:root {
  --ink: #5a3e4b;
  --pink: #ff8fb1;
  --yellow: #ffd66b;
  --mint: #8fe3c8;
  --sky: #9fd3ff;
  --card: #fffdf8;
  --shadow: 0 8px 0 rgba(90, 62, 75, 0.14);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 15%, #fff3b0 0 70px, transparent 71px),
    radial-gradient(circle at 92% 10%, #ffd6e4 0 90px, transparent 91px),
    radial-gradient(circle at 90% 88%, #d6f5ff 0 110px, transparent 111px),
    radial-gradient(circle at 5% 88%, #e5dbff 0 80px, transparent 81px),
    linear-gradient(180deg, #fff6fa, #fef9ec);
  background-attachment: fixed;
}
.wrap { max-width: 1100px; margin: 0 auto; padding: 32px 18px 60px; }
h1 {
  font-size: clamp(30px, 6vw, 46px);
  letter-spacing: 3px;
  color: #ff6f9c;
  text-shadow: 3px 3px 0 #fff, 6px 6px 0 #ffd0de;
}
.pill {
  display: inline-block;
  background: #fff;
  border: 3px dashed var(--pink);
  border-radius: 999px;
  padding: 8px 20px;
  font-size: 16px;
}
.card {
  background: var(--card);
  border: 4px solid var(--ink);
  border-radius: 26px;
  box-shadow: var(--shadow);
}
.btn {
  font: inherit;
  font-weight: bold;
  font-size: 16px;
  color: var(--ink);
  background: #fff;
  border: 3px solid var(--ink);
  border-radius: 16px;
  padding: 10px 18px;
  cursor: pointer;
  box-shadow: 0 5px 0 var(--ink);
  transition: transform 0.1s, box-shadow 0.1s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn:active { transform: translateY(5px); box-shadow: 0 0 0 var(--ink); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn.pink { background: var(--pink); }
.btn.yellow { background: var(--yellow); }
.btn.mint { background: var(--mint); }
.teacher-badge {
  position: fixed;
  right: 12px;
  bottom: 12px;
  background: #5a3e4b;
  color: #fff;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: 999px;
  z-index: 99;
}
@keyframes pop { from { opacity: 0; transform: scale(0.94); } to { opacity: 1; transform: scale(1); } }