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820px){.textbox{max-height:38vh}.scroll{max-height:35vh}}.textbox .newline-badge{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;margin:0 4px 0 6px;border-radius:6px;font-family:var(--font-d);font-size:15px;font-weight:800;line-height:1;vertical-align:middle;transition:all .2s ease;-webkit-user-select:none;user-select:none;white-space:nowrap}.textbox .newline-badge.rest{background:color-mix(in srgb,var(--fg-3) 12%,transparent);color:var(--fg-3);border:1.5px dashed color-mix(in srgb,var(--fg-3) 40%,transparent);opacity:.6}.textbox .newline-badge.cur{background:var(--accent);color:#78350f;border:2px solid var(--accent-dark);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 30%,transparent),0 2px 6px color-mix(in srgb,var(--accent) 40%,transparent);animation:newlineBadgePulse 1s ease-in-out infinite}@keyframes newlineBadgePulse{0%,to{transform:scale(1);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 30%,transparent),0 2px 6px color-mix(in srgb,var(--accent) 40%,transparent)}50%{transform:scale(1.15);box-shadow:0 0 0 6px color-mix(in srgb,var(--accent) 20%,transparent),0 3px 10px color-mix(in srgb,var(--accent) 50%,transparent)}}.textbox .newline-badge.ok{background:var(--mint);color:#fff;border:2px solid #047857;box-shadow:0 1px 4px color-mix(in srgb,var(--mint) 40%,transparent);opacity:.85}.textbox .newline-badge.bad{background:var(--rose);color:#fff;border:2px solid #B91C1C;box-shadow:0 1px 4px color-mix(in srgb,var(--rose) 40%,transparent)}.typein.typearea{width:100%;min-height:60px;max-height:200px;padding:14px 18px;border:3px solid var(--line);border-radius:var(--r);background:var(--bg-2);font-size:22px;font-family:var(--font-b);font-weight:500;line-height:1.5;outline:none;resize:none;overflow-y:auto;transition:all .15s;white-space:pre-wrap;word-break:break-word;scrollbar-width:thin}.typein.typearea:focus{border-color:var(--sky);box-shadow:0 0 0 3px color-mix(in srgb,var(--sky) 20%,transparent)}.typein.typearea.wrong{border-color:var(--coral);background:color-mix(in srgb,var(--coral) 10%,var(--bg-2))}@media (max-width: 820px){.typein.typearea{font-size:18px;min-height:50px;max-height:140px}}.lesson-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.lesson-card{text-align:left;padding:18px;background:#fff;border:2px solid var(--line);border-radius:16px;cursor:pointer;transition:all .2s;box-shadow:0 2px 0 var(--line);font-family:inherit;color:inherit}.lesson-card:hover{transform:translateY(-3px);border-color:var(--brand);box-shadow:0 6px 0 var(--brand-dark)}.lesson-card.done{border-color:var(--mint)}.lesson-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.lesson-card-chapter{font-family:var(--font-d);font-size:12px;font-weight:700;padding:3px 10px;border-radius:999px;background:var(--panel-2);color:var(--fg-2)}.lesson-card h3{font-family:var(--font-d);font-size:17px;font-weight:700;margin:0 0 4px;color:var(--fg)}.lesson-card p{font-size:13px;margin:0 0 12px;line-height:1.5}.lesson-card-progress{display:flex;flex-direction:column;gap:4px;margin-bottom:8px}.lesson-card-meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--fg-3);margin-top:8px}.lesson-detail-header{margin:16px 0 24px}.lesson-detail-header h1{font-family:var(--font-d);font-size:28px;font-weight:800;margin:8px 0;color:var(--fg)}.lesson-detail-header p{font-size:15px;margin:0 0 12px}.lesson-detail-meta{display:flex;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--fg-2)}.lesson-detail-meta span{display:inline-flex;align-items:center;gap:4px}.lesson-tabs{display:flex;gap:8px;margin-bottom:20px;border-bottom:2px solid var(--line);padding-bottom:2px}.lesson-tab{padding:10px 18px;background:transparent;border:none;border-bottom:3px solid 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var(--plum)}.lesson-example-problem p{margin:.3em 0;font-weight:500}.lesson-example-solution{padding:14px 16px;background:var(--panel-2);border-radius:12px}.lesson-example-solution p{margin:.4em 0;line-height:1.65}.example-step{margin:12px 0;padding-left:12px;border-left:2px solid var(--line-2)}.example-step-label{display:inline-block;font-family:var(--font-d);font-weight:800;font-size:15px;color:var(--plum);margin-right:6px}.lesson-example-conclusion{margin-top:16px;padding-top:12px;border-top:2px dashed var(--line)}.lesson-example-conclusion p{margin:.4em 0}.lesson-practice{border-left:4px solid var(--mint)}.practice-list{display:flex;flex-direction:column;gap:16px}.practice-card{background:#fff;border:2px solid var(--line);border-radius:14px;padding:16px 18px;transition:all .2s}.practice-card.correct{border-color:var(--mint);background:color-mix(in srgb,var(--mint) 5%,#FFF)}.practice-card.wrong{border-color:var(--coral);background:color-mix(in srgb,var(--coral) 5%,#FFF)}.practice-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.practice-card-number{font-family:var(--font-d);font-size:13px;font-weight:800;color:var(--mint);padding:3px 10px;border-radius:999px;background:color-mix(in srgb,var(--mint) 15%,#FFF)}.practice-card-badge{font-family:var(--font-d);font-size:13px;font-weight:800;padding:3px 10px;border-radius:999px}.practice-card-badge.correct{background:var(--mint);color:#fff}.practice-card-badge.wrong{background:var(--coral);color:#fff}.practice-question p{margin:.4em 0;line-height:1.6;font-weight:500}.practice-answer-row{display:flex;gap:8px;margin:12px 0}.practice-answer-row .typein{flex:1;padding:12px 16px;font-size:18px;font-family:var(--font-d);font-weight:700;text-align:center;letter-spacing:.05em}.practice-feedback{font-family:var(--font-d);font-weight:700;font-size:14px;margin:8px 0}.practice-feedback.correct{color:var(--mint)}.practice-feedback.wrong{color:var(--coral)}.practice-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.practice-hint,.practice-solution{margin-top:12px;padding:12px 16px;border-radius:10px;font-size:14.5px}.practice-hint{background:color-mix(in srgb,var(--accent) 10%,#FFF);border-left:3px solid var(--accent)}.practice-solution{background:color-mix(in srgb,var(--sky) 10%,#FFF);border-left:3px solid var(--sky)}.practice-hint p,.practice-solution p{margin:.4em 0;line-height:1.6}.lesson-note{display:flex;gap:12px;padding:14px 18px;border-radius:12px;border-left:4px solid var(--brand);background:color-mix(in srgb,var(--brand) 8%,#FFF)}.lesson-note-warning{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,#FFF)}.lesson-note-tip{border-color:var(--mint);background:color-mix(in srgb,var(--mint) 10%,#FFF)}.lesson-note-danger{border-color:var(--rose);background:color-mix(in srgb,var(--rose) 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auto}.lesson-image figure{margin:16px 0;text-align:center}.lesson-image figcaption{font-size:13px;color:#64748b;font-style:italic;margin-top:6px}.home-footer{margin-top:48px;padding:28px 20px 20px;border-top:1px solid rgba(0,0,0,.08);text-align:center;color:#64748b;font-size:14px}.home-footer-brand{margin-bottom:14px}.home-footer-logo{font-family:var(--font-d, system-ui);font-size:20px;font-weight:800;color:#1e293b;letter-spacing:-.3px}.home-footer-logo .accent{color:#3b82f6;font-weight:900}.home-footer-info{display:flex;flex-direction:column;gap:8px;align-items:center;margin-bottom:16px}.home-footer-row{display:flex;align-items:center;gap:8px;color:#475569}.home-footer-icon{font-size:16px}.home-footer-link{color:#3b82f6;text-decoration:none;font-weight:600}.home-footer-link:hover{text-decoration:underline}.home-footer-copy{font-size:12px;color:#94a3b8;padding-top:12px;border-top:1px dashed rgba(0,0,0,.06)}@media (max-width: 480px){.home-footer{padding:20px 12px 16px}.home-footer-logo{font-size:17px}.home-footer-info{font-size:13px}}