:root{
  --brand:#4e4e4e;
  --panel:#ffffff;
  --border:rgba(0,0,0,.12);
  --shadow:0 8px 22px rgba(0,0,0,.16);
  --green:#2e7d32;
  --green-2:#1f6a29;
  --muted:#6b7280;
  --danger:#b42318;
  --warning:#b54708;
  --radius:14px;
  --font: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

html, body { height: 100%; margin: 0; font-family: var(--font); background:#f5f6f7; }
#app { height:100%; display:flex; flex-direction:column; }
* { box-sizing: border-box; }

header{
  min-height:64px;
  background: var(--brand);
  color:#fff;
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  padding:0 18px;
  gap:12px;
  box-shadow: 0 4px 18px rgba(0,0,0,.25);
  z-index:5;
}
.logo{
  width:34px; height:34px; border-radius:10px;
  display:grid; place-items:center;
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.35);
  overflow:hidden;
}
.logo svg{ width:34px; height:34px; }
.title{ display:flex; flex-direction:column; line-height:1.05; min-width:0; }
.title strong{ font-size:18px; letter-spacing:.2px; }
.title span{ font-size:12px; opacity:.85; }
.spacer{ flex:1 1 auto; }

.iconBtn, .authBtn{
  height:38px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.25);
  background: rgba(255,255,255,.10);
  color:#fff;
  padding:0 14px;
  cursor:pointer;
  font-weight:800;
  flex:0 0 auto;
}
.iconBtn{
  width:38px; padding:0;
  display:grid; place-items:center;
}
.iconBtn:hover, .authBtn:hover{ background: rgba(255,255,255,.18); }

main{
  flex:1;
  display:grid;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  gap:14px;
  padding:14px;
  min-height:0;
}

.panel{
  background: var(--panel);
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding:16px;
  display:flex;
  flex-direction:column;
  gap:12px;
  min-height:0;
}
.panel h2{ margin:0; font-size:18px; letter-spacing:.2px; }
.subtext{ margin:0; font-size:13px; color: var(--muted); line-height:1.4; }

.btn{
  border:1px solid var(--border);
  background:#fff;
  border-radius:12px;
  padding:12px 12px;
  font-weight:600;
  cursor:pointer;
  text-align:center;
  user-select:none;
}
.btn.primary{
  background: linear-gradient(180deg, var(--green), var(--green-2));
  color:#fff;
  border:none;
}
.btn.primary:hover{ filter:brightness(1.03); }
.btn.secondary:hover{ background:#f3f4f6; }
.btn.danger{
  background:#fff;
  border:1px solid rgba(180,35,24,.25);
  color: var(--danger);
}
.btn.disabled{
  opacity:.45;
  cursor:not-allowed;
  pointer-events:none;
}

.helper{ font-size:12px; color: var(--muted); margin-top:6px; }
.helper.warn{ color: var(--warning); }
.divider{ height:1px; background:rgba(0,0,0,.08); margin:6px 0; }

.pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 10px;
  border-radius:999px;
  background:#f3f4f6;
  border:1px solid rgba(0,0,0,.06);
  font-size:12px;
  color:#111827;
  width:fit-content;
}

.speciesCard{
  border:1px solid rgba(0,0,0,.10);
  border-radius:14px;
  overflow:hidden;
  background:#fff;
}
.speciesImg{
  height:220px;
  background: linear-gradient(135deg, #dbeafe, #fef3c7);
  background-size: cover;
  background-position: center;
  display:flex;
  align-items:flex-end;
  padding:10px;
  color:#fff;
  font-weight:800;
  position: relative;
  text-shadow:
    -1px -1px 0 #000,
    1px -1px 0 #000,
    -1px  1px 0 #000,
    1px  1px 0 #000;
}

.speciesImg::after{
  content:"";
  position:absolute;
  inset:0;
}

.choices{ display:flex; flex-direction:column; gap:8px; margin-top:8px; }
.choice{
  border:1px solid rgba(0,0,0,.12);
  border-radius:12px;
  padding:10px 10px;
  font-weight:650;
  cursor:pointer;
  background:#fff;
  display:flex;
  align-items:center;
  gap:10px;
}
.choice:hover{ background:#f9fafb; }
.choice.selected{
  outline: 2px solid rgba(25,118,210,.28);
  border-color: rgba(25,118,210,.40);
  background:#eff6ff;
}
.choice.correct{
  background:#ecfdf3;
  border-color: rgba(46,125,50,.45);
  outline: 2px solid rgba(46,125,50,.25);
}
.choice.wrong{
  background:#fff7ed;
  border-color: rgba(181,71,8,.35);
  outline: 2px solid rgba(181,71,8,.18);
}
.choiceIcon{
  width:18px; height:18px; border-radius:6px;
  background:#e5e7eb;
  display:grid; place-items:center;
  font-size:12px;
  color:#111;
  flex:0 0 auto;
}

#viewDiv{
  background:#e9edf1;
  border-radius: var(--radius);
  border:1px solid var(--border);
  box-shadow: var(--shadow);
  overflow:hidden;
  min-height:420px;
  position:relative;
}
#loadingBanner{
  position:absolute;
  top:12px; left:12px;
  z-index:10;
  background:rgba(255,255,255,.92);
  border:1px solid rgba(0,0,0,.10);
  border-radius:12px;
  padding:10px 12px;
  font-size:13px;
  color:#111;
  box-shadow: 0 8px 16px rgba(0,0,0,.12);
  display:none;
}

#confetti-container {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 9999;
}

.confetti {
  position: absolute;
  width: 6px;
  height: 10px;
  opacity: 0.8;
  border-radius: 2px;
  animation: confetti-fall 2000ms linear forwards;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(-10px) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(360deg);
    opacity: 0;
  }
}

@media (max-width: 960px) {
  #app {
    height: auto;
    min-height: 100%;
  }

  header {
    padding: 12px 16px;
  }

  .title {
    flex: 1 1 180px;
  }

  .spacer {
    display: none;
  }

  main {
    grid-template-columns: 1fr;
  }

  .panel {
    order: 2;
  }

  #viewDiv {
    order: 1;
    min-height: 55vh;
  }
}

@media (max-width: 640px) {
  header {
    gap: 10px;
    padding: 12px;
  }

  .logo,
  .logo svg {
    width: 30px;
    height: 30px;
  }

  .title strong {
    font-size: 16px;
  }

  .title span {
    font-size: 11px;
  }

  .authBtn {
    flex: 1 1 calc(50% - 8px);
    min-width: 120px;
  }

  .iconBtn {
    margin-left: auto;
  }

  main {
    gap: 12px;
    padding: 12px;
  }

  .panel {
    padding: 14px;
  }

  .speciesImg {
    height: 180px;
  }

  #viewDiv {
    min-height: 50vh;
  }
}