:root{color:#172033;--exam-reading-font:Georgia, Cambria, "Times New Roman", "Microsoft YaHei", sans-serif;background:#f4f7fb;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5}*{box-sizing:border-box}body{margin:0}button,select,textarea{font:inherit}button{color:#172033;cursor:pointer;background:#fff;border:1px solid #ccd6e4;border-radius:12px;padding:.65rem .9rem}button:hover{border-color:#36f}button:disabled{cursor:not-allowed;opacity:.55}main{max-width:1180px;margin:0 auto;padding:24px}.hero{color:#fff;background:linear-gradient(135deg,#12213f,#3457d5);border-radius:28px;justify-content:space-between;align-items:center;gap:24px;margin-bottom:24px;padding:28px;display:flex}.hero h1{margin:.2rem 0}.hero p{opacity:.86;margin:0}.eyebrow{letter-spacing:.12em;text-transform:uppercase;font-size:.8rem}nav,.actions{flex-wrap:wrap;gap:10px;display:flex}.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.span{grid-column:1/-1}.exam-picker{gap:8px;max-width:720px;margin-bottom:18px;display:grid}.exam-picker span{color:#667085;font-size:.9rem}.card,.panel{background:#fffffff2;border:1px solid #e3e8f1;border-radius:24px;padding:22px;box-shadow:0 18px 50px #1f2f5014}.stats{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:18px 0;display:grid}.stats div{background:#f4f7fb;border-radius:18px;padding:16px}.stats span{color:#667085;font-size:.85rem;display:block}.stats strong{margin-top:4px;font-size:1.7rem;display:block}.primary{color:#fff;background:#315efb;border-color:#315efb}.danger{color:#b42318;background:#fff2f2;border-color:#ffc7c7}.workspace{grid-template-columns:310px 1fr;gap:18px;display:grid}.panel{align-self:start;position:sticky;top:16px}.toolbar{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}select{border:1px solid #ccd6e4;border-radius:12px;width:100%;padding:.6rem}.question-nav{grid-template-columns:repeat(5,1fr);gap:8px;display:grid}.question-nav button{padding:.5rem 0}.question-nav .current{border-color:#315efb;box-shadow:inset 0 0 0 2px #315efb}.question-nav .answered{background:#eef4ff}.question-nav .wrong{color:#b42318;background:#fff2f2}.question-meta{color:#667085;justify-content:space-between;gap:12px;display:flex}.passage{background:#f8fafc;border-radius:18px;margin:18px 0;padding:16px}.passage summary{justify-content:space-between;align-items:center;gap:12px;display:flex}.translation-toggle{color:#315efb;background:#fff;border:1px solid #c8d9ff;padding:.4rem .85rem;font-size:.85rem}.translation-toggle.on{color:#fff;background:#315efb}.passage-paragraph{border-top:1px dashed #0f172a14;margin-top:.75rem;padding-top:.75rem}.passage-paragraph:first-of-type{border-top:none;margin-top:.25rem;padding-top:0}.passage-english,.passage-chinese{font-family:var(--exam-reading-font);letter-spacing:.008em;margin:.5rem 0;font-size:1.06rem;line-height:1.85}.passage-chinese{color:#1f2a44;background:#eef4ff;border-left:3px solid #315efb;border-radius:8px;padding:.6rem .85rem}.text-bold{font-weight:700}.text-underline{text-underline-offset:3px;text-decoration:underline;text-decoration-thickness:1.5px}.question-card h2{font-family:var(--exam-reading-font);letter-spacing:.005em;font-size:1.35rem;font-weight:600;line-height:1.65}.learn-action{color:#8a4b08;background:#fff7e8;border-color:#f6b94f}.question-directions{color:#475467;background:#f8fafc;border-left:4px solid #315efb;margin:18px 0;padding:12px 14px}.identification-prompt{font-family:var(--exam-reading-font);margin:12px 0 20px;font-size:1.35rem;font-weight:600;line-height:3}.identification-target{vertical-align:middle;flex-direction:column;align-items:center;margin:0 .18em;line-height:1.15;display:inline-flex}.identification-underline{border-bottom:2px solid}.identification-marker{margin-top:.22em;font-size:.72em}.choices{gap:10px;display:grid}.choices label{cursor:pointer;border:1px solid #d9e2ef;border-radius:16px;gap:10px;padding:14px;display:flex}.choices label.selected{background:#eef4ff;border-color:#315efb}textarea{resize:vertical;border:1px solid #ccd6e4;border-radius:16px;width:100%;min-height:150px;padding:14px}.answer-box,.feedback{border-radius:16px;margin-top:16px;padding:16px}.answer-box{background:#f8fafc}.feedback.ok{color:#067647;background:#ecfdf3}.feedback.bad{color:#b42318;background:#fff2f2}.history{color:#475467;padding-left:1.2rem}.empty{text-align:center}.choices label span{font-family:var(--exam-reading-font);letter-spacing:.004em;font-size:1.03rem;line-height:1.65}.translation textarea,.answer-box p,.explanation-panel blockquote{font-family:var(--exam-reading-font);font-size:1.03rem;line-height:1.75}.learning-home{gap:18px;display:grid}.learning-intro{justify-content:space-between;align-items:center;gap:24px;display:flex}.learning-intro h2{margin:.25rem 0}.blue{color:#315efb}.review-badge{color:#8a4b08;text-align:center;background:#fff7e8;border-radius:18px;min-width:150px;padding:18px}.review-badge strong{font-size:2rem;display:block}.course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.course-card h3{margin:.4rem 0}.course-card p,.course-range{color:#667085}.course-range{font-size:.85rem}.course-progress{background:#e9eef7;border-radius:999px;height:8px;margin:16px 0;overflow:hidden}.course-progress span{background:linear-gradient(90deg,#315efb,#32b67a);height:100%;display:block}.learning-workspace{grid-template-columns:250px 1fr;gap:18px;display:grid}.lesson-sidebar{align-self:start;gap:12px;display:grid;position:sticky;top:16px}.lesson-sidebar p{color:#667085;margin:0}.back-button{justify-self:start}.lesson-dots{grid-template-columns:repeat(5,1fr);gap:6px;max-height:420px;display:grid;overflow:auto}.lesson-dots span{text-align:center;background:#f4f7fb;border-radius:8px;padding:6px 2px;font-size:.8rem}.lesson-dots .current{color:#fff;background:#315efb}.lesson-dots .done{color:#067647;background:#ecfdf3}.teaching-card{min-width:0}.submit-answer{margin-top:16px}.teaching-panel{border-radius:18px;margin-top:18px;padding:18px}.teaching-panel p{margin:.6rem 0}.hint-panel{color:#7a4a08;background:#fff7e8;border:1px solid #fbd38d}.explanation-panel{background:#f0f6ff;border:1px solid #c8d9ff}.explanation-panel blockquote{color:#344054;background:#fff;border-left:4px solid #315efb;margin:12px 0;padding:12px 14px}.takeaway{background:#fff;border-radius:12px;margin-top:12px;padding:12px}.checklist{padding:0;list-style:none}.lesson-next{border-top:1px solid #e3e8f1;justify-content:space-between;align-items:center;margin-top:20px;padding-top:18px;display:flex}.lesson-next span{color:#067647}.lesson-complete{padding:60px 24px}@media (width<=820px){main{padding:14px}.hero,.workspace,.learning-intro,.learning-workspace{display:block}nav{margin-top:18px}.grid,.stats,.course-grid{grid-template-columns:1fr}.panel{margin-bottom:16px;position:static}.review-badge{margin-top:16px}.question-nav{grid-template-columns:repeat(6,1fr)}.passage summary{flex-wrap:wrap}}