*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,sans-serif}#root{min-height:100vh}:root{--primary-color: #646cff;--primary-hover: #535bf2;--background: #ffffff;--surface: #f9f9f9;--text: #213547;--text-secondary: #666;--border: #e0e0e0;--shadow: 0 2px 8px rgba(0,0,0,.1);--shadow-hover: 0 4px 16px rgba(0,0,0,.15);--border-radius: 12px;--spacing: 1rem;--transition-fast: .15s ease;--transition-normal: .3s ease;--transition-slow: .5s ease}.dark-mode{--primary-color: #7c7cff;--primary-hover: #9999ff;--background: #1a1a1a;--surface: #2d2d2d;--text: #ffffff;--text-secondary: #cccccc;--border: #404040;--shadow: 0 2px 8px rgba(0,0,0,.3);--shadow-hover: 0 4px 16px rgba(0,0,0,.4)}.dark-mode .auth-container{background:linear-gradient(135deg,#1a1a1a,#2d1b69)}.dark-mode .auth-card{background:var(--surface);border:1px solid var(--border)}.dark-mode .auth-input,.dark-mode .profile-button{background:var(--background);border-color:var(--border);color:var(--text)}.dark-mode 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var(--transition-fast);align-self:flex-end}.clear-all-toasts:hover{background:var(--primary-hover);transform:translateY(-1px)}.search-filter-container{background:#fff;padding:1.5rem;border-radius:var(--border-radius);box-shadow:var(--shadow);margin-bottom:2rem;margin-top:1rem}.search-bar{position:relative;margin-bottom:1rem}.search-input{padding-left:2.5rem}.search-icon{position:absolute;left:.75rem;top:50%;transform:translateY(-50%);color:#666}.filter-controls{display:flex;gap:1rem;align-items:center;flex-wrap:wrap}.filter-select{min-width:150px}.checkbox-label{display:flex;align-items:center;gap:.5rem;cursor:pointer;font-weight:500}.checkbox-label input[type=checkbox]{width:auto}.theme-toggle{background:none;border:2px solid var(--border);border-radius:50%;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all 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#e6d9ff}.category-title{font-weight:800;font-size:1.3rem;letter-spacing:.2px;margin:10px;color:var(--primary-color);text-align:center;white-space:nowrap}.subratings{list-style:none;margin:0;padding:0;display:grid;gap:8px}.subrating-row{display:grid;grid-template-columns:1fr auto;align-items:center;padding:8px 10px;border-radius:10px;background:var(--background)}.empty-note{color:var(--text-secondary);font-size:.95rem;padding:6px 0}.sub-name{display:inline-flex;align-items:center;gap:8px;min-width:0}.subcat-icon{width:26px;height:26px;border-radius:50%;object-fit:cover;flex:0 0 26px;border:1px solid var(--border, #ececec);box-shadow:0 2px 6px #0000000d}.subcat-icon.placeholder{display:grid;place-items:center;background:linear-gradient(135deg,#ffd1e8,#d9c3ff);color:#5a2bb3;font-weight:800;font-size:.85rem}.subcat-label{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.loading-spinner{width:40px;height:40px;border:4px solid #f3f3f3;border-top:4px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite;margin:2rem auto}.fade-in{animation:fadeIn var(--transition-slow) ease-in}.slide-in-left{animation:slideInLeft var(--transition-normal) ease-out}.slide-in-right{animation:slideInRight var(--transition-normal) ease-out}.bounce-in{animation:bounceIn .6s ease-out}.pulse{animation:pulse 2s infinite}.shake{animation:shake .5s ease-in-out}.stagger-item{opacity:0;transform:translateY(20px);animation:staggerIn .5s ease-out forwards}.stagger-item:nth-child(1){animation-delay:.1s}.stagger-item:nth-child(2){animation-delay:.2s}.stagger-item:nth-child(3){animation-delay:.3s}.stagger-item:nth-child(4){animation-delay:.4s}.stagger-item:nth-child(5){animation-delay:.5s}.stagger-item:nth-child(6){animation-delay:.6s}@keyframes pulse{0%{opacity:1}to{opacity:.6}}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}@keyframes 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.form-control{background:var(--surface);border-color:var(--border);color:var(--text)}.dark-mode .form-control:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px #7c7cff1a}.dark-mode .btn-secondary{background:var(--surface);color:var(--text);border-color:var(--border)}.dark-mode .btn-secondary:hover,.dark-mode .skeleton-image,.dark-mode .skeleton-text{background:#404040}.dark-mode .search-filter-container{background:var(--surface)}.dark-mode .toast-success{background:#1e4d3a;border-color:#2d5a3d;color:#a3d9b1}.dark-mode .toast-error{background:#4d1e1e;border-color:#5a2d2d;color:#d9a3a3}.dark-mode .toast-warning{background:#4d3d1e;border-color:#5a4a2d;color:#d9c3a3}.dark-mode .toast-info{background:#1e3d4d;border-color:#2d4a5a;color:#a3c3d9}@media (max-width: 1024px){.navbar-flex{flex-direction:column;align-items:stretch;gap:.5rem}.nav-link,.btn,.profile-button{width:100%;justify-content:center;font-size:1rem;padding:.75rem 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auto;align-items:start}.challenge-column{display:flex;flex-direction:column;gap:1rem;align-items:center}.challenge-header{text-align:center;margin-bottom:1rem;font-size:1.2rem;font-weight:700}@media (max-width: 900px){.three-column-challenges{grid-template-columns:1fr;gap:1.5rem}}.search-filter-container{padding:1rem}.filter-controls{flex-direction:column;gap:.75rem}.form-container{margin:1rem auto;padding:1.5rem}@media (max-width: 768px){.auth-card{padding:2rem 1.5rem;margin:1rem}.stagger-item{animation:none;opacity:1;transform:none}.card:hover{transform:none}}@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}img{max-width:100%;height:auto}.auth-container{min-height:calc(100vh - 94px);display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary-color) 0%,#9333ea 100%)}.auth-card{background:#fff;border-radius:20px;box-shadow:0 20px 40px #0000001a;padding:3rem;width:100%;max-width:450px;animation:slideUp .6s ease-out}.auth-header{text-align:center;margin-bottom:2rem}.auth-title{font-size:1.5rem;font-weight:700;color:var(--text);margin-bottom:.5rem;background:linear-gradient(135deg,var(--primary-color),#9333ea);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.auth-subtitle{color:var(--text-secondary);font-size:1rem;margin:0}.auth-form{margin-bottom:2rem}.auth-buttons{display:flex;align-items:center;gap:.75rem}.btn-outline{background:transparent;color:var(--text);border:2px solid var(--border)}.btn-outline:hover{background:var(--surface);border-color:var(--primary-color);color:var(--primary-color)}.logout-btn{font-size:.9rem;padding:.5rem 1rem}.input-wrapper{position:relative;margin-bottom:1rem}.input-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);font-size:1.2rem;z-index:2}.auth-input{padding-left:3rem!important;height:3rem;border:2px solid var(--border);transition:all var(--transition-normal);font-size:1rem}.auth-input:focus{border-color:var(--primary-color);box-shadow:0 0 0 4px #646cff1a;transform:translateY(-2px)}.auth-submit{width:100%;height:3rem;font-size:1.1rem;font-weight:600;margin-top:1rem;position:relative;overflow:hidden}.auth-submit.loading{pointer-events:none}.spinner{width:20px;height:20px;border:2px solid transparent;border-top:2px solid currentColor;border-radius:50%;animation:spin 1s linear infinite;margin-right:.5rem;display:inline-block}.auth-footer{text-align:center;padding-top:1rem;border-top:1px solid var(--border)}.forgot-password{text-align:center;margin-bottom:1rem}.modal-backdrop{text-align:center}.link-button{background:none;border:none;color:var(--primary-color);font-weight:600;cursor:pointer;text-decoration:underline;margin-left:.5rem;transition:color var(--transition-fast)}.link-button:hover{color:var(--primary-hover)}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.about-container{display:flex;justify-content:center;align-items:flex-start;min-height:60vh;padding:2rem 1rem}.about-card{background:var(--surface);border-radius:var(--border-radius);box-shadow:var(--shadow);padding:2.5rem 2rem;max-width:1000px;width:100%;border:1px solid var(--border);animation:fadeIn .7s}.about-title{font-size:2rem;font-weight:700;margin-bottom:1.5rem;text-align:center;letter-spacing:-1px}.about-list{list-style:disc inside;color:var(--text-secondary);font-size:1.1rem;margin-bottom:2rem;padding-left:1rem}.about-list li{margin-bottom:.75rem;line-height:1.6}.about-contact{text-align:center;font-size:1rem;color:var(--primary-color);margin-top:1.5rem;font-weight:500}.dark-mode .about-card{background:var(--surface);color:var(--text);border-color:var(--border)}.dark-mode .about-list{color:var(--text-secondary)}.challenge-footer-buttons{display:flex;justify-content:center;gap:1rem;margin:3rem 0 1.5rem}.footer-btn{display:flex;align-items:center;gap:.5rem;background:var(--primary-color);color:#fff;border:none;border-radius:var(--border-radius);padding:.75rem 1.5rem;font-size:1rem;font-weight:500;text-decoration:none;cursor:pointer;transition:background var(--transition-fast),transform var(--transition-fast);box-shadow:var(--shadow)}.footer-btn:hover{background:var(--primary-hover);transform:translateY(-2px)}.footer-btn-icon{font-size:1.2rem}.user-link{color:var(--primary-color);text-decoration:none;font-weight:600;cursor:pointer}.user-link:hover{text-decoration:underline}.result-uploaded{color:green;margin-left:8px;font-weight:700}.upload-container{display:flex;justify-content:center;padding:12px}.upload-card{background:#fff;border:1px solid var(--border, #ececec);border-radius:14px;padding:16px;box-shadow:0 6px 20px #0000000f;width:100%;max-width:720px}.upload-type-toggle{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 14px;justify-content:space-evenly}.toggle-btn{background:#f7f7f9;color:#444;border:1px solid #e6e6e9;border-radius:999px;padding:8px 12px}.toggle-btn.active{background:linear-gradient(135deg,#f6c,#8a2be2);color:#fff;border-color:transparent;box-shadow:0 4px 12px #8a2be240}.form-group{display:grid;gap:6px;margin-bottom:14px}.form-label{font-size:.85rem;color:var(--text-secondary, #6b7280)}.input,.textarea{width:100%;border:1px solid #e6e6e6;border-radius:10px;padding:10px 12px;outline:none;transition:border-color .15s ease,box-shadow .15s ease;background:#fff;color:var(--text, #111827)}.input:focus,.textarea:focus{border-color:#d4b7ff;box-shadow:0 0 0 3px #8a2be226}.textarea{min-height:120px;resize:vertical}.input-file{border:1px dashed #d6d6d6;border-radius:10px;padding:10px;background:#fafafa}.file-pill{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;margin-top:8px;background:#f8f4ff;color:#5a2bb3;border:1px solid #e4d8ff;border-radius:999px;font-weight:600}.file-size{color:#7c7c7c;font-weight:500}.helper-text{font-size:.8rem;color:#888}.submit-btn{width:100%;margin-top:6px;background:linear-gradient(135deg,#f6c,#8a2be2);color:#fff;border:none;box-shadow:0 6px 16px #8a2be240}.submit-btn[disabled]{background:#4a4a4a;color:#cfcfcf;box-shadow:none;cursor:not-allowed}.status-msg{margin-top:10px;padding:10px 12px;border-radius:10px;font-weight:600}.status-msg.success{background:#e7f7ef;color:#0e7a4b;border:1px solid rgba(14,122,75,.2)}.status-msg.error{background:#fee;color:#9b1c1c;border:1px solid rgba(155,28,28,.2)}.dark-mode .upload-card{background:#1f1f1f;border-color:#2a2a2a;box-shadow:0 6px 20px #00000040}.dark-mode .toggle-btn{background:#2a2a2f;color:#dcdcdc;border-color:#3a3a3f}.dark-mode .input,.dark-mode .textarea,.dark-mode .input-file{background:#222;color:#f0f0f0;border-color:#2f2f2f}.dark-mode .file-pill{background:#2a1f3f;color:#d8c9ff;border-color:#d8c9ff2e}