:root {
  --bg: #f3f4fb;
  --card: #ffffff;
  --ink: #1e2235;
  --ink-2: #6b7192;
  --line: #e6e8f2;
  --primary: #5b5bd6;
  --primary-2: #7c5bd6;
  --ok: #16a34a;
  --ok-bg: #e8f9ef;
  --err: #dc2626;
  --err-bg: #fdeeee;
  --warn: #d97706;
  --radius: 16px;
  --shadow: 0 4px 24px rgba(40, 44, 92, .08);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--ink); min-height: 100vh;
}

/* ---------- 顶栏 ---------- */
.topbar {
  background: rgba(255,255,255,.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
}
.topbar-inner {
  max-width: 1000px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { font-size: 28px; }
.brand-title { font-weight: 700; font-size: 17px; }
.brand-sub { font-size: 12px; color: var(--ink-2); }
.tabs { display: flex; gap: 6px; }
.tab {
  border: none; background: transparent; padding: 8px 16px; border-radius: 10px;
  font-size: 15px; cursor: pointer; color: var(--ink-2); transition: .15s;
}
.tab:hover { background: #eef0fa; color: var(--ink); }
.tab.active { background: var(--primary); color: #fff; font-weight: 600; }
.badge {
  display: inline-block; min-width: 18px; padding: 1px 5px; border-radius: 9px;
  background: var(--err); color: #fff; font-size: 11px; vertical-align: 2px;
}

/* ---------- 布局 ---------- */
main { max-width: 1000px; margin: 0 auto; padding: 24px 20px 80px; }
.view { display: none; }
.view.active { display: block; animation: fadein .25s ease; }
@keyframes fadein { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; } }

.card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  border: 1px solid var(--line); padding: 20px;
}
h1 { font-size: 26px; }
h3 { font-size: 16px; margin-bottom: 14px; }

.hero { text-align: center; margin: 10px 0 22px; }
.hero h1 {
  background: linear-gradient(120deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p { color: var(--ink-2); margin-top: 8px; font-size: 14px; }

/* ---------- 设置 ---------- */
.settings-card { margin-bottom: 22px; padding: 16px 20px; }
.settings-row { display: flex; gap: 28px; flex-wrap: wrap; }
.setting label { display: block; font-size: 12px; color: var(--ink-2); margin-bottom: 6px; }
.seg { display: inline-flex; background: #eef0f8; border-radius: 10px; padding: 3px; }
.seg button {
  border: none; background: transparent; padding: 5px 14px; border-radius: 8px;
  font-size: 13px; cursor: pointer; color: var(--ink-2); transition: .15s;
}
.seg button.on { background: #fff; color: var(--primary); font-weight: 600; box-shadow: 0 1px 4px rgba(0,0,0,.1); }

/* ---------- 章节列表 ---------- */
.chapter { margin-bottom: 22px; }
.chapter-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 12px; }
.chapter-head h2 { font-size: 18px; }
.chapter-head .chapter-total { font-size: 13px; color: var(--ink-2); }
.part-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.part {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 14px 16px; cursor: pointer; transition: .15s; display: flex;
  flex-direction: column; gap: 6px; position: relative;
}
.part:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: #c9cdf0; }
.part-title { font-weight: 600; font-size: 15px; }
.part-cat { font-size: 12px; color: var(--ink-2); }
.part-meta { display: flex; justify-content: space-between; align-items: center; }
.part-count { font-size: 12px; color: var(--ink-2); }
.part-acc { font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 8px; }
.acc-good { background: var(--ok-bg); color: var(--ok); }
.acc-mid  { background: #fdf3e3; color: var(--warn); }
.acc-bad  { background: var(--err-bg); color: var(--err); }
.part.whole {
  background: linear-gradient(120deg, #f0efff, #f7f2ff);
  border: 1px dashed #b9b5ec;
}

/* ---------- 按钮 / 输入 ---------- */
.btn {
  border: none; border-radius: 12px; padding: 10px 20px; font-size: 15px;
  cursor: pointer; transition: .15s; font-family: inherit;
}
.btn.primary { background: linear-gradient(120deg, var(--primary), var(--primary-2)); color: #fff; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; border: 1px solid var(--line); color: var(--ink-2); }
.btn.ghost:hover { border-color: #c5c9e8; color: var(--ink); background: #fafbff; }
.btn.danger { color: var(--err); }
.btn.small { padding: 5px 12px; font-size: 13px; border-radius: 9px; }
.answer-input {
  flex: 1; border: 2px solid var(--line); border-radius: 12px; padding: 12px 16px;
  font-size: 18px; font-family: inherit; outline: none; transition: .15s; min-width: 0;
  background: #fff;
}
.answer-input:focus { border-color: var(--primary); }

/* ---------- 练习页 ---------- */
.practice-wrap { max-width: 660px; margin: 0 auto; }
.practice-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.practice-info { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.practice-title { font-weight: 600; font-size: 15px; }
.practice-count { font-size: 12px; color: var(--ink-2); }
.live-acc {
  min-width: 58px; text-align: center; font-weight: 700; font-size: 15px;
  padding: 6px 10px; border-radius: 10px; background: #eef0f8;
}
.progress-track { height: 8px; background: #e8eaf5; border-radius: 4px; overflow: hidden; margin-bottom: 20px; }
.progress-bar { height: 100%; width: 0%; border-radius: 4px; background: linear-gradient(90deg, var(--primary), var(--primary-2)); transition: width .3s; }

.practice-card { text-align: center; padding: 36px 28px 28px; }
.play-btn {
  width: 88px; height: 88px; border-radius: 50%; border: none; cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(91,91,214,.35); transition: .15s;
}
.play-btn:hover { transform: scale(1.05); }
.play-btn:active { transform: scale(.97); }
.play-btn.speaking { animation: pulse 1s ease infinite; }
@keyframes pulse { 0%{box-shadow:0 8px 24px rgba(91,91,214,.35)} 50%{box-shadow:0 8px 36px rgba(91,91,214,.6)} }

.play-hint { color: var(--ink-2); font-size: 13px; margin: 14px 0 22px; }
.answer-area { display: flex; gap: 10px; margin-bottom: 18px; }
.answer-area .btn { flex-shrink: 0; }

.result-panel { border-radius: 14px; padding: 18px; margin-bottom: 18px; animation: fadein .2s; }
.result-panel.ok { background: var(--ok-bg); border: 1px solid #bfe8cd; }
.result-panel.err { background: var(--err-bg); border: 1px solid #f5c6c6; }
.result-head { font-size: 14px; font-weight: 700; margin-bottom: 8px; }
.ok .result-head { color: var(--ok); }
.err .result-head { color: var(--err); }
.result-word { font-size: 30px; font-weight: 700; letter-spacing: .5px; margin-bottom: 4px; word-break: break-all; }
.result-phon { color: var(--ink-2); font-size: 15px; margin-bottom: 6px; }
.result-meaning { font-size: 14px; color: var(--ink); }
.err .result-user { color: var(--err); }

.practice-actions { display: flex; justify-content: space-between; align-items: center; }
.kbd-hint { font-size: 12px; color: var(--ink-2); }

/* ---------- 总结页 ---------- */
.summary-wrap { max-width: 560px; margin: 30px auto 0; }
.summary-card { text-align: center; padding: 36px 28px; }
.score-ring {
  width: 150px; height: 150px; border-radius: 50%; margin: 22px auto;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background: conic-gradient(var(--primary) 0deg, #e8eaf5 0deg);
  position: relative;
}
.score-ring::before {
  content: ""; position: absolute; inset: 12px; border-radius: 50%; background: var(--card);
}
.score-num { position: relative; font-size: 34px; font-weight: 800; color: var(--primary); }
.score-label { position: relative; font-size: 13px; color: var(--ink-2); }
.summary-stats { display: flex; justify-content: center; gap: 34px; margin-bottom: 20px; }
.summary-stats .s { text-align: center; }
.summary-stats .s b { display: block; font-size: 22px; }
.summary-stats .s span { font-size: 12px; color: var(--ink-2); }
.wrong-list { text-align: left; margin-bottom: 22px; }
.wrong-list h4 { font-size: 14px; color: var(--err); margin-bottom: 8px; }
.wrong-list .wl-item {
  display: flex; justify-content: space-between; gap: 10px; padding: 8px 12px;
  background: var(--err-bg); border-radius: 10px; margin-bottom: 6px; font-size: 14px;
}
.wl-word { font-weight: 700; }
.wl-meaning { color: var(--ink-2); font-size: 13px; text-align: right; }
.summary-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ---------- 错词本 ---------- */
.wrong-wrap { display: flex; flex-direction: column; gap: 16px; }
.wrong-toolbar { display: flex; gap: 10px; flex-wrap: wrap; }
.wrong-toolbar .search { flex: 1; min-width: 200px; font-size: 15px; }
.wrong-toolbar-btns { display: flex; gap: 10px; }
.wrong-summary { padding: 16px 20px; display: flex; gap: 30px; flex-wrap: wrap; font-size: 14px; color: var(--ink-2); }
.wrong-summary b { color: var(--ink); font-size: 18px; margin-right: 4px; }
.wrong-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.wrong-table th {
  text-align: left; padding: 8px 10px; color: var(--ink-2); font-size: 12px;
  border-bottom: 1px solid var(--line); font-weight: 600;
}
.wrong-table td { padding: 9px 10px; border-bottom: 1px solid #f0f1f8; vertical-align: top; }
.wrong-table tr:last-child td { border-bottom: none; }
.wrong-table tr:hover td { background: #fafbff; }
.td-word { font-weight: 700; }
.td-count { color: var(--err); font-weight: 700; }
.td-date { color: var(--ink-2); font-size: 12px; white-space: nowrap; }
.td-del { border: none; background: none; color: #b9bccd; cursor: pointer; font-size: 15px; }
.td-del:hover { color: var(--err); }
.td-rate { font-weight: 700; }
.td-acc-good { color: var(--ok); } .td-acc-mid { color: var(--warn); } .td-acc-bad { color: var(--err); }
.empty { text-align: center; color: var(--ink-2); padding: 40px 0; line-height: 2; }

/* ---------- 统计 ---------- */
.stats-wrap { display: flex; flex-direction: column; gap: 16px; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.stat-cards .card { text-align: center; padding: 18px 10px; }
.stat-cards b { font-size: 26px; display: block; margin-bottom: 4px; }
.stat-cards span { font-size: 12px; color: var(--ink-2); }
.chart { display: flex; align-items: flex-end; gap: 6px; height: 160px; padding-top: 10px; }
.chart .bar-wrap { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 4px; height: 100%; justify-content: flex-end; min-width: 0; }
.chart .bar { width: 100%; max-width: 34px; border-radius: 5px 5px 0 0; background: linear-gradient(180deg, var(--primary), var(--primary-2)); position: relative; min-height: 2px; }
.chart .bar:hover::after {
  content: attr(data-tip); position: absolute; bottom: calc(100% + 6px); left: 50%;
  transform: translateX(-50%); background: #2a2e45; color: #fff; font-size: 11px;
  padding: 4px 8px; border-radius: 6px; white-space: nowrap; z-index: 2;
}
.chart .bar-lb { font-size: 10px; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.ch-stat-row { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; font-size: 13px; }
.ch-stat-row .name { width: 170px; flex-shrink: 0; }
.ch-stat-row .bar-track { flex: 1; height: 10px; background: #e8eaf5; border-radius: 5px; overflow: hidden; }
.ch-stat-row .bar-fill { height: 100%; border-radius: 5px; background: linear-gradient(90deg, var(--primary), var(--primary-2)); }
.ch-stat-row .val { width: 90px; text-align: right; color: var(--ink-2); flex-shrink: 0; }

/* ---------- toast ---------- */
.toast {
  position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%);
  background: #2a2e45; color: #fff; padding: 10px 22px; border-radius: 12px;
  font-size: 14px; z-index: 99; animation: fadein .2s; box-shadow: 0 6px 20px rgba(0,0,0,.25);
}

@media (max-width: 640px) {
  .answer-area { flex-direction: column; }
  .practice-actions { flex-direction: column; gap: 10px; }
  .settings-row { gap: 14px; }
  .wrong-toolbar-btns { width: 100%; }
  .wrong-toolbar-btns .btn { flex: 1; }
  .summary-actions .btn { width: 100%; }
  .ch-stat-row .name { width: 100px; }
}