:root{--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--secondary: #0ea5e9;--accent: #8b5cf6;--success: #10b981;--success-light: #ecfdf5;--warning: #f59e0b;--warning-light: #fffbeb;--danger: #ef4444;--danger-light: #fef2f2;--bg-main: #f8fafc;--bg-card: #ffffff;--bg-card-hover: #f1f5f9;--bg-glass: rgba(255, 255, 255, .85);--text-main: #0f172a;--text-muted: #64748b;--text-light: #94a3b8;--border: #e2e8f0;--border-focus: #6366f1;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .04);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .04);--shadow-glow: 0 0 20px rgba(79, 70, 229, .25);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-full: 9999px;--transition: all .2s cubic-bezier(.4, 0, .2, 1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Plus Jakarta Sans,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-main);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased;min-height:100vh}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:#f1f5f9}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:9999px}::-webkit-scrollbar-thumb:hover{background:#94a3b8}.app-container{min-height:100vh;display:flex;flex-direction:column}.header-glass{position:sticky;top:0;z-index:50;background:#ffffffe6;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(226,232,240,.8);box-shadow:0 1px 3px #00000008}.header-content{max-width:1380px;margin:0 auto;padding:.75rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1.5rem}.brand-box{display:flex;align-items:center;gap:.75rem;text-decoration:none;cursor:pointer}.brand-icon{width:40px;height:40px;background:linear-gradient(135deg,#4f46e5,#7c3aed);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 4px 10px #4f46e54d}.brand-title{font-family:Outfit,sans-serif;font-size:1.35rem;font-weight:800;background:linear-gradient(135deg,#1e1b4b,#4338ca);-webkit-background-clip:text;-webkit-text-fill-color:transparent;letter-spacing:-.5px}.brand-badge{font-size:.7rem;font-weight:600;padding:2px 8px;background:var(--primary-light);color:var(--primary);border-radius:var(--radius-full);margin-left:4px}.stage-selector{display:flex;background:#f1f5f9;padding:4px;border-radius:var(--radius-full);border:1px solid var(--border)}.stage-btn{padding:6px 18px;border-radius:var(--radius-full);font-size:.875rem;font-weight:600;border:none;background:transparent;color:var(--text-muted);cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:6px}.stage-btn.active{background:#fff;color:var(--primary);box-shadow:var(--shadow-sm)}.search-wrapper{flex:1;max-width:460px;position:relative}.search-input{width:100%;padding:9px 16px 9px 40px;background:#f8fafc;border:1px solid var(--border);border-radius:var(--radius-full);font-size:.875rem;color:var(--text-main);transition:var(--transition)}.search-input:focus{outline:none;background:#fff;border-color:var(--border-focus);box-shadow:0 0 0 3px #6366f126}.search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-light);pointer-events:none}.header-actions{display:flex;align-items:center;gap:.75rem}.btn-upload{display:flex;align-items:center;gap:6px;background:linear-gradient(135deg,#4f46e5,#6366f1);color:#fff;border:none;padding:8px 18px;border-radius:var(--radius-full);font-size:.875rem;font-weight:600;cursor:pointer;transition:var(--transition);box-shadow:0 2px 8px #4f46e540}.btn-upload:hover{transform:translateY(-1px);box-shadow:0 4px 12px #4f46e559}.points-pill{display:flex;align-items:center;gap:6px;background:#fffbeb;border:1px solid #fde68a;color:#b45309;padding:6px 14px;border-radius:var(--radius-full);font-size:.825rem;font-weight:700;cursor:pointer;transition:var(--transition)}.points-pill:hover{background:#fef3c7;transform:scale(1.02)}.user-avatar-btn{width:38px;height:38px;border-radius:50%;border:2px solid white;box-shadow:var(--shadow-sm);cursor:pointer;overflow:hidden;position:relative}.user-avatar-btn img{width:100%;height:100%;object-fit:cover}.main-content{max-width:1380px;margin:0 auto;padding:1.5rem;flex:1;width:100%}.hero-banner{background:linear-gradient(135deg,#1e1b4b,#312e81 60%,#4338ca);border-radius:var(--radius-lg);padding:2.2rem 2.5rem;color:#fff;margin-bottom:1.5rem;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}.hero-banner:after{content:"";position:absolute;right:-50px;top:-50px;width:300px;height:300px;background:radial-gradient(circle,#8b5cf64d,#fff0 70%);pointer-events:none}.hero-tag{display:inline-flex;align-items:center;gap:6px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:1px;background:#ffffff26;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);padding:4px 12px;border-radius:var(--radius-full);margin-bottom:.75rem}.hero-title{font-family:Outfit,sans-serif;font-size:2rem;font-weight:800;line-height:1.2;margin-bottom:.75rem}.hero-desc{font-size:.95rem;color:#c7d2fe;max-width:650px;margin-bottom:1.2rem}.hero-hot-tags{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}.hot-label{font-size:.8rem;color:#a5b4fc}.hot-chip{font-size:.75rem;background:#ffffff1f;border:1px solid rgba(255,255,255,.2);color:#fff;padding:3px 10px;border-radius:var(--radius-full);cursor:pointer;transition:var(--transition)}.hot-chip:hover{background:#ffffff40;transform:translateY(-1px)}.filter-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem 1.5rem;margin-bottom:1.5rem;box-shadow:var(--shadow-sm)}.filter-row{display:flex;align-items:flex-start;padding:.55rem 0;border-bottom:1px dashed #f1f5f9}.filter-row:last-child{border-bottom:none;padding-bottom:0}.filter-row:first-child{padding-top:0}.filter-label{width:75px;font-size:.825rem;font-weight:700;color:var(--text-muted);padding-top:4px;flex-shrink:0}.filter-options{display:flex;flex-wrap:wrap;gap:.4rem;flex:1}.filter-chip{font-size:.825rem;padding:4px 12px;border-radius:var(--radius-sm);background:#f8fafc;color:var(--text-main);border:1px solid transparent;cursor:pointer;transition:var(--transition)}.filter-chip:hover{background:#f1f5f9;color:var(--primary)}.filter-chip.active{background:var(--primary-light);color:var(--primary);font-weight:700;border-color:#c7d2fe}.results-bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.2rem}.results-count{font-size:.9rem;color:var(--text-muted)}.results-count b{color:var(--primary)}.sort-group{display:flex;align-items:center;gap:.5rem}.sort-btn{font-size:.825rem;padding:4px 12px;border-radius:var(--radius-full);border:1px solid var(--border);background:#fff;color:var(--text-muted);cursor:pointer;transition:var(--transition)}.sort-btn.active{background:var(--text-main);color:#fff;border-color:var(--text-main);font-weight:600}.papers-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.25rem;margin-bottom:2rem}.paper-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);padding:1.25rem;display:flex;flex-direction:column;justify-content:space-between;transition:var(--transition);cursor:pointer;position:relative;overflow:hidden}.paper-card:hover{transform:translateY(-3px);border-color:#cbd5e1;box-shadow:var(--shadow-lg)}.card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.tag-badges{display:flex;align-items:center;gap:.4rem}.badge-stage{font-size:.7rem;font-weight:700;padding:2px 7px;border-radius:var(--radius-sm);background:#e0e7ff;color:#3730a3}.badge-type{font-size:.7rem;font-weight:600;padding:2px 7px;border-radius:var(--radius-sm);background:#f1f5f9;color:#475569}.format-badge{display:flex;align-items:center;gap:3px;font-size:.7rem;font-weight:800;padding:2px 8px;border-radius:var(--radius-full)}.format-pdf{background:#fef2f2;color:#dc2626;border:1px solid #fecaca}.format-word{background:#eff6ff;color:#2563eb;border:1px solid #bfdbfe}.format-image{background:#f0fdf4;color:#16a34a;border:1px solid #bbf7d0}.card-title{font-size:1rem;font-weight:700;line-height:1.4;color:var(--text-main);margin-bottom:.5rem;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-meta{display:flex;align-items:center;gap:.75rem;font-size:.8rem;color:var(--text-muted);margin-bottom:.75rem}.card-answer-status{margin-bottom:1rem}.badge-answer-full{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:600;color:#059669;background:#ecfdf5;padding:3px 8px;border-radius:var(--radius-sm)}.badge-answer-part{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:600;color:#0284c7;background:#f0f9ff;padding:3px 8px;border-radius:var(--radius-sm)}.badge-answer-none{display:inline-flex;align-items:center;gap:4px;font-size:.75rem;font-weight:600;color:#64748b;background:#f1f5f9;padding:3px 8px;border-radius:var(--radius-sm)}.card-bottom{display:flex;align-items:center;justify-content:space-between;border-top:1px solid #f1f5f9;padding-top:.75rem;margin-top:auto}.card-stats{display:flex;align-items:center;gap:.75rem;font-size:.75rem;color:var(--text-light)}.card-stat-item{display:flex;align-items:center;gap:3px}.card-action-btn{display:flex;align-items:center;gap:4px;background:var(--primary-light);color:var(--primary);border:none;font-size:.8rem;font-weight:700;padding:5px 12px;border-radius:var(--radius-full);cursor:pointer;transition:var(--transition)}.card-action-btn:hover{background:var(--primary);color:#fff}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0f172aa6;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:100;display:flex;align-items:center;justify-content:center;padding:1.5rem;animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-container{background:#fff;border-radius:var(--radius-lg);width:100%;max-width:960px;max-height:90vh;display:flex;flex-direction:column;overflow:hidden;box-shadow:var(--shadow-xl)}.modal-header{padding:1.25rem 1.5rem;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;background:#f8fafc}.modal-title{font-size:1.15rem;font-weight:700;color:var(--text-main)}.modal-close-btn{background:transparent;border:none;color:var(--text-muted);cursor:pointer;padding:4px;border-radius:var(--radius-sm);transition:var(--transition)}.modal-close-btn:hover{background:#e2e8f0;color:var(--text-main)}.modal-body{padding:1.5rem;overflow-y:auto;flex:1}.preview-tabs{display:flex;background:#f1f5f9;padding:4px;border-radius:var(--radius-md);margin-bottom:1rem}.preview-tab{flex:1;text-align:center;padding:8px;font-size:.875rem;font-weight:600;border-radius:var(--radius-sm);border:none;background:transparent;color:var(--text-muted);cursor:pointer;transition:var(--transition)}.preview-tab.active{background:#fff;color:var(--primary);box-shadow:var(--shadow-sm)}.preview-viewport{background:#1e293b;border-radius:var(--radius-md);min-height:420px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;padding:1rem}.preview-image{max-width:100%;max-height:520px;object-fit:contain;border-radius:var(--radius-sm);box-shadow:var(--shadow-lg)}.watermark-layer{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;display:flex;align-items:center;justify-content:center;transform:rotate(-30deg);opacity:.12;font-size:2.5rem;font-weight:900;color:#fff;-webkit-user-select:none;user-select:none}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-bottom:1.25rem}.form-group{display:flex;flex-direction:column;gap:.4rem}.form-group.full-width{grid-column:span 2}.form-label{font-size:.825rem;font-weight:700;color:var(--text-main)}.form-input,.form-select,.form-textarea{padding:9px 12px;border-radius:var(--radius-sm);border:1px solid var(--border);font-size:.875rem;background:#f8fafc;transition:var(--transition);font-family:inherit}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;background:#fff;border-color:var(--border-focus);box-shadow:0 0 0 3px #6366f126}.dropzone{border:2px dashed #cbd5e1;border-radius:var(--radius-md);padding:1.5rem;text-align:center;background:#f8fafc;cursor:pointer;transition:var(--transition)}.dropzone:hover{border-color:var(--primary);background:var(--primary-light)}.dropzone-icon{color:var(--primary);margin-bottom:.5rem}.app-footer{background:#fff;border-top:1px solid var(--border);padding:2rem 1.5rem;margin-top:auto;text-align:center;color:var(--text-muted);font-size:.85rem}.footer-links{display:flex;justify-content:center;gap:1.5rem;margin-bottom:.75rem}.footer-link{color:var(--text-muted);text-decoration:none;cursor:pointer}.footer-link:hover{color:var(--primary)}@media (max-width: 768px){.header-content{flex-wrap:wrap;gap:.75rem}.search-wrapper{order:3;max-width:100%;width:100%}.form-grid{grid-template-columns:1fr}.form-group.full-width{grid-column:span 1}.hero-title{font-size:1.5rem}}