:root{
  --primary:#7C3AED;
  --primary-d:#6D28D9;
  --primary-l:#EDE9FE;
  --primary-xl:#F5F3FF;
  --ink:#111827;
  --ink-2:#374151;
  --muted:#6B7280;
  --muted-2:#9CA3AF;
  --line:#E5E7EB;
  --line-2:#F3F4F6;
  --bg:#F8F8FB;
  --card:#FFFFFF;
  --ok:#10B981;
  --ok-l:#ECFDF5;
  --bad:#EF4444;
  --bad-l:#FEF2F2;
  --warn:#F59E0B;
  --warn-l:#FFFBEB;
  --r:16px;
  --r-s:10px;
  --shadow:0 1px 2px rgba(16,24,40,.04), 0 8px 24px -12px rgba(16,24,40,.12);
  --shadow-l:0 1px 2px rgba(16,24,40,.05);
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--ink);
  font:15px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  -webkit-font-smoothing:antialiased;
  display:flex;flex-direction:column;min-height:100vh;
}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.25}
p{margin:0}

/* ---------- topbar ---------- */
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.topbar-inner{max-width:1120px;margin:0 auto;padding:0 20px;height:62px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--primary),#A78BFA);color:#fff;display:grid;place-items:center;font-weight:800;font-size:13px;letter-spacing:.5px}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:15px}
.brand-text em{font-style:normal;font-size:11px;color:var(--muted-2)}
.nav{display:flex;gap:2px;margin-left:auto;flex-wrap:wrap}
.nav a{position:relative;padding:8px 13px;border-radius:9px;font-size:14px;color:var(--ink-2);white-space:nowrap}
.nav a:hover{background:var(--line-2)}
.nav a.on{background:var(--primary-l);color:var(--primary-d);font-weight:600}
.nav-badge{display:inline-block;min-width:17px;height:17px;padding:0 5px;margin-left:5px;border-radius:9px;background:var(--bad);color:#fff;font-size:11px;line-height:17px;text-align:center;vertical-align:1px}

/* ---------- layout ---------- */
.app{flex:1;width:100%;max-width:1120px;margin:0 auto;padding:26px 20px 60px}
.page-head{display:flex;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.page-head h1{font-size:22px}
.page-head .sub{color:var(--muted);font-size:13px}
.crumb{font-size:13px;color:var(--muted);margin-bottom:10px;display:flex;gap:7px;align-items:center;flex-wrap:wrap}
.crumb a:hover{color:var(--primary)}
.crumb span.sep{color:var(--muted-2)}

/* ---------- cards / buttons ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow-l)}
.pad{padding:18px}
.grid{display:grid;gap:14px}
.g-auto{grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.g-4{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 16px;border-radius:var(--r-s);font-size:14px;font-weight:600;border:1px solid transparent;transition:.15s;white-space:nowrap}
.btn.primary{background:var(--primary);color:#fff}
.btn.primary:hover{background:var(--primary-d)}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink-2)}
.btn.ghost:hover{border-color:#D1D5DB;background:var(--line-2)}
.btn.soft{background:var(--primary-l);color:var(--primary-d)}
.btn.soft:hover{background:#E0D9FD}
.btn.danger{background:var(--bad-l);color:#B91C1C}
.btn.danger:hover{background:#FEE2E2}
.btn.sm{padding:6px 12px;font-size:13px;border-radius:8px}
.btn.lg{padding:13px 26px;font-size:16px;border-radius:12px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-row{display:flex;gap:10px;flex-wrap:wrap}

.tag{display:inline-block;padding:3px 9px;border-radius:99px;font-size:12px;font-weight:600;background:var(--line-2);color:var(--muted)}
.tag.p{background:var(--primary-l);color:var(--primary-d)}
.tag.ok{background:var(--ok-l);color:#047857}
.tag.warn{background:var(--warn-l);color:#B45309}

/* ---------- hero ---------- */
.hero{background:linear-gradient(135deg,#7C3AED,#9333EA 55%,#A855F7);border-radius:20px;color:#fff;padding:30px 30px 28px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-70px;top:-70px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.11)}
.hero:before{content:"";position:absolute;right:60px;bottom:-110px;width:200px;height:200px;border-radius:50%;background:rgba(255,255,255,.08)}
.hero h1{font-size:27px;letter-spacing:.2px}
.hero p{margin-top:9px;opacity:.92;font-size:14px;max-width:560px}
.hero .btn-row{margin-top:20px;position:relative;z-index:1}
.hero .btn.primary{background:#fff;color:var(--primary-d)}
.hero .btn.primary:hover{background:#F5F3FF}
.hero .btn.ghost{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.35);color:#fff}
.hero .btn.ghost:hover{background:rgba(255,255,255,.26)}

.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;margin-top:18px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:15px 17px;box-shadow:var(--shadow-l)}
.stat .k{font-size:12px;color:var(--muted);font-weight:600;letter-spacing:.3px}
.stat .v{font-size:26px;font-weight:800;margin-top:3px;font-variant-numeric:tabular-nums}
.stat .v small{font-size:13px;font-weight:600;color:var(--muted-2);margin-left:3px}
.stat.p .v{color:var(--primary)}

/* ---------- section ---------- */
.sec{margin-top:30px}
.sec-head{display:flex;align-items:baseline;gap:10px;margin-bottom:12px}
.sec-head h2{font-size:17px}
.sec-head .more{margin-left:auto;font-size:13px;color:var(--primary);font-weight:600}

/* ---------- pack card ---------- */
.pack{display:flex;gap:13px;padding:15px;align-items:center;transition:.15s;cursor:pointer}
.pack:hover{border-color:#C4B5FD;box-shadow:var(--shadow);transform:translateY(-1px)}
.pack .cover{width:46px;height:58px;border-radius:8px;flex:none;display:grid;place-items:center;color:#fff;font-weight:800;font-size:17px;box-shadow:0 3px 10px -3px rgba(16,24,40,.3)}
.pack .meta{min-width:0;flex:1}
.pack .meta .t{font-weight:700;font-size:15px}
.pack .meta .s{font-size:12px;color:var(--muted);margin-top:2px}
.pack .meta .bar{margin-top:8px}

.bar{height:6px;border-radius:99px;background:var(--line-2);overflow:hidden}
.bar>i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--primary),#A78BFA);transition:width .4s}

.grade-block{margin-top:22px}
.grade-title{display:flex;align-items:center;gap:9px;font-size:14px;font-weight:700;color:var(--ink-2);margin-bottom:10px}
.grade-title .dot{width:8px;height:8px;border-radius:50%;background:var(--primary)}
.grade-title .n{font-weight:500;color:var(--muted-2);font-size:12px}

/* ---------- unit list ---------- */
.unit{display:flex;align-items:center;gap:13px;padding:13px 16px;border-bottom:1px solid var(--line-2);cursor:pointer;transition:.12s}
.unit:last-child{border-bottom:none}
.unit:hover{background:var(--primary-xl)}
.unit .no{width:34px;height:34px;border-radius:9px;background:var(--line-2);color:var(--ink-2);display:grid;place-items:center;font-weight:700;font-size:13px;flex:none}
.unit.done .no{background:var(--ok-l);color:#047857}
.unit .info{flex:1;min-width:0}
.unit .info .t{font-weight:600;font-size:14.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.unit .info .s{font-size:12px;color:var(--muted-2);margin-top:1px}
.unit .prog{width:110px;flex:none}
.unit .go{flex:none;color:var(--muted-2);font-size:18px;line-height:1}
.list-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow-l)}
.list-head{padding:13px 16px;border-bottom:1px solid var(--line);background:var(--line-2);display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.list-head strong{font-size:14px}
.list-head .sp{margin-left:auto}

/* ---------- search ---------- */
.search{position:relative;flex:1;min-width:200px;max-width:340px}
.search input{width:100%;padding:9px 13px 9px 34px;border:1px solid var(--line);border-radius:var(--r-s);font-size:14px;background:#fff;outline:none;transition:.15s}
.search input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-l)}
.search .ico{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--muted-2);font-size:14px}

/* ---------- word table ---------- */
.wtable{width:100%;border-collapse:collapse}
.wtable th,.wtable td{padding:10px 16px;text-align:left;border-bottom:1px solid var(--line-2);font-size:14px}
.wtable th{font-size:12px;color:var(--muted);font-weight:600;background:var(--line-2)}
.wtable tr:last-child td{border-bottom:none}
.wtable .en{font-weight:700;font-family:var(--mono);font-size:14.5px}
.wtable .ph{font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.wtable tr:hover td{background:var(--primary-xl)}

/* ---------- study ---------- */
.study{max-width:720px;margin:0 auto}
.study-top{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.study-top .bar{flex:1}
.study-top .n{font-size:13px;font-weight:700;color:var(--ink-2);font-variant-numeric:tabular-nums;white-space:nowrap}
.study-top .acc{font-size:13px;font-weight:700;white-space:nowrap}

.stage{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:38px 30px 30px;text-align:center;position:relative;overflow:hidden}
.stage .hint-top{position:absolute;top:13px;left:0;right:0;font-size:12px;color:var(--muted-2)}
.stage .cn{font-size:32px;font-weight:800;letter-spacing:.5px}
.stage .ph{font-family:var(--mono);font-size:15px;color:var(--muted);margin-top:8px}
.stage .ph button{color:var(--primary);font-size:13px;font-weight:600;margin-left:8px}
.slots{display:flex;gap:9px;justify-content:center;flex-wrap:wrap;margin:30px 0 6px;min-height:62px}
.slot{width:52px;height:62px;border-radius:12px;border:2px solid var(--line);background:#fff;display:grid;place-items:center;font-family:var(--mono);font-size:28px;font-weight:700;color:var(--ink);transition:.12s}
.slot.filled{border-color:var(--primary);background:var(--primary-l);color:var(--primary-d)}
.slot.cur{border-color:var(--primary);border-width:2px;box-shadow:0 0 0 4px var(--primary-l)}
.slot.cur:after{content:"";width:2px;height:26px;background:var(--primary);animation:blink 1s steps(2) infinite}
.slot.cur.filled:after{display:none}
.slot.space{border-style:dashed;background:var(--line-2);color:var(--muted)}
.slot.space.filled{background:var(--primary-l);border-style:solid}
.slot.wide{width:auto;min-width:52px;padding:0 8px;font-size:20px;font-family:inherit;font-weight:600}
@keyframes blink{50%{opacity:0}}
.stage.shake{animation:shake .3s}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-9px)}40%{transform:translateX(8px)}60%{transform:translateX(-6px)}80%{transform:translateX(4px)}}
.stage.wrong{background:var(--bad-l);border-color:#FCA5A5}
.stage.right{background:var(--ok-l);border-color:#6EE7B7}
.stage.flash-ok{animation:flashok .45s}
@keyframes flashok{0%{background:var(--ok-l)}100%{background:var(--card)}}

.stage .big-input{margin:26px auto 4px;display:flex;gap:10px;max-width:460px}
.stage .big-input input{flex:1;padding:14px 16px;border:2px solid var(--line);border-radius:12px;font-size:22px;font-family:var(--mono);outline:none;text-align:center;letter-spacing:2px;background:#fff;color:var(--ink)}
.stage .big-input input:focus{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-l)}
.stage .big-input input.ok{border-color:var(--ok);background:var(--ok-l)}
.stage .big-input input.no{border-color:var(--bad);background:var(--bad-l)}
.stage .actions{margin-top:22px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.stage .feedback{margin-top:16px;font-size:14px;font-weight:600;min-height:20px}
.stage .feedback.ok{color:#047857}
.stage .feedback.no{color:#B91C1C}

.combo{position:absolute;top:12px;right:16px;font-size:12px;font-weight:700;color:var(--warn)}
.kbd-hint{margin-top:22px;font-size:12px;color:var(--muted-2);line-height:1.9}
.kbd{display:inline-block;padding:1px 6px;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;background:#fff;font-family:var(--mono);font-size:11px;color:var(--ink-2)}

/* ---------- result ---------- */
.result{text-align:center;padding:34px 26px}
.result .ring{width:132px;height:132px;margin:0 auto 12px}
.result h2{font-size:22px}
.result .sub{color:var(--muted);margin-top:6px}
.result .grid4{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:12px;margin:24px 0}
.result .grid4 .box{background:var(--line-2);border-radius:12px;padding:13px}
.result .grid4 .box .k{font-size:12px;color:var(--muted);font-weight:600}
.result .grid4 .box .v{font-size:21px;font-weight:800;font-variant-numeric:tabular-nums}
.wrong-list{text-align:left;margin-top:8px}
.wrong-list .row{display:flex;align-items:center;gap:10px;padding:9px 13px;border-radius:9px;background:var(--bad-l);margin-bottom:6px}
.wrong-list .row .en{font-family:var(--mono);font-weight:700}
.wrong-list .row .cn{color:var(--muted);font-size:13px;margin-left:auto}

/* ---------- empty ---------- */
.empty{text-align:center;padding:54px 20px;color:var(--muted)}
.empty .ico{font-size:38px;opacity:.35}
.empty h3{margin:12px 0 5px;font-size:16px;color:var(--ink-2)}

/* ---------- toast ---------- */
.toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 20px;border-radius:99px;font-size:14px;z-index:200;box-shadow:0 10px 30px -8px rgba(0,0,0,.4);animation:pop .2s}
@keyframes pop{from{opacity:0;transform:translate(-50%,8px)}}

/* ---------- footer ---------- */
.foot{max-width:1120px;margin:0 auto;padding:0 20px 34px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--muted-2)}
.foot-stat{font-variant-numeric:tabular-nums}

/* ---------- settings ---------- */
.field{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line-2);flex-wrap:wrap}
.field:last-child{border-bottom:none}
.field .lbl{flex:1;min-width:180px}
.field .lbl .t{font-weight:600;font-size:14px}
.field .lbl .d{font-size:12.5px;color:var(--muted);margin-top:2px}
.field select,.field input[type=number]{padding:8px 11px;border:1px solid var(--line);border-radius:9px;font-size:14px;background:#fff;outline:none;min-width:120px}
.field select:focus,.field input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-l)}
.switch{position:relative;width:44px;height:25px;border-radius:99px;background:var(--line);transition:.18s;flex:none}
.switch.on{background:var(--primary)}
.switch:after{content:"";position:absolute;top:3px;left:3px;width:19px;height:19px;border-radius:50%;background:#fff;transition:.18s;box-shadow:0 1px 3px rgba(0,0,0,.2)}
.switch.on:after{left:22px}

/* ---------- 教材版本标签 ---------- */
.pack .meta .t .tag{font-size:10px;padding:1px 6px;margin-left:3px;vertical-align:1px;font-weight:600}
.page-head h1 .tag{font-size:12px;vertical-align:4px;margin-left:6px}

/* ---------- responsive ---------- */
@media (max-width:720px){
  .topbar-inner{height:auto;padding:9px 14px;flex-wrap:wrap;gap:10px}
  .nav{width:100%;margin-left:0;overflow-x:auto;padding-bottom:2px}
  .nav a{padding:7px 11px;font-size:13px}
  .app{padding:18px 14px 50px}
  .hero{padding:22px 20px}
  .hero h1{font-size:22px}
  .stage{padding:30px 16px 24px}
  .stage .cn{font-size:25px}
  .slot{width:40px;height:50px;font-size:22px;border-radius:10px}
  .slots{gap:6px}
  .wtable th:nth-child(2),.wtable td:nth-child(2){display:none}
  .unit .prog{width:70px}
}