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

body {
  min-height: 100vh;
  background: #050505;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(255, 0, 92, 0.18), transparent 30%),
    radial-gradient(circle at 20% 85%, rgba(255,255,255,0.06), transparent 28%),
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: auto, auto, 80px 80px, 80px 80px;
  pointer-events: none;
  z-index: -1;
}

.back-btn {
  position: fixed;
  top: 22px;
  left: 22px;
  z-index: 9999;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(20,20,20,0.88);
  color: #fff;
  font-size: 11px;
  font-weight: 900;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

.container {
  width: min(90%, 760px);
  margin: 90px auto 50px;
  position: relative;
  z-index: 3;
}

.header {
  text-align: center;
  margin-bottom: 38px;
}

.header p {
  color: #ff005c;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.header h1 {
  font-size: clamp(42px, 7vw, 72px);
  font-weight: 900;
  letter-spacing: -4px;
  text-transform: uppercase;
}

.header h1::after {
  content: "";
  display: block;
  width: 150px;
  height: 6px;
  margin: 20px auto 0;
  border-radius: 999px;
  background: #ff005c;
  box-shadow: 0 0 25px rgba(255,0,92,0.7);
}

.card {
  background: rgba(20,20,20,0.86);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 26px;
  padding: 30px;
  backdrop-filter: blur(14px);
  box-shadow: 0 22px 55px rgba(0,0,0,0.45);
  text-align: center;
}

.button-row {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

button {
  padding: 13px 22px;
  border: none;
  border-radius: 999px;
  background: #ff005c;
  color: #fff;
  font-size: 13px;
  font-weight: 900;
  cursor: pointer;
  transition: 0.25s ease;
}

button:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 25px rgba(255,0,92,0.65);
}

#demo {
  margin-top: 26px;
  color: #cfcfcf;
  font-size: 18px;
  font-weight: 800;
  min-height: 32px;
}

/* PREVIEW MODE */
.preview-mode {
  height: 100vh;
  overflow: hidden;
}

.preview-mode .container {
  width: 100%;
  height: 100vh;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.preview-mode .card,
.preview-mode .back-btn,
.preview-mode .header p {
  display: none;
}

.preview-mode .header {
  margin: 0;
}

.preview-mode .header h1 {
  font-size: 80px;
  letter-spacing: -3px;
}

@media (max-width: 650px) {
  .container {
    margin-top: 80px;
  }

  .header h1 {
    letter-spacing: -2px;
  }

  .button-row {
    flex-direction: column;
  }
}