:root{
  --bg:#f4f5f9;
  --card:#ffffff;
  --line:#e6e8f0;
  --txt:#1f2333;
  --txt2:#6b7186;
  --txt3:#9aa0b4;
  --pri:#4f46e5;
  --pri-soft:#eef0ff;
  --ok:#16a34a;
  --ok-soft:#e8f7ee;
  --no:#e11d48;
  --no-soft:#fdeef1;
  --warn:#d97706;
  --sh:0 2px 10px rgba(30,35,70,.06);
  --sh2:0 8px 28px rgba(30,35,70,.12);
  --r:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--txt);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
}
#app{max-width:520px;margin:0 auto;min-height:100vh;background:var(--bg);position:relative;padding-bottom:74px}
.hidden{display:none !important}

/* header */
.hd{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.hd-title{font-size:17px;font-weight:700;letter-spacing:.5px}
.hd-sub{font-size:12px;color:var(--txt2);margin-top:1px}
.icon-btn{width:34px;height:34px;border:1px solid var(--line);background:#fff;border-radius:10px;
  font-size:15px;color:var(--txt2);cursor:pointer}
.icon-btn:active{background:var(--pri-soft)}

main{padding:14px 16px 20px}

/* 通用条 */
.bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.bar-txt{font-size:13px;color:var(--txt2)}
.link-btn{background:none;border:none;color:var(--pri);font-size:13px;cursor:pointer;padding:4px 2px}

/* 卡片 */
.card{perspective:1400px;height:56vh;min-height:330px;max-height:460px;margin-bottom:16px}
.card-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;
  transition:transform .55s cubic-bezier(.4,.2,.2,1);cursor:pointer}
.card-inner.flip{transform:rotateY(180deg)}
.face{position:absolute;inset:0;background:var(--card);border-radius:var(--r);box-shadow:var(--sh2);
  backface-visibility:hidden;-webkit-backface-visibility:hidden;padding:22px 20px;
  display:flex;flex-direction:column;overflow-y:auto}
.face.back{transform:rotateY(180deg)}
.w-row{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.word{font-size:38px;font-weight:700;letter-spacing:.5px;line-height:1.15;word-break:break-word}
.word.sm{font-size:26px}
.spk{width:42px;height:42px;flex:0 0 42px;border:none;border-radius:50%;background:var(--pri-soft);
  color:var(--pri);font-size:19px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.spk.big{width:50px;height:50px;flex-basis:50px;font-size:22px}
.spk:active{transform:scale(.92)}
.spk.playing{animation:pulse 1s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(79,70,229,.35)}50%{box-shadow:0 0 0 10px rgba(79,70,229,0)}}
.ph{color:var(--txt2);font-size:15px;margin:6px 0 14px;font-family:"Segoe UI",Arial,sans-serif}
.sec-label{font-size:11px;color:var(--txt3);letter-spacing:1.5px;margin:14px 0 6px;font-weight:600}
.en-def{font-size:16px;line-height:1.7;color:#2c3145}
.cn-def{font-size:19px;line-height:1.65;font-weight:600}
.cn-def.sub{font-size:13px;font-weight:400;color:var(--txt2);margin-top:6px;line-height:1.55}
.ex{font-size:15.5px;line-height:1.7;color:#2c3145;font-family:"Segoe UI",Georgia,serif}
.ex em{font-style:normal;color:var(--pri);font-weight:700;background:var(--pri-soft);
  padding:0 3px;border-radius:4px}
.ex-cn{font-size:13.5px;color:var(--txt2);margin-top:5px}
.meta{margin-top:auto;font-size:12px;color:var(--txt3)}
.flip-hint{margin-top:14px;text-align:center;font-size:12px;color:var(--txt3)}
.chip{display:inline-block;font-size:11px;color:var(--txt2);background:#f1f2f7;border-radius:6px;
  padding:2px 7px;margin:0 6px 5px 0}
.tip{text-align:center;font-size:12.5px;color:var(--txt2);min-height:18px}

/* 按钮 */
.actions{display:flex;gap:10px}
.btn{border:none;border-radius:12px;padding:13px 16px;font-size:15px;font-weight:600;cursor:pointer;
  flex:1;transition:transform .08s}
.btn:active{transform:scale(.975)}
.btn.primary{background:var(--pri);color:#fff;box-shadow:0 4px 14px rgba(79,70,229,.28)}
.btn.ghost{background:#fff;color:var(--txt);border:1px solid var(--line)}
.btn.block{width:100%;display:block;flex:none}
.btn.sm{padding:9px 12px;font-size:13px;border-radius:10px}
.btn:disabled{opacity:.45}
.kbd{display:inline-block;margin-left:7px;padding:1px 7px;border:1px solid var(--line);
  border-bottom-width:2px;border-radius:6px;background:var(--bg);font-size:11.5px;
  font-weight:600;color:var(--txt3);line-height:1.6;vertical-align:1px}
.btn.primary .kbd{border-color:rgba(255,255,255,.4);background:rgba(255,255,255,.18);color:#fff}
.opts .opt{position:relative;padding-left:42px}
.opt .num{position:absolute;left:12px;top:50%;transform:translateY(-50%);width:19px;height:19px;
  border-radius:5px;background:var(--bg);color:var(--txt3);font-size:11.5px;font-weight:700;
  display:flex;align-items:center;justify-content:center}

/* 分段控件 */
.seg{display:flex;background:#e9ebf2;border-radius:12px;padding:4px;margin-bottom:14px}
.seg-b{flex:1;border:none;background:none;padding:9px;border-radius:9px;font-size:14px;
  color:var(--txt2);cursor:pointer;font-weight:600}
.seg-b.on{background:#fff;color:var(--pri);box-shadow:var(--sh)}

.panel{background:var(--card);border-radius:var(--r);padding:18px;box-shadow:var(--sh)}
.panel-row{display:flex;justify-content:space-between;padding:7px 0;font-size:14px;color:var(--txt2)}
.panel-row b{color:var(--txt);font-size:16px}
.hint{font-size:12.5px;color:var(--txt3);margin:10px 0 14px;line-height:1.6}

/* 测验 */
.qbar{height:5px;background:#e9ebf2;border-radius:3px;overflow:hidden;margin-bottom:16px}
.qbar-in{height:100%;width:0;background:var(--pri);border-radius:3px;transition:width .3s}
.listen{margin:10px auto 18px;width:112px;height:112px;border-radius:50%;background:var(--pri-soft);
  color:var(--pri);display:flex;flex-direction:column;align-items:center;justify-content:center;
  cursor:pointer;gap:6px;border:none}
.listen:active{transform:scale(.95)}
.listen-ic{font-size:34px}
.listen-t{font-size:12px}
.ans{width:100%;border:1.5px solid var(--line);border-radius:12px;padding:14px;font-size:17px;
  outline:none;background:#fff;color:var(--txt);text-align:center;letter-spacing:.5px}
.ans:focus{border-color:var(--pri)}
.ans.ok{border-color:var(--ok);background:var(--ok-soft)}
.ans.no{border-color:var(--no);background:var(--no-soft)}
.q-word{font-size:24px;font-weight:700;text-align:center;margin:6px 0 8px}
.q-prompt{background:var(--card);border-radius:var(--r);padding:18px;margin-bottom:14px;box-shadow:var(--sh)}
.q-cn{font-size:19px;font-weight:600;line-height:1.6}
.q-pos{font-size:12px;color:var(--txt3);margin-top:6px}
.opts{display:flex;flex-direction:column;gap:9px}
.opt{background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:13px 14px;font-size:15px;
  cursor:pointer;text-align:left;color:var(--txt);line-height:1.5}
.opt:active{transform:scale(.99)}
.opt.sel-ok{border-color:var(--ok);background:var(--ok-soft)}
.opt.sel-no{border-color:var(--no);background:var(--no-soft)}
.opt.dim{opacity:.5}
.res{text-align:center;background:var(--card);border-radius:var(--r);padding:22px 18px;box-shadow:var(--sh)}
.res-ic{font-size:44px;line-height:1}
.res-ic.ok{color:var(--ok)}
.res-ic.no{color:var(--no)}
.res-t{font-size:19px;font-weight:700;margin:8px 0}
.res-detail{font-size:14px;color:var(--txt2);margin:10px 0 18px;line-height:1.7}
.res-detail b{color:var(--txt)}
.done-n{font-size:40px;font-weight:700;color:var(--pri);text-align:center}
.done-t{text-align:center;color:var(--txt2);margin-bottom:14px;font-size:14px}
.wrong-item{display:flex;justify-content:space-between;align-items:center;padding:8px 0;
  border-top:1px solid var(--line);font-size:14px}
.wrong-item span{color:var(--no);font-weight:600}

/* 回顾 */
.stat-row{display:flex;gap:10px;margin-bottom:14px}
.stat{flex:1;background:var(--card);border-radius:14px;padding:12px;text-align:center;box-shadow:var(--sh)}
.stat-n{font-size:22px;font-weight:700}
.stat-l{font-size:11px;color:var(--txt3);margin-top:2px}
.day{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);margin-bottom:12px;overflow:hidden}
.day-hd{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;cursor:pointer}
.day-d{font-weight:700;font-size:15px}
.day-s{font-size:12px;color:var(--txt2);margin-top:2px}
.day-n{background:var(--pri-soft);color:var(--pri);font-size:13px;font-weight:700;
  border-radius:20px;padding:3px 11px}
.day-bd{border-top:1px solid var(--line);padding:4px 0 10px}
.day-acts{display:flex;gap:8px;padding:10px 14px 4px}
.tw{overflow-x:auto;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:12.5px}
th,td{padding:7px 6px;text-align:center;border-bottom:1px solid var(--line);white-space:nowrap}
th{color:var(--txt3);font-weight:600;font-size:11px;background:#fafbfe}
td.w,th.w{text-align:left;position:sticky;left:0;background:#fff;z-index:1;min-width:96px}
th.w{background:#fafbfe}
td.w b{display:block;font-size:14px}
td.w i{font-style:normal;color:var(--txt3);font-size:11px}
.mk{font-weight:700;font-size:14px}
.mk.ok{color:var(--ok)}
.mk.no{color:var(--no)}
.mk.pd{color:var(--warn)}
.mk.none{color:#c9ccd8}
.mini-spk{border:none;background:var(--pri-soft);color:var(--pri);border-radius:50%;width:26px;height:26px;
  font-size:12px;cursor:pointer;flex:0 0 26px}
.empty{text-align:center;color:var(--txt3);padding:40px 20px;font-size:14px;line-height:1.9}

/* 底部导航 */
.tabbar{position:fixed;bottom:0;left:0;right:0;max-width:520px;margin:0 auto;display:flex;
  background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-top:1px solid var(--line);z-index:30}
.tb{flex:1;border:none;background:none;padding:8px 0 10px;color:var(--txt3);font-size:11px;cursor:pointer;
  display:flex;flex-direction:column;align-items:center;gap:2px}
.tb span{font-size:19px;line-height:1}
.tb.on{color:var(--pri);font-weight:700}

/* 弹层 */
.modal{position:fixed;inset:0;z-index:50;display:flex;align-items:flex-end;justify-content:center}
.modal-bg{position:absolute;inset:0;background:rgba(20,22,40,.42)}
.modal-box{position:relative;width:100%;max-width:520px;max-height:80vh;background:#fff;
  border-radius:18px 18px 0 0;display:flex;flex-direction:column;animation:up .22s ease}
@keyframes up{from{transform:translateY(30px);opacity:.5}to{transform:none;opacity:1}}
.modal-hd{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;
  border-bottom:1px solid var(--line);font-weight:700}
.modal-bd{padding:14px 16px 22px;overflow-y:auto}
.set-row{display:flex;align-items:center;justify-content:space-between;padding:11px 0;
  border-bottom:1px solid var(--line);font-size:14px}
.set-row:last-child{border:none}
.set-row select,.set-row input[type=number],.set-row input[type=text]{border:1px solid var(--line);
  border-radius:8px;padding:6px 8px;font-size:14px;background:#fff;color:var(--txt);max-width:200px}
.set-row input[type=text]{flex:0 0 auto;width:200px;font-family:inherit}
.set-sec{margin:20px 0 2px;font-size:13px;font-weight:700;color:var(--txt2);
  border-top:1px solid var(--line);padding-top:15px}
.lst{width:100%;border-collapse:collapse;font-size:13.5px}
.lst td{padding:9px 4px;border-bottom:1px solid var(--line);text-align:left}
.lst td:last-child{text-align:right;color:var(--txt2);font-size:12.5px;max-width:52%}
.lst b{font-size:15px}

.toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(12px);
  background:rgba(28,30,48,.92);color:#fff;padding:10px 18px;border-radius:20px;font-size:13.5px;
  opacity:0;pointer-events:none;transition:.25s;z-index:60;max-width:80%;text-align:center}
.toast.on{opacity:1;transform:translateX(-50%)}