:root{--ink:#183941;--muted:#61777b;--teal:#087f81;--light:#e4f4ef;--orange:#f28b54;--paper:#f4f8f7;--line:#dce7e5;--red:#ae3e45;--white:#fff;font-family:'Microsoft YaHei UI','PingFang SC',sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--orange);outline-offset:3px}a{color:var(--teal)}button{border:0;border-radius:12px;padding:12px 20px;background:var(--teal);color:white;font-weight:700;transition:transform .15s,background .15s}button:hover:not(:disabled){transform:translateY(-2px)}button.secondary{background:white;color:var(--ink);border:1px solid var(--line)}button.ghost{background:transparent;color:var(--muted);padding:10px}button.danger{background:#fff0ee;color:var(--red)}input,select,textarea{width:100%;border:1px solid #b9ceca;border-radius:10px;background:white;padding:12px;color:var(--ink)}textarea{min-height:100px}label{display:block;font-size:13px;font-weight:700;margin:15px 0 7px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(30px,4vw,50px);line-height:1.25;letter-spacing:-1.5px;margin-bottom:16px}h2{font-size:25px;letter-spacing:-.5px}h3{font-size:18px}p{line-height:1.8}.muted{color:var(--muted)}.small{font-size:12px}.mono{font-family:Consolas,'SFMono-Regular',monospace;font-variant-numeric:tabular-nums}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--teal);font-weight:700;margin-bottom:15px}.brand{display:flex;align-items:center;gap:12px;font-size:19px;font-weight:800;white-space:nowrap}.brand-mark{background:var(--teal);width:36px;height:40px;clip-path:polygon(35% 0,100% 0,63% 43%,95% 43%,15% 100%,34% 57%,0 57%)}.topbar{height:83px;display:flex;align-items:center;justify-content:space-between;padding:0 5vw;border-bottom:1px solid var(--line);background:rgba(255,255,255,.93);gap:16px}.tag{display:inline-block;padding:5px 10px;border-radius:7px;background:var(--light);color:var(--teal);font-size:12px;font-weight:700}.tag.orange{background:#fff0e5;color:#a24c20}.tag.red{background:#fff0ee;color:var(--red)}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.between{justify-content:space-between}.stack{display:grid;gap:18px}.layout{display:grid;grid-template-columns:225px 1fr;min-height:calc(100vh - 83px)}aside{padding:30px 18px;border-right:1px solid var(--line);background:white;display:flex;flex-direction:column;gap:8px}aside button{text-align:left;background:transparent;color:var(--muted);font-weight:600}aside button.active{color:var(--teal);background:var(--light)}.side-bottom{margin-top:auto;padding:30px 12px 10px;font-size:12px;color:var(--muted);line-height:1.8}main{padding:36px clamp(20px,4vw,60px);max-width:1450px;width:100%;margin:auto}.panel{background:white;border:1px solid var(--line);border-radius:18px;padding:24px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:30px;align-items:center;background:#dff0ec;border-radius:22px;padding:34px 38px;overflow:hidden;margin:24px 0}.hero h1{font-size:clamp(28px,3vw,40px);max-width:580px}.hero p{margin-bottom:0;max-width:540px}.battery{width:220px;height:110px;border:5px solid var(--teal);border-radius:20px;position:relative;padding:9px;display:flex;gap:7px;transform:rotate(-10deg);margin:30px auto}.battery:after{content:'';width:10px;height:40px;border-radius:0 7px 7px 0;position:absolute;right:-15px;top:30px;background:var(--teal)}.battery span{flex:1;border-radius:6px;background:var(--teal)}.battery span:last-child{background:var(--orange)}.module{position:relative;overflow:hidden}.module-icon{width:48px;height:48px;border-radius:13px;background:var(--light);display:grid;place-items:center;font-size:24px;margin-bottom:22px}.module h3{margin-bottom:9px}.module p{font-size:13px;min-height:24px}.module .bottom{border-top:1px solid var(--line);margin-top:24px;padding-top:18px;display:flex;justify-content:space-between;align-items:center}.module .bottom button{padding:10px 14px}.module .number{font-size:28px;font-weight:800}.progress{height:8px;border-radius:8px;background:#e6efec;overflow:hidden;margin:14px 0}.progress span{display:block;height:100%;background:var(--teal);transition:width .4s}.notice{border-left:3px solid var(--orange);padding:12px 16px;background:#fff5eb;font-size:13px;line-height:1.7;border-radius:0 9px 9px 0;margin:18px 0}.stats{display:flex;gap:30px;margin:22px 0}.stat strong{display:block;font-size:27px;margin-bottom:6px}.stat span{font-size:12px;color:var(--muted)}.login{max-width:1120px;margin:7vh auto;padding:25px;display:grid;grid-template-columns:1.1fr 1fr;gap:70px;align-items:center}.login .intro{padding:10px}.login h1{font-size:52px}.login .panel{padding:34px}.segmented{display:flex;padding:5px;border-radius:13px;background:#edf4f1;gap:5px}.segmented button{flex:1;background:transparent;color:var(--muted);padding:11px 8px}.segmented button.active{background:white;color:var(--teal);box-shadow:0 2px 7px #163d3210}.wide{width:100%;margin-top:20px}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin-top:26px}.flip-card{min-height:180px;border-radius:18px;background:var(--ink);color:white;position:relative;padding:22px;text-align:left;border:1px solid #254b51;overflow:hidden;display:flex;flex-direction:column;justify-content:space-between}.flip-card:before{content:'';position:absolute;width:130px;height:130px;border:1px solid #ffffff20;border-radius:50%;right:-45px;bottom:-40px}.flip-card .symbol{font-size:35px;color:#81d8c0;align-self:center}.flip-card .card-foot{display:flex;justify-content:space-between;font-size:12px;color:#c5dcd8}.flip-card.done{background:white;color:var(--teal);border:1px solid #a8d2c5}.flip-card.wrong{background:#fff5ee;color:#995231;border-color:#eccab4}.flip-card.done .card-foot{color:var(--muted)}.challenge-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin:26px 0}.meter{display:flex;gap:5px;align-items:center}.meter i{height:24px;width:13px;background:#dbe9e5;border-radius:3px}.meter i.lit{background:var(--teal)}.timer{font-size:25px;font-weight:700}.streak{color:#b75220;font-weight:700}.milestones{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin:18px 0}dialog{border:1px solid var(--line);border-radius:22px;padding:30px;width:min(640px,calc(100% - 24px));max-height:90vh;color:var(--ink);box-shadow:0 30px 100px #12393433}dialog::backdrop{background:#102d36aa;backdrop-filter:blur(4px)}.question-text{font-size:21px;line-height:1.7;margin:22px 0;white-space:pre-wrap}.options{display:grid;gap:11px}.option{display:flex;align-items:center;gap:14px;text-align:left;color:var(--ink);background:white;border:1px solid var(--line);font-weight:400;line-height:1.6;padding:15px}.option b{display:grid;place-items:center;border:1px solid var(--line);border-radius:8px;min-width:32px;height:32px;font-size:13px}.option.chosen{border-color:var(--teal);background:var(--light)}.option.chosen b{background:var(--teal);color:white;border-color:var(--teal)}.feedback{background:var(--light);padding:22px;border-radius:14px;margin:20px 0;line-height:1.8}.feedback.bad{background:#fff0e8}.score-display{font-size:76px;font-weight:800;letter-spacing:-5px;color:var(--teal);line-height:1.2}.score-display small{font-size:17px;letter-spacing:0;color:var(--muted)}.report-hero{display:flex;justify-content:space-between;gap:25px;align-items:center;background:#e0f0ea;border-radius:20px;padding:30px;margin:22px 0}.point{padding:20px 0;border-bottom:1px solid var(--line)}.point:last-child{border:0}.point p{margin:10px 0 0;font-size:14px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:14px;white-space:nowrap}th{font-size:12px;color:var(--muted);font-weight:500;padding:15px;border-bottom:1px solid var(--line)}td{padding:17px 15px;border-bottom:1px solid #edf2f0}tr.mine{background:var(--light)}tr.mine td:first-child{border-left:3px solid var(--teal)}.rank-num{font-size:21px;font-weight:800}.rank-num.top{color:#b87823}.empty{text-align:center;padding:50px 15px;color:var(--muted);line-height:1.9}.tabs{display:flex;gap:9px;flex-wrap:wrap;margin:22px 0}.tabs button{padding:10px 15px;background:white;color:var(--muted);border:1px solid var(--line)}.tabs button.active{background:var(--ink);color:white;border-color:var(--ink)}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.file-box{border:1px dashed #9dbeb6;background:#f5faf8;padding:22px;border-radius:12px;margin:18px 0}.file-box input{margin-top:12px;background:white}.error{color:var(--red);white-space:pre-wrap;font-size:13px;line-height:1.7}.pill{display:inline-block;background:#edf4f1;border-radius:20px;padding:5px 11px;font-size:12px;margin:4px}.history{margin-top:20px}.history summary{cursor:pointer;padding:15px 0;font-weight:700}.review-q{border-top:1px solid var(--line);padding:20px 0;line-height:1.8}.checkline{display:flex;align-items:center;gap:9px;margin:15px 0}.checkline input{width:auto}.toast-show{opacity:1!important;transform:translate(-50%,0)!important}#toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,20px);opacity:0;transition:.2s;background:var(--ink);color:white;padding:14px 24px;border-radius:12px;z-index:20;pointer-events:none;max-width:90%;white-space:pre-line}.spacer{height:10px}.badge-circle{width:80px;height:80px;display:grid;place-items:center;border-radius:50%;background:var(--teal);color:white;font-size:34px}.loading{padding:90px;text-align:center}.footer-note{font-size:12px;color:var(--muted);text-align:center;padding:24px}.back{padding-left:0!important}.admin-count{font-size:32px;font-weight:800}.alert{color:var(--red)}
@media(max-width:1000px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.layout{grid-template-columns:180px 1fr}.cards{grid-template-columns:repeat(3,minmax(0,1fr))}.login{gap:30px}.login h1{font-size:42px}.grid.four{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.topbar{height:70px;padding:0 18px}.topbar .user-id{display:none}.brand{font-size:16px;gap:8px}.brand-mark{width:26px;height:30px}.layout{display:block}aside{position:sticky;top:0;z-index:5;flex-direction:row;padding:9px 12px;border-right:0;border-bottom:1px solid var(--line);overflow:auto}aside button{white-space:nowrap;font-size:13px;padding:10px 14px}aside .side-bottom{display:none}main{padding:24px 18px}.hero{padding:26px;grid-template-columns:1fr}.hero .battery{display:none}.hero h1{font-size:30px}.grid,.grid.two{grid-template-columns:1fr}.grid.four{grid-template-columns:1fr 1fr}.module{padding:22px}.login{display:block;margin:18px auto;padding:22px}.login .intro{padding:8px 0 25px}.login h1{font-size:37px}.login .battery{display:none}.login .panel{padding:24px}.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.flip-card{min-height:160px;padding:18px}.challenge-head{flex-wrap:wrap}.report-hero{padding:24px;align-items:flex-start}.report-hero .badge-circle{display:none}.score-display{font-size:64px}.stats{gap:22px}.field-grid{grid-template-columns:1fr}.panel{padding:20px}dialog{padding:23px}.question-text{font-size:18px}.milestones{font-size:10px}.row.mobile-stack{align-items:stretch;flex-direction:column}.row.mobile-stack>*{width:100%}}
main{margin:0 auto;align-self:start}
@media(max-width:700px){.topbar .row{gap:2px;flex-wrap:nowrap}.topbar .row>span{max-width:60px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topbar button.ghost{padding:8px 5px;font-size:12px}.topbar .brand{gap:6px}.topbar .tag{font-size:10px;padding:4px 6px}aside{scrollbar-width:none}aside::-webkit-scrollbar{display:none}}
@keyframes reveal-card{from{opacity:0;transform:perspective(1000px) rotateY(-16deg) translateY(15px)}to{opacity:1;transform:none}}dialog[open]{animation:reveal-card .25s ease-out}.flip-card:active{transform:perspective(700px) rotateY(9deg)}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}