.app-layout{display:flex;min-height:100vh}.sidebar{width:180px;flex-shrink:0;background:#0003;padding:16px 0;display:flex;flex-direction:column;gap:4px;position:sticky;top:0;height:100vh}.sidebar-item{padding:12px 20px;border:none;background:transparent;color:#ffffffb3;text-align:left;cursor:pointer;font-size:.95rem;transition:all .2s;border-left:3px solid transparent}.sidebar-item:hover{background:#ffffff1a;color:#fff}.sidebar-item.active{background:#ffffff26;color:#fff;font-weight:600;border-left-color:#fff}.main-content{flex:1;min-width:0}.app{max-width:720px;margin:0 auto;padding:16px 16px 48px}.sublist-tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:16px;align-items:center}.tab{padding:6px 12px;border:none;border-radius:16px;background:#ffffff40;color:#fff;font-size:.8rem;cursor:pointer;transition:all .2s}.tab:hover{background:#fff6}.tab.active{background:#fff;color:#4a8a2e;font-weight:600}.btn-icon{width:32px;height:32px;border:none;border-radius:50%;background:#ffffff40;color:#fff;font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s;margin-left:auto}.btn-icon:hover{background:#fff6}.settings-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;background:transparent}.settings-menu{position:absolute;top:56px;right:16px;background:#fff;border-radius:10px;box-shadow:0 6px 20px #0003;padding:6px;min-width:180px;z-index:201;overflow:hidden}.settings-item{display:flex;width:100%;padding:10px 14px;border:none;background:transparent;color:#333;font-size:.9rem;text-align:left;cursor:pointer;border-radius:6px;transition:background .15s;align-items:center;gap:8px}.settings-item:hover:not(:disabled){background:#f0f0f5}.settings-item:disabled{opacity:.45;cursor:not-allowed}.settings-toggle{cursor:pointer;-webkit-user-select:none;user-select:none}.settings-toggle input{width:16px;height:16px;cursor:pointer}.settings-divider{height:1px;background:#eee;margin:4px 0}.settings-danger{color:#e74c3c}.settings-danger:hover{background:#fdecea!important}.card-area{display:flex;flex-direction:column;align-items:center}.card{width:100%;max-width:500px;min-height:280px;background:#fff;border-radius:16px;box-shadow:0 8px 24px #00000026;cursor:pointer;position:relative;transition:transform .4s;transform-style:preserve-3d;margin-bottom:16px;display:flex;align-items:center;justify-content:center;padding:32px}.card.flipped{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;-webkit-backface-visibility:hidden;-moz-backface-visibility:hidden;backface-visibility:hidden;border-radius:16px;transform:translateZ(0)}.card-back{transform:translateZ(0) rotateY(180deg)}.card.empty{background:#fff;cursor:default}.word{font-size:2.5rem;font-weight:700;color:#1a1a2e;margin-bottom:8px;word-break:break-word}.phonetic{font-size:1.1rem;color:#888;margin-bottom:16px}.definition{font-size:1rem;color:#333;line-height:1.6;text-align:center;max-width:420px}.hint{font-size:.85rem;color:#aaa;margin-top:24px}.card-nav{display:flex;align-items:center;gap:12px;margin-bottom:12px;flex-wrap:wrap;justify-content:center}.card-meta{display:flex;flex-direction:column;align-items:center;gap:4px}.counter-row{display:flex;align-items:center;gap:12px}.card-counter{font-size:.9rem;color:#fffffff2;font-weight:500}.card-percent{font-size:.9rem;color:#fffffff2;font-weight:600}.shortcuts{font-size:.72rem;color:#ffffffb3}.btn{padding:8px 18px;border:none;border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-lg{padding:14px 22px;font-size:1rem;font-weight:600;border-radius:10px;min-width:110px}.btn-primary{background:#fff;color:#4a8a2e}.btn-primary:not(:disabled):hover{transform:translateY(-1px);box-shadow:0 4px 12px #00000026}.btn-secondary{background:#ffffff40;color:#fff}.btn-secondary:not(:disabled):hover{background:#fff6}.btn-wrong{background:#e74c3c;color:#fff}.btn-wrong:hover{background:#c0392b;transform:translateY(-1px)}@media(max-width:480px){.word{font-size:2rem}.card-nav{flex-wrap:wrap;justify-content:center}.btn-lg{padding:12px 18px;font-size:.95rem;min-width:90px}}.paper-view{max-width:820px;margin:0 auto;padding:24px 16px 48px}.lang-tabs{display:flex;gap:8px;margin-bottom:20px}.lang-tab{padding:6px 18px;border:none;border-radius:16px;background:#ffffff40;color:#fff;font-size:.85rem;cursor:pointer;transition:all .2s}.lang-tab:hover{background:#fff6}.lang-tab.active{background:#fff;color:#4a8a2e;font-weight:600}.paper-content{background:#fff;border-radius:12px;padding:32px 36px;line-height:1.8;color:#333;box-shadow:0 4px 16px #0000001a}.paper-content h1{font-size:1.5rem;margin:24px 0 16px;color:#1a1a2e;border-bottom:2px solid #eee;padding-bottom:8px}.paper-content h2{font-size:1.25rem;margin:20px 0 12px;color:#1a1a2e}.paper-content h3{font-size:1.05rem;margin:16px 0 8px;color:#333}.paper-content p{margin:8px 0}.paper-content ul,.paper-content ol{margin:8px 0;padding-left:24px}.paper-content li{margin:4px 0}.paper-content table{width:100%;border-collapse:collapse;margin:16px 0;font-size:.9rem}.paper-content th,.paper-content td{border:1px solid #ddd;padding:8px 12px;text-align:left}.paper-content th{background:#f5f5fa;font-weight:600;color:#1a1a2e}.paper-content tr:nth-child(2n){background:#fafafe}.paper-content blockquote{border-left:4px solid #4a8a2e;margin:12px 0;padding:8px 16px;background:#f8f8fc;border-radius:0 8px 8px 0;color:#555}.paper-content code{background:#f0f0f5;padding:2px 6px;border-radius:4px;font-size:.88em;font-family:Consolas,Monaco,monospace}.paper-content hr{border:none;border-top:1px solid #eee;margin:24px 0}.paper-content strong{font-weight:600;color:#1a1a2e}.paper-content em{font-style:italic}@media(max-width:768px){.app-layout{flex-direction:column}.sidebar{width:100%;height:auto;position:relative;flex-direction:row;padding:8px 12px;gap:4px}.sidebar-item{padding:8px 16px;border-left:none;border-bottom:3px solid transparent;border-radius:8px}.sidebar-item.active{border-left:none;border-bottom-color:#fff;border-radius:8px}.paper-content{padding:20px 16px}}:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.5;color:#1a1a2e;background:linear-gradient(135deg,#f6d365,#6a9a3e);min-height:100vh}*{margin:0;padding:0;box-sizing:border-box}body{min-height:100vh}