:root {
  --bg: #070b12;
  --card: #0e1522;
  --text: #ecf3ff;
  --muted: #9fb0c7;
  --line: #1f2f45;
  --accent: #25d366;
  --accent-hover: #1fba58;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 450px at 20% 10%, rgba(37, 211, 102, 0.22), transparent 60%),
    radial-gradient(800px 380px at 90% 15%, rgba(72, 149, 255, 0.18), transparent 62%),
    var(--bg);
}

.container {
  width: min(100%, 1100px);
  margin: 0 auto;
  padding: 0 20px;
}

main {
  flex: 1;
  display: grid;
  place-items: center;
}

.hero {
  position: relative;
  width: 100%;
  padding: 64px 20px 32px;
  display: grid;
  place-items: center;
}

.overlay-image {
  position: absolute;
  width: min(860px, 100%);
  max-height: 420px;
  object-fit: contain;
  opacity: 0.28;
  pointer-events: none;
  filter: saturate(1.05);
}

.hero-card {
  position: relative;
  z-index: 1;
  width: min(560px, 100%);
  border: 1px solid var(--line);
  background: rgba(14, 21, 34, 0.8);
  border-radius: 20px;
  padding: 32px 24px;
  text-align: center;
  backdrop-filter: blur(6px);
}

.logo {
  width: 88px;
  height: 88px;
  object-fit: contain;
  display: block;
  margin: 0 auto 14px;
}

h1 {
  margin: 0;
  font-size: clamp(32px, 5.8vw, 50px);
  line-height: 1.08;
  letter-spacing: 0.2px;
}

.btn {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 12px;
  padding: 13px 20px;
  font-size: 16px;
  font-weight: 700;
  color: #07110a;
  background: var(--accent);
  text-decoration: none;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.hero-card .btn + .btn {
  margin-top: 10px;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.btn-secondary:hover {
  background: rgba(159, 176, 199, 0.12);
}

.btn:hover {
  transform: translateY(-1px);
  background: var(--accent-hover);
}

.footer {
  border-top: 1px solid rgba(236, 243, 255, 0.11);
  padding: 18px 0 22px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  .hero {
    padding-top: 44px;
  }

  .hero-card {
    padding: 26px 18px;
    border-radius: 16px;
  }

  .logo {
    width: 74px;
    height: 74px;
  }

  .btn {
    width: 100%;
  }
}