:root{
  --maroon:#800000;
  --bg:#f6f7fb;
}

body{
  background:
    radial-gradient(1200px 650px at 15% 0%, rgba(128,0,0,.10), transparent 55%),
    radial-gradient(1000px 550px at 90% 10%, rgba(128,0,0,.08), transparent 60%),
    var(--bg);
}

.app-shell{
  max-width: 560px;
  margin: 0 auto;
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr;
  padding: 14px 14px 20px;
  gap: 12px;
}

.app-bar{
  background: rgba(255,255,255,.80);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0,0,0,.06);
  border-radius: 1.25rem;
  padding: 14px 14px 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
}

.app-badge{
  border-color: rgba(0,0,0,.08)!important;
}

.brand-dot{
  width: 10px; height: 10px; border-radius: 999px;
  background: var(--maroon);
  box-shadow: 0 0 0 4px rgba(128,0,0,.14);
  display: inline-block;
  margin-right: 10px;
  transform: translateY(-1px);
}

.hint{
  font-size: .9rem;
  color: rgba(0,0,0,.55);
}

.tabs{
  margin-top: 10px;
  background: rgba(255,255,255,.85);
  border: 1px solid rgba(0,0,0,.06);
  border-radius: 999px;
  padding: 6px;
  display:flex;
  gap: 6px;
  box-shadow: 0 10px 26px rgba(0,0,0,.06);
}
.tab-btn{
  flex: 1;
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 10px 12px;
  font-weight: 800;
  color: rgba(0,0,0,.55);
}
.tab-btn.active{
  background: #fff;
  color: rgba(0,0,0,.85);
  box-shadow: 0 10px 26px rgba(0,0,0,.12);
}

/* Pages (vertically centered) */
.page{ display:none; height: 100%; }
.page.active{
  display:flex;
  align-items:center;
  justify-content:center;
}

.card-app{
  width: 100%;
  border: 0;
  border-radius: 1.35rem;
  background: #fff;
  box-shadow: 0 18px 60px rgba(0,0,0,.10);
  overflow: hidden;
}
.card-app .card-body{ padding: 16px; }
@media (min-width: 576px){
  .card-app .card-body{ padding: 22px; }
}

.btn-maroon{
  --bs-btn-color:#fff;
  --bs-btn-bg: var(--maroon);
  --bs-btn-border-color: var(--maroon);
  --bs-btn-hover-bg: #6f0000;
  --bs-btn-hover-border-color: #6f0000;
  --bs-btn-active-bg: #640000;
  --bs-btn-active-border-color: #640000;
  --bs-btn-focus-shadow-rgb: 128,0,0;
}

/* QR frame */
.qr-frame{
  width: 380px;
  max-width: 100%;
  margin: 0 auto;
  border-radius: 1.35rem;
  border: 1px solid rgba(0,0,0,.06);
  padding: 16px 16px 12px;
  background: #fff;
  box-shadow: 0 18px 50px rgba(0,0,0,.10);
}
.qr-stage{
  display:grid;
  place-items:center;
  padding: 10px;
  border-radius: 1.05rem;
  border: 1px dashed rgba(0,0,0,.18);
  background: linear-gradient(180deg, rgba(128,0,0,.06), transparent 70%), #fff;
  overflow:hidden;
  min-height: 260px;
}
.qr-stage canvas{
  display:block;
  margin:0 auto;
  max-width:100%;
  height:auto;
  border-radius: .9rem;
}
.qr-amount{
  text-align:center;
  margin-top: 10px;
  font-weight: 900;
  font-size: 1.15rem;
  color: color-mix(in srgb, var(--maroon) 70%, #000 30%);
}

/* History */
.month-card{
  border: 1px solid rgba(0,0,0,.06);
  border-radius: 1rem;
  overflow: hidden;
  background:#fff;
  box-shadow: 0 14px 40px rgba(0,0,0,.06);
}
.month-head{
  padding: 12px 14px;
  background: linear-gradient(180deg, rgba(128,0,0,.06), transparent 70%);
  border-bottom: 1px solid rgba(0,0,0,.06);
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:10px;
}
.month-title{ font-weight: 900; }
.month-total{
  font-weight: 900;
  color: var(--maroon);
  white-space: nowrap;
}
.txn-row{
  padding: 10px 14px;
  border-bottom: 1px solid rgba(0,0,0,.06);
  display:flex;
  justify-content:space-between;
  gap: 12px;
}
.txn-row:last-child{ border-bottom: 0; }
.txn-meta{ color: rgba(0,0,0,.55); font-size: .9rem; }
.txn-amt{ font-weight: 900; white-space: nowrap; }

details summary{ cursor:pointer; user-select:none; }