/* ============ About Button & Overlay ============ */
.about-btn {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--text-3, #aaa);
  background: none;
  color: var(--text-3, #aaa);
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  margin-left: 6px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
}
.about-btn:hover {
  border-color: var(--primary, #4f46e5);
  color: var(--primary, #4f46e5);
  background: rgba(79,70,229,0.06);
}

.about-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(4px);
  opacity: 1;
  transition: opacity 0.15s ease 0.3s;
}
.about-overlay.closing {
  opacity: 0;
}
.about-overlay[hidden] {
  display: none;
}

.about-card {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.18);
  max-width: 340px;
  width: 90vw;
  padding: 32px 28px 24px;
  text-align: center;
  position: relative;
  transform: scale(1) translateY(0);
  transition: transform 0.4s cubic-bezier(0.55,0,1,0.45), opacity 0.3s ease;
  opacity: 1;
  transform-origin: center center;
}
.about-overlay.closing .about-card {
  opacity: 0;
}

.about-close {
  position: absolute;
  top: 12px;
  right: 14px;
  width: 28px;
  height: 28px;
  border: none;
  background: none;
  font-size: 20px;
  color: var(--text-3, #aaa);
  cursor: pointer;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.about-close:hover {
  background: rgba(0,0,0,0.06);
}

.about-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 16px;
}
.about-logo .logo-mark {
  transform: scale(0.8);
}
.about-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-1, #1a1a1a);
}

.about-desc {
  font-size: 14px;
  color: var(--text-2, #555);
  line-height: 1.6;
  margin: 0 0 16px;
}

.about-features {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
  text-align: left;
}
.about-features li {
  font-size: 12px;
  color: var(--text-2, #555);
  padding-left: 16px;
  position: relative;
  line-height: 1.8;
}
.about-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  transform: translateY(-50%);
  background: var(--primary, #4f46e5);
  opacity: 0.6;
}

.about-qr-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 20px;
}
.about-qr {
  width: 200px;
  height: 200px;
  border-radius: 10px;
  object-fit: cover;
  border: 1px solid #eee;
}
.about-qr-label {
  font-size: 11px;
  color: var(--text-3, #aaa);
  margin-top: 6px;
}

.about-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid #f0f0f0;
}
.about-dont-show {
  font-size: 12px;
  color: var(--text-3, #888);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
}
.about-dont-show input {
  margin: 0;
  accent-color: var(--primary, #4f46e5);
}