:root{--bg: #f5f5f5;--text: #222;--card: #fff;--border: #e0e0e0;--header-bg: #1a1a2e;--header-text: #fff;--muted: #888;--muted2: #666;--muted3: #aaa;--dot: #ddd;--dot-active: #1a1a2e;--dot-done: #66bb6a;--nav-btn-bg: #fff;--nav-btn-border: #ddd;--nav-btn-hover: #f0f0f0;--badge-bg: #f3e5f5;--badge-text: #6a1b9a;--badge-video-bg: #e8f4fd;--badge-video-text: #1565c0;--badge-file-bg: #fef3e2;--badge-file-text: #e65100;--badge-hw-bg: #e8f5e9;--badge-hw-text: #2e7d32;--btn-primary-bg: #1a1a2e;--btn-primary-text: #fff;--btn-secondary-bg: #e8eaf6;--btn-secondary-text: #283593;--btn-orange-bg: #fff3e0;--btn-orange-text: #e65100;--btn-green-bg: #e8f5e9;--btn-green-text: #2e7d32;--answer-bg: #e8f5e9;--answer-border: #43a047;--answer-label: #2e7d32;--answer-value: #1b5e20;--expl-bg: #fff8e1;--expl-border: #ffb300;--expl-label: #e65100;--input-border: #ddd;--input-focus: #1a1a2e;--input-bg: #fff;--correct-bg: #e8f5e9;--correct-text: #2e7d32;--wrong-bg: #fce4ec;--wrong-text: #c62828;--hover-shadow: #0002;--progress-none-bg: #f0f0f0;--progress-none-text: #bbb;--progress-partial-bg: #fff3e0;--progress-partial-text: #e65100;--progress-full-bg: #e8f5e9;--progress-full-text: #2e7d32}[data-theme=dark]{--bg: #181818;--text: #e0e0e0;--card: #242424;--border: #333;--header-bg: #111;--header-text: #eee;--muted: #777;--muted2: #999;--muted3: #666;--dot: #444;--dot-active: #7c8cf5;--dot-done: #4caf50;--nav-btn-bg: #2a2a2a;--nav-btn-border: #444;--nav-btn-hover: #333;--badge-bg: #2d2040;--badge-text: #c4a0f5;--badge-video-bg: #1a2a3a;--badge-video-text: #64b5f6;--badge-file-bg: #2a2010;--badge-file-text: #ffb74d;--badge-hw-bg: #1a2a1a;--badge-hw-text: #81c784;--btn-primary-bg: #4a50a5;--btn-primary-text: #fff;--btn-secondary-bg: #2a2d45;--btn-secondary-text: #9fa8da;--btn-orange-bg: #2a2010;--btn-orange-text: #ffb74d;--btn-green-bg: #1a2a1a;--btn-green-text: #81c784;--answer-bg: #1a2a1a;--answer-border: #388e3c;--answer-label: #81c784;--answer-value: #a5d6a7;--expl-bg: #2a2410;--expl-border: #f9a825;--expl-label: #ffb74d;--input-border: #444;--input-focus: #7c8cf5;--input-bg: #2a2a2a;--correct-bg: #1a2a1a;--correct-text: #81c784;--wrong-bg: #2a1a1a;--wrong-text: #ef9a9a;--hover-shadow: #0005;--progress-none-bg: #2a2a2a;--progress-none-text: #555;--progress-partial-bg: #2a2010;--progress-partial-text: #ffb74d;--progress-full-bg: #1a2a1a;--progress-full-text: #81c784}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;transition:background .2s,color .2s}a{color:inherit;text-decoration:none}header{background:var(--header-bg);color:var(--header-text);padding:12px 20px;display:flex;align-items:center;gap:12px;position:sticky;top:0;z-index:100}.header-back{background:#fff2;border:none;color:var(--header-text);padding:6px 14px;border-radius:6px;cursor:pointer;font-size:.9rem;white-space:nowrap}.header-back:hover{background:#fff3}.header-title{font-size:1.1rem;font-weight:600;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.tabs{display:flex;gap:4px;background:#ffffff18;border-radius:10px;padding:4px}.tab-btn{padding:8px 24px;border:none;border-radius:7px;cursor:pointer;font-size:.92rem;font-weight:600;background:transparent;color:var(--header-text);opacity:.6;transition:all .15s}.tab-btn:hover{opacity:.85}.tab-btn.active{background:#ffffff30;opacity:1}.header-right{display:flex;align-items:center;gap:6px;flex:1;justify-content:flex-end}.header-auth-link{background:#fff2;border:none;color:var(--header-text);padding:6px 12px;border-radius:6px;cursor:pointer;font-size:.85rem;text-decoration:none;display:inline-block}.header-auth-link:hover{background:#fff3}.header-user{font-size:.82rem;color:#fff9}.header-logout{background:transparent;border:1px solid #ffffff30;color:var(--header-text);padding:6px 12px;border-radius:6px;cursor:pointer;font-size:.85rem;font-weight:500;transition:all .15s;white-space:nowrap}.header-logout:hover{background:#f332;border-color:#f445}.theme-btn{background:#fff2;border:none;color:var(--header-text);padding:6px 10px;border-radius:6px;cursor:pointer;font-size:1rem}.theme-btn:hover{background:#fff3}main{max-width:900px;margin:0 auto;padding:24px 16px}.loading{text-align:center;padding:60px;color:var(--muted2);font-size:1.1rem}.error-msg{text-align:center;padding:40px;color:#c62828}.filter-bar{position:relative;margin-bottom:12px}.filter-toggle{display:flex;align-items:center;gap:8px;padding:8px 14px;background:var(--card);border:1px solid var(--border);border-radius:8px;cursor:pointer;font-size:.88rem;color:var(--text);width:100%;justify-content:space-between}.filter-toggle:hover{border-color:var(--muted)}.filter-arrow{font-size:.7rem;color:var(--muted)}.filter-panel{position:absolute;top:calc(100% + 4px);left:0;z-index:10;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:8px 4px;display:flex;flex-direction:column;min-width:220px;box-shadow:0 4px 16px var(--hover-shadow)}.filter-option{display:flex;align-items:center;gap:10px;padding:8px 14px;cursor:pointer;font-size:.9rem;border-radius:6px;-webkit-user-select:none;user-select:none}.filter-option:hover{background:var(--btn-secondary-bg)}.filter-option-active{background:var(--btn-secondary-bg);font-weight:600}.filter-dot{width:16px;height:16px;border-radius:50%;flex-shrink:0;border:2px solid var(--border);background:var(--card);display:flex;align-items:center;justify-content:center;transition:all .15s}.filter-dot:after{content:"";width:7px;height:7px;border-radius:50%;background:transparent;transition:background .15s}.filter-dot-active{border-color:var(--btn-primary-bg)}.filter-dot-active:after{background:var(--btn-primary-bg)}.lesson-list{display:flex;flex-direction:column;gap:10px}.lesson-card{background:var(--card);border-radius:10px;padding:14px 18px;display:flex;align-items:center;gap:14px;cursor:pointer;border:1px solid var(--border);transition:box-shadow .15s,border-color .15s;text-decoration:none;color:inherit}.lesson-card:hover{box-shadow:0 2px 12px var(--hover-shadow);border-color:var(--muted)}.lesson-num{min-width:36px;height:36px;border-radius:50%;background:var(--btn-primary-bg);color:var(--btn-primary-text);display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;flex-shrink:0}.lesson-title{flex:1;font-size:.95rem;line-height:1.4}.lesson-badges{display:flex;gap:6px;flex-shrink:0;flex-wrap:wrap;align-items:center}.badge{font-size:.7rem;padding:2px 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var(--nav-btn-border);background:var(--nav-btn-bg);color:var(--text);cursor:pointer;font-size:1rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}.hw-nav>button:disabled{opacity:.3;cursor:default}.hw-nav>button:not(:disabled):hover{background:var(--nav-btn-hover)}.hw-counter{font-size:.9rem;color:var(--muted2);min-width:50px;text-align:center}.hw-dots{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.hw-dot{width:9px;height:9px;border-radius:50%;background:var(--dot);cursor:pointer;transition:all .15s;border:none;padding:0;flex-shrink:0}.hw-dot.done{background:var(--dot-done)}.hw-dot.active{box-shadow:0 0 0 2px var(--dot-active)}.hw-dot.active.done{box-shadow:0 0 0 2px var(--dot-done)}.hw-question{position:relative;margin-top:8px}.ege-number{position:absolute;top:-20px;right:0;font-size:.75rem;font-weight:700;color:var(--muted)}.question-body{font-size:.95rem;line-height:1.7;margin-bottom:16px}.question-body img{max-width:100%;border-radius:6px;margin:8px 0}.question-body figure{margin:8px 0}.question-body p{margin-bottom:8px}.answer-area{margin-top:4px;display:flex;flex-direction:column;gap:10px}.answer-box{background:var(--answer-bg);border-left:4px solid var(--answer-border);border-radius:0 8px 8px 0;padding:12px 16px}.answer-box .answer-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--answer-label);font-weight:700;margin-bottom:6px}.answer-value{font-size:1.05rem;font-weight:700;color:var(--answer-value)}.explanation-box{background:var(--expl-bg);border-left:4px solid var(--expl-border);border-radius:0 8px 8px 0;padding:12px 16px;font-size:.9rem;line-height:1.7}.explanation-box .expl-label{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--expl-label);font-weight:700;margin-bottom:8px}.explanation-box img{max-width:100%;border-radius:6px;margin:6px 0}.explanation-box figure{margin:6px 0}.explanation-box p{margin-bottom:6px}.answer-input-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.answer-input{flex:1;min-width:120px;padding:8px 12px;border:1px solid var(--input-border);border-radius:8px;font-size:.95rem;outline:none;background:var(--input-bg);color:var(--text);transition:border-color .15s}.answer-input:focus{border-color:var(--input-focus)}.answer-result{font-size:.9rem;font-weight:600;padding:4px 10px;border-radius:6px}.answer-result.correct{background:var(--correct-bg);color:var(--correct-text)}.answer-result.wrong{background:var(--wrong-bg);color:var(--wrong-text)}.scan-notice{font-size:.85rem;color:var(--muted2);font-style:italic}.btn-done{width:36px;height:36px;border-radius:50%;border:2px solid var(--border);background:var(--card);cursor:pointer;font-size:15px;color:var(--muted3);display:inline-flex;align-items:center;justify-content:center;transition:all .2s;box-shadow:0 1px 4px var(--hover-shadow)}.btn-done:hover{border-color:var(--dot-done);color:var(--dot-done)}.btn-done.done{background:var(--dot-done);border-color:var(--dot-done);color:#fff;box-shadow:0 2px 6px var(--hover-shadow)}.question-footer{display:flex;justify-content:flex-end;margin-top:14px}.video-split{display:flex;gap:16px}.video-split>div{flex:1}.file-row{display:flex;align-items:center;gap:6px;flex-wrap:wrap;width:100%;margin-bottom:4px}.file-name{font-size:.88rem;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ege-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:10px}.ege-card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:16px;text-align:center;cursor:pointer;transition:box-shadow .15s,border-color .15s;text-decoration:none;color:inherit;display:block}.ege-card:hover{box-shadow:0 2px 12px var(--hover-shadow);border-color:var(--muted)}.ege-card-num{font-size:1.4rem;font-weight:800;margin-bottom:6px}.ege-extra-header{margin:24px 0 12px;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.ege-extra-list{display:flex;flex-direction:column;gap:8px}.ege-extra-card{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px;background:var(--card);border:1px solid var(--border);border-radius:10px;text-decoration:none;color:inherit;transition:box-shadow .15s,border-color .15s}.ege-extra-card:hover{box-shadow:0 2px 12px var(--hover-shadow);border-color:var(--muted)}.ege-extra-name{font-size:1.1rem;font-weight:700}.ege-section-header{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:16px 20px;margin-bottom:14px;display:flex;align-items:center;gap:12px}.ege-section-num{font-size:1.8rem;font-weight:800}.ege-section-meta{font-size:.85rem;color:var(--muted2)}.ege-q-item{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:18px 20px;margin-bottom:14px}.ege-q-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.ege-q-counter{font-size:.8rem;font-weight:700;color:var(--muted)}.ege-q-lesson{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;color:var(--muted2);text-decoration:none;border-bottom:1px dashed var(--muted)}.ege-q-lesson:hover{color:var(--text)}mjx-container{max-width:100%;overflow-x:auto;overflow-y:hidden}mjx-container[display=true]{display:block!important}.question-actions{display:flex;align-items:center;gap:8px}.question-actions .btn-done{margin-left:auto}.lesson-title-row{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;flex-wrap:wrap}.lesson-title-text{font-weight:600;font-size:1.05rem;flex:1}.video-cols{display:flex;gap:24px;flex-wrap:wrap}.video-col{display:flex;flex-direction:column;gap:6px;flex:1;min-width:140px;align-items:flex-start}.auth-page{display:flex;justify-content:center;padding-top:48px}.auth-form{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:32px;width:100%;max-width:380px;display:flex;flex-direction:column;gap:14px}.auth-form h2{font-size:1.3rem;font-weight:700;text-align:center}.form-input{border:1px solid var(--input-border);border-radius:8px;padding:10px 14px;font-size:.95rem;background:var(--input-bg);color:var(--text);width:100%;outline:none}.form-input:focus{border-color:var(--input-focus)}.form-error{background:var(--wrong-bg);color:var(--wrong-text);border-radius:6px;padding:8px 12px;font-size:.88rem}.auth-switch{text-align:center;font-size:.88rem;color:var(--muted2)}.auth-switch a{color:var(--muted2);text-decoration:underline}.no-content{color:var(--muted3);font-size:.9rem;font-style:italic}.lesson-detail-actions{display:flex;justify-content:flex-end;margin-bottom:8px}@media(max-width:600px){.lesson-card{flex-wrap:wrap}.lesson-badges{width:100%;justify-content:flex-end}.video-split{flex-direction:column}.ege-grid{grid-template-columns:repeat(auto-fill,minmax(80px,1fr))}.tabs{display:none}}