:root{
  --bg:#f4f8f7;
  --card:#ffffff;
  --ink:#16211f;
  --ink-2:#5b6b68;
  --ink-3:#8fa09c;
  --line:#e6eeec;
  --accent:#25c9a0;
  --accent-2:#2fa8f5;
  --ok:#22b573;
  --bad:#ef5350;
  --warn:#f5a623;
  --shadow:0 6px 24px rgba(22,60,52,.07);
  --shadow-l:0 12px 44px rgba(22,60,52,.11);
  --r:18px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:
    radial-gradient(900px 420px at 12% -8%, #d9fff3 0%, transparent 62%),
    radial-gradient(760px 380px at 96% 4%, #dff2ff 0%, transparent 58%),
    var(--bg);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overscroll-behavior-y:contain;
}
#app{max-width:600px;margin:0 auto;min-height:100vh;display:flex;flex-direction:column;padding:0 16px}

/* ---------- 通用 ---------- */
.topbar{display:flex;align-items:center;gap:10px;padding:14px 0 6px;min-height:56px}
.topbar .back{
  width:38px;height:38px;border-radius:12px;border:none;background:#fff;box-shadow:var(--shadow);
  font-size:18px;color:var(--ink);cursor:pointer;display:grid;place-items:center;flex:0 0 auto;
}
.topbar .back:active{transform:scale(.94)}
.topbar h1{font-size:17px;margin:0;font-weight:650;letter-spacing:.2px}
.topbar .sub{font-size:12px;color:var(--ink-3);font-weight:400;margin-left:auto}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:18px}
.muted{color:var(--ink-3);font-size:13px}
.center{text-align:center}
.spacer{flex:1}
.btn{
  display:flex;align-items:center;justify-content:center;gap:8px;width:100%;
  border:none;border-radius:16px;background:var(--accent);color:#fff;font-size:16px;font-weight:650;
  padding:16px;cursor:pointer;transition:transform .08s, filter .15s;font-family:inherit;
  box-shadow:0 8px 22px rgba(37,201,160,.28);
}
.btn:active{transform:scale(.985);filter:brightness(.97)}
.btn.ghost{background:#fff;color:var(--ink);box-shadow:var(--shadow)}
.btn.line{background:#fff;color:var(--accent);box-shadow:none;border:1.5px solid var(--accent)}
.btn:disabled{opacity:.45;box-shadow:none;cursor:default}
.btn.mini{width:auto;padding:10px 16px;font-size:14px;border-radius:12px;box-shadow:none}
.row{display:flex;gap:10px}

/* ---------- 首页 ---------- */
.hero{padding:8px 2px 4px}
.hero .hi{font-size:13px;color:var(--ink-2)}
.hero .big{font-size:26px;font-weight:750;margin:6px 0 2px;letter-spacing:-.3px}
.hero .path{font-size:13px;color:var(--accent);font-weight:600}
.progress{margin:16px 0 0;height:10px;border-radius:99px;background:#e3ece9;overflow:hidden}
.progress > i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--accent),var(--accent-2));transition:width .5s}
.progress-meta{display:flex;justify-content:space-between;font-size:12px;color:var(--ink-3);margin-top:7px}
.statgrid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-top:14px}
.stat{background:var(--card);border-radius:14px;box-shadow:var(--shadow);padding:14px 12px;text-align:center}
.stat b{display:block;font-size:20px;letter-spacing:-.5px}
.stat span{font-size:11px;color:var(--ink-3)}
.unitcard{margin-top:14px;background:linear-gradient(135deg,#26cfa4,#2fa8f5);border-radius:20px;padding:18px;color:#fff;box-shadow:0 14px 34px rgba(37,180,200,.28)}
.unitcard .k{font-size:12px;opacity:.88}
.unitcard .t{font-size:20px;font-weight:750;margin:4px 0 2px}
.unitcard .d{font-size:12px;opacity:.9}
.unitcard .go{margin-top:14px;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.5);color:#fff;box-shadow:none}
.footnav{display:flex;gap:8px;padding:12px 0 22px}
.tabbtn{flex:1;border:none;background:#fff;border-radius:14px;padding:12px;font-size:13px;color:var(--ink-2);box-shadow:var(--shadow);font-family:inherit;cursor:pointer}
.tabbtn.on{background:var(--ink);color:#fff}

/* ---------- 学习卡 ---------- */
.wordhead{margin-top:4px}
.wordhead .w{font-size:40px;font-weight:760;letter-spacing:-1.2px;line-height:1.05;word-break:break-word}
.wordhead .phon{display:flex;align-items:center;gap:10px;margin-top:8px;color:var(--ink-2);font-size:14px}
.iconbtn{
  width:32px;height:32px;border-radius:50%;border:none;background:#eaf7f3;color:var(--accent);
  display:grid;place-items:center;cursor:pointer;font-size:15px
}
.iconbtn:active{transform:scale(.92)}
.pos{display:inline-block;font-size:12px;color:var(--accent);background:#e9f9f4;padding:3px 9px;border-radius:8px;margin-left:2px}
.defbox{margin-top:14px;position:relative;min-height:56px}
.defbox .veil{position:absolute;inset:0;border-radius:12px;background:repeating-linear-gradient(45deg,#eef6f4,#eef6f4 8px,#e6f2ee 8px,#e6f2ee 16px);display:grid;place-items:center;color:var(--ink-3);font-size:13px;cursor:pointer;border:1px dashed #cfe6df}
.defbox .def{font-size:19px;font-weight:600;line-height:1.5;padding:2px 0}
.section{margin-top:20px}
.section > .hd{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:650;color:var(--ink-2);margin-bottom:9px}
.section > .hd i{color:var(--accent);font-style:normal}
.sentbox{background:#f7fbfa;border:1px solid var(--line);border-radius:14px;padding:14px}
.sentbox .en{font-size:16px;line-height:1.65;font-weight:500}
.sentbox .en em{font-style:normal;color:var(--accent);font-weight:700;border-bottom:2px solid #bff0e2}
.sentbox .cn{margin-top:9px;font-size:14px;line-height:1.6;color:var(--ink-2)}
.sentbox .cn.hide{display:none}
.sentbox .tools{display:flex;gap:8px;margin-top:10px}
.chip{font-size:12px;color:var(--ink-2);background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px;cursor:pointer;font-family:inherit}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff}

/* 语境关联 */
.linkgraph{display:grid;grid-template-columns:1fr 78px 1fr;align-items:center;gap:8px;padding:24px 2px 10px}
.linkgraph .node{text-align:center;min-width:0}
.linkgraph .node b{display:block;font-size:15px;letter-spacing:-.2px;word-break:break-word}
.linkgraph .node span{display:block;font-size:12px;color:var(--ink-3);margin-top:3px}
.linkgraph .arrow{position:relative;height:2px;background:linear-gradient(90deg,#cfe9e2,#9fe0cf);border-radius:2px}
.linkgraph .arrow::after{content:"";position:absolute;right:-2px;top:-4px;width:9px;height:9px;border-top:2px solid #9fe0cf;border-right:2px solid #9fe0cf;transform:rotate(45deg)}
.linkgraph .arrow em{position:absolute;left:50%;top:-11px;transform:translateX(-50%);background:#2fd0a5;color:#fff;font-size:11px;font-style:normal;font-weight:700;padding:1px 7px;border-radius:999px;white-space:nowrap}
.linkednote{font-size:12.5px;color:var(--ink-3);line-height:1.6;text-align:center;padding:0 6px}

/* 词族 tabs */
.tabs{display:flex;gap:6px;margin-bottom:10px;overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tabs button{flex:0 0 auto;border:none;background:transparent;color:var(--ink-3);font-size:13.5px;padding:7px 11px;border-radius:10px;font-family:inherit;cursor:pointer;font-weight:600}
.tabs button.on{background:#eef8f5;color:var(--accent)}
.kvlist{display:flex;flex-direction:column;gap:9px}
.kv{display:flex;gap:10px;align-items:baseline;font-size:14.5px;line-height:1.5}
.kv b{font-weight:650;flex:0 0 auto}
.kv span{color:var(--ink-2);font-size:13.5px}

/* 定级 */
.levelrow{display:flex;gap:10px;margin-top:8px}
.lv{flex:1;border:1.5px solid var(--line);background:#fff;border-radius:14px;padding:13px 10px;font-size:14px;font-family:inherit;cursor:pointer;color:var(--ink-2);font-weight:600}
.lv.on{border-color:var(--accent);background:#eefaf6;color:var(--accent)}
.lv small{display:block;font-size:11px;font-weight:400;color:var(--ink-3);margin-top:2px}
.bottompad{height:110px}
.fixbtn{position:fixed;left:0;right:0;bottom:0;padding:12px 16px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(180deg,rgba(244,248,247,0),rgba(244,248,247,.96) 38%);z-index:20}
.fixbtn-inner{max-width:600px;margin:0 auto;display:flex;gap:10px}

/* ---------- 题 ---------- */
.qmeta{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--ink-3);margin:2px 0 10px}
.qmeta .pill{background:#fff;border-radius:999px;padding:5px 12px;box-shadow:var(--shadow);color:var(--ink-2);font-weight:600}
.yeartabs{display:flex;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.ytab{font-size:12.5px;padding:7px 12px;border-radius:10px;background:#fff;color:var(--ink-3);border:1px solid var(--line);font-family:inherit}
.ytab.on{background:#eef8f5;color:var(--accent);border-color:#c9ecdf;font-weight:700}
.qword{font-size:26px;font-weight:750;letter-spacing:-.6px}
.qsent{font-size:17px;line-height:1.7;margin-top:12px}
.qsent em{font-style:normal;color:var(--accent-2);font-weight:700;border-bottom:2px solid #b9e3ff}
.qtrans{margin-top:10px;font-size:13.5px;color:var(--ink-2);line-height:1.6;display:none}
.qtrans.show{display:block}
.opts{display:flex;flex-direction:column;gap:10px;margin-top:18px}
.opt{
  width:100%;text-align:left;border:1.5px solid var(--line);background:#fff;border-radius:14px;
  padding:15px 16px;font-size:16px;font-family:inherit;cursor:pointer;color:var(--ink);
  display:flex;align-items:center;justify-content:space-between;transition:.15s;
}
.opt:active{transform:scale(.99)}
.opt.ok{border-color:#8fe3c4;background:#eafaf3;color:#128a5c;font-weight:650}
.opt.bad{border-color:#f7b6b4;background:#fdeeee;color:#c23b38}
.opt .mk{font-size:18px}
.opt:disabled{cursor:default}

/* 填空 */
.blankline{font-size:18px;line-height:2.1;margin-top:10px}
.blankline em{font-style:normal;color:var(--accent-2);font-weight:700}
.blank{display:inline-block;min-width:92px;border-bottom:2px solid #c9dcd7;text-align:center;color:var(--accent);font-weight:700;margin:0 3px;transition:.15s}
.blank.filled{border-bottom-color:var(--accent);background:#eefaf6;border-radius:6px 6px 0 0}
.blank.err{animation:shake .3s;border-bottom-color:var(--bad)}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.blocks{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.block{border:1.5px solid var(--line);background:#fff;border-radius:12px;padding:12px 16px;font-size:16px;font-family:inherit;cursor:pointer;color:var(--ink)}
.block.used{opacity:.28;pointer-events:none}
.block.bad{background:#fdeeee;border-color:#f7b6b4;color:#c23b38}

/* 连线 */
.matchwrap{display:flex;gap:14px;margin-top:14px}
.mcol{flex:1;display:flex;flex-direction:column;gap:12px}
.mitem{
  border:1.5px solid var(--line);background:#fff;border-radius:14px;padding:14px 12px;font-size:15px;
  cursor:pointer;font-family:inherit;color:var(--ink);text-align:center;transition:.15s;line-height:1.4;min-height:62px;
  display:flex;flex-direction:column;justify-content:center;
}
.mitem small{display:block;color:var(--ink-3);font-size:11.5px;margin-top:2px}
.mitem.sel{border-color:var(--accent-2);background:#eff8ff;box-shadow:0 0 0 3px #e2f2ff}
.mitem.done{border-color:#8fe3c4;background:#eafaf3;color:#128a5c;opacity:.75}
.mitem.done small{color:#4bb28d}
.mitem.err{animation:shake .3s;border-color:var(--bad)}

/* 结果 */
.result-hero{text-align:center;padding:22px 0 8px}
.result-hero .ring{width:132px;height:132px;margin:0 auto;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--accent) 0turn,var(--accent) var(--p,0.8turn),#e6eeec var(--p,0.8turn));}
.result-hero .ring > div{width:108px;height:108px;border-radius:50%;background:#fff;display:grid;place-items:center;flex-direction:column}
.result-hero .ring b{font-size:30px;letter-spacing:-1px;display:block;line-height:1}
.result-hero .ring span{font-size:11px;color:var(--ink-3)}
.result-hero h2{margin:16px 0 4px;font-size:20px}
.result-hero p{margin:0;color:var(--ink-3);font-size:13px}
.wronglist{margin-top:16px;display:flex;flex-direction:column;gap:8px}
.wrongrow{display:flex;align-items:center;gap:10px;background:#fff;border-radius:12px;padding:11px 14px;box-shadow:var(--shadow);font-size:14px}
.wrongrow b{font-weight:650}
.wrongrow span{color:var(--ink-3);font-size:12px;margin-left:auto}

/* toast */
#toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(20px);background:rgba(22,33,31,.92);color:#fff;font-size:13.5px;padding:10px 18px;border-radius:12px;opacity:0;transition:.25s;pointer-events:none;z-index:99;max-width:80vw;text-align:center}
#toast.on{opacity:1;transform:translateX(-50%) translateY(0)}
.fadein{animation:fadein .26s ease both}
@keyframes fadein{from{opacity:0}to{opacity:1}}
/* ---------- 单元关卡地图 ---------- */
.seg{margin-top:20px}
.seg-hd{display:flex;align-items:baseline;gap:8px;font-size:16px;font-weight:700;margin:0 2px 8px;}
.seg-hd span{font-size:11.5px;color:var(--ink-3);font-weight:400;margin-left:auto}
.map{position:relative}
.map-item{display:flex;align-items:center;gap:14px;padding:7px 2px;position:relative;cursor:pointer;border-radius:14px}
.map-item:active{background:#eef6f4}
.map-item::before{content:"";position:absolute;left:29px;top:0;bottom:0;width:2px;background:#e3ede9;transform:translateX(-50%);z-index:0}
.map-item:first-child::before{top:50%}
.map-item:last-child::before{bottom:50%}
.map-item:only-child::before{display:none}
.node{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;font-size:18px;position:relative;z-index:1;flex:0 0 auto;font-weight:700}
.map-item.done .node{background:#eafaf3;border:2px solid #8fe3c4;color:#128a5c}
.map-item.current .node{background:linear-gradient(135deg,#26cfa4,#2fa8f5);color:#fff;box-shadow:0 8px 22px rgba(47,168,245,.35);animation:pulse 1.8s ease-in-out infinite}
.map-item.unlocked .node{background:#eafaf3;border:2px solid #8fe3c4;color:#128a5c}
.map-item.locked .node{background:#f2f6f5;border:2px dashed #d9e4e1;color:#b6c4c0;font-size:15px}
.nbody b{display:block;font-size:15px;letter-spacing:-.2px}
.nbody span{font-size:12px;color:var(--ink-3)}
.map-item.locked{opacity:.6}
.map-item.locked .nbody b{color:var(--ink-3)}
.map-item.current .nbody b{color:var(--accent);font-weight:750}
@keyframes pulse{0%,100%{box-shadow:0 8px 22px rgba(47,168,245,.35)}50%{box-shadow:0 8px 30px rgba(47,168,245,.6)}}
.map-item.locked .node svg{opacity:.75}
.map-item.current .node svg{margin-left:2px}