:root {
  --bg: #fafafa;
  --accent: #111;
  --muted: #9b9b9b;
  --card: #fff;
  --radius: 14px;
  --maxw: 420px;
  --highlight: #f7f8fc;
  --blue: #48adff;
}

/* Reset & layout */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(circle at top left, #fdfdfd 0%, #f2f4f8 40%, #e9edf5 100%);
  color: var(--accent);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  padding: 20px 14px 70px;
  background-attachment: fixed;
}

/* Frame container */
.frame {
  width: 100%;
  max-width: var(--maxw);
  flex: 1;
}

/* Back Button */
.back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%; /* smoother round shape */
  background: transparent; /* no background box */
  border: none;
  padding: 0;
  cursor: pointer;
  transition: transform 0.2s ease;
}

/* On hover, subtle movement */
.back-btn:hover {
  transform: translateX(-2px);
}

/* On click (active), glow/shadow around the arrow itself */
.back-btn:active img {
  filter: drop-shadow(0 0 6px rgba(0, 0, 0, 0.4));
}

/* Remove any unwanted focus ring */
.back-btn:focus {
  outline: none;
}

/* Arrow image sizing */
.back-btn img {
  width: 18px;
  height: 18px;
  display: block;
}

/* Header */
header {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 6px 18px rgba(10, 10, 20, 0.033);
  padding: 18px 14px;
  text-align: center;
  margin-bottom: 14px;
}

h1 {
  font-size: 22px;
  font-weight: 900;
  font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
  letter-spacing: 1px;
}

.sub {
  margin-top: 6px;
  color: var(--muted);
  font-weight: 500;
  font-size: 14px;
}

/* Cards */
.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 12px;
  box-shadow: 0 10px 30px rgba(15,15,30,0.03);
  overflow: hidden;
}

.highlight {
  background: var(--highlight);
}

.tier-body.single {
  display: block;
  text-align: left;
}

/* Description paragraph */
.tier-desc {
  font-size: 14px;
  line-height: 1.6;
  text-align: justify;
  color: var(--accent);
  margin-bottom: 16px;
}

/* FAQ Accordion */
.faq-item {
  border-top: 1px solid rgba(0,0,0,0.05);
  padding: 10px 0;
}

.faq-question {
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: color 0.2s ease;
}
.faq-question:hover {
  color: var(--blue);
}

.arrow {
  font-size: 12px;
  transition: transform 0.3s ease;
}

.faq-answer {
  display: none;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

.faq-item.active .faq-answer {
  display: block;
  opacity: 1;
  margin-top: 8px;
}


.faq-item.active .arrow {
  transform: rotate(180deg);
}

.faq-answer ul {
  margin: 8px 0 12px 18px;
  padding-left: 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.faq-answer ul li {
  margin-bottom: 4px;
}

/* Footer */
.copyright {
  width: 100%;
  max-width: var(--maxw);
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 20px 0;
  margin-top: auto;
}
.copyright a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}
.copyright a:hover {
  color: var(--blue);
}

/* Responsive */
@media (max-width: 420px) {
  h1 {
    font-size: 20px;
  }
  .tier-desc {
    font-size: 13px;
  }
  .faq-question {
    font-size: 13px;
  }
}