* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: clamp(14px, 2vw, 18px);
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  background-attachment: fixed;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  padding: clamp(16px, 4vw, 40px);
}

.container {
  width: 100%;
  max-width: min(520px, 92vw);
  text-align: center;
}

h1 {
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 300;
  letter-spacing: clamp(1px, 0.4vw, 3px);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: clamp(28px, 7vw, 48px);
}

.grid {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 2.8vw, 18px);
}

.btn {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: clamp(16px, 4.5vw, 22px) clamp(20px, 5vw, 28px);
  border-radius: clamp(14px, 3vw, 20px);
  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  text-transform: uppercase;
  font-size: clamp(0.85rem, 2.6vw, 1rem);
  font-weight: 500;
  letter-spacing: clamp(0.5px, 0.2vw, 2px);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--x, 50%) var(--y, 50%), rgba(255, 255, 255, 0.14) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.btn:hover::before {
  opacity: 1;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow:
    0 12px 36px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.label {
  position: relative;
  z-index: 2;
}

.ring {
  position: absolute;
  right: clamp(14px, 4vw, 22px);
  width: clamp(8px, 1.8vw, 12px);
  height: clamp(8px, 1.8vw, 12px);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent), 0 0 24px var(--accent);
  z-index: 2;
}

@media (min-width: 768px) and (min-height: 600px) {
  body {
    padding: 40px;
  }
}

@media (max-width: 360px) {
  body { padding: 14px; }
  h1 { margin-bottom: 22px; }
}