*,:before,:after{box-sizing:border-box}html,body,#root{height:100%;margin:0;padding:0}body{-webkit-font-smoothing:antialiased}button{font-family:inherit}*,:before,:after{box-sizing:border-box;margin:0;padding:0}.app{--bg:#f5f5f7;--surface:#fff;--surface2:#f0f0f2;--border:#e2e2e6;--text:#111112;--text2:#6b6b80;--accent:#5b5ef4;--accent-hover:#4547d4;--correct:#16a34a;--correct-bg:#dcfce7;--wrong:#dc2626;--wrong-bg:#fee2e2;--skip-bg:#f3f4f6;--radius:14px;--shadow:0 2px 12px #00000012;background:var(--bg);min-height:100dvh;color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5;transition:background .2s,color .2s}.app.theme-dark{--bg:#0d0d10;--surface:#18181d;--surface2:#222228;--border:#2e2e38;--text:#f0f0f5;--text2:#8888a8;--accent:#7c7eff;--accent-hover:#9a9cff;--correct-bg:#14532d88;--wrong-bg:#7f1d1d88;--skip-bg:#1e1e28;--shadow:0 2px 16px #0000004d}.page{flex-direction:column;min-height:100dvh;display:flex}.loading{min-height:60vh;color:var(--text2);justify-content:center;align-items:center;font-size:1.1rem;display:flex}.top-bar{background:var(--surface);border-bottom:1px solid var(--border);z-index:10;justify-content:space-between;align-items:center;padding:14px 20px;display:flex;position:sticky;top:0}.site-title{letter-spacing:-.3px;color:var(--accent);font-size:1.05rem;font-weight:700}.btn-back{cursor:pointer;color:var(--text2);background:0 0;border:none;border-radius:8px;align-items:center;gap:6px;padding:6px 10px;font-size:.9rem;font-weight:500;transition:background .15s,color .15s;display:flex}.btn-back:hover{background:var(--surface2);color:var(--text)}.theme-btn{border:1px solid var(--border);cursor:pointer;color:var(--text2);background:0 0;border-radius:8px;align-items:center;padding:6px 8px;transition:background .15s,color .15s;display:flex}.theme-btn:hover{background:var(--surface2);color:var(--text)}.center-content{flex-direction:column;flex:1;align-items:center;padding:48px 20px 40px;display:flex}.hero-title{letter-spacing:-.5px;margin-bottom:6px;font-size:2rem;font-weight:800}.hero-sub{color:var(--text2);margin-bottom:36px;font-size:1rem}.subject-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;width:100%;max-width:900px;display:grid}.subject-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);text-align:left;cursor:pointer;box-shadow:var(--shadow);flex-direction:column;gap:6px;padding:24px 22px;transition:transform .15s,box-shadow .15s,border-color .15s;display:flex}.subject-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 6px 24px #0000001a}.subject-name{color:var(--text);font-size:1.1rem;font-weight:700}.subject-meta{color:var(--text2);font-size:.85rem}.mode-main{flex:1;width:100%;max-width:760px;margin:0 auto;padding:32px 20px 60px}.mode-title{letter-spacing:-.4px;margin-bottom:20px;font-size:1.7rem;font-weight:800}.practice-toggle-row{background:var(--surface);border:1px solid var(--border);border-radius:12px;align-items:center;gap:12px;margin-bottom:32px;padding:14px 16px;display:flex}.practice-label{font-size:.95rem;font-weight:600}.toggle-pill{cursor:pointer;background:var(--border);border:none;border-radius:12px;flex-shrink:0;width:44px;height:24px;transition:background .2s;position:relative}.toggle-pill.on{background:var(--accent)}.toggle-knob{background:#fff;border-radius:50%;width:18px;height:18px;transition:transform .2s;display:block;position:absolute;top:3px;left:3px}.toggle-pill.on .toggle-knob{transform:translate(20px)}.practice-hint{color:var(--text2);font-size:.82rem}.mode-section{margin-bottom:32px}.mode-section-title{margin-bottom:4px;font-size:1rem;font-weight:700}.mode-section-sub{color:var(--text2);margin-bottom:12px;font-size:.85rem}.mode-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;display:grid}.mode-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;text-align:left;box-shadow:var(--shadow);flex-direction:column;gap:4px;padding:16px 18px;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex}.mode-card:hover{border-color:var(--accent);transform:translateY(-1px);box-shadow:0 4px 16px #0000001a}.mode-card-title{color:var(--text);font-size:.95rem;font-weight:700}.mode-card-desc{color:var(--text2);font-size:.8rem}.mode-card-badge{color:var(--accent);font-size:.78rem;font-weight:600}.mode-full{flex-direction:row;justify-content:space-between;align-items:center}.week-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;display:grid}.week-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;text-align:left;box-shadow:var(--shadow);flex-direction:column;gap:3px;padding:14px 16px;transition:transform .15s,border-color .15s;display:flex}.week-card:hover{border-color:var(--accent);transform:translateY(-1px)}.week-num{color:var(--accent);font-size:.85rem;font-weight:700}.week-label{color:var(--text);font-size:.85rem}.quiz-header{background:var(--surface);border-bottom:1px solid var(--border);z-index:10;padding:12px 20px 0;position:sticky;top:0}.quiz-header-left{align-items:center;gap:12px;display:flex}.quiz-header-right{position:absolute;top:12px;right:20px}.quiz-title{font-size:.95rem;font-weight:700}.quiz-sub{color:var(--text2);font-size:.8rem}.progress-bar{background:var(--border);height:3px;margin-top:12px}.progress-fill{background:var(--accent);height:100%;transition:width .3s}.progress-fill.pass{background:var(--correct)}.progress-fill.fail{background:var(--wrong)}.quiz-main{flex:1;width:100%;max-width:760px;margin:0 auto;padding:28px 20px 80px}.score-banner{border-radius:var(--radius);border:1px solid;flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:28px;padding:16px 20px;display:flex}.score-pass{background:var(--correct-bg);border-color:var(--correct);color:var(--correct)}.score-fail{background:var(--wrong-bg);border-color:var(--wrong);color:var(--wrong)}.score-emoji{font-size:1.4rem}.score-text{flex:1;font-size:1.1rem;font-weight:700}.btn-retry{background:var(--surface);border:1px solid var(--border);cursor:pointer;color:var(--text);border-radius:8px;padding:8px 16px;font-size:.88rem;font-weight:600;transition:background .15s}.btn-retry:hover{background:var(--surface2)}.questions-list{flex-direction:column;gap:16px;display:flex}.q-card{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 20px 16px;transition:border-color .2s,background .2s}.q-correct{border-color:var(--correct);background:var(--correct-bg)}.q-wrong{border-color:var(--wrong);background:var(--wrong-bg)}.q-skip{border-color:var(--border);background:var(--skip-bg)}.q-header{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:10px;display:flex}.q-num{color:var(--text2);font-size:.82rem;font-weight:700}.q-type-hint{color:var(--accent);background:color-mix(in srgb, var(--accent) 12%, transparent);border-radius:20px;padding:2px 8px;font-size:.76rem;font-weight:600}.q-badge{border-radius:20px;padding:2px 8px;font-size:.78rem;font-weight:600}.badge-correct{background:var(--correct-bg);color:var(--correct)}.badge-wrong{background:var(--wrong-bg);color:var(--wrong)}.badge-skip{background:var(--skip-bg);color:var(--text2)}.q-text{color:var(--text);margin-bottom:14px;font-size:.97rem;font-weight:500;line-height:1.55}.options{flex-direction:column;gap:8px;display:flex}.option{background:var(--surface2);border:1.5px solid var(--border);cursor:pointer;text-align:left;border-radius:10px;align-items:flex-start;gap:10px;width:100%;padding:10px 14px;transition:border-color .15s,background .15s;display:flex}.option:hover:not(:disabled),.option.selected{border-color:var(--accent);background:var(--surface)}.option.opt-correct{border-color:var(--correct);background:var(--correct-bg)}.option.opt-wrong{border-color:var(--wrong);background:var(--wrong-bg)}.option:disabled{cursor:default}.opt-marker{background:var(--border);width:22px;height:22px;color:var(--text2);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.75rem;font-weight:700;display:flex}.option.selected .opt-marker{background:var(--accent);color:#fff}.option.opt-correct .opt-marker{background:var(--correct);color:#fff}.option.opt-wrong .opt-marker{background:var(--wrong);color:#fff}.opt-text{color:var(--text);padding-top:2px;font-size:.9rem;line-height:1.45}.fill-area{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.fill-input{border:1.5px solid var(--border);background:var(--surface2);min-width:200px;color:var(--text);border-radius:10px;outline:none;flex:1;padding:10px 14px;font-size:.92rem;transition:border-color .15s}.fill-input:focus{border-color:var(--accent)}.fill-input:disabled{opacity:.7;cursor:default}.fill-confirm{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:10px 18px;font-size:.88rem;font-weight:600;transition:background .15s}.fill-confirm:hover:not(:disabled){background:var(--accent-hover)}.fill-confirm:disabled{opacity:.5;cursor:default}.correct-answer{color:var(--text2);width:100%;margin-top:4px;font-size:.88rem}.range-hint{opacity:.75;font-size:.8rem}.opt-checkbox{border:2px solid var(--border);background:var(--surface2);border-radius:4px;justify-content:center;align-items:center;transition:border-color .15s,background .15s;display:flex}.option-multi.selected .opt-checkbox{border-color:var(--accent);background:var(--accent);color:#fff}.option-multi.opt-correct .opt-checkbox{border-color:var(--correct);background:var(--correct);color:#fff}.option-multi.opt-wrong .opt-checkbox{border-color:var(--wrong);background:var(--wrong);color:#fff}.submit-row{background:var(--surface);border-top:1px solid var(--border);z-index:20;justify-content:flex-end;align-items:center;gap:14px;padding:14px 20px;display:flex;position:fixed;bottom:0;left:0;right:0}.unanswered-hint{color:var(--text2);font-size:.85rem}.btn-submit{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:12px 28px;font-size:.95rem;font-weight:700;transition:background .15s,transform .1s}.btn-submit:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-submit:active{transform:translateY(0)}@media (width<=520px){.hero-title{font-size:1.5rem}.mode-full{flex-direction:column}.week-grid{grid-template-columns:1fr 1fr}.practice-hint{display:none}}