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

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

/* background texture */
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;
}

/* CONTAINER */
.container {
  max-width: 720px;
  margin: 110px auto;
  text-align: center;
  position: relative;
  z-index: 3;
}

/* TITLE */
.title {
  font-size: 72px;
  font-weight: 900;
  letter-spacing: -4px;
  text-transform: uppercase;
}

/* underline */
.title::after {
  content: "";
  display: block;
  width: 160px;
  height: 6px;
  margin: 20px auto 0;
  border-radius: 50px;
  background: #ff005c;
  box-shadow: 0 0 25px rgba(255, 0, 92, 0.7);
}

/* SUBTITLE */
.subtitle {
  margin-top: 12px;
  color: #ff005c;
  font-weight: 900;
  letter-spacing: 3px;
  font-size: 13px;
}

/* CARD */
.card {
  margin-top: 42px;
  background: rgba(20, 20, 20, 0.85);
  padding: 30px;
  border-radius: 26px;

  border: 1px solid rgba(255,255,255,0.14);
  backdrop-filter: blur(14px);

  box-shadow: 0 22px 55px rgba(0,0,0,0.45);
  transition: 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 0, 92, 0.7);
  box-shadow:
    0 22px 55px rgba(0,0,0,0.5),
    0 0 30px rgba(255, 0, 92, 0.25);
}

/* TEXT */
.card p {
  margin-bottom: 12px;
  color: #cfcfcf;
  font-size: 15px;
  line-height: 1.6;
}

/* BUTTON */
.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 13px 28px;

  background: #ff005c;
  color: white;
  text-decoration: none;
  border-radius: 999px;
  font-weight: 900;

  box-shadow: 0 0 20px rgba(255, 0, 92, 0.5);
  transition: 0.3s;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(255, 0, 92, 0.8);
}

/* BACK BUTTON */
.back-btn {
  position: fixed;
  top: 30px;
  left: 30px;
  z-index: 9999;
  pointer-events: auto;

  padding: 12px 20px;
  border-radius: 999px;

  background: rgba(20, 20, 20, 0.85);
  color: #fff;

  border: 1px solid rgba(255,255,255,0.14);
  backdrop-filter: blur(14px);

  font-weight: 900;
  cursor: pointer;
  transition: 0.3s ease;
}

/* corner accent */
body::after {
  content: "";
  position: fixed;
  right: 55px;
  bottom: 55px;
  width: 44px;
  height: 44px;
  border-right: 9px solid #fff;
  border-bottom: 9px solid #fff;
  pointer-events: none;
  z-index: 1;
}

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

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

/* hide extras */
.preview-mode .card,
.preview-mode .back-btn,
.preview-mode .subtitle,
.preview-mode .btn {
  display: none;
}

/* BIG TITLE */
.preview-mode .title {
  font-size: 80px;
  letter-spacing: -3px;
}

/* responsive */
@media (max-width: 850px) {
  body {
    overflow: auto;
  }

  .container {
    margin: 90px 20px;
  }

  .title {
    font-size: 48px;
    letter-spacing: -2px;
  }

  body::after {
    display: none;
  }
}

/* ACTIVITY LABEL (top text like others) */
.activity-label {
  margin-bottom: 12px;
  color: #ff005c;
  letter-spacing: 4px;
  text-transform: uppercase;
  font-size: 13px;
  font-weight: 900;
}