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6px;font-size:13px;font-weight:700;color:var(--navy)}.ai-box ul{margin:0 0 10px;padding-left:18px}.ai-box li{margin:3px 0}.ai-loading{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted)}.spinner{width:14px;height:14px;border-radius:50%;border:2px solid #dbe2ea;border-top-color:var(--blue);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.practice{min-height:100vh;background:#f6f8fa;display:flex;flex-direction:column}.practice-top{height:60px;flex:0 0 60px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;background:#fff;border-bottom:1px solid var(--line-2)}.practice-body{flex:1 1 auto;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:0;min-height:0}@media (max-width: 900px){.practice-body{grid-template-columns:minmax(0,1fr)}}.practice-passage{padding:28px 32px;overflow-y:auto;border-right:1px solid var(--line-2);background:#fff}.practice-question{padding:28px 32px;overflow-y:auto;background:#fff}.feedback{margin-top:18px;border-radius:10px;padding:14px 16px;font-size:13.5px;line-height:1.6}.feedback.ok{background:#eefaf3;border:1px solid #bfe6d2}.feedback.no{background:#fdf0ef;border:1px solid #f2c9c6}.feedback h5{margin:0 0 8px;font-size:13px;font-weight:700}.progress-line{height:4px;background:#eef1f5}.progress-line i{display:block;height:100%;background:var(--blue);transition:width .2s}.modal-scrim{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a12236b;display:grid;place-items:center;z-index:100;padding:20px}.modal{background:#fff;border-radius:14px;width:520px;max-width:100%;box-shadow:var(--shadow-pop);padding:26px 28px}.modal h3{margin:0 0 8px;font-size:18px;letter-spacing:-.01em}.modal p{margin:0 0 18px;font-size:13.5px;line-height:1.6;color:var(--muted)}.modal .actions{display:flex;justify-content:flex-end;gap:10px}@media (max-width: 980px){.exam{grid-template-rows:64px 6px minmax(0,1fr) 64px}.canvas{padding:8px 16px 0}.panes{grid-template-columns:minmax(0,1fr)}.splitter{display:none}.pane{padding:18px 16px 20px 0}.pane-right{padding:16px 16px 24px 0}.bottombar{padding:0 16px}.navpop{bottom:74px}.qgrid{grid-template-columns:repeat(7,1fr);gap:10px}.hero h1{font-size:30px}.score-card{grid-template-columns:1fr;gap:18px}.score-col+.score-col{border-left:0;border-top:1px solid var(--line-2);padding-left:0;padding-top:18px}.bar-row{grid-template-columns:120px 1fr 46px}.bar-row .cnt{display:none}}@media (max-width: 640px){.topbar{padding:0 12px}.topbar-title{font-size:13px}.timer{font-size:22px}.topbar-right{gap:12px}.tool span{display:none}.topic{font-size:15px}.nav-actions .btn{padding:0 14px;font-size:13px}.wrap{padding:0 16px}.hero{padding:36px 0 44px}}