:root{
  --bg:#0f1115;
  --bg2:#171a21;
  --bg3:#1e222b;
  --line:#2a2f3a;
  --txt:#e8ecf3;
  --txt2:#98a2b3;
  --txt3:#6b7686;
  --accent:#4f8cff;
  --accent2:#6ea8ff;
  --green:#2ecc71;
  --red:#ff5c5c;
  --amber:#ffb020;
  --radius:16px;
  --safe-b:env(safe-area-inset-bottom,0px);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro SC","PingFang SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
input,textarea,select,button{font-family:inherit;font-size:16px;color:inherit}

/* ---------- 视图 ---------- */
.view{display:none;min-height:100vh;padding-bottom:calc(70px + var(--safe-b))}
.view.active{display:block}
.view.practice{padding-bottom:var(--safe-b)}
.view#view-done{padding-bottom:var(--safe-b)}

.topbar{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;gap:12px;justify-content:space-between;
  padding:14px 18px;
  background:rgba(15,17,21,.86);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.topbar h1{font-size:19px;margin:0;font-weight:600;letter-spacing:.3px}
.topstat{font-size:13px;color:var(--txt2)}

.pad{padding:16px 16px 40px;max-width:720px;margin:0 auto}

/* ---------- 卡片 ---------- */
.cards{display:flex;flex-direction:column;gap:12px;margin-bottom:16px}
.card{
  display:block;width:100%;text-align:left;
  background:var(--bg2);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:16px 18px;
  cursor:pointer;
  transition:.15s;
  position:relative;
  overflow:hidden;
}
.card:active{transform:scale(.985);background:var(--bg3)}
.card-label{font-size:13px;color:var(--txt2);margin-bottom:6px;letter-spacing:.5px}
.card-num{display:flex;align-items:baseline;gap:6px;margin-bottom:5px}
.card-num span{font-size:32px;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums}
.card-num small{font-size:13px;color:var(--txt3);font-weight:400}
.card-sub{font-size:12.5px;color:var(--txt3)}
.card .bar{height:4px;background:var(--bg3);border-radius:2px;margin-top:11px;overflow:hidden}
.card .bar i{display:block;height:100%;border-radius:2px;transition:width .45s ease}
.card-new .card-num span{color:var(--accent2)}
.card-new .bar i{background:var(--accent)}
.card-review .card-num span{color:var(--amber)}
.card-review .bar i{background:var(--amber)}
.card-mastered .card-num span{color:var(--green)}
.card-mastered .bar i{background:var(--green);opacity:.55}

/* ---------- 面板 ---------- */
.panel{
  background:var(--bg2);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px;margin-bottom:14px;
}
.panel-title{font-size:13px;color:var(--txt2);margin-bottom:12px;letter-spacing:.5px}

.forecast{display:flex;align-items:flex-end;gap:8px;height:82px}
.forecast .fd{flex:1;display:flex;flex-direction:column;align-items:center;gap:5px;height:100%;justify-content:flex-end}
.forecast .fb{width:100%;background:var(--bg3);border-radius:5px;min-height:3px;transition:height .4s}
.forecast .fd.today .fb{background:var(--accent)}
.forecast .fn{font-size:11px;color:var(--txt3);font-variant-numeric:tabular-nums}
.forecast .fc{font-size:10.5px;color:var(--txt3)}

.weekbars{display:flex;align-items:flex-end;gap:8px;height:70px}
.weekbars .wd{flex:1;display:flex;flex-direction:column;align-items:center;gap:5px;height:100%;justify-content:flex-end}
.weekbars .wb{width:100%;background:linear-gradient(180deg,var(--accent),#3465c4);border-radius:5px;min-height:3px}
.weekbars .wl{font-size:10.5px;color:var(--txt3)}

.empty-hint{
  text-align:center;color:var(--txt3);font-size:13.5px;padding:24px 12px;line-height:1.7;
}
.hint{color:var(--txt3);font-size:12.5px;line-height:1.7;margin:0 0 12px}
.hint code{background:var(--bg3);padding:1px 6px;border-radius:5px;font-size:12px;color:var(--accent2)}

/* ---------- 按钮 ---------- */
.btn{
  border:none;border-radius:12px;padding:13px 18px;font-weight:600;cursor:pointer;
  background:var(--bg3);color:var(--txt);transition:.15s;
}
.btn:active{transform:scale(.98);opacity:.85}
.btn.primary{background:var(--accent);color:#fff}
.btn.big{padding:17px;font-size:17px}
.btn.block{width:100%;margin-top:10px}
.btn-ghost{
  background:transparent;border:1px solid var(--line);color:var(--txt2);
  border-radius:10px;padding:8px 14px;font-size:14px;cursor:pointer;transition:.15s;
}
.btn-ghost:active{background:var(--bg3)}
.btn-ghost.small{padding:7px 12px;font-size:13px}
.btn-ghost.danger{color:var(--red);border-color:rgba(255,92,92,.35)}
.file-btn{display:inline-flex;align-items:center;gap:6px}

.row{display:flex;gap:10px;align-items:center}
.row.wrap{flex-wrap:wrap}
.field{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px solid rgba(42,47,58,.6)}
.field:last-child{border-bottom:none}
.field label{font-size:14.5px;color:var(--txt);flex:1}
.field input[type=number],.field input[type=text],.field input[type=password]{
  background:var(--bg3);border:1px solid var(--line);border-radius:9px;
  padding:8px 11px;width:150px;outline:none;font-size:14px;
}
.field input:focus{border-color:var(--accent)}
.check{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--txt2);cursor:pointer}
.check input{accent-color:var(--accent);width:16px;height:16px}

.switch{position:relative;width:46px;height:27px;flex:0 0 auto;cursor:pointer}
.switch input{opacity:0;width:0;height:0;position:absolute}
.switch i{
  position:absolute;inset:0;background:var(--bg3);border-radius:14px;transition:.22s;border:1px solid var(--line);
}
.switch i:before{
  content:'';position:absolute;width:19px;height:19px;border-radius:50%;
  background:var(--txt2);left:3px;top:3px;transition:.22s;
}
.switch input:checked + i{background:var(--accent);border-color:var(--accent)}
.switch input:checked + i:before{transform:translateX(19px);background:#fff}

/* ---------- 导入 ---------- */
.importbox{background:var(--bg2);border:1px solid var(--line);border-radius:var(--radius);padding:14px;margin-bottom:14px}
.tabs{display:flex;gap:6px;margin-bottom:14px}
.tabs.small .tab{flex:1;padding:9px;font-size:13px;border-radius:9px;background:var(--bg3);border:none;color:var(--txt2);cursor:pointer;transition:.15s}
.tabs.small .tab.active{background:var(--accent);color:#fff}
.imp-pane{display:none}
.imp-pane.active{display:block}

textarea,#pasteText,#aiText{
  width:100%;background:var(--bg3);border:1px solid var(--line);border-radius:11px;
  padding:12px;outline:none;resize:vertical;line-height:1.6;font-size:14px;
}
textarea:focus{border-color:var(--accent)}
input[type=search],#fileInput{
  background:var(--bg3);border:1px solid var(--line);border-radius:10px;
  padding:10px 12px;outline:none;font-size:14px;
}
#importbox .row{margin:10px 0}

.preview{margin-top:14px;border-top:1px solid var(--line);padding-top:14px}
.pv-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.pv-count{font-size:13px;color:var(--txt2)}
.pv-list{max-height:320px;overflow-y:auto;-webkit-overflow-scrolling:touch}
.pv-item{
  display:flex;align-items:flex-start;gap:10px;padding:9px 0;border-bottom:1px solid rgba(42,47,58,.5);
}
.pv-item:last-child{border-bottom:none}
.pv-item input[type=checkbox]{margin-top:4px;accent-color:var(--accent);width:16px;height:16px;flex:0 0 auto}
.pv-body{flex:1;min-width:0}
.pv-word{font-weight:600;font-size:15px;color:var(--accent2)}
.pv-en{font-size:12.5px;color:var(--txt2);word-break:break-word}
.pv-zh{font-size:12.5px;color:var(--txt3);word-break:break-word}
.pv-dup{font-size:11px;color:var(--amber);margin-left:6px}

/* ---------- 列表 ---------- */
.searchrow{margin-bottom:12px;gap:8px}
.searchrow input{flex:1;min-width:0}
.searchrow select{
  background:var(--bg3);border:1px solid var(--line);border-radius:10px;
  padding:10px;outline:none;font-size:13.5px;
}
.wlist{display:flex;flex-direction:column;gap:8px}
.witem{
  background:var(--bg2);border:1px solid var(--line);border-radius:12px;padding:12px 14px;
  display:flex;align-items:center;gap:12px;
}
.witem-main{flex:1;min-width:0}
.witem-word{font-weight:600;font-size:15.5px;display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.witem-def{font-size:12.5px;color:var(--txt2);margin-top:2px;word-break:break-word}
.witem-zh{font-size:12.5px;color:var(--txt3);margin-top:1px;word-break:break-word}
.tag{font-size:10.5px;padding:2px 7px;border-radius:6px;font-weight:500;flex:0 0 auto}
.tag.new{background:rgba(79,140,255,.16);color:var(--accent2)}
.tag.review{background:rgba(255,176,32,.16);color:var(--amber)}
.tag.mastered{background:rgba(46,204,113,.16);color:var(--green)}
.tag.wrong{background:rgba(255,92,92,.16);color:var(--red)}
.witem-del{
  background:transparent;border:none;color:var(--txt3);font-size:19px;
  cursor:pointer;padding:4px 6px;flex:0 0 auto;
}
.witem-del:active{color:var(--red)}

/* ---------- 练习 ---------- */
.practice-top{gap:10px}
.practice-top .prog{flex:1;height:5px;background:var(--bg3);border-radius:3px;overflow:hidden}
.practice-top .prog i{display:block;height:100%;background:var(--accent);border-radius:3px;transition:width .3s}
.pcount{font-size:12.5px;color:var(--txt2);font-variant-numeric:tabular-nums;flex:0 0 auto}

.practice-main{padding:22px 16px 34px;max-width:640px;margin:0 auto}
.qcard{
  background:var(--bg2);border:1px solid var(--line);border-radius:20px;
  padding:26px 20px;text-align:center;margin-bottom:18px;position:relative;
}
.qbadge{
  position:absolute;top:14px;left:50%;transform:translateX(-50%);
  font-size:11px;padding:3px 11px;border-radius:8px;
  background:rgba(79,140,255,.16);color:var(--accent2);white-space:nowrap;
}
.qbadge.review{background:rgba(255,176,32,.16);color:var(--amber)}
.qbadge.mastered{background:rgba(46,204,113,.16);color:var(--green)}
.qdef{font-size:18.5px;line-height:1.65;margin:22px 0 0;white-space:pre-wrap;word-break:break-word}
.qdef .masked{color:var(--accent2);font-weight:600}
.qphon{font-size:14px;color:var(--txt3);margin-top:10px;font-family:Georgia,serif}
.qlen{font-size:12.5px;color:var(--txt3);margin-top:7px;letter-spacing:1px}
.qzh{
  margin-top:14px;padding-top:14px;border-top:1px dashed var(--line);
  font-size:14.5px;color:var(--txt2);white-space:pre-wrap;
}

.ansarea{margin-bottom:14px}
#ansInput{
  width:100%;background:var(--bg2);border:1px solid var(--line);border-radius:14px;
  padding:16px 18px;outline:none;font-size:21px;text-align:center;
  letter-spacing:1.2px;font-weight:500;transition:.15s;
}
#ansInput:focus{border-color:var(--accent);background:var(--bg3)}
#ansInput.wrong{border-color:var(--red);animation:shake .35s}
#ansInput.right{border-color:var(--green)}
@keyframes shake{
  0%,100%{transform:translateX(0)}
  25%{transform:translateX(-7px)}
  75%{transform:translateX(7px)}
}
.ansrow{display:flex;gap:8px;margin-top:10px;justify-content:center}

.feedback{
  background:var(--bg2);border:1px solid var(--line);border-radius:18px;padding:20px;
  animation:pop .25s ease;
}
@keyframes pop{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.fb-verdict{font-size:14px;font-weight:600;margin-bottom:10px}
.fb-verdict.ok{color:var(--green)}
.fb-verdict.bad{color:var(--red)}
.fb-verdict.near{color:var(--amber)}
.fb-word{font-size:27px;font-weight:700;letter-spacing:.5px;margin-bottom:8px;word-break:break-word}
.fb-def{font-size:14px;color:var(--txt2);line-height:1.65;white-space:pre-wrap;margin-bottom:6px}
.fb-zh{font-size:14px;color:var(--txt3);white-space:pre-wrap}
.fb-diff{font-size:13px;color:var(--txt3);margin-top:10px;font-family:ui-monospace,Menlo,monospace;letter-spacing:1px}

.done{text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:72vh;gap:6px}
.done-emoji{font-size:52px}
.done h2{font-size:21px;margin:6px 0 18px;font-weight:600}
.done-stats{
  display:flex;gap:14px;justify-content:center;margin-bottom:26px;width:100%;
}
.done-stats .ds{
  background:var(--bg2);border:1px solid var(--line);border-radius:14px;
  padding:14px 18px;flex:1;max-width:130px;
}
.done-stats .ds b{display:block;font-size:24px;font-variant-numeric:tabular-nums}
.done-stats .ds span{font-size:11.5px;color:var(--txt3)}
.done-stats .ds.ok b{color:var(--green)}
.done-stats .ds.bad b{color:var(--red)}
.done .btn{max-width:320px}

/* ---------- 底部导航 ---------- */
.nav{
  position:fixed;left:0;right:0;bottom:0;z-index:30;
  display:flex;
  background:rgba(23,26,33,.94);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-top:1px solid var(--line);
  padding-bottom:var(--safe-b);
}
.nav-btn{
  flex:1;background:transparent;border:none;color:var(--txt3);
  padding:9px 0 8px;font-size:11px;cursor:pointer;
  display:flex;flex-direction:column;align-items:center;gap:2px;transition:.15s;
}
.nav-btn span{font-size:19px;line-height:1.2}
.nav-btn.active{color:var(--accent2)}

/* ---------- toast ---------- */
.toast{
  position:fixed;bottom:calc(84px + var(--safe-b));left:50%;transform:translate(-50%,20px);
  background:rgba(40,45,56,.97);color:var(--txt);padding:11px 20px;border-radius:12px;
  font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:100;
  max-width:86vw;text-align:center;box-shadow:0 8px 26px rgba(0,0,0,.45);
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- 桌面 ---------- */
@media (min-width:700px){
  .cards{flex-direction:row}
  .card{flex:1}
  .card-num span{font-size:36px}
  .nav{max-width:720px;left:50%;transform:translateX(-50%);border-radius:16px 16px 0 0;border:1px solid var(--line);border-bottom:none}
  .view{padding-bottom:90px}
}

/* ---------- 登录页 ---------- */
.login-view{
  display:none;
  padding:0;
  min-height:100vh;
  background:
    radial-gradient(900px 480px at 50% -10%, rgba(79,140,255,.16), transparent 70%),
    var(--bg);
}
.login-view.active{display:flex}
.login-wrap{
  width:100%;max-width:400px;margin:auto;
  padding:32px 22px calc(32px + var(--safe-b));
  display:flex;flex-direction:column;justify-content:center;
}
.login-brand{text-align:center;margin-bottom:26px}
.login-logo{
  width:62px;height:62px;line-height:62px;
  margin:0 auto 14px;
  border-radius:18px;
  background:linear-gradient(160deg,var(--accent),#2f5fc4);
  color:#fff;font-size:27px;font-weight:700;
  box-shadow:0 10px 26px rgba(79,140,255,.32);
}
.login-brand h1{font-size:23px;margin:0;font-weight:600;letter-spacing:.5px}
.login-sub{font-size:12.5px;color:var(--txt3);margin:7px 0 0}
.login-card{
  background:var(--bg2);
  border:1px solid var(--line);
  border-radius:18px;
  padding:20px 18px;
}
.login-input{
  flex:1;min-width:0;width:100%;
  background:var(--bg3);
  border:1px solid var(--line);
  border-radius:12px;
  padding:14px 15px;
  outline:none;
  font-size:16px;
  transition:border-color .15s,background .15s;
}
.login-input:focus{border-color:var(--accent);background:var(--bg2)}
.login-input.err{border-color:var(--red)}
.login-foot{
  text-align:center;font-size:12px;color:var(--txt3);
  margin:20px 0 0;line-height:1.7;
}

/* 登录页激活时隐藏底部导航，避免闪现 */
body.on-login .nav{display:none !important}