:root{--n:#102839;--o:#ed7828;--b:#28637a;--l:#dbe4e8;--g:#f2f6f7;--m:#697c87}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:var(--g);color:#142735;font-family:"Microsoft YaHei","PingFang SC",sans-serif}header{height:82px;background:var(--n);display:flex;align-items:center;justify-content:space-between;padding:10px 32px}.brand{display:flex;align-items:center;gap:14px;color:#fff;text-decoration:none}.brand img{width:210px;height:58px;object-fit:contain}.brand span{border-left:1px solid #ffffff40;padding-left:14px}.brand b,.brand small{display:block}.brand small{color:#bfd0d8;font-size:11px;margin-top:4px}nav{display:flex;gap:20px}nav a,nav button{color:#fff;background:none;border:0;text-decoration:none;font:inherit}main{max-width:1250px;margin:auto;padding:28px}.login{min-height:70vh;display:grid;place-items:center}.login .card{width:min(430px,100%)}.card,.summary article{background:#fff;border:1px solid var(--l);border-radius:14px;padding:24px}.card label{display:grid;gap:7px;margin:14px 0}.card input{padding:11px;border:1px solid #ccd9df;border-radius:8px;font:inherit}button{border:0;border-radius:7px;padding:10px 17px;font:inherit;font-weight:700;cursor:pointer}.primary{background:var(--o);color:#fff}.eye{font-size:12px;font-weight:800;letter-spacing:1.5px;color:var(--b)}.message{min-height:20px;color:#b33}.hero{background:linear-gradient(120deg,#d9eaed,#fff);padding:32px 38px;display:flex;align-items:center;justify-content:space-between}.hero h1{font:40px "STSong","SimSun",serif;margin:8px 0}.hero p{color:#546b78}.summary{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0}.summary span{color:var(--m)}.summary strong{font-size:30px;display:block;margin-top:8px}.section-head,.task-head{display:flex;align-items:center;justify-content:space-between;gap:18px}.list{display:grid;gap:12px}.task{border:1px solid var(--l);border-radius:12px;padding:18px}.task h3{margin:0}.meta{display:flex;flex-wrap:wrap;gap:9px;color:var(--m);font-size:13px;margin:8px 0}.tag{padding:4px 9px;background:#e9f1f3;border-radius:999px}.passed{background:#e2f3e7;color:#16713a}.failed{background:#fae7e3;color:#a83b29}.progress{height:9px;background:#e4eaed;border-radius:9px;overflow:hidden}.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--b),#55a7a8)}.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:13px}.actions button{background:#e5eef1;color:var(--n)}.actions .primary{background:var(--o);color:#fff}.exam{margin-top:10px}.question{border-top:1px solid var(--l);padding:20px 0}.question h3{font-size:17px}.answers{display:grid;gap:8px}.answer{display:flex!important;grid-template-columns:auto 1fr!important;align-items:center!important;gap:9px!important;margin:0!important;border:1px solid var(--l);border-radius:8px;padding:10px}.answer input{width:auto}.toast{position:fixed;right:25px;bottom:25px;background:var(--n);color:#fff;padding:13px 18px;border-radius:8px}@media(max-width:700px){header{padding:8px 12px}.brand img{width:150px}.brand span{display:none}main{padding:12px}.summary{grid-template-columns:repeat(2,1fr)}.hero h1{font-size:30px}.section-head{align-items:start;flex-direction:column}}
.login-actions{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-top:18px}.link-button{background:transparent;color:var(--b);padding-left:0}.code-row{display:grid;grid-template-columns:1fr auto;gap:8px}.code-row button{background:#e5eef1;color:var(--n);white-space:nowrap}.card small{color:var(--m)}.password-input{display:flex;align-items:stretch;width:100%}.card .password-input input{min-width:0;flex:1;border-radius:8px 0 0 8px}.password-toggle{flex:0 0 auto;border:1px solid #ccd9df;border-left:0;border-radius:0 8px 8px 0;background:#f5f8f9;color:var(--b);padding:0 12px;white-space:nowrap}.password-toggle:hover,.password-toggle:focus-visible{background:#e5eef1;outline:2px solid var(--b);outline-offset:-2px}@media(max-width:420px){.password-toggle{padding:0 9px;font-size:13px}}

/* Daily practice: use compact, selectable answer cards instead of default fieldset controls. */
.daily-practice-card{margin:18px 0 20px;padding:26px 30px;background:linear-gradient(145deg,#fff,#fbfdfe)}
.daily-practice-card .section-head{padding-bottom:18px;border-bottom:1px solid #e2eaed}
.daily-practice-card .section-head h2{margin:4px 0 0;font-size:28px}
.daily-practice-card [data-daily-date]{color:var(--b);font-weight:800;background:#eaf3f5;border-radius:999px;padding:8px 12px}
.daily-practice-card [data-daily-body]>p:first-child{margin:20px 0 16px;line-height:1.75;color:#42606e;background:#f4f8f9;border-left:4px solid var(--o);border-radius:0 9px 9px 0;padding:11px 14px}
.daily-practice-card [data-daily-form]>.list{gap:16px}
.daily-practice-card fieldset.item{min-width:0;margin:0;padding:0;border:1px solid #d9e4e8;border-radius:14px;background:#fff;overflow:hidden;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;padding:18px;box-shadow:0 4px 15px rgba(16,40,57,.035)}
.daily-practice-card fieldset.item legend{float:none;display:block;width:100%;max-width:none;grid-column:1/-1;margin:0 0 4px;padding:0;color:#102839;font-size:17px;font-weight:800;line-height:1.65}
.daily-practice-card fieldset.item legend .tag{display:inline-block;margin:0 8px 0 3px;background:#e7f1f4;color:#28637a;font-size:12px;font-weight:800;vertical-align:2px}
.daily-practice-card fieldset.item>label{display:flex!important;align-items:center!important;gap:10px!important;min-width:0;margin:0!important;padding:12px 14px!important;border:1px solid #d9e4e8!important;border-radius:10px!important;background:#fbfdfe!important;color:#173443!important;line-height:1.45!important;cursor:pointer;transition:border-color .15s,background .15s,box-shadow .15s}
.daily-practice-card fieldset.item>label:hover{border-color:#77a8b8!important;background:#f1f8fa!important;box-shadow:0 2px 8px rgba(40,99,122,.08)}
.daily-practice-card fieldset.item>label:has(input:checked){border-color:#e78034!important;background:#fff5eb!important;color:#8c4210!important}
.daily-practice-card fieldset.item>label:has(input:disabled){cursor:default;opacity:.78}
.daily-practice-card fieldset.item>label input{width:18px!important;height:18px!important;min-width:18px!important;margin:0!important;accent-color:#e98034;position:static!important;transform:none!important}
.daily-practice-card fieldset.item>button.secondary{grid-column:1/-1;justify-self:start;margin:4px 0 0;padding:10px 15px;background:#e8f0f3;color:#204f63;border:1px solid #ccdfe5;border-radius:8px}
.daily-practice-card fieldset.item>button.secondary:hover:not(:disabled){background:#d9e9ee}
.daily-practice-card fieldset.item>button.secondary:disabled{background:#f1f4f5;color:#6c7e86;cursor:default}
.daily-practice-card fieldset.item .message{grid-column:1/-1;min-height:0;margin:2px 0 0;padding:10px 12px;border-radius:8px;background:#fff6ed;color:#9b461a;line-height:1.6}
.daily-practice-card fieldset.item .message:empty{display:none}
.daily-practice-card [data-daily-submit]{margin-top:18px;box-shadow:0 7px 14px rgba(237,120,40,.19)}
.daily-practice-card [data-daily-submit]:disabled{background:#c9d3d7;color:#71818a;box-shadow:none;cursor:not-allowed}
.daily-practice-card .summary{margin:18px 0;grid-template-columns:repeat(3,1fr)}
.daily-practice-card .list>.item{border:1px solid #dce6e9;border-radius:12px;padding:17px 18px;background:#fff}
@media(max-width:700px){.daily-practice-card{padding:20px 16px}.daily-practice-card .section-head h2{font-size:24px}.daily-practice-card .section-head{align-items:flex-start}.daily-practice-card [data-daily-date]{font-size:13px}.daily-practice-card fieldset.item{grid-template-columns:1fr;padding:14px;gap:9px}.daily-practice-card fieldset.item legend{font-size:16px}.daily-practice-card .summary{grid-template-columns:1fr;gap:10px}}
.learning-history-panel{margin-top:18px}
.learning-history-panel[hidden]{display:none}
.learning-history-panel .history-actions{display:flex;gap:8px;align-items:center}
.history-item{border:1px solid #d9e4e8;border-radius:12px;padding:16px;margin:12px 0;background:#fff}
.history-item>header{display:flex;justify-content:space-between;gap:12px;align-items:center}
.history-item h3{margin:0;color:var(--n)}
.history-question{padding:10px 0;border-top:1px solid #edf2f4}
.history-question:first-child{border-top:0}
.history-question small{display:block;color:var(--m);margin-top:6px;line-height:1.6}
.daily-practice-card fieldset.item>label{display:grid!important;grid-template-columns:22px minmax(0,1fr)!important;justify-content:start!important}.daily-practice-card fieldset.item>label input{grid-column:1!important;align-self:center!important;justify-self:center!important}
.history-error{color:#a83d32;display:flex;gap:12px;align-items:center}
[data-history-show],[data-daily-history],[data-daily-review]{margin-left:auto}
@media(max-width:680px){.learning-history-panel .section-head{align-items:flex-start}.learning-history-panel .history-actions{width:100%;flex-wrap:wrap}.history-item>header{align-items:flex-start;flex-direction:column}}