:root{--ink:#111827;--muted:#4b5563;--line:#cbd5e1;--soft:#f3f6fa;--blue:#183153;--blue2:#24558a;--ok:#166534;--bad:#991b1b;--paper:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#eef2f6;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",Arial,sans-serif;line-height:1.65}.topbar{position:sticky;top:0;z-index:30;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:14px 22px;background:#fff;border-bottom:2px solid var(--blue)}.topbar h1{font-size:24px;margin:0;color:#0f2742}.topbar p{margin:2px 0 0;color:var(--muted)}.top-actions{display:flex;flex-wrap:wrap;gap:8px}.btn{display:inline-flex;justify-content:center;align-items:center;min-height:40px;padding:8px 13px;border:1px solid #94a3b8;border-radius:6px;background:#fff;color:#111827;font-weight:700;text-decoration:none;cursor:pointer}.btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}.btn.danger{color:#991b1b;border-color:#f0a7a7}.btn.full{width:100%;margin-top:10px}.file-btn{cursor:pointer}.course-note{padding:10px 22px;background:#fff7d6;border-bottom:1px solid #d6c477;color:#332b0c}.layout{display:grid;grid-template-columns:285px minmax(0,1fr);max-width:1500px;margin:auto;min-height:calc(100vh - 116px)}.sidebar{position:sticky;top:84px;height:calc(100vh - 84px);overflow:auto;padding:18px;background:#fff;border-right:1px solid var(--line)}.progress-card{border:1px solid var(--line);padding:13px;margin-bottom:14px}.progress-card b{font-size:30px;color:var(--blue)}.progress{height:9px;background:#e5e7eb;margin-top:8px}.progress span{display:block;height:100%;width:0;background:var(--ok)}.progress-card p{margin:6px 0 0;color:var(--muted)}.search-label{display:block;font-weight:800;margin-bottom:5px}.input{width:100%;min-height:42px;padding:9px 10px;border:1px solid #94a3b8;border-radius:5px;background:#fff;color:#111827;font-size:15px}.day-list{display:grid;gap:5px;margin:14px 0}.day-btn{display:grid;grid-template-columns:42px 1fr auto;align-items:center;gap:7px;width:100%;padding:9px;border:1px solid #d5dce5;background:#fff;color:#111827;text-align:left;cursor:pointer}.day-btn.active{border:2px solid var(--blue);background:#edf4fb}.day-btn.done .day-number{background:var(--ok)}.day-number{display:grid;place-items:center;width:34px;height:34px;background:#5b6b7c;color:#fff;font-weight:900}.day-title{font-weight:700;line-height:1.25}.day-check{color:var(--ok);font-weight:900}.vocab-link{color:var(--blue)}.content{min-width:0;padding:22px}.day-overview,.lesson-content,.practice-section,.day-finish{max-width:1000px;margin:0 auto 16px;background:var(--paper);border:1px solid var(--line);padding:20px}.day-overview h2{margin:0;color:#0f2742}.day-meta{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}.badge{border:1px solid #9fb1c4;background:#edf4fb;padding:3px 8px;font-weight:700}.time-plan{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);margin-top:12px}.time-plan div{padding:8px;border-right:1px solid var(--line);text-align:center}.time-plan div:last-child{border:0}.topic-tabs{display:flex;flex-wrap:wrap;gap:7px;max-width:1000px;margin:0 auto 12px}.topic-tab{padding:9px 12px;border:1px solid #8595a7;background:#fff;color:#111827;font-weight:700;cursor:pointer}.topic-tab.active{background:var(--blue);color:#fff}.lesson-head{border-bottom:2px solid var(--blue);padding-bottom:10px}.lesson-head h2{margin:0}.goal{color:var(--muted);margin:5px 0}.rule{background:#f1f5f9;border-left:5px solid var(--blue);padding:13px;margin:14px 0;font-size:16px}.subsection{margin:20px 0}.subsection h3,.practice-section h2{color:#0f2742}.bullets{padding-left:22px}.table-wrap{overflow:auto;margin:15px 0}table{width:100%;border-collapse:collapse;min-width:520px}th,td{border:1px solid #9aa8b8;padding:8px;text-align:left;vertical-align:top}th{background:#e7edf4}.patterns{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:8px}.pattern{border:1px solid #9fb1c4;padding:9px;background:#fafcff;font-family:ui-monospace,Consolas,monospace}.example{padding:10px 0;border-bottom:1px solid #d9e0e8}.example-en{font-size:17px;font-weight:650}.example-zh{color:#374151}.token{border:0;background:transparent;color:#164e85;padding:0 1px;font:inherit;font-weight:inherit;cursor:pointer;border-bottom:1px dotted #164e85}.speak{border:1px solid #9aa8b8;background:#fff;margin-left:8px;cursor:pointer}.mistake{border:1px solid #e4a5a5;padding:10px;margin:8px 0}.wrong{color:var(--bad)}.right{color:var(--ok);font-weight:700}.tip{background:#fff7d6;border:1px solid #d6c477;padding:12px}.practice-head{display:flex;justify-content:space-between;align-items:center;gap:10px}.practice-score{font-weight:900}.exercise{border-top:1px solid var(--line);padding:15px 0}.exercise-type{font-size:13px;font-weight:900;color:#334155}.exercise p{margin:5px 0}.answer-row{display:flex;gap:8px;margin-top:8px}.answer-row input{flex:1}.feedback{margin-top:7px;padding:7px 9px}.feedback.ok{background:#dcfce7;color:#14532d}.feedback.bad{background:#fee2e2;color:#7f1d1d}.answer-box{margin-top:8px;background:#f1f5f9;border-left:4px solid #64748b;padding:9px}.day-finish label{font-weight:700}.day-finish p{color:var(--muted)}.word-popup{position:fixed;z-index:100;width:min(330px,calc(100vw - 24px));background:#fff;border:2px solid var(--blue);padding:13px;box-shadow:0 12px 35px #0003}.word-popup h3{margin:0}.word-popup .ipa{color:#374151}.word-popup button{margin-top:8px}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#111827;color:#fff;padding:10px 15px;transition:.2s;z-index:200}.toast.show{opacity:1;transform:translate(-50%,0)}mark{background:#fff19d}.empty-search{padding:40px;text-align:center;color:var(--muted)}
@media(max-width:820px){.topbar{position:static;display:block;padding:12px 14px}.top-actions{margin-top:10px}.course-note{padding:9px 14px}.layout{display:block}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:12px}.day-list{grid-template-columns:repeat(2,minmax(0,1fr));max-height:330px;overflow:auto}.day-btn{grid-template-columns:34px 1fr}.day-check{display:none}.content{padding:10px}.day-overview,.lesson-content,.practice-section,.day-finish{padding:14px}.time-plan{grid-template-columns:1fr}.time-plan div{border-right:0;border-bottom:1px solid var(--line);text-align:left}.time-plan div:last-child{border-bottom:0}.topic-tabs{position:sticky;top:0;z-index:20;background:#eef2f6;padding:7px 0}.topic-tab{flex:1}.answer-row{display:block}.answer-row .btn{width:100%;margin-top:7px}.speech-settings-trigger{bottom:12px!important}.patterns{grid-template-columns:1fr}}