:root{font-family:Inter,"Microsoft YaHei","PingFang SC",sans-serif;color:#182747;background:#f3f6fc;font-synthesis:none;--blue:#204ed8}*{box-sizing:border-box}body{margin:0}button,select,input{font:inherit}button,select{cursor:pointer}button{min-height:46px;border:0;border-radius:10px;padding:10px 18px;font-weight:600;touch-action:manipulation}button:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #e6a82a;outline-offset:3px}button:disabled{opacity:.45;cursor:default}header{height:96px;max-width:1180px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:0 34px;border-bottom:1px solid #dae1ef}.brand{display:flex;gap:12px;align-items:center}.mark{display:grid;place-items:center;width:43px;height:43px;background:var(--blue);border-radius:12px;color:white;font-weight:800;font-size:20px}.brand b{font-size:20px}.brand small{display:block;font-size:12px;margin-top:5px;color:#68758e}.edition{font-size:14px;color:#526280}main{display:grid;grid-template-columns:300px minmax(0,1fr);gap:60px;max-width:1180px;padding:54px 34px 80px;margin:auto}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--blue);font-weight:700}h1{font-size:40px;line-height:1.5;letter-spacing:-1px;margin:23px 0 16px}.intro{line-height:1.9;color:#697791;font-size:16px}.stats{display:flex;gap:42px;padding:28px 0 12px;margin-top:25px;border-top:1px solid #dbe2ef}.stats strong{font-size:32px;display:block;font-variant-numeric:tabular-nums}.stats span{font-size:14px;color:#68758e;display:block;margin-top:8px}.local-note,.source{font-size:12px;color:#6a7790;line-height:1.9}.source{margin-top:62px;padding-left:14px;border-left:3px solid #ccd7f5}.source p{margin:6px 0}.source b{font-size:14px;color:#435472}.topline{display:flex;justify-content:space-between;align-items:center}.topline h2{margin:0;font-size:24px}.topline span{font-size:14px;color:#68758e}.filters{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:24px 0 20px}.filters label{display:flex;align-items:center;gap:10px;font-size:14px;color:#62708b}select{min-width:0;width:100%;border:1px solid #d9e1ee;border-radius:9px;padding:12px;background:white;color:#253956}.progress-meta{display:flex;align-items:center;justify-content:space-between;font-size:14px;color:#61708c}.text-button{color:var(--blue);background:none;min-height:40px;padding:5px;font-size:14px;font-weight:500}progress{display:block;width:100%;height:5px;border:0;border-radius:4px;margin:4px 0 23px;background:#dfe6f3}progress::-webkit-progress-bar{background:#dfe6f3;border-radius:4px}progress::-webkit-progress-value{background:var(--blue);border-radius:4px}#question-card{background:white;border:1px solid #e1e7f1;box-shadow:0 8px 35px #203e7610;border-radius:18px;padding:30px}.question-meta{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:#71809a}#badge{background:#ecf1ff;color:var(--blue);padding:6px 10px;border-radius:6px;font-size:14px;font-weight:600}h3{font-size:21px;font-weight:600;line-height:1.85;margin:23px 0 10px;overflow-wrap:anywhere}.hint{font-size:14px;color:#738098;margin:0 0 23px}#options{display:grid;gap:12px}.option{display:flex;align-items:center;text-align:left;gap:14px;line-height:1.7;font-size:16px;font-weight:400;padding:15px 18px;border:1px solid #dce3ee;background:#fff;color:#263852;width:100%}.option .key{display:grid;place-items:center;flex:0 0 30px;height:30px;border:1px solid #dce3ee;border-radius:8px;font-size:14px;font-weight:700}.option.selected{background:#eff4ff;border-color:var(--blue);color:#163da9}.option.selected .key{background:var(--blue);border-color:var(--blue);color:white}.option.correct{background:#edf9f3;border-color:#249366;color:#176846}.option.wrong{background:#fff0f0;border-color:#d55656;color:#a83030}.option:disabled{opacity:1}.actions{display:flex;gap:12px;margin-top:28px}.primary{background:var(--blue);color:white;flex:1}.secondary{background:#f0f3f9;color:#415474}.save-note{text-align:center;color:#78869f;font-size:12px;line-height:1.8;margin:18px 0}#feedback{background:#f2f6ff;border-radius:12px;padding:20px;margin-top:23px;font-size:16px;line-height:1.9}#feedback h4{font-size:17px;margin:0 0 8px}#feedback p{margin:8px 0;overflow-wrap:anywhere}#feedback .ref{font-size:14px;color:#667691}dialog{border:1px solid #dbe3f0;border-radius:18px;max-width:calc(100vw - 32px);width:400px;padding:28px}dialog::backdrop{background:#10254e70}dialog h2{margin-top:0}dialog label{display:block;font-size:14px}input{width:100%;padding:12px;border:1px solid #bccae1;border-radius:8px;margin-top:12px}#jump-error{color:#b23838;font-size:14px}@media(max-width:850px){main{grid-template-columns:1fr;max-width:700px;gap:24px;padding-top:24px}aside{display:none}header{height:80px}.workspace{min-width:0}}@media(max-width:480px){header{padding:0 20px}.brand b{font-size:18px}.edition{font-size:12px}main{padding:24px 16px max(24px,env(safe-area-inset-bottom))}.filters{gap:10px}.filters label{display:block}.filters select{margin-top:7px;padding:11px 8px}.topline h2{font-size:22px}#question-card{padding:21px 18px;border-radius:15px}h3{font-size:19px;margin-top:20px}.option{padding:13px 12px;gap:10px}.actions{gap:8px}.actions button{padding:12px 10px;font-size:14px}.question-meta{gap:8px}#feedback{padding:15px}}@media(prefers-reduced-motion:no-preference){.option{transition:background .15s,border-color .15s}}