:root {
  --primary: #5b7cfa;
  --primary-dark: #4460d8;
  --green: #34b37a;
  --orange: #f5a623;
  --red: #e5534b;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #2a2f3a;
  --muted: #64708a;
  --radius: 16px;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}
#app { min-height: 100vh; }
.app-shell { max-width: 720px; margin: 0 auto; padding-bottom: 84px; }

/* 进入过渡（view 切换时重新渲染自动播放） */
section.wrap, section.login-wrap { animation: fadein .3s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- 通用 ---------- */
.wrap { padding: 16px; }
h2 { margin: 8px 0 4px; }
.sub { color: var(--muted); margin: 4px 0 12px; }
.hint { color: var(--muted); font-size: 13px; }
.err { color: var(--red); font-size: 14px; margin: 4px 0; }
.card {
  background: var(--card); border-radius: var(--radius);
  padding: 20px; margin: 12px 0; box-shadow: 0 2px 10px rgba(40,60,120,.06);
}
.btn {
  border: none; border-radius: 14px; cursor: pointer;
  font-size: 16px; padding: 12px 20px; min-height: 48px;
  background: #e8ebf5; color: var(--text); transition: transform .08s, filter .12s;
}
.btn:active { transform: scale(.96); filter: brightness(.94); }
.btn.primary { background: var(--primary); color: #fff; }
.btn.green { background: var(--green); color: #fff; }
.btn.orange { background: var(--orange); color: #fff; }
.btn.gray { background: #98a1b8; color: #fff; }
.btn.ghost { background: transparent; color: var(--muted); min-height: 36px; padding: 6px 12px; }
.btn.big { font-size: 18px; width: 100%; margin-top: 10px; padding: 15px; }
.btn.round { border-radius: 50%; width: 56px; height: 56px; font-size: 22px; }
.btn:disabled { opacity: .6; cursor: default; }
input {
  width: 100%; font-size: 17px; padding: 13px; margin: 8px 0;
  border: 2px solid #dfe3ee; border-radius: 12px; outline: none;
}
input:focus { border-color: var(--primary); }
label { display: block; margin: 10px 0; font-size: 15px; }

/* ---------- 登录 ---------- */
.login-wrap { min-height: 100vh; min-height: 100dvh; display: flex; align-items: center; justify-content: center; padding: 16px; }
.login-card { width: 100%; max-width: 360px; text-align: center; }
.logo { font-size: 34px; font-weight: 700; }
.logo-sm { font-weight: 700; font-size: 18px; }

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; background: var(--card); position: sticky; top: 0; z-index: 10;
  box-shadow: 0 1px 6px rgba(40,60,120,.06);
}
.top-right { display: flex; align-items: center; gap: 10px; }
.uname { font-size: 15px; color: var(--muted); }
.streak { font-size: 15px; }

/* ---------- 摸底 / 学习卡片 ---------- */
.progress-line { color: var(--muted); margin-bottom: 8px; }
.phase-tag {
  display: inline-block; background: var(--primary); color: #fff;
  border-radius: 20px; padding: 5px 14px; font-size: 14px; margin-bottom: 10px;
}
.big-word { text-align: center; padding: 36px 20px; }
.word-xl { font-size: 52px; font-weight: 800; cursor: pointer; letter-spacing: .5px; }
.phonetic { color: var(--muted); font-size: 20px; margin: 10px 0; cursor: pointer; }
.def-zh { font-size: 22px; margin-top: 18px; line-height: 1.5; }
.def-en { color: var(--muted); font-size: 15px; margin-top: 10px; line-height: 1.5; }
.example { background: #f0f3fc; border-radius: 10px; padding: 10px 14px; margin-top: 14px; font-size: 15px; line-height: 1.6; }
.row3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin-top: 14px; }
.row3 .btn { font-size: 16px; padding: 14px 6px; }

/* ---------- 测试选项 ---------- */
.quiz-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
.btn.opt { text-align: center; white-space: normal; line-height: 1.4; min-height: 64px; }
.btn.opt:disabled { opacity: 1; }                    /* 答后正确/错误色保持醒目 */
.btn.opt.correct { background: var(--green); color: #fff; }
.btn.opt.wrong { background: var(--red); color: #fff; }
.feedback { text-align: center; font-size: 17px; margin-top: 14px; }
.feedback.ok { color: var(--green); }
.feedback.bad { color: var(--red); }

/* ---------- 完成 / 空状态 ---------- */
.done-card { text-align: center; padding: 48px 20px; }
.done-emoji { font-size: 72px; animation: bounce .9s ease; }
@keyframes bounce {
  0% { transform: scale(.3); opacity: 0; }
  55% { transform: scale(1.15); }
  75% { transform: scale(.95); }
  100% { transform: scale(1); opacity: 1; }
}

/* ---------- 日历 ---------- */
.cal-nav { display: flex; justify-content: space-between; align-items: center; }
.nav-btn { min-height: 44px; min-width: 48px; font-size: 20px; padding: 8px 16px; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; margin-top: 12px; }
.cal-head { text-align: center; color: var(--muted); font-size: 13px; padding: 4px 0; }
.cal-cell {
  background: var(--card); border-radius: 10px; min-height: 58px;
  padding: 4px; text-align: center; font-size: 12px; position: relative;
}
.cal-cell.empty { background: transparent; }
.cal-cell.done { background: #d8f3e6; }
.cal-cell.part { background: #fdeeca; }
.cal-cell.future { opacity: .55; }
.cal-cell.today { outline: 3px solid var(--primary); outline-offset: -3px; }
.cal-date { font-size: 13px; color: var(--muted); }
.cal-cell.today .cal-date { color: var(--primary); font-weight: 800; }
.cal-num { font-weight: 700; margin-top: 3px; }

/* ---------- 进度 ---------- */
.bar { height: 16px; background: #e8ebf5; border-radius: 8px; overflow: hidden; margin: 14px 0 8px; }
.bar.slim { height: 8px; margin: 6px 0 4px; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--green)); border-radius: 8px; transition: width .4s; }
.stat-row { display: flex; gap: 12px; margin-top: 16px; }
.stat { flex: 1; background: #f0f3fc; border-radius: 12px; padding: 14px; text-align: center; }
.stat b { font-size: 26px; display: block; }
.stat span { color: var(--muted); font-size: 13px; }

/* ---------- 底部导航 ---------- */
.tabbar {
  position: fixed; bottom: 0; left: 0; right: 0; max-width: 720px; margin: 0 auto;
  display: flex; background: var(--card); box-shadow: 0 -1px 8px rgba(40,60,120,.08);
}
.tabbar button {
  flex: 1; border: none; background: none; padding: 14px 0 18px;
  font-size: 16px; color: var(--muted); cursor: pointer;
}
.tabbar button.on { color: var(--primary); font-weight: 700; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; top: 70px; left: 50%; transform: translateX(-50%);
  z-index: 99; max-width: 86%; padding: 12px 22px; border-radius: 12px;
  font-size: 15px; color: #fff; background: #3a4256; box-shadow: 0 6px 20px rgba(20,30,60,.25);
  text-align: center;
}
.toast.ok { background: var(--green); }
.toast.bad { background: var(--red); }
.toast-enter-active, .toast-leave-active { transition: opacity .25s, transform .25s; }
.toast-enter-from, .toast-leave-to { opacity: 0; transform: translateX(-50%) translateY(-8px); }

/* ---------- 低年级模式（放大+活泼）---------- */
.mode-junior .word-xl { font-size: 64px; }
.mode-junior .def-zh { font-size: 28px; }
.mode-junior .btn.opt { min-height: 84px; font-size: 19px; }
.mode-junior .quiz-grid { gap: 16px; }
.mode-junior .btn.big { font-size: 21px; padding: 18px; }
.mode-junior .phonetic { display: none; }
.mode-junior .card { border: 3px dashed #ffd591; }