:root {
  --pink: #ff8fb7;
  --pink-dark: #e85d92;
  --purple: #8b5cf6;
  --butter: #fff2b8;
  --cream: #fffaf3;
  --ink: #3a2432;
  --muted: #7d6675;
  --line: rgba(120, 76, 103, .18);
  --card: rgba(255, 255, 255, .82);
  --shadow: 0 22px 60px rgba(146, 74, 108, .18);
  font-family: Inter, ui-rounded, "SF Pro Rounded", "Nunito", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { min-height: 100%; background: var(--cream); }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 12%, rgba(255, 194, 217, .75), transparent 30%),
    radial-gradient(circle at 85% 10%, rgba(255, 242, 184, .85), transparent 28%),
    linear-gradient(140deg, #fff7fb 0%, #fffaf0 58%, #f7f0ff 100%);
}
body::before {
  content: "汉 语 拼 音 ✿";
  position: fixed;
  inset: auto 0 12px 0;
  text-align: center;
  letter-spacing: .7rem;
  color: rgba(232, 93, 146, .10);
  font-size: clamp(2rem, 8vw, 6rem);
  font-weight: 900;
  pointer-events: none;
}
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
.app-shell { width: min(960px, 100%); margin: 0 auto; padding: max(20px, env(safe-area-inset-top)) 16px 32px; position: relative; }
.app-shell.wide { width: min(1120px, 100%); }
.screen { display: none; }
.screen.active { display: block; animation: floatIn .35s ease both; }
.login-card {
  margin: min(12vh, 96px) auto 0;
  width: min(460px, 100%);
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 32px;
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.brand-badge {
  display: inline-flex; gap: 8px; align-items: center;
  padding: 8px 13px;
  border-radius: 999px;
  background: #fff0f7;
  color: var(--pink-dark);
  font-weight: 800;
}
h1 { margin: 12px 0 8px; line-height: 1.05; font-size: clamp(1.9rem, 7vw, 3.2rem); letter-spacing: -.045em; }
h2 { margin: 0 0 14px; font-size: 1.35rem; }
h3 { margin: 0 0 6px; font-size: 1.05rem; }
p { line-height: 1.55; }
.muted { color: var(--muted); }
.eyebrow { margin: 0; color: var(--pink-dark); font-weight: 900; letter-spacing: .12em; text-transform: uppercase; font-size: .78rem; }
.stack { display: grid; gap: 14px; margin-top: 20px; }
label { display: grid; gap: 7px; color: var(--muted); font-weight: 750; }
input, textarea, select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 13px 14px;
  background: rgba(255,255,255,.9);
  color: var(--ink);
  outline: none;
}
textarea { min-height: 110px; resize: vertical; }
input:focus, textarea:focus, select:focus { border-color: var(--pink); box-shadow: 0 0 0 4px rgba(255, 143, 183, .20); }
.primary, .ghost, .soft {
  border: 0;
  border-radius: 18px;
  padding: 12px 16px;
  font-weight: 900;
}
.primary { background: linear-gradient(135deg, var(--pink), #ffb86c); color: white; box-shadow: 0 12px 26px rgba(232, 93, 146, .25); }
.teacher-app .primary { background: linear-gradient(135deg, var(--purple), #ff8fb7); }
.ghost { background: rgba(255,255,255,.72); color: var(--pink-dark); border: 1px solid var(--line); }
.soft { background: #fff1f7; color: var(--pink-dark); }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 0 18px; }
.tabs { display: flex; gap: 8px; overflow-x: auto; padding: 8px 2px 16px; scrollbar-width: none; }
.tab {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.62);
  color: var(--muted);
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 900;
}
.tab.active { background: var(--ink); color: #fff; border-color: transparent; }
.panel { display: none; }
.panel.active { display: block; animation: floatIn .25s ease both; }
.grid { display: grid; gap: 14px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 18px;
  box-shadow: 0 12px 34px rgba(146, 74, 108, .11);
  backdrop-filter: blur(12px);
}
.stat { font-size: 2rem; font-weight: 950; letter-spacing: -.04em; margin: 4px 0; }
.chip, .tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: .82rem;
  font-weight: 850;
}
.chip { background: #fff3bf; color: #8a5b00; }
.tag { background: #f2eaff; color: #6040b3; margin: 3px 4px 3px 0; }
.lesson-card { display: grid; gap: 12px; }
.vocab-list { display: grid; gap: 8px; margin-top: 10px; }
.vocab-item { padding: 10px; border-radius: 16px; background: rgba(255, 246, 250, .85); }
.hanzi { font-size: 1.35rem; font-weight: 950; margin-right: 8px; }
.pinyin { color: var(--pink-dark); font-weight: 850; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.message { min-height: 22px; margin: 8px 0; color: var(--pink-dark); font-weight: 800; }
.message.error { color: #b42318; }
.list { display: grid; gap: 12px; }
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.table-like { display: grid; gap: 10px; }
.divider { height: 1px; background: var(--line); margin: 14px 0; }
.empty { border: 1px dashed var(--line); border-radius: 22px; padding: 18px; color: var(--muted); background: rgba(255,255,255,.5); }
@keyframes floatIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 760px) {
  .grid.two, .grid.three, .form-row { grid-template-columns: 1fr; }
  .topbar { align-items: flex-start; }
  .login-card { padding: 22px; border-radius: 26px; }
}