:root{--font-sm:14px;--font-base:16px;--font-lg:18px;--line-height-normal:1.5;--line-height-relaxed:1.625;--space-xs:2px;--space-sm:4px;--space-md:8px;--space-lg:12px;--space-xl:16px;--space-2xl:24px;--color-neutral-50:#f7f4ef;--color-neutral-100:#f0ece6;--color-neutral-200:#ddd6cc;--color-neutral-300:#c4bab0;--color-neutral-400:#9e9085;--color-neutral-500:#7a6d63;--color-neutral-600:#5c5046;--color-neutral-700:#3d3129;--color-neutral-800:#241e17;--color-neutral-900:#1c1814;--color-primary-50:#fdf1ef;--color-primary-100:#f9d9d4;--color-primary-200:#f2b3a9;--color-primary-300:#e7846f;--color-primary-400:#d95d48;--color-primary-500:#c23a2b;--color-primary-600:#a52d21;--color-primary-700:#831f16;--color-secondary-50:#ecf7f6;--color-secondary-100:#c6eae7;--color-secondary-200:#90d4cf;--color-secondary-300:#59bdb7;--color-secondary-400:#35a49e;--color-secondary-500:#2a8a85;--color-secondary-600:#22706b;--color-secondary-700:#1a5753;--color-success-50:#f0fdf6;--color-success-200:#a7f3c8;--color-success-500:#21a85a;--color-success-600:#178045;--color-success-700:#116036;--color-error-50:#fff1f1;--color-error-500:#dc2626;--color-error-700:#991b1b;--color-white:#fffdf9;--color-black:#000;--color-border:var(--color-neutral-200);--color-border-light:var(--color-neutral-100);--color-bg-primary:var(--color-white);--color-bg-secondary:var(--color-neutral-50);--color-text-primary:var(--color-neutral-900);--color-text-secondary:var(--color-neutral-700);--color-text-muted:var(--color-neutral-600);--shadow-sm:0 1px 3px rgba(28,24,20,0.07),0 1px 2px rgba(28,24,20,0.04)}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{font-family:Noto Sans TC,PingFang TC,Helvetica Neue,Arial,sans-serif;background:var(--color-neutral-50);color:var(--color-text-primary);min-height:100vh;-webkit-font-smoothing:antialiased}#app{max-width:800px;margin:0 auto;padding:1.25rem 1.25rem 5rem}.header{justify-content:space-between;margin-bottom:.5rem;gap:8px}.header,.header-user{display:flex;align-items:center}.header-user{gap:var(--space-md);flex-shrink:0}.header-status{margin-bottom:.75rem;overflow:hidden}.logo{font-family:inherit;font-size:var(--font-lg);font-weight:700;color:var(--color-text-primary);letter-spacing:.02em;line-height:1;white-space:nowrap}.logo span{color:var(--color-primary-500)}.badge{display:inline-block;font-size:12px;background:var(--color-neutral-100);color:var(--color-text-secondary);padding:4px 12px;border-radius:20px;border:1px solid var(--color-neutral-200);line-height:1.5;max-width:100%;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;vertical-align:middle}.progress-bar{height:3px;background:var(--color-neutral-200);border-radius:2px;overflow:hidden;margin-bottom:1.25rem}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary-500) 0,var(--color-primary-400) 100%);border-radius:2px;transition:width .5s ease}.tabs{display:flex;border-bottom:1px solid var(--color-border);margin-bottom:1.5rem;overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;-webkit-overflow-scrolling:touch;gap:0;scrollbar-width:none}.tabs::-webkit-scrollbar{display:none}.tab{padding:9px 14px;font-size:var(--font-sm);font-weight:500;cursor:pointer;background:none;color:var(--color-text-muted);border:none;border-bottom:2px solid transparent;margin-bottom:-1px;transition:all .2s;white-space:nowrap;font-family:inherit;text-decoration:none;letter-spacing:.01em;flex-shrink:0}.tab.active{color:var(--color-primary-500);border-bottom-color:var(--color-primary-500)}.tab:hover:not(.active){color:var(--color-neutral-700);background:var(--color-neutral-100)}.card{background:var(--color-bg-primary);border:1px solid var(--color-border);border-radius:12px;padding:1.25rem;box-shadow:var(--shadow-sm)}.card+.card{margin-top:1rem}.gc{border-top:3px solid var(--color-primary-400);padding:1.25rem 1.5rem}.gc-header{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem;margin-bottom:.875rem}.gc-header-text{min-width:0}.gc-fav{flex-shrink:0;border:none;background:none;padding:0;line-height:1;font-size:1.5rem;cursor:pointer;color:var(--color-text-muted);transition:color .15s,transform .15s}.gc-fav:hover:not(:disabled){color:var(--color-primary-400);transform:scale(1.15)}.gc-fav.active{color:var(--color-primary-500)}.gc-fav:disabled{cursor:default;opacity:.4}.grammar-item-star{color:var(--color-primary-500);margin-right:.35rem}.gc-grammar{display:block;font-family:inherit;font-size:1.625rem;font-weight:700;color:var(--color-text-primary);letter-spacing:.02em;line-height:1.2}.gc-reading{display:block;font-size:12px;color:var(--color-text-muted);letter-spacing:.06em;margin-top:.35rem}.gc-meaning{font-size:var(--font-base);font-weight:600;color:var(--color-text-primary);line-height:1.4;margin-bottom:.5rem}.gc-divider{border:none;border-top:1px solid var(--color-border);margin:.875rem 0}.gc-examples{display:flex;flex-direction:column;gap:.875rem}.gc-example{padding-left:.75rem;border-left:2px solid var(--color-neutral-200)}.gc-jp{color:var(--color-text-primary)}.gc-jp,.gc-zh{font-size:var(--font-sm);line-height:var(--line-height-relaxed)}.gc-zh{color:var(--color-text-muted);margin-top:.15rem}.gc-meta{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:.875rem;padding-top:.75rem;border-top:1px solid var(--color-border-light)}.gc-supplement{width:100%;color:var(--color-primary-600);line-height:var(--line-height-normal);white-space:pre-wrap}.gc-page,.gc-supplement{font-size:var(--font-sm)}.gc-page{margin-right:auto}.gc-page,.section-label{color:var(--color-text-muted)}.section-label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:.625rem;font-weight:500}.reading{font-size:var(--font-sm);color:var(--color-text-muted);margin-bottom:.4rem}.tags{display:flex;gap:5px;flex-wrap:wrap;margin-top:.75rem}.tag{font-size:12px;padding:2px 8px;border-radius:10px;background:var(--color-primary-50);color:var(--color-primary-600);border:1px solid var(--color-primary-100);font-weight:500}button{cursor:pointer;font-family:inherit}.btn{padding:7px 14px;border-radius:8px;border:1px solid var(--color-border);background:var(--color-bg-primary);font-size:var(--font-sm);color:var(--color-text-secondary);transition:all .15s;font-weight:500}.btn:hover{background:var(--color-neutral-50);color:var(--color-text-primary);border-color:var(--color-neutral-300)}.btn-primary{background:var(--color-primary-500);color:var(--color-white);border-color:var(--color-primary-500)}.btn-primary:hover{background:var(--color-primary-600);color:var(--color-white);border-color:var(--color-primary-600)}.btn-secondary{background:var(--color-secondary-500);color:var(--color-white);border-color:var(--color-secondary-500);text-decoration:none}.btn-secondary:hover{background:var(--color-secondary-600);color:var(--color-white);border-color:var(--color-secondary-600)}.btn-sm{padding:4px 10px;font-size:12px}.btn-ghost{color:var(--color-primary-500);padding-left:0}.btn-ghost,.btn-ghost:hover{border-color:transparent;background:none}.btn-ghost:hover{color:var(--color-primary-600)}.search-wrap{position:relative;margin-bottom:.75rem}.search-box{width:100%;padding:10px 36px 10px 14px;border-radius:10px;border:1px solid var(--color-border);background:var(--color-bg-primary);color:var(--color-text-primary);font-size:var(--font-base);outline:none;font-family:inherit;box-shadow:var(--shadow-sm);transition:border-color .2s,box-shadow .2s}.search-box:focus{border-color:var(--color-primary-400);box-shadow:0 0 0 3px var(--color-primary-50)}.search-clear{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:none;border:none;color:var(--color-neutral-400);font-size:var(--font-base);cursor:pointer;padding:2px 6px}.prefix-filter{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;margin-bottom:.75rem;padding-bottom:2px}.prefix-filter::-webkit-scrollbar{display:none}.prefix-chip{flex-shrink:0;padding:4px 10px;border-radius:20px;border:1px solid var(--color-border);background:var(--color-bg-primary);font-size:12px;color:var(--color-text-secondary);cursor:pointer;font-family:inherit;font-weight:500;transition:background .15s,border-color .15s,color .15s;white-space:nowrap}.prefix-chip:hover:not(.active){border-color:var(--color-primary-300);color:var(--color-primary-500);background:var(--color-primary-50)}.prefix-chip.active{background:var(--color-primary-500);border-color:var(--color-primary-500);color:var(--color-white)}.filter-row{display:flex;gap:8px;align-items:center;margin-bottom:1rem;flex-wrap:wrap}.filter-count{font-size:var(--font-sm);color:var(--color-text-muted)}.sort-tabs{display:flex;background:var(--color-neutral-200);border-radius:9px;padding:2px;gap:2px;flex-shrink:0;overflow-x:auto;scrollbar-width:none;max-width:100%}.sort-tabs::-webkit-scrollbar{display:none}.sort-tab{flex:1 1;padding:4px 9px;border:none;background:transparent;border-radius:7px;font-size:12px;color:var(--color-text-secondary);transition:background .15s,color .15s,box-shadow .15s;white-space:nowrap;font-family:inherit;font-weight:500}.sort-tab.active{background:var(--color-white);color:var(--color-text-primary);box-shadow:0 1px 3px rgba(28,24,20,.12)}.grammar-list{display:flex;flex-direction:column}.grammar-item{padding:.75rem 1.125rem;border-bottom:1px solid var(--color-border-light);cursor:pointer;transition:background .1s;display:flex;align-items:center;justify-content:space-between;gap:.5rem}.grammar-item:last-child{border-bottom:none}.grammar-item:hover{background:var(--color-primary-50)}.grammar-item-name{font-size:var(--font-base);font-weight:600;color:var(--color-text-primary);font-family:inherit}.grammar-item-meaning{font-size:var(--font-sm);color:var(--color-text-secondary);margin-top:2px}.cycle-badge{font-size:12px;padding:2px 8px;border-radius:10px;background:var(--color-secondary-50);color:var(--color-secondary-600);border:1px solid var(--color-secondary-100);white-space:nowrap;flex-shrink:0;font-weight:500}.question-card{background:var(--color-bg-primary);border:1px solid var(--color-border);border-radius:12px;padding:1.75rem 1.5rem;margin-bottom:1rem;display:flex;flex-direction:column;align-items:flex-start;text-align:left;box-shadow:var(--shadow-sm)}.question-card .tags{justify-content:flex-start}.question-grammar{font-family:inherit;font-size:1.75rem;font-weight:700;color:var(--color-text-primary);margin:.875rem 0;letter-spacing:.02em}.question-options{width:100%;margin-top:1.25rem}.answer-feedback{margin-top:.875rem;text-align:left}.answer-bar{display:flex;align-items:center;justify-content:space-between;padding:.5rem 0;margin-bottom:.5rem}.answer-bar .btn{flex-shrink:0;margin-left:1rem}.answer-result-text{font-size:var(--font-base);font-weight:600}.grid2{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px;margin-bottom:1rem}.select-input{padding:8px 12px;color:var(--color-text-primary);outline:none;max-width:100%;box-shadow:var(--shadow-sm)}.answer-option,.select-input{border-radius:8px;border:1px solid var(--color-border);background:var(--color-bg-primary);font-size:var(--font-base);font-family:inherit}.answer-option{display:block;width:100%;padding:11px 14px;color:var(--color-text-secondary);margin-bottom:8px;transition:all .15s;text-align:left;line-height:var(--line-height-normal)}.answer-option:hover:not(:disabled){border-color:var(--color-primary-300);color:var(--color-text-primary);background:var(--color-primary-50)}.answer-option.correct{background:var(--color-success-50);border-color:var(--color-success-500);color:var(--color-success-700);font-weight:600}.answer-option.wrong{background:var(--color-error-50);border-color:var(--color-error-500);color:var(--color-error-700)}.answer-option.viewing{outline:2px solid var(--color-neutral-700);outline-offset:2px}.forget-btn{display:block;width:100%;padding:11px 14px;margin-top:4px;border-radius:8px;border:1px dashed var(--color-border);background:var(--color-bg-primary);font-family:inherit;font-size:var(--font-base);color:var(--color-text-muted);text-align:center;cursor:pointer;transition:all .15s}.forget-btn:hover{border-color:var(--color-error-500);color:var(--color-error-700);background:var(--color-error-50)}.result-badge{font-size:12px;padding:2px 8px;border-radius:10px;white-space:nowrap;flex-shrink:0;font-weight:500}.result-badge.correct{background:var(--color-success-50);color:var(--color-success-600);border:1px solid var(--color-success-200)}.result-badge.wrong{background:var(--color-error-50);color:var(--color-error-700);border:1px solid var(--color-error-500)}.start-card{text-align:center;padding:2.5rem 1.75rem}.start-title{font-family:inherit;font-size:var(--font-lg);font-weight:700;color:var(--color-text-primary);margin-bottom:.5rem}.start-description{font-size:var(--font-base);color:var(--color-text-secondary);margin-bottom:1.5rem;line-height:var(--line-height-relaxed)}.session-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;font-size:var(--font-sm);color:var(--color-text-secondary)}.question-prompt{color:var(--color-text-primary);line-height:var(--line-height-relaxed);margin:.625rem 0 .875rem}.question-prompt.jp{font-family:inherit;font-size:var(--font-lg);font-weight:600}.pager{display:flex;gap:6px;align-items:center;justify-content:center;margin-top:1rem;flex-wrap:wrap}.pager-btn{padding:5px 10px;border-radius:6px;border:1px solid var(--color-border);background:var(--color-bg-primary);font-size:var(--font-sm);color:var(--color-text-secondary);cursor:pointer;font-family:inherit;font-weight:500}.pager-btn:hover{background:var(--color-neutral-50);border-color:var(--color-neutral-300)}.pager-btn.active{background:var(--color-primary-500);color:var(--color-white);border-color:var(--color-primary-500)}.pager-info{font-size:var(--font-sm);color:var(--color-text-muted)}.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--space-2xl)}.login-card{max-width:380px;width:100%;text-align:center;padding:2.5rem 2rem}.login-logo{font-family:inherit;font-size:var(--font-lg);font-weight:700;margin-bottom:var(--space-md);letter-spacing:.02em}.login-logo span{color:var(--color-primary-500)}.login-desc{color:var(--color-text-secondary);margin-bottom:2rem;line-height:var(--line-height-relaxed)}.btn-google,.login-desc{font-size:var(--font-base)}.btn-google{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;box-sizing:border-box;text-decoration:none}@media (max-width:620px){.grid2{grid-template-columns:1fr}}@media (max-width:480px){#app{padding:1rem .875rem 5rem}.question-card{padding:1.25rem 1rem}.gc{padding:1rem 1.125rem}.gc-grammar{font-size:1.375rem}.question-grammar{font-size:1.5rem}.answer-option{padding:10px 12px;margin-bottom:6px}.answer-bar{padding:.375rem 0}.card{padding:1rem}.start-card{padding:2rem 1.25rem}.grammar-item{padding:.625rem .875rem}}@media (max-width:360px){.tab{padding:8px 10px;font-size:12px}.logo{font-size:var(--font-base)}.badge{font-size:11px;padding:3px 10px}.gc-grammar{font-size:1.25rem}}