:root{
  --bg:#f5f6f8; --card:#ffffff; --ink:#1e2430; --muted:#6b7280;
  --line:#e6e8ec; --line2:#eef0f3;
  --primary:#2f6feb; --primary-d:#215bcc;
  --good:#15a34a; --good-bg:#eafaf0; --bad:#dc2626; --bad-bg:#fdeded;
  --r:14px; --shadow:0 1px 3px rgba(20,30,50,.06),0 8px 24px rgba(20,30,50,.05);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:'Segoe UI','Microsoft YaHei',system-ui,sans-serif;color:var(--ink);
  background:var(--bg);min-height:100%;-webkit-font-smoothing:antialiased}
.app{max-width:860px;margin:0 auto;padding:22px 18px 56px}

.topbar{display:flex;align-items:center;gap:10px;margin-bottom:20px}
.brand{font-size:19px;font-weight:800;letter-spacing:.3px}
.brand span{color:var(--primary)}
.topbar .spacer{flex:1}
.link{border:none;background:none;color:var(--muted);font:inherit;font-size:14px;font-weight:600;
  cursor:pointer;padding:6px 10px;border-radius:8px}
.link:hover{color:var(--primary);background:#eef2fb}

.screen{display:none}
.screen.active{display:block}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:22px}
.card + .card{margin-top:14px}
h2.title{font-size:18px;margin-bottom:3px}
.sub{color:var(--muted);font-size:13.5px;margin-bottom:16px;line-height:1.6}

.btn{border:none;border-radius:10px;font-weight:700;cursor:pointer;font-family:inherit;transition:background .12s,border-color .12s}
.btn-primary{background:var(--primary);color:#fff;font-size:15px;padding:12px 22px}
.btn-primary:hover{background:var(--primary-d)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line);font-size:14px;padding:11px 18px}
.btn-ghost:hover{border-color:#cdd2da;background:#fafbfc}
.btn-quiet{background:#f2f4f7;color:var(--muted);font-size:14px;padding:11px 18px}
.btn-quiet:hover{background:#e9edf2;color:var(--ink)}
.row-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}

/* 词库列表(首页) */
.group-head{display:flex;align-items:center;justify-content:space-between;margin:16px 0 8px}
.group-label{font-size:12.5px;color:var(--muted);font-weight:700;letter-spacing:.4px}
.group-all{border:none;background:none;color:var(--primary);font:inherit;font-size:12.5px;font-weight:700;cursor:pointer;padding:2px 6px;border-radius:6px}
.group-all:hover{background:#eef2fb}
#home-tools{margin-bottom:10px}
.lib-check{width:22px;height:22px;border-radius:6px;border:1.5px solid #cfd4dc;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:800}
.lib-check.on{background:var(--primary);border-color:var(--primary)}
.lib-row.sel{border-color:var(--primary);background:#eef2fb}
.combine-bar{position:fixed;left:50%;transform:translateX(-50%);bottom:18px;width:min(820px,94vw);
  background:#fff;border:1px solid var(--line);box-shadow:0 10px 30px rgba(20,30,50,.16);border-radius:12px;
  padding:11px 14px;display:none;align-items:center;gap:10px;z-index:50}
.combine-bar.show{display:flex}
.combine-bar .spacer{flex:1}
.combine-bar #combine-count{font-size:13.5px;font-weight:700}
.lib-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,320px),1fr));gap:10px;margin-bottom:6px}
.lib-row{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:12px;
  padding:13px 15px;cursor:pointer;background:#fff;transition:border-color .12s,background .12s}
.lib-row:hover{border-color:#c3ccdb;background:#fafbff}
.lib-row .info{flex:1;min-width:0}
.lib-row .n{font-weight:700;font-size:15px}
.lib-row .m{font-size:12.5px;color:var(--muted);margin-top:3px}
.lib-row .m .todo{color:var(--primary);font-weight:700}
.mini-bar{height:6px;border-radius:99px;background:var(--line2);overflow:hidden;margin-top:8px;max-width:260px}
.mini-bar > i{display:block;height:100%;background:var(--good)}
.lib-row .go{color:var(--muted);font-size:20px}
.lib-reset{border:none;background:none;color:var(--muted);font-size:12px;cursor:pointer;padding:4px 6px;border-radius:6px}
.lib-reset:hover{color:var(--bad);background:var(--bad-bg)}

/* 筛查页 */
.quiz-top{display:flex;align-items:center;gap:12px;margin-bottom:14px;font-size:13px;color:var(--muted)}
.quiz-top .libname{font-weight:700;color:var(--ink)}
.quiz-top .spacer{flex:1}
.progress{height:8px;background:var(--line2);border-radius:99px;overflow:hidden;margin-bottom:18px}
.progress > i{display:block;height:100%;background:var(--primary);width:0;transition:width .25s}
.wordcard{border:1px solid var(--line);background:#fcfcfd;border-radius:12px;padding:40px 22px;text-align:center;position:relative}
.wordcard .en{font-size:clamp(28px,8vw,44px);font-weight:700;letter-spacing:.5px;word-break:break-word}
.wordcard .zh{font-size:clamp(22px,6.5vw,30px);font-weight:700;word-break:break-word}
.wordcard .hintzh{font-size:15px;color:var(--muted);margin-top:10px}
.wordcard .speak{position:absolute;top:14px;right:14px;border:1px solid var(--line);background:#fff;
  width:40px;height:40px;border-radius:9px;font-size:17px;cursor:pointer;color:var(--muted)}
.wordcard .speak:hover{color:var(--primary);border-color:#c3ccdb}
.options{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:10px;margin-top:16px}
.opt{border:1px solid var(--line);background:#fff;border-radius:10px;padding:15px 16px;font-size:16px;
  font-weight:600;cursor:pointer;text-align:left;transition:border-color .1s,background .1s;color:var(--ink);word-break:break-word}
.opt:hover{border-color:#c3ccdb;background:#fafbfc}
.opt .k{display:inline-block;width:20px;color:var(--muted);font-size:13px;font-weight:700}
.opt.correct{border-color:var(--good);background:var(--good-bg);color:var(--good)}
.opt.wrong{border-color:var(--bad);background:var(--bad-bg);color:var(--bad)}
.opt.reveal{border-color:var(--good);color:var(--good)}
.opt-idk{grid-column:1/-1;border-style:dashed;color:var(--muted);text-align:center}
.spellbox{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.spellbox input{flex:1;min-width:0;font-size:20px;padding:14px 16px;border:1px solid var(--line);border-radius:10px;
  font-family:inherit;outline:none}
.spellbox input:focus{border-color:var(--primary)}
.feedback{min-height:24px;margin-top:14px;font-size:15px;font-weight:600;text-align:center}
.feedback.good{color:var(--good)}.feedback.bad{color:var(--bad)}
.quiz-foot{display:flex;gap:10px;margin-top:18px}

/* 轮次小结 */
.round-hero{text-align:center;padding:14px 6px}
.round-hero .big{font-size:22px;font-weight:800;margin-bottom:16px}
.round-stats{display:flex;justify-content:center;gap:36px;margin:14px 0 6px}
.round-stats .s b{display:block;font-size:30px;font-weight:800}
.round-stats .s span{font-size:12.5px;color:var(--muted)}
.round-note{color:var(--muted);font-size:13.5px;margin-top:8px;line-height:1.6}

/* 设置面板 */
.overlay{position:fixed;inset:0;background:rgba(20,25,35,.35);display:none;align-items:center;justify-content:center;z-index:40}
.overlay.show{display:flex}
.panel{background:#fff;border-radius:16px;width:min(460px,92vw);padding:22px;box-shadow:0 20px 60px rgba(0,0,0,.2)}
.panel h3{font-size:17px;margin-bottom:16px}
.field{margin-bottom:16px}
.field > label{display:block;font-size:13.5px;font-weight:700;margin-bottom:8px}
.seg{display:flex;flex-wrap:wrap;gap:8px}
.seg .opt-btn{border:1px solid var(--line);background:#fff;border-radius:9px;padding:9px 13px;font-size:13.5px;
  font-weight:600;cursor:pointer;color:var(--ink)}
.seg .opt-btn.on{border-color:var(--primary);background:#eef2fb;color:var(--primary)}
.field.inline{display:flex;align-items:center;justify-content:space-between}
.field.inline > label{margin:0}
input[type=number]{width:80px;font-size:14px;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-family:inherit}
.switch{width:44px;height:25px;background:#d5d9e0;border-radius:99px;position:relative;cursor:pointer;transition:background .15s}
.switch.on{background:var(--primary)}
.switch::after{content:"";position:absolute;top:3px;left:3px;width:19px;height:19px;background:#fff;border-radius:50%;transition:left .15s}
.switch.on::after{left:22px}

/* 历史 */
.hist{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:11px;padding:13px 15px;margin-bottom:8px}
.hist .meta{flex:1}.hist .meta b{font-size:14.5px}.hist .meta span{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.hist .kd{font-weight:800;font-size:15px;color:var(--good)}
.empty{text-align:center;color:var(--muted);padding:34px;line-height:1.7}
.toast{position:fixed;left:50%;bottom:30px;transform:translateX(-50%) translateY(16px);opacity:0;
  background:#1e2430;color:#fff;padding:11px 20px;border-radius:10px;font-weight:600;font-size:14px;
  pointer-events:none;transition:.22s;z-index:60}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.hidden{display:none!important}
/* 试用条 + 激活 */
.trial-bar{display:flex;align-items:center;gap:12px;background:#fff7ed;border:1px solid #fed7aa;
  color:#9a6a1f;border-radius:10px;padding:10px 14px;margin-bottom:14px;font-size:13.5px;font-weight:600}
.trial-bar .btn-min{margin-left:auto;border:none;background:var(--primary);color:#fff;font:inherit;
  font-size:13px;font-weight:700;padding:7px 14px;border-radius:8px;cursor:pointer}
.trial-bar .btn-min:hover{background:var(--primary-d)}
.mc-box{display:flex;align-items:center;gap:10px}
.mc-box code{flex:1;font-size:18px;letter-spacing:1px;padding:10px 12px;background:#f2f4f7;border-radius:8px;text-align:center;font-weight:700}
#act-input{width:100%;font-size:18px;letter-spacing:1px;text-align:center;padding:11px;border:1px solid var(--line);border-radius:9px;font-family:inherit}
#act-input:focus{border-color:var(--primary);outline:none}
.act-msg{min-height:22px;font-size:13.5px;font-weight:600;margin:2px 0 6px}
.dlg-msg{font-size:15px;line-height:1.65;white-space:pre-wrap;max-height:50vh;overflow:auto}
#dlg-input{width:100%;font-size:15px;padding:10px 12px;border:1px solid var(--line);border-radius:9px;font-family:inherit;margin-top:12px}
#dlg-input:focus{border-color:var(--primary);outline:none}
.dlg-choices{display:flex;flex-direction:column;gap:9px;width:100%;margin-top:4px}
.dlg-choice{display:block;width:100%;text-align:left;padding:13px 16px;border:1px solid var(--line);background:#fff;
  border-radius:11px;font-size:15px;font-weight:700;color:var(--ink);cursor:pointer;font-family:inherit;transition:.12s}
.dlg-choice:hover{border-color:var(--primary);background:#f2f6ff}
.dlg-choice .d{display:block;font-size:12.5px;font-weight:500;color:var(--muted);margin-top:3px}
.dlg-cancel-row{width:100%;text-align:center;margin-top:8px}
.dlg-cancel-link{border:none;background:none;color:var(--muted);font:inherit;font-size:14px;cursor:pointer;padding:6px 12px}
.dlg-cancel-link:hover{color:var(--ink)}
code{background:#eef0f3;padding:1px 6px;border-radius:5px;font-size:12.5px}

/* 网页版页脚(跨推广回官网) */
.site-foot{margin:22px auto 30px;max-width:760px;text-align:center;font-size:12.5px;color:#94a3b8;line-height:1.7;padding:0 14px}
.site-foot a{color:inherit;text-decoration:underline;text-underline-offset:2px}
.site-foot a:hover{color:var(--brand,#2563eb)}