:root{font-family:system-ui,-apple-system,"Microsoft YaHei",sans-serif;color:#1b253b;background:#f3f6fc;font-size:16px;line-height:1.65;--blue:#1747ce;--line:#dce3f0}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:1px solid var(--line);background:white;border-radius:10px;padding:10px 17px;color:inherit}button:hover{border-color:var(--blue)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #8faafd;outline-offset:3px}button:disabled{opacity:.5;cursor:default}.primary{background:var(--blue);color:white;border-color:var(--blue);font-weight:650}.quiet{background:transparent;border:0;padding:8px}header{max-width:1180px;margin:auto;min-height:100px;padding:20px 36px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{text-decoration:none;color:inherit;display:flex;gap:12px;align-items:center;font-size:21px;font-weight:750}.brand small{display:block;font-size:12px;font-weight:500;letter-spacing:.12em;color:#64728a}.mark{background:var(--blue);color:white;width:46px;height:46px;display:grid;place-items:center;border-radius:14px;font-family:serif;font-size:28px}#account{font-size:14px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}main{max-width:1108px;margin:24px auto 60px;padding:0 24px}.auth{max-width:460px;margin:50px auto;padding:36px;background:white;border:1px solid var(--line);border-radius:18px;box-shadow:0 12px 45px #1b315309}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--blue)}h1{font-size:30px;letter-spacing:-.03em;margin:8px 0 12px}h2{font-size:23px;line-height:1.75;font-weight:650;margin:22px 0 30px;overflow-wrap:anywhere}h3{font-size:17px;margin:12px 0}.muted{color:#69768a;font-size:14px}.auth label{display:block;font-size:14px;margin:18px 0 6px}input,select{width:100%;padding:12px;border:1px solid #ccd5e5;border-radius:8px;background:white;color:inherit}.auth .primary{width:100%;margin-top:24px}.auth .switch{display:block;margin:14px auto 0}.layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:28px}.side{padding:14px 0}.side h1{font-size:25px;margin-bottom:6px}.side label{display:block;margin:28px 0 9px;font-size:14px;font-weight:650}.side select{font-size:14px}.side .note{border-left:3px solid #bed0ff;margin-top:30px;padding-left:14px}.card{background:white;border:1px solid var(--line);border-radius:18px;padding:34px 38px;box-shadow:0 12px 45px #1b315306}.topline{display:flex;justify-content:space-between;gap:12px;align-items:center;font-size:14px;color:#5d6c84}.badge{display:inline-block;background:#edf2ff;color:var(--blue);font-size:13px;padding:3px 10px;border-radius:5px}.progress{width:100%;height:4px;margin:22px 0 28px;accent-color:var(--blue)}.options{display:grid;gap:12px}.option{text-align:left;display:flex;align-items:flex-start;gap:16px;padding:17px 18px;line-height:1.7;min-height:62px;border-radius:10px;width:100%;background:#fff}.letter{display:grid;place-items:center;flex:0 0 30px;height:30px;border:1px solid var(--line);border-radius:7px;font-weight:600}.option.selected{background:#eef3ff;border-color:var(--blue)}.selected .letter{background:var(--blue);color:white;border-color:var(--blue)}.option.correct{border-color:#148458;background:#eef9f3;opacity:1}.option.wrong{border-color:#ca4949;background:#fff2f2;opacity:1}.actions{display:flex;justify-content:space-between;align-items:center;gap:12px;border-top:1px solid var(--line);margin-top:28px;padding-top:24px}.actions .primary{min-width:150px}.source{font-size:12px;color:#7d899c;margin-top:22px;overflow-wrap:anywhere}.result{margin-top:28px;padding:22px;border-radius:12px;background:#f6f8fc;border:1px solid var(--line)}.result.good{border-top:4px solid #148458}.result.bad{border-top:4px solid #ca4949}.result h3{font-size:20px;margin:0 0 16px}.option-note{padding:12px 0;border-top:1px solid var(--line);font-size:15px}.option-note strong{color:var(--blue)}.explanation{white-space:pre-line;font-size:15px;line-height:1.9}.result a{color:var(--blue);overflow-wrap:anywhere;font-size:14px}details{margin-top:14px}summary{cursor:pointer;font-size:14px;color:#526582}.admin-head{display:flex;justify-content:space-between;align-items:center;gap:16px}.person{padding:20px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;align-items:center}.person p{margin:3px 0}.person .buttons{display:flex;gap:8px;flex-wrap:wrap}.empty{text-align:center;padding:45px 15px}footer{text-align:center;font-size:12px;color:#8995a8;padding:20px}#notice:not(:empty){position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#1b253b;color:white;border-radius:10px;padding:12px 20px;max-width:90%;z-index:5}.error{color:#b93636;font-size:14px}.auth-note{font-size:12px;color:#7d899c}.status{padding:4px 10px;border-radius:5px;background:#eff3fa;font-size:13px}
@media(max-width:760px){header{padding:18px 20px;min-height:80px}.brand{font-size:18px}.brand small{font-size:12px}main{margin-top:10px;padding:0 16px}.layout{grid-template-columns:1fr;gap:16px}.side{padding:0}.side h1{font-size:24px}.side label{margin:10px 0 5px}.side .note{display:none}.card{padding:24px 20px;border-radius:14px}h2{font-size:20px;margin:18px 0 24px}.auth{margin:25px auto;padding:26px}.person{align-items:flex-start;flex-direction:column}.option{padding:14px 12px;gap:12px}.actions{flex-wrap:wrap}.result{padding:18px 15px}#account>span{display:none}.progress{margin:18px 0}.source{margin-top:16px}}
.payment-qr{display:block;width:240px;max-width:100%;height:auto;margin:24px auto}.payment-unavailable{background:#eef3ff;padding:16px;border-radius:10px;color:#1747ce}
.payment{max-width:560px}.payment-qr{width:360px}.receipt-check{display:flex;gap:10px;align-items:flex-start;font-size:14px;margin-bottom:16px;max-width:300px}.receipt-check input{width:20px;height:20px;flex-shrink:0}.approval-controls{max-width:360px}.person{flex-wrap:wrap}.payment a{color:var(--blue)}
.module-bar{margin-bottom:24px}.module-nav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}.module{border:0;background:#e7ecf6;font-weight:650;min-width:90px}.module.active{background:#1747ce;color:white}.view-modes{display:flex;gap:10px}.resource-search{display:flex;gap:12px}.resource-search input{min-width:0}.resource-row{padding:20px 0;border-top:1px solid var(--line)}.document-text{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.9}.reader h1{font-size:24px;overflow-wrap:anywhere}.document-link{display:inline-block;color:#1747ce;margin:15px 0}.related{background:#f1f5fc;padding:16px;border-radius:8px}.related button{display:block;text-align:left}.essay textarea{width:100%;font:inherit;padding:16px;border:1px solid #ccd5e5;border-radius:10px;resize:vertical}.essay label{display:block;font-weight:650;margin:20px 0 8px}.essay-material{margin:20px 0;padding:16px;background:#f1f5fc;border-radius:10px}.essay-material .document-text{max-height:65vh;overflow:auto;margin-top:20px}.essay .result{margin-bottom:20px}@media(max-width:760px){.module{min-width:65px;flex:1}.resource-search{flex-wrap:wrap}.resource-search input{flex:1}.reader{padding:20px 16px}}

.practice-setup,.guide{max-width:820px;margin:auto}.practice-setup label{display:block;margin:20px 0 8px}.practice-setup select{width:100%}.guide-link{display:inline-block;margin:10px 12px;font-size:14px}.purchase-terms{background:#fff8e9;border:1px solid #eac989;border-radius:12px;padding:18px;margin:20px 0;line-height:1.8}.purchase-terms h2{margin-top:0}.guide{line-height:1.9}.guide h2{font-size:21px;margin-top:28px}.guide li{margin-bottom:12px}.guide-cta{display:inline-block;padding:12px 20px;border-radius:10px;text-decoration:none}.receipt-check input{flex-shrink:0}[hidden]{display:none!important}