radius: 24px;
  padding: 22px;
}

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 15px;
  background: rgba(37, 99, 235, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}

.card h3 {
  margin: 0 0 9px;
  color: #ffffff;
  font-size: 19px;
}

.card p {
  margin: 0;
  color: #9ca3af;
  line-height: 1.55;
  font-size: 14px;
}

.screens {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.screen-card {
  min-height: 360px;
  border-radius: 26px;
  border: 1px solid #1f2937;
  background: linear-gradient(180deg, #111827, #020617);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  position: relative;
}

.screen-card::before {
  content: "";
  position: absolute;
  inset: 16px 16px 86px;
  border-radius: 22px;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.8), rgba(250, 204, 21, 0.55));
  opacity: 0.75;
}

.screen-card h3,
.screen-card p {
  position: relative;
  z-index: 1;
}

.screen-card h3 {
  margin: 0 0 6px;
  color: white;
}

.screen-card p {
  margin: 0;
  color: #9ca3af;
  font-size: 14px;
  line-height: 1.45;
}

.download {
  text-align: center;
  background: rgba(17, 24, 39, 0.76);
  border: 1px solid #1f2937;
  border-radius: 30px;
  padding: 34px;
}

.warning {
  max-width: 720px;
  margin: 22px auto 0;
  padding: 14px;
  border-radius: 18px;
  background: rgba(250, 204, 21, 0.10);
  border: 1px solid rgba(250, 204, 21, 0.28);
  color: #fde68a;
  font-size: 13px;
  line-height: 1.5;
  text-align: left;
}

.footer {
  padding: 30px 20px;
  text-align: center;
  color: #64748b;
  border-top: 1px solid #111827;
}

@media (max-width: 860px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    width: 100%;
    flex-wrap: wrap;
  }

  .hero {
    grid-template-columns: 1fr;
    padding-top: 32px;
  }

  .phone-screen {
    min-height: 500px;
  }

  .features,
  .screens {
    grid-template-columns: 1fr;
  }

  .actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}