:root{
  --bg:#fff8f1; --card:#ffffff; --ink:#2b2118; --muted:#7a6a5c; --line:#f1e2d3;
  --brand:#f26b1d; --brand-2:#ffb547; --brand-soft:#fff0e3;
  --green:#22a565; --green-soft:#e6f7ee; --red:#e5484d; --red-soft:#fdecec;
  --blue:#3b82f6; --blue-soft:#e8f0fe; --purple:#8b5cf6; --purple-soft:#f1ebfe;
  --radius:18px; --shadow:0 4px 18px rgba(120,60,10,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:Nunito,system-ui,sans-serif;background:var(--bg);color:var(--ink);font-size:16px}
button{font-family:inherit;cursor:pointer}
input,select{font-family:inherit}
a{color:inherit}
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:10px;padding:10px 20px;background:#fff;border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:18px;color:var(--brand);text-decoration:none}
.logo .ic{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;font-size:22px}
.logo small{display:block;font-size:11px;color:var(--muted);font-weight:600}
.top .sp{flex:1}
.chip{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border-radius:999px;background:var(--brand-soft);font-weight:800;font-size:14px;border:0;color:var(--ink)}
.prof-btn{display:flex;align-items:center;gap:8px;padding:5px 12px 5px 5px;border-radius:999px;border:2px solid var(--line);background:#fff;font-weight:800}
.prof-btn:empty{display:none}
.prof-btn .av{width:32px;height:32px;border-radius:50%;background:var(--brand-soft);display:grid;place-items:center;font-size:20px}
.prof-btn small{display:block;font-size:11px;color:var(--muted);font-weight:700;text-align:left}
.dropdown{position:absolute;top:58px;width:300px;background:#fff;border-radius:16px;box-shadow:0 10px 40px rgba(60,30,5,.18);padding:12px;z-index:40;display:none}
.dropdown.open{display:block}
.prof-item{display:flex;align-items:center;gap:10px;width:100%;padding:10px;border-radius:12px;border:2px solid transparent;background:#fffaf5;margin-bottom:6px;text-align:left}
.prof-item.on{border-color:var(--green);background:var(--green-soft)}
.prof-item .av{font-size:26px}
.btn{border:0;border-radius:14px;padding:11px 18px;font-weight:800;font-size:15px;background:var(--brand);color:#fff;box-shadow:0 3px 0 #c4520f;transition:transform .08s;display:inline-flex;align-items:center;gap:6px;justify-content:center;text-decoration:none}
.btn:active{transform:translateY(2px);box-shadow:0 1px 0 #c4520f}
.btn.ghost{background:#fff;color:var(--ink);border:2px solid var(--line);box-shadow:none}
.btn.green{background:var(--green);box-shadow:0 3px 0 #17804c}
.btn.purple{background:var(--purple);box-shadow:0 3px 0 #6d3fd6}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:10px}
.btn[disabled]{opacity:.45;pointer-events:none}
.wrap{display:flex;max-width:1320px;margin:0 auto}
nav.side{width:230px;flex-shrink:0;padding:20px 12px;position:sticky;top:60px;height:calc(100vh - 60px);display:flex;flex-direction:column;gap:4px}
nav.side button{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:12px 14px;border-radius:14px;border:0;background:none;font-weight:700;font-size:15px;color:var(--ink)}
nav.side button:hover{background:#fff}
nav.side button.on{background:var(--brand);color:#fff}
nav.side .note{margin-top:auto;font-size:12px;color:var(--muted);background:#fff;border-radius:14px;padding:12px;line-height:1.5}
main{flex:1;min-width:0;padding:20px 20px 90px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
h1{font-size:28px;margin:6px 0 4px;font-weight:900;line-height:1.2}
h2{font-size:20px;margin:0 0 12px;font-weight:900}
h3{margin:0 0 8px}
.muted{color:var(--muted)}
.badge{display:inline-block;padding:4px 10px;border-radius:999px;font-size:12px;font-weight:800;background:var(--green-soft);color:var(--green)}
.badge.o{background:var(--brand-soft);color:var(--brand)}
.badge.p{background:var(--purple-soft);color:var(--purple)}
.badge.b{background:var(--blue-soft);color:var(--blue)}
.grid{display:grid;gap:16px}
.g2{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.between{justify-content:space-between}
.hero{display:grid;grid-template-columns:1fr 310px;gap:16px}
.mission{display:flex;gap:16px;align-items:flex-start;margin-top:14px;background:var(--brand-soft);border-radius:16px;padding:16px}
.mascot{font-size:56px;line-height:1;flex-shrink:0;animation:bob 2.4s ease-in-out infinite}
@keyframes bob{50%{transform:translateY(-6px)}}
.stages{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.stages div{background:#fff;border-radius:14px;padding:12px;font-size:13px;border:1px solid var(--line)}
.stages b{display:block;font-size:14px;margin-bottom:2px}
select.field,input.field{width:100%;padding:12px;border-radius:12px;border:2px solid var(--line);font-weight:700;font-size:14px;background:#fff}
input.field:focus,select.field:focus{outline:none;border-color:var(--brand)}
.quick button{display:block;width:100%;text-align:left;margin-top:8px;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:#fffaf5;font-weight:700;font-size:13px}
.tabs{display:flex;gap:8px;margin:20px 0 12px;flex-wrap:wrap}
.tabs button{border:0;padding:10px 16px;border-radius:999px;font-weight:800;background:#fff;color:var(--muted)}
.tabs button.on{background:var(--green);color:#fff}
.seg{display:inline-flex;background:var(--line);border-radius:12px;padding:3px}
.seg button{border:0;background:none;padding:8px 14px;border-radius:10px;font-weight:800;font-size:13px;color:var(--muted)}
.seg button.on{background:#fff;color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.08)}
.map{display:flex;flex-direction:column;gap:18px}
.stop{display:flex;gap:16px;align-items:center}
.stop:nth-child(even){flex-direction:row-reverse}
.stop .node{width:78px;height:78px;border-radius:50%;display:grid;place-items:center;font-size:34px;background:#fff;border:4px solid var(--line);flex-shrink:0;box-shadow:var(--shadow)}
.stop.cur .node{border-color:var(--brand);animation:pulse 1.8s infinite}
.stop.done .node{border-color:var(--green)}
@keyframes pulse{50%{box-shadow:0 0 0 10px rgba(242,107,29,.15)}}
.stop .info{flex:1;background:#fff;border-radius:16px;padding:14px 16px;box-shadow:var(--shadow);border:2px solid transparent}
.stop.cur .info{border-color:var(--brand)}
.tag{font-size:12px;font-weight:800;color:var(--brand)}
.stop h3{margin:2px 0 6px;font-size:17px}
.bar{height:8px;border-radius:99px;background:var(--line);overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,var(--green),#5ad08f);border-radius:99px;transition:width .4s}
.bar.p i{background:linear-gradient(90deg,var(--purple),#b197fc)}
.chest{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:center}
.keys{display:flex;gap:8px;margin:10px 0}
.keys span{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:var(--line);font-size:20px}
.keys span.on{background:#ffe7a8}
.lesson-list button{display:flex;justify-content:space-between;align-items:center;gap:10px;width:100%;text-align:left;padding:12px 14px;margin-bottom:8px;border-radius:14px;border:1px solid var(--line);background:#fff;font-weight:700;font-size:14px}
.lesson-list button:hover{border-color:var(--brand)}
.dots{display:inline-flex;gap:3px;font-size:13px;white-space:nowrap}
.modal{position:fixed;inset:0;background:rgba(40,20,5,.45);display:none;align-items:center;justify-content:center;z-index:50;padding:16px}
.modal.open{display:flex}
.modal>.card{width:100%;max-width:560px;max-height:88vh;overflow:auto}
.avatars{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.avatars button{width:48px;height:48px;border-radius:14px;border:3px solid var(--line);background:#fff;font-size:26px}
.avatars button.on{border-color:var(--brand);background:var(--brand-soft)}
/* practice */
.pwrap{max-width:900px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.levels{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.lvcard{border:2px solid var(--line);border-radius:14px;background:#fff;padding:10px;text-align:center;font-weight:800;font-size:13px}
.lvcard .ic{font-size:20px}
.lvcard small{display:block;font-weight:700;color:var(--muted);font-size:11px;margin-top:2px}
.lvcard.on{border-color:var(--green);background:var(--green-soft)}
.lvcard.pass small{color:var(--green)}
.qcard{padding:22px}
.qtags{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.bubble{display:flex;gap:14px;align-items:center;background:var(--brand-soft);border-radius:16px;padding:14px 16px;margin-bottom:16px}
.bubble .who{text-align:center;font-size:40px;line-height:1}
.bubble .who small{display:block;font-size:11px;font-weight:800;color:var(--brand)}
.qtext{font-size:21px;font-weight:800;line-height:1.5}
.qvisual{text-align:center;margin:6px auto 16px;font-size:26px;line-height:1.6;background:#fffcf8;border-radius:14px;padding:14px;border:1px dashed var(--line)}
.big-expr{font-size:30px;font-weight:900;letter-spacing:.5px;white-space:nowrap}
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;line-height:1.05;margin:0 3px;font-weight:900}
.frac>span:first-child{border-bottom:2px solid currentColor;padding:0 4px}
.frac>span{padding:0 4px}
.emoji-grid{font-size:30px;letter-spacing:4px;line-height:1.5;word-break:break-all}
.shape-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.choices{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.choices button{display:flex;align-items:center;gap:12px;padding:14px;border-radius:16px;border:3px solid var(--line);background:#fff;font-size:18px;font-weight:800;color:var(--ink);text-align:left}
.choices button .L{width:34px;height:34px;border-radius:10px;background:var(--line);display:grid;place-items:center;font-weight:900;flex-shrink:0}
.choices button:hover{border-color:var(--brand-2)}
.choices button.sel{border-color:var(--brand);background:var(--brand-soft)}
.choices button.sel .L{background:var(--brand);color:#fff}
.choices button.ok{background:var(--green-soft);border-color:var(--green);color:#126b40}
.choices button.bad{background:var(--red-soft);border-color:var(--red);color:var(--red)}
.choices button.gone{opacity:.25;pointer-events:none}
.ans{display:flex;gap:10px;justify-content:center}
.ans input{width:180px;padding:14px;font-size:26px;font-weight:900;text-align:center;border-radius:16px;border:3px solid var(--line)}
.ans input:focus{outline:none;border-color:var(--brand)}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px;align-items:center}
.actions .sp{flex:1}
.fb{margin-top:16px;padding:14px;border-radius:14px;font-weight:700;display:none}
.fb.ok{display:block;background:var(--green-soft);color:#126b40}
.fb.bad{display:block;background:var(--red-soft);color:#9b2226}
.fb.hint{display:block;background:#fff7d6;color:#7a5b00}
.pause{position:fixed;inset:0;background:rgba(255,248,241,.96);z-index:45;display:grid;place-items:center;text-align:center}
.result{text-align:center;padding:36px 20px}
.big{font-size:64px;font-weight:900;color:var(--brand);line-height:1}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.stat{background:#fff;border-radius:16px;padding:16px;box-shadow:var(--shadow)}
.stat b{display:block;font-size:26px;font-weight:900;color:var(--brand)}
.stat span{font-size:13px;color:var(--muted);font-weight:700}
.books{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.book{border:1px dashed var(--brand-2);border-radius:16px;padding:14px;background:#fffaf3}
.book .cover{height:100px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;font-size:40px;margin-bottom:10px}
.timer{font-size:40px;font-weight:900;color:var(--brand)}
.confetti{position:fixed;top:-20px;font-size:22px;z-index:60;pointer-events:none;animation:fall 2.2s linear forwards}
@keyframes fall{to{transform:translateY(105vh) rotate(540deg);opacity:.6}}
/* tables & lists */
table.log{width:100%;border-collapse:collapse;font-size:14px}
table.log th,table.log td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line)}
table.log th{font-size:12px;color:var(--muted);text-transform:uppercase}
.tblwrap{overflow-x:auto}
.check-list{max-height:340px;overflow:auto;border:1px solid var(--line);border-radius:14px;padding:6px}
.check-item{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;cursor:pointer;font-size:14px}
.check-item:hover{background:#fffaf5}
.check-item input{width:18px;height:18px;accent-color:var(--green)}
.qgrid{display:flex;flex-wrap:wrap;gap:6px}
.qgrid button{width:36px;height:36px;border-radius:10px;border:2px solid var(--line);background:#fff;font-weight:800}
.qgrid button.done{background:var(--green-soft);border-color:var(--green)}
.qgrid button.cur{border-color:var(--brand)}
.gift{display:flex;align-items:center;gap:12px;padding:12px;border-radius:14px;border:1px solid var(--line);margin-bottom:8px}
.gift .ic{font-size:30px}
.badge-tile{text-align:center;padding:14px;border-radius:16px;background:#f6f1ec;opacity:.55}
.badge-tile.got{background:#fff4d6;opacity:1}
.badge-tile .ic{font-size:40px}
.mile{display:flex;gap:10px;align-items:center;padding:8px 0;border-bottom:1px dashed var(--line);font-weight:700;font-size:14px}
.mobile-nav{display:none}
@media (max-width:900px){
  .hero{grid-template-columns:1fr}
  nav.side{display:none}
  .mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:1px solid var(--line);z-index:30}
  .mobile-nav button{flex:1;border:0;background:none;padding:8px 2px;font-size:11px;font-weight:800;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:2px}
  .mobile-nav button span{font-size:20px}
  .mobile-nav button.on{color:var(--brand)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .books{grid-template-columns:1fr}
  .logo small,.hide-sm{display:none}
  .levels{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:560px){
  main{padding:16px 16px 90px}
  .top{padding:10px 12px;gap:6px}
  .logo div:last-child{display:none}
  h1{font-size:22px}
  .stages{grid-template-columns:1fr}
  .stop,.stop:nth-child(even){flex-direction:row}
  .stop .node{width:56px;height:56px;font-size:26px}
  .qtext{font-size:18px}
  .big-expr{font-size:24px}
  .choices{grid-template-columns:1fr}
  .chest{grid-template-columns:1fr}
  .dropdown{left:8px;right:8px;width:auto}
  .g2{grid-template-columns:1fr}
}