.home{width:100%;min-height:100vh;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}.hero{height:350px;background:linear-gradient(135deg,#667eea1a,#764ba21a);border:2px solid rgba(102,126,234,.3);margin:40px;border-radius:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 10px 30px #667eea33;transition:transform .3s ease}.hero:hover{transform:translateY(-5px)}.hero-title{font-size:56px;margin-bottom:25px;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-weight:800;letter-spacing:3px}.hero-btn{padding:12px 35px;border:2px solid #667eea;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:1.1rem;font-weight:600;cursor:pointer;border-radius:30px;transition:all .3s ease;box-shadow:0 4px 15px #667eea66}.hero-btn:hover{transform:translateY(-3px) scale(1.05);box-shadow:0 6px 20px #667eea99}.hero-btn:active{transform:translateY(-1px) scale(1.02)}.about{padding:0 40px 60px;max-width:1200px;margin:0 auto}.about-title{font-size:28px;margin:50px 0 40px;color:#333;font-weight:700;text-align:center}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}.card{border:1px solid #e0e0e0;border-radius:15px;padding:35px;min-height:140px;background:#fff;transition:all .3s ease;box-shadow:0 4px 6px #0000000d;cursor:pointer}.card:hover{transform:translateY(-8px);box-shadow:0 12px 24px #667eea33;border-color:#667eea}.card h3{margin-bottom:12px;font-size:20px;color:#333;font-weight:600}.card p{color:#666;font-size:15px;line-height:1.6}@media(max-width:1024px){.card-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:768px){.hero{margin:20px;height:280px}.hero-title{font-size:40px}.hero-btn{padding:10px 28px;font-size:1rem}.card-grid{grid-template-columns:1fr;gap:20px}.about{padding:0 20px 40px}.card{padding:25px}}.modal-content{background:#fff;border-radius:12px;padding:32px;max-width:600px;width:90%;max-height:80vh;overflow-y:auto;box-shadow:0 20px 60px #0000004d;animation:slideIn .3s ease;position:relative}.modal-close{position:absolute;top:16px;right:16px;background:#f5f5f5;border:none;border-radius:50%;width:32px;height:32px;font-size:24px;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#666;transition:all .2s ease}.modal-close:hover{background:#e0e0e0;color:#333}.modal-body{color:#333;line-height:1.8}.modal-body h2{font-size:24px;font-weight:600;color:#1a1a2e;margin-bottom:20px}.modal-body p{margin-bottom:16px}.modal-body hr{border:none;border-top:1px solid #e0e0e0;margin:20px 0}@media(max-width:640px){.modal-content{padding:24px;max-height:85vh}.modal-body h2{font-size:20px}}.feature-tip-modal-mask{position:fixed;top:0;left:0;width:100vw;height:100vh;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:9999}.feature-tip-modal{width:500px;max-width:90vw;background:#fff;border-radius:8px;box-shadow:0 2px 12px #0000001a;overflow:hidden}.modal-header{padding:16px 20px;border-bottom:1px solid #eee;display:flex;justify-content:space-between;align-items:center}.modal-header h3{margin:0;font-size:18px;color:#333}.close-btn{background:transparent;border:none;font-size:20px;color:#999;cursor:pointer;padding:0;width:30px;height:30px;line-height:30px;text-align:center}.close-btn:hover{color:#666}.modal-content{padding:20px}.feature-section,.note-section{margin-bottom:16px}.feature-section h4,.note-section h4{margin:0 0 8px;font-size:16px;color:#444}.feature-section ul,.note-section ul{margin:0;padding-left:20px;color:#666;line-height:1.6}.note-section{color:#f56c6c}.modal-footer{padding:12px 20px;border-top:1px solid #eee;text-align:right}.confirm-btn{background:#409eff;color:#fff;border:none;border-radius:4px;padding:6px 16px;font-size:14px;cursor:pointer}.confirm-btn:hover{background:#66b1ff}.login-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}.login-box{background:#fff;padding:2rem;border-radius:10px;box-shadow:0 10px 25px #0003;width:100%;max-width:400px}.login-box h2{text-align:center;color:#333;margin-bottom:1.5rem}.form-group{margin-bottom:1rem}.form-group input{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:5px;font-size:1rem;transition:border-color .3s}.form-group input:focus{outline:none;border-color:#667eea}.submit-btn{width:100%;padding:.75rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:5px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s}.submit-btn:hover{transform:translateY(-2px);box-shadow:0 5px 15px #667eea66}.message{text-align:center;margin-top:1rem;padding:.5rem;border-radius:5px;font-size:.9rem}.toggle-text{text-align:center;margin-top:1rem;color:#666}.toggle-text button{background:none;border:none;color:#667eea;font-weight:600;cursor:pointer;margin-left:.5rem;padding:0}.toggle-text button:hover{text-decoration:underline}.ask-container{min-height:100vh;background-color:#f5f7fa;padding:120px 20px 40px}.ask-content{max-width:560px;margin:0 auto}.ask-title{font-size:32px;font-weight:700;color:#1e293b;text-align:center;margin-bottom:40px}.ask-form{background:#fff;padding:40px;border-radius:12px;box-shadow:0 4px 6px -1px #0000001a}.form-group{margin-bottom:24px}.form-label:before{content:"*";color:#dc2626;margin-right:4px}.form-select,.form-input,.form-textarea{width:100%;padding:12px 16px;border:1px solid #E2E8F0;border-radius:8px;background-color:#f8fafc;font-size:16px;color:#1e293b;font-family:inherit;transition:all .2s ease}.form-select:focus,.form-input:focus,.form-textarea:focus{outline:none;border-color:#2563eb;background-color:#fff;box-shadow:0 0 0 3px #2563eb1a}.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center;background-size:16px;cursor:pointer}.form-textarea{min-height:160px;resize:vertical;line-height:1.6}.submit-btn{width:120px;height:40px;background-color:#2563eb;color:#fff;font-size:16px;font-weight:600;border:none;border-radius:8px;cursor:pointer;transition:all .2s ease;margin-top:16px}.submit-btn:hover{background-color:#1d4ed8;transform:translateY(-2px);box-shadow:0 4px 12px #2563eb4d}@media(max-width:640px){.ask-content{padding:0 16px}.ask-form{padding:24px}.ask-title{font-size:24px}}.browse-container{min-height:100vh;background-color:#f5f7fa;padding:120px 20px 40px;max-width:900px;margin:0 auto}.browse-header{display:flex;justify-content:center;align-items:center;gap:12px;margin-bottom:32px}.filter-label{font-size:14px;color:#6b7280}.filter-select{height:36px;padding:0 32px 0 12px;border:1px solid #D1D5DB;border-radius:6px;background-color:#fff;font-size:14px;color:#1f2937;cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:16px}.filter-select:focus{outline:none;border-color:#93c5fd;box-shadow:0 0 0 3px #93c5fd4d}.questions-list{display:flex;flex-direction:column;gap:20px}.question-card{background:#fff;padding:24px;border-radius:8px;box-shadow:0 4px 6px -1px #0000000d;transition:all .2s ease}.question-card:hover{box-shadow:0 8px 12px -1px #0000001a;transform:translateY(-2px)}.question-header{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:8px}.question-title{font-size:16px;font-weight:600;color:#1f2937;line-height:1.5;flex:1}.question-tags-inline{display:flex;flex-wrap:wrap;gap:6px;flex-shrink:0}.question-summary{font-size:14px;color:#6b7280;line-height:1.6;margin-bottom:16px}.question-meta{display:flex;justify-content:space-between;align-items:center;padding:12px;background:#f8fafc;border-radius:6px;margin-bottom:16px;border:1px solid #E2E8F0}.question-actions{display:flex;justify-content:flex-end;align-items:center;gap:12px}.action-icon{font-size:20px;cursor:pointer;opacity:.7;transition:opacity .2s ease}@media(max-width:640px){.browse-container{padding:100px 16px 32px}.question-card{padding:20px}.pagination{gap:4px}.page-btn{width:32px;height:32px;font-size:13px}}.match-container{min-height:100vh;background-color:#f5f7fa;padding:120px 20px 40px;display:flex;justify-content:center;align-items:flex-start}.match-content{width:100%;max-width:560px}.match-title{font-size:32px;font-weight:700;color:#1e293b;text-align:center;margin-bottom:40px}.match-form{background:#fff;padding:40px;border-radius:12px;box-shadow:0 4px 6px -1px #0000001a}.form-row{margin-bottom:24px}.form-label{display:block;font-size:14px;font-weight:500;color:#1e293b;margin-bottom:8px}.form-input,.form-select{width:100%;padding:12px 16px;border:1px solid #E2E8F0;border-radius:8px;background-color:#f8fafc;font-size:16px;color:#1e293b;font-family:inherit;transition:all .2s ease}.form-input:focus,.form-select:focus{outline:none;border-color:#2563eb;background-color:#fff;box-shadow:0 0 0 3px #2563eb1a}.form-select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center;background-size:16px;cursor:pointer;padding-right:32px}.submit-btn{width:100%;height:44px;background-color:#1e293b;color:#fff;font-size:16px;font-weight:600;border:none;border-radius:8px;cursor:pointer;transition:all .2s ease;margin-top:16px}.submit-btn:hover{background-color:#0f172a;transform:translateY(-2px);box-shadow:0 4px 12px #0003}.submit-btn:active{transform:translateY(0)}.message{text-align:center;padding:12px;border-radius:6px;font-size:14px;margin-bottom:16px}.message:empty{display:none}.back-btn{padding:10px 20px;background:#fff;border:1px solid #E2E8F0;border-radius:8px;cursor:pointer;font-size:14px;color:#64748b;margin-bottom:24px;transition:all .2s ease}.back-btn:hover{background:#f8fafc;border-color:#cbd5e1}.users-list{display:flex;flex-direction:column;gap:16px}.user-card{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px -1px #0000000d;display:flex;justify-content:space-between;align-items:center;transition:all .2s ease}.user-card:hover{box-shadow:0 4px 8px -1px #0000001a;transform:translateY(-2px)}.user-info{flex:1}.user-name{font-size:18px;font-weight:600;color:#1e293b;margin-bottom:0}.select-btn{padding:8px 16px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:14px;font-weight:500;border:none;border-radius:6px;cursor:pointer;transition:all .2s ease}.select-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}.pair-info{font-size:14px;color:#64748b;margin-top:8px}.enter-dialogue-btn{margin-top:16px;padding:12px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:14px;font-weight:600;border:none;border-radius:6px;cursor:pointer;transition:all .2s ease}.enter-dialogue-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}.questions-list{display:flex;flex-direction:column;gap:16px}.question-card{background:#fff;padding:20px;border-radius:8px;box-shadow:0 2px 4px -1px #0000000d;transition:all .2s ease}.question-card:hover{box-shadow:0 4px 8px -1px #0000001a;transform:translateY(-2px)}.question-content{margin-bottom:16px}.question-title{font-size:16px;font-weight:600;color:#1e293b;margin-bottom:0}.question-actions{display:flex;justify-content:space-between;align-items:center;gap:12px}.expand-icon{font-size:16px;color:#64748b;background:none;border:none;cursor:pointer;padding:8px;transition:all .2s ease;display:flex;align-items:center;justify-content:center;min-width:32px}.expand-icon:hover{color:#2563eb;background-color:#f8fafc;border-radius:4px}.question-expanded-content{margin-top:16px;padding-top:16px;border-top:1px solid #E2E8F0}.question-content-text{font-size:14px;color:#475569;line-height:1.6;margin:0;white-space:pre-wrap;word-wrap:break-word}.empty{text-align:center;padding:40px;color:#64748b;font-size:14px}@media(max-width:640px){.match-container{padding:100px 16px 32px}.match-form{padding:24px}}.online-indicator{position:absolute;top:8px;right:8px;z-index:10}.online-dot{width:10px;height:10px;border-radius:50%;display:inline-block}.online-dot.online{background-color:#10b981;box-shadow:0 0 0 2px #10b98133;animation:pulse-online 2s infinite}.online-dot.offline{background-color:#ef4444;box-shadow:0 0 0 2px #ef444433}@keyframes pulse-online{0%,to{opacity:1}50%{opacity:.7}}.online-legend{display:flex;gap:20px;margin-left:16px;align-items:center}.legend-item{display:flex;align-items:center;gap:6px}.legend-dot{width:10px;height:10px;border-radius:50%;display:inline-block}.legend-dot.online{background-color:#10b981;box-shadow:0 0 0 2px #10b98133}.legend-dot.offline{background-color:#ef4444;box-shadow:0 0 0 2px #ef444433}.legend-text{font-size:12px;color:#64748b;font-weight:500}.user-card{position:relative}.question-content-text{font-size:14px;color:#475569;line-height:1.6;margin:12px 0 0;white-space:pre-wrap;word-wrap:break-word}.question-actions{margin-top:16px;justify-content:flex-end}.personal-container{min-height:100vh;background-color:#f5f7fa;padding:120px 20px 40px;max-width:1200px;margin:0 auto}.personal-header{margin-bottom:32px;padding-bottom:16px;border-bottom:1px solid #E5E7EB}.breadcrumb-text{font-size:20px;font-weight:600;color:#1f2937}.personal-content-wrapper{display:flex;gap:24px;align-items:flex-start}.personal-sidebar{width:200px;flex-shrink:0;background:#fff;border-radius:8px;box-shadow:0 4px 6px -1px #0000000d;padding:16px;position:sticky;top:120px}.sidebar-nav{display:flex;flex-direction:column;gap:8px}.sidebar-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border:none;background:transparent;border-radius:6px;cursor:pointer;transition:all .2s ease;width:100%;text-align:left;font-size:15px;color:#6b7280}.sidebar-item:hover{background:#f3f4f6;color:#374151}.sidebar-item.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.sidebar-icon{font-size:18px;flex-shrink:0}.sidebar-text{font-weight:500}.personal-content{flex:1;min-width:0}.profile-section{background:#fff;border-radius:8px;box-shadow:0 4px 6px -1px #0000000d;padding:40px}.profile-loading,.profile-error,.profile-empty{text-align:center;padding:60px 20px}.loading-spinner{border:3px solid #E5E7EB;border-top:3px solid #3B82F6;border-radius:50%;width:40px;height:40px;animation:spin .8s linear infinite;margin:0 auto 16px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.profile-loading p,.profile-error p,.profile-empty p{color:#6b7280;font-size:16px}.profile-error p{color:#ef4444}.profile-header{display:flex;gap:24px;padding-bottom:32px;border-bottom:1px solid #E5E7EB;margin-bottom:32px}.profile-section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:32px;padding-bottom:16px;border-bottom:1px solid #E5E7EB}.profile-section-title{font-size:20px;font-weight:600;color:#1f2937;margin:0}.profile-section-edit-btn{padding:8px 16px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease;white-space:nowrap}.profile-section-edit-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}.profile-section-edit-btn:active{transform:translateY(0)}.multi-select-dropdown{position:relative;width:100%}.dropdown-trigger{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;border:1px solid #D1D5DB;border-radius:6px;background:#fff;cursor:pointer;transition:all .2s ease;min-height:44px}.dropdown-trigger:hover{border-color:#9ca3af}.dropdown-trigger.open{border-color:#3b82f6;box-shadow:0 0 0 3px #3b82f61a}.dropdown-selected-tags{display:flex;flex-wrap:wrap;gap:6px;flex:1;min-width:0}.dropdown-placeholder{color:#9ca3af;font-size:14px}.selected-tag{display:inline-flex;align-items:center;gap:4px;padding:4px 8px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:12px;font-weight:500;border-radius:4px;white-space:nowrap}.selected-tag-remove{display:flex;align-items:center;justify-content:center;width:16px;height:16px;border:none;background:#fff3;color:#fff;border-radius:50%;font-size:12px;line-height:1;cursor:pointer;transition:all .2s ease;padding:0}.selected-tag-remove:hover:not(:disabled){background:#ffffff4d}.selected-tag-remove:disabled{opacity:.5;cursor:not-allowed}.selected-tag-more{padding:4px 8px;background:#f3f4f6;color:#6b7280;font-size:12px;font-weight:500;border-radius:4px}.dropdown-arrow{color:#6b7280;font-size:12px;margin-left:8px;transition:transform .2s ease;flex-shrink:0}.dropdown-trigger.open .dropdown-arrow{transform:rotate(180deg)}.dropdown-options{position:absolute;top:calc(100% + 4px);left:0;right:0;background:#fff;border:1px solid #E5E7EB;border-radius:6px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f;max-height:240px;overflow-y:auto;z-index:10}.dropdown-option{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;cursor:pointer;transition:all .2s ease;font-size:14px;color:#374151}.dropdown-option:hover{background:#f3f4f6}.dropdown-option.selected{background:#eff6ff;color:#1d4ed8}.dropdown-option-empty{padding:12px;text-align:center;color:#9ca3af;font-size:14px}.option-name{flex:1}.option-checkmark{color:#3b82f6;font-weight:600;margin-left:8px}.profile-avatar{flex-shrink:0;width:100px;height:100px;border-radius:50%;overflow:hidden;background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 4px 12px #667eea4d}.profile-avatar-img{width:100%;height:100%;object-fit:cover}.profile-avatar-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center}.avatar-emoji{font-size:48px;font-weight:600;color:#fff}.profile-info{flex:1;min-width:0}.profile-nickname{font-size:24px;font-weight:600;color:#1f2937;margin:0 0 8px;word-wrap:break-word}.profile-username{font-size:14px;color:#6b7280;margin:0 0 12px;font-weight:500}.profile-bio{font-size:14px;color:#4b5563;line-height:1.6;margin:0;word-wrap:break-word}.preferences-section{margin-bottom:32px}.preferences-section:last-child{margin-bottom:0}.preference-title{font-size:16px;font-weight:600;color:#1f2937;margin:0 0 16px;padding-bottom:8px;border-bottom:2px solid #E5E7EB}.preferences-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}.preference-column{background:#f8fafc;border-radius:8px;padding:20px;border:1px solid #E2E8F0}.topic-list{list-style:none;padding:0;margin:0}.topic-item{display:flex;align-items:center;gap:8px;padding:10px 0;color:#4b5563;font-size:14px;border-bottom:1px solid #E5E7EB}.topic-item:last-child{border-bottom:none}.topic-icon{font-size:18px;flex-shrink:0}.topic-empty{color:#9ca3af;font-size:14px;margin:0;text-align:center;padding:20px 0}.difficulty-tags{display:flex;flex-wrap:wrap;gap:12px}.difficulty-tag{padding:8px 16px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:14px;font-weight:500;border-radius:20px;white-space:nowrap;transition:all .2s ease}.difficulty-tag:hover{transform:translateY(-2px);box-shadow:0 4px 12px #667eea4d}@media(max-width:768px){.profile-section{padding:24px}.profile-header{flex-direction:column;align-items:center;text-align:center}.profile-avatar{width:80px;height:80px}.avatar-emoji{font-size:36px}.profile-nickname{font-size:20px}.preferences-grid{grid-template-columns:1fr;gap:16px}.difficulty-tags{gap:8px}.difficulty-tag{font-size:13px;padding:6px 12px}}@media(max-width:480px){.profile-section{padding:20px}.profile-header{gap:16px;padding-bottom:24px;margin-bottom:24px}.profile-avatar{width:64px;height:64px}.avatar-emoji{font-size:28px}.profile-nickname{font-size:18px}.profile-username,.profile-bio{font-size:13px}.preference-column{padding:16px}.topic-item{font-size:13px}}.history-section{display:flex;flex-direction:column}.history-list{display:flex;flex-direction:column;gap:20px}.history-section-title{font-size:18px;font-weight:600;color:#1f2937;margin:32px 0 16px;padding-bottom:8px;border-bottom:2px solid #E5E7EB}.history-section-title:first-child{margin-top:0}.loading,.empty{text-align:center;padding:60px 20px;color:#6b7280;font-size:16px}.history-card{background:#fff;padding:24px;border-radius:8px;box-shadow:0 4px 6px -1px #0000000d;transition:all .2s ease}.history-card:hover{box-shadow:0 8px 12px -1px #0000001a;transform:translateY(-2px)}.history-header{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:8px}.history-title{font-size:16px;font-weight:600;color:#1f2937;line-height:1.5;flex:1}.history-tags-inline{display:flex;flex-wrap:wrap;gap:6px;flex-shrink:0}.tag-small{padding:4px 10px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:11px;font-weight:500;border-radius:12px;white-space:nowrap}.history-summary{font-size:14px;color:#6b7280;line-height:1.6;margin-bottom:16px}.history-meta{display:flex;justify-content:space-between;align-items:center;padding:12px;background:#f8fafc;border-radius:6px;margin-bottom:16px;border:1px solid #E2E8F0}.meta-item{font-size:12px;color:#64748b;font-weight:500}.history-actions{display:flex;justify-content:space-between;align-items:center}.view-details{font-size:14px;font-weight:500;color:#1d4ed8;text-decoration:none;transition:all .2s ease}.view-details:hover{color:#2563eb;text-decoration:underline}.delete-question-btn{font-size:14px;font-weight:500;color:#ef4444;cursor:pointer;border:none;background:transparent;padding:0;transition:all .2s ease}.delete-question-btn:hover{color:#dc2626;text-decoration:underline}.delete-question-btn:active{transform:scale(.98)}.pagination{display:flex;justify-content:center;align-items:center;gap:8px;margin-top:40px}.page-btn{width:36px;height:36px;border:1px solid #D1D5DB;border-radius:4px;background:#fff;color:#4b5563;font-size:14px;cursor:pointer;transition:all .2s ease}.page-btn:hover:not(:disabled){background:#f3f4f6}.page-btn.active{background:#3b82f6;color:#fff;border-color:#2563eb}.page-btn:disabled{opacity:.5;cursor:not-allowed}.notifications-section{background:#fff;border-radius:8px;box-shadow:0 4px 6px -1px #0000000d;overflow:hidden}.notification-section{margin-bottom:0}.notification-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid #E5E7EB}.notification-icon-wrapper{display:flex;align-items:center;gap:8px}.notification-bell{font-size:20px}.notification-badge{background:#ef4444;color:#fff;font-size:12px;font-weight:600;padding:2px 6px;border-radius:10px;min-width:18px;text-align:center}.notification-toggle-btn{font-size:14px;font-weight:500;color:#6b7280;background:transparent;border:1px solid #D1D5DB;border-radius:6px;padding:6px 12px;cursor:pointer;transition:all .2s ease}.notification-toggle-btn:hover{background:#f3f4f6;color:#374151}.notification-list{max-height:500px;overflow-y:auto}.notification-loading,.notification-empty{text-align:center;padding:20px;color:#6b7280;font-size:14px}.notification-item{border:2px solid #E5E7EB;border-radius:8px;padding:16px 20px;margin:12px;background:#fff;display:flex;justify-content:space-between;align-items:flex-start;gap:16px;animation:slideIn .3s ease}.notification-item.pair-application{background:#ecf5ff;border:1px solid #409EFF}.notification-item.pair-application .notification-title{color:#409eff}.notification-item.notification-pair-accepted{background:#f0f9ff;border:1px solid #67c23a}.notification-item.notification-pair-accepted .notification-title{color:#67c23a}.notification-item.end-request{border:2px solid #EF4444;background:#fef2f2}.notification-item.end-request .notification-title{color:#dc2626}.notification-item.notification-processed{border:1px solid #9CA3AF;background:#f9fafb}.notification-item.notification-processed .notification-title{color:#6b7280}@keyframes slideIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.notification-content{flex:1}.notification-title{font-size:16px;font-weight:600;color:#dc2626;margin-bottom:8px}.notification-question-info{margin-top:8px}.notification-question-title{font-size:14px;font-weight:500;color:#374151;margin-bottom:4px}.notification-question-content{font-size:13px;color:#6b7280;line-height:1.5}.notification-actions{display:flex;flex-direction:column;gap:8px;flex-shrink:0}.notification-btn{padding:8px 16px;border:none;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease;white-space:nowrap}.notification-btn-reject{background:#f3f4f6;color:#6b7280}.notification-btn-reject:hover{background:#e5e7eb;color:#374151}.notification-btn-accept{background:#ef4444;color:#fff}.notification-btn-accept:hover{background:#dc2626}.notification-btn-primary{background:#20c997;color:#fff}.notification-btn-primary:hover{background:#1aa87f}.notification-btn-know{background:#fff;color:#333;border:1px solid #ddd}.notification-btn-know:hover{background:#f5f5f5}.notification-actions-vertical{display:flex;flex-direction:column;gap:8px}.notification-btn:active{transform:scale(.98)}@media(max-width:768px){.personal-container{padding:100px 16px 32px}.personal-content-wrapper{flex-direction:column}.personal-sidebar{width:100%;position:static}.sidebar-nav{flex-direction:row;gap:12px}.sidebar-item{flex:1;justify-content:center}.history-card{padding:20px}.pagination{gap:4px}.page-btn{width:32px;height:32px;font-size:13px}.notification-item{flex-direction:column}.notification-actions{flex-direction:row;width:100%}.notification-btn{flex:1}}@media(max-width:480px){.personal-container{padding:90px 12px 24px}.personal-header{margin-bottom:24px}.breadcrumb-text{font-size:18px}.sidebar-nav{gap:8px}.sidebar-item{padding:10px 12px;font-size:14px}.sidebar-icon{font-size:16px}.history-card{padding:16px}.history-header{flex-direction:column;gap:8px}.history-tags-inline{width:100%}.tag-small{font-size:10px;padding:3px 8px}}.edit-btn{padding:8px 16px;background:transparent;color:#3b82f6;border:1px solid #3B82F6;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease;white-space:nowrap}.edit-btn:hover{background:#3b82f6;color:#fff}.edit-btn:active{transform:scale(.98)}.preferences-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.preferences-header .preference-title{margin:0;padding:0;border:none}.preference-subtitle{font-size:14px;font-weight:600;color:#4b5563;margin:0 0 12px}.profile-edit-modal-mask{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.profile-edit-modal{background:#fff;border-radius:12px;box-shadow:0 20px 25px -5px #0000001a,0 10px 10px -5px #0000000a;width:100%;max-width:600px;max-height:90vh;overflow:hidden;display:flex;flex-direction:column}.profile-edit-modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid #E5E7EB}.profile-edit-modal-title{font-size:18px;font-weight:600;color:#1f2937;margin:0}.profile-edit-modal-close{background:transparent;border:none;font-size:28px;color:#6b7280;cursor:pointer;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:4px;transition:all .2s ease;padding:0;line-height:1}.profile-edit-modal-close:hover:not(:disabled){background:#f3f4f6;color:#374151}.profile-edit-modal-close:disabled{opacity:.5;cursor:not-allowed}.profile-edit-modal-body{padding:24px;overflow-y:auto;flex:1}.modal-loading{text-align:center;padding:60px 20px;color:#6b7280;font-size:16px}.profile-form-section{margin-bottom:24px}.profile-form-section:last-child{margin-bottom:0}.profile-form-section-title{font-size:15px;font-weight:600;color:#1f2937;margin:0 0 16px;padding-bottom:8px;border-bottom:2px solid #E5E7EB}.profile-form-item{margin-bottom:16px}.profile-form-item:last-child{margin-bottom:0}.profile-form-label{display:block;font-size:14px;font-weight:500;color:#374151;margin-bottom:8px}.profile-form-input,.profile-form-textarea,.profile-form-select{width:100%;padding:10px 12px;border:1px solid #D1D5DB;border-radius:6px;font-size:14px;color:#1f2937;background:#fff;transition:all .2s ease;font-family:inherit}.profile-form-input:focus,.profile-form-textarea:focus,.profile-form-select:focus{outline:none;border-color:#3b82f6;box-shadow:0 0 0 3px #3b82f61a}.profile-form-input:disabled,.profile-form-textarea:disabled,.profile-form-select:disabled{background:#f9fafb;cursor:not-allowed}.profile-form-textarea{resize:vertical;min-height:80px}.profile-form-select{height:auto;min-height:120px}.profile-form-hint{font-size:12px;color:#6b7280;margin:6px 0 0}.profile-form-checkbox-group{display:flex;flex-wrap:wrap;gap:12px}.profile-form-checkbox-label{display:flex;align-items:center;gap:8px;padding:8px 12px;background:#f8fafc;border:1px solid #E2E8F0;border-radius:6px;cursor:pointer;transition:all .2s ease;font-size:14px;color:#4b5563;font-weight:500}.profile-form-checkbox-label:hover{background:#f1f5f9;border-color:#cbd5e1}.profile-form-checkbox-label input[type=checkbox]{width:16px;height:16px;cursor:pointer;accent-color:#3B82F6}.profile-form-checkbox-label input[type=checkbox]:disabled{cursor:not-allowed}.profile-form-checkbox-label:has(input[type=checkbox]:disabled){opacity:.6;cursor:not-allowed}.profile-edit-modal-footer{display:flex;justify-content:flex-end;gap:12px;padding:16px 24px;border-top:1px solid #E5E7EB;background:#f9fafb}.profile-modal-btn{padding:10px 20px;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease;border:1px solid transparent}.profile-modal-btn:disabled{opacity:.5;cursor:not-allowed}.profile-modal-btn-cancel{background:#fff;color:#6b7280;border-color:#d1d5db}.profile-modal-btn-cancel:hover:not(:disabled){background:#f3f4f6;color:#374151}.profile-modal-btn-save{background:#3b82f6;color:#fff;border-color:#2563eb}.profile-modal-btn-save:hover:not(:disabled){background:#2563eb;border-color:#1d4ed8}.profile-modal-btn-save:active:not(:disabled){transform:scale(.98)}@media(max-width:768px){.profile-edit-modal-mask{padding:16px}.profile-edit-modal{max-width:100%;max-height:95vh}.profile-edit-modal-header{padding:16px 20px}.profile-edit-modal-body{padding:20px}.profile-edit-modal-footer{padding:12px 20px}.profile-modal-btn{padding:8px 16px;font-size:13px}.profile-form-select{min-height:100px}.profile-form-checkbox-group{gap:8px}.profile-form-checkbox-label{padding:6px 10px;font-size:13px}}@media(max-width:480px){.profile-edit-modal-mask{padding:12px}.profile-edit-modal-header{padding:12px 16px}.profile-edit-modal-title{font-size:16px}.profile-edit-modal-body{padding:16px}.profile-form-section-title{font-size:14px}.profile-form-label{font-size:13px}.profile-form-input,.profile-form-textarea,.profile-form-select{font-size:13px;padding:8px 10px}.profile-form-hint{font-size:11px}.profile-edit-modal-footer{padding:10px 16px}.profile-modal-btn{padding:8px 14px;font-size:12px}.preferences-header{flex-direction:column;align-items:flex-start;gap:12px}.edit-btn{width:100%}}}.dialogue-container{min-height:100vh;background-color:#f5f7fa;display:flex;flex-direction:column;padding-top:64px}.dialogue-header{background:#fff;padding:16px 24px;border-bottom:1px solid #E0E0E0;flex-shrink:0;display:flex;align-items:center}.dialogue-title{font-size:18px;font-weight:600;color:#1e293b;margin:0}.messages-area{flex:1;padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:16px}.loading,.empty-state{text-align:center;padding:60px 20px;color:#6b7280;font-size:16px}.error-state{text-align:center;padding:40px;color:#ef4444;font-size:14px;background:#fef2f2;border-radius:8px;margin:20px;border:1px solid #FECACA}.error-icon{font-size:48px;margin-bottom:16px}.error-message{font-size:16px;font-weight:600;margin-bottom:12px}.error-hint{font-size:14px;color:#b91c1c;opacity:.8}.quick-prompts{display:flex;justify-content:space-between;max-width:600px;margin:0 auto}.prompt-bubble{padding:12px 16px;border-radius:8px;font-size:14px;color:#333;max-width:200px}.prompt-bubble.left{background:#f8f9fa;align-self:flex-start}.prompt-bubble.right{background:#fff;align-self:flex-end;box-shadow:0 2px 6px #0000000d}.message-bubble{display:flex;align-items:flex-start;gap:8px;max-width:70%}.message-bubble.left{align-self:flex-start}.message-bubble.right{align-self:flex-end;flex-direction:row-reverse}.message-avatar{font-size:20px;flex-shrink:0}.message-content{padding:12px 16px;border-radius:8px;font-size:14px;line-height:1.5;color:#333;word-wrap:break-word}.message-bubble.left .message-content{background:#f8f9fa}.message-bubble.right .message-content{background:#fff;box-shadow:0 2px 6px #0000000d}.input-area{background:#fff;padding:16px 24px;border-top:1px solid #E0E0E0;flex-shrink:0}.input-container{display:flex;align-items:center;gap:12px;margin-bottom:12px}.input-icon{font-size:16px;color:#333}.message-input{flex:1;min-height:80px;max-height:120px;padding:12px 16px;border:1px solid #E0E0E0;border-radius:6px;background:#f8f9fa;font-size:14px;color:#333;resize:none;font-family:inherit;line-height:1.5}.message-input:focus{outline:none;border-color:#2563eb;background:#fff}.message-input::placeholder{color:#999}.send-btn{width:40px;height:40px;border:none;background:transparent;font-size:16px;cursor:pointer;transition:all .2s ease;border-radius:6px}.send-btn:hover:not(:disabled){background:#f3f4f6}.send-btn:disabled{opacity:.5;cursor:not-allowed}.input-actions{display:flex;justify-content:center;gap:24px}.action-icon{font-size:16px;cursor:pointer;color:#333;opacity:.7;transition:opacity .2s ease}.action-icon:hover{opacity:1}@media(max-width:640px){.messages-area{padding:16px}.message-bubble{max-width:85%}.input-area{padding:12px 16px}.message-input{min-height:60px}}.end-dialogue-btn{margin-left:auto;padding:8px 16px;border:1px solid #EF4444;background:#fff;color:#ef4444;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease;white-space:nowrap}.end-dialogue-btn:hover{background:#fef2f2;border-color:#dc2626;color:#dc2626}.end-dialogue-btn:active{transform:scale(.98)}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-content{background:#fff;border-radius:12px;padding:24px;max-width:400px;width:90%;box-shadow:0 10px 25px #00000026;animation:slideIn .3s ease}@keyframes slideIn{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-title{font-size:18px;font-weight:600;color:#1e293b;margin:0 0 12px}.modal-message{font-size:14px;color:#6b7280;margin:0 0 20px;line-height:1.5}.modal-buttons{display:flex;gap:12px;justify-content:flex-end}.modal-buttons button{padding:8px 20px;border:none;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease}.btn-cancel{background:#f3f4f6;color:#6b7280}.btn-cancel:hover{background:#e5e7eb}.btn-confirm{background:#ef4444;color:#fff}.btn-confirm:hover{background:#dc2626}.btn-reject{background:#f3f4f6;color:#6b7280}.btn-reject:hover{background:#e5e7eb}.modal-buttons button:active{transform:scale(.98)}.post-container{min-height:100vh;background-color:#f5f7fa;padding:120px 20px 40px;display:flex;flex-direction:column;align-items:center}.post-header{position:absolute;top:64px;left:0;right:0;padding:12px 24px;display:flex;justify-content:flex-start;align-items:center}.back-btn{width:40px;height:40px;border:1px solid #E5E7EB;border-radius:8px;background:#fff;font-size:20px;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.back-btn:hover{background:#f9fafb;box-shadow:0 2px 4px #0000000d}.post-content{width:100%;max-width:800px;display:flex;flex-direction:column;gap:24px}.post-card{background:#fff;padding:40px;border-radius:12px;box-shadow:0 4px 6px -1px #0000000d}.post-title{font-size:24px;font-weight:600;color:#1e293b;text-align:center;margin-bottom:24px;line-height:1.5}.post-tags{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:24px;padding:16px;background:#f8fafc;border-radius:8px}.tag{padding:6px 14px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:13px;font-weight:500;border-radius:16px;white-space:nowrap}.post-meta{display:flex;justify-content:space-between;align-items:center;padding:16px;background:#f8fafc;border-radius:8px;border:1px solid #E2E8F0;margin-bottom:24px}.post-author,.post-time{font-size:14px;color:#64748b;font-weight:500}.post-body{margin-bottom:24px;padding:24px;background:#fafbfc;border:2px solid #E2E8F0;border-radius:12px;min-height:200px}.post-text{font-size:16px;line-height:1.8;color:#374151;margin-bottom:16px;white-space:pre-wrap;word-wrap:break-word}.post-text:last-child{margin-bottom:0}.post-actions{display:flex;justify-content:center}.dialogue-btn{padding:12px 32px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:16px;font-weight:600;border:none;border-radius:8px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px #667eea4d;text-decoration:none}.dialogue-btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px #667eea66}.dialogue-btn:active{transform:translateY(0)}@media(max-width:640px){.post-container{padding:100px 16px 32px}.post-card{padding:24px}.post-title{font-size:20px}.post-text{font-size:15px}.post-meta{flex-direction:column;gap:8px;text-align:center}}.navbar{background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 2px 10px #0000001a;position:sticky;top:0;z-index:1000}.nav-container{max-width:1200px;margin:0 auto;padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center}.nav-logo{font-size:1.8rem;font-weight:700;color:#fff;text-decoration:none;letter-spacing:2px;transition:transform .3s ease}.nav-logo:hover{transform:scale(1.05)}.nav-links{display:flex;gap:2rem;align-items:center}.nav-link{color:#fff;text-decoration:none;font-size:1rem;font-weight:500;padding:.5rem 1.2rem;border-radius:25px;transition:all .3s ease;background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.nav-link:hover{background:#ffffff40;transform:translateY(-2px);box-shadow:0 4px 15px #0003}.nav-link:active{transform:translateY(0)}.nav-link-active{background:#ffffff59!important;font-weight:600;box-shadow:0 4px 15px #00000040}.nav-dropdown{position:relative;display:inline-block}.nav-username{padding-bottom:.5rem!important}.dropdown-menu{display:none;position:absolute;right:0;top:100%;background:#fff;min-width:140px;box-shadow:0 8px 24px #00000026;border-radius:16px;padding:.5rem 0;margin-top:-.25rem;animation:fadeIn .3s ease-out;z-index:1001;border:1px solid rgba(102,126,234,.15);flex-direction:column;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}@keyframes fadeIn{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.nav-dropdown:hover .dropdown-menu{display:flex;flex-direction:column}.dropdown-item{padding:.9rem 1.5rem;color:#333;cursor:pointer;transition:all .2s ease;font-size:.95rem;background:#fff;flex-shrink:0;border:none;margin:.2rem .5rem;border-radius:10px}.dropdown-item:last-child{border-bottom:none}.dropdown-item:hover{background:linear-gradient(135deg,#667eea1a,#764ba21a);color:#667eea;transform:translate(4px)}.dropdown-item:hover{background:#f0f0f0;color:#667eea}@media(max-width:768px){.nav-container{padding:1rem}.nav-logo{font-size:1.5rem}.nav-links{gap:1rem}.nav-link{padding:.4rem .8rem;font-size:.9rem}}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;justify-content:center;align-items:center;z-index:2000;animation:fadeIn .3s ease-in-out}.modal-content{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 10px 40px #0000004d;max-width:400px;width:90%;animation:slideUp .3s ease-in-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.modal-title{margin:0 0 1.5rem;font-size:1.5rem;color:#333;text-align:center}.form-group{margin-bottom:1.2rem}.form-group label{display:block;margin-bottom:.5rem;color:#555;font-weight:500}.form-group input{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:6px;font-size:1rem;transition:border-color .3s ease}.form-group input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.error-message{background:#fee;color:#c33;padding:.75rem;border-radius:6px;margin-bottom:1rem;font-size:.9rem}.success-message{background:#efe;color:#3c3;padding:.75rem;border-radius:6px;margin-bottom:1rem;font-size:.9rem}.modal-buttons{display:flex;gap:1rem;margin-top:1.5rem}.modal-button{flex:1;padding:.75rem;border:none;border-radius:6px;font-size:1rem;font-weight:500;cursor:pointer;transition:all .3s ease}.modal-button:disabled{opacity:.6;cursor:not-allowed}.modal-button.secondary{background:#f5f5f5;color:#666}.modal-button.secondary:hover:not(:disabled){background:#e5e5e5}.modal-button.primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.modal-button.primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.notification-popup-container{position:fixed;top:80px;right:20px;z-index:10000;display:flex;flex-direction:column;gap:10px;max-width:350px}.notification-popup-item{background:#fff;border-radius:8px;box-shadow:0 4px 12px #00000026;padding:16px 20px;animation:slideIn .3s ease-out}.notification-popup-item.notification-pair_application{background:#ecf5ff;border:1px solid #409eff;border-left:4px solid #409eff}.notification-popup-item.notification-pair_accepted{background:#f0f9ff;border:1px solid #67c23a;border-left:4px solid #67c23a}.notification-popup-item.notification-end_request{border-left:4px solid #f56c6c}.notification-popup-item.removing{animation:slideOut .3s ease-out forwards}.notification-popup-content{display:flex;justify-content:space-between;align-items:center;gap:12px}.notification-popup-text{font-size:14px;color:#333;line-height:1.6;flex:1}.notification-username{font-weight:600;color:#333}.notification-pair{color:#409eff;font-weight:600}.notification-end{color:#f56c6c;font-weight:600}.notification-popup-close{background:transparent;border:none;color:#999;font-size:20px;cursor:pointer;padding:0;width:24px;height:24px;line-height:24px;text-align:center;border-radius:50%;transition:all .2s;flex-shrink:0}.notification-popup-close:hover{background:#f5f5f5;color:#666}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}@keyframes slideOut{0%{transform:translate(0);opacity:1}to{transform:translate(100%);opacity:0}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:#f5f7fa;color:#333}