.help-center-prototype{--help-center-toolbar-height:72px;--help-center-tabs-height:56px;--text-primary:#2D3139;--text-secondary:#6B7280;--text-tertiary:#9CA3AF;--text-muted:#A1A7B3;--border-default:#F0EDE9;--border-light:#F5F2EE;--border-hover:#E8E4E0;--success:#10B981;--success-bg:#ECFDF5;--warning:#F59E0B;--danger:#EF4444;--font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;--font-mono:"SF Mono","Fira Code","Fira Mono",Menlo,Consolas,monospace;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--radius-sm:4px;--radius-md:6px;--radius-lg:8px;--transition-fast:0.15s ease;--transition-base:0.2s ease}.help-center-prototype *,.help-center-prototype :after,.help-center-prototype :before{margin:0;padding:0;box-sizing:border-box}.help-center-prototype{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:var(--font-sans);font-size:14px;line-height:1.6;color:var(--text-primary);background:var(--bg-base)}.help-center-prototype a{color:var(--brand-primary);text-decoration:none;transition:color var(--transition-fast)}.help-center-prototype a:hover{color:var(--brand-primary-dark)}.help-center-prototype ol,.help-center-prototype ul{list-style:none}.help-center-prototype button{font-family:inherit;cursor:pointer;border:none;background:none}.help-center-prototype .site-header{background:var(--bg-card);border-bottom:1px solid var(--border-default);position:sticky;top:0;z-index:1000;height:var(--help-center-toolbar-height)}.help-center-prototype .site-header-inner{max-width:1440px;margin:0 auto;padding:0 var(--space-6);height:100%;display:grid;grid-template-columns:minmax(180px,1fr) minmax(360px,560px) minmax(180px,1fr);align-items:center;gap:var(--space-6)}.help-center-prototype .site-header-inner .brand{flex-shrink:0}.help-center-prototype .site-header-inner .header-right{grid-column:2;position:static;transform:none;width:100%}.help-center-prototype .brand{display:flex;align-items:center;gap:var(--space-3);flex-shrink:0}.help-center-prototype .brand-logo{width:32px;height:32px;display:flex;align-items:center;justify-content:center}.help-center-prototype .brand-logo img{width:100%;height:100%;-o-object-fit:contain;object-fit:contain}.help-center-prototype .brand-name{font-size:16px;font-weight:600;color:var(--text-primary)}.help-center-prototype .brand-divider{width:1px;height:16px;background:var(--border-default);margin:0 var(--space-2)}.help-center-prototype .brand-sub{font-size:14px;font-weight:400;color:var(--text-secondary)}.help-center-prototype .help-center-brand{min-width:0}.help-center-prototype .help-center-brand .brand-sub{color:var(--text-primary);font-size:21px;font-weight:750;line-height:1.1}.help-center-prototype .header-right{display:flex;align-items:center;gap:var(--space-4)}.help-center-prototype .header-search{position:relative;width:100%}.help-center-prototype .header-search input{width:100%;height:44px;background:color-mix(in srgb,var(--bg-card) 72%,var(--bg-base));border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:0 var(--space-5) 0 42px;font-size:14px;color:var(--text-primary);outline:none;transition:all var(--transition-fast)}.help-center-prototype .header-search input::-moz-placeholder{color:var(--text-muted)}.help-center-prototype .header-search input::placeholder{color:var(--text-muted)}.help-center-prototype .header-search input:focus{border-color:var(--brand-primary);background:var(--bg-card);box-shadow:0 0 0 3px var(--brand-primary-subtle)}.help-center-prototype .header-search-icon{position:absolute;left:var(--space-4);top:50%;transform:translateY(-50%);color:var(--text-muted)}.help-center-prototype .header-search-icon svg{width:16px;height:16px}.help-center-prototype .main-layout{max-width:1440px;margin:0 auto;display:flex;min-height:calc(100vh - var(--help-center-toolbar-height))}.help-center-prototype .sidebar{width:240px;flex-shrink:0;background:var(--bg-sidebar);border-right:1px solid var(--border-default);padding:var(--space-4) 0}.help-center-prototype .sidebar-section{margin-bottom:var(--space-2)}.help-center-prototype .sidebar-section-title{padding:var(--space-2) var(--space-4);font-size:12px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;display:flex;align-items:center;justify-content:space-between;cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none}.help-center-prototype .sidebar-section-title:hover{color:var(--text-secondary)}.help-center-prototype .sidebar-section-title svg{width:14px;height:14px;transition:transform var(--transition-fast);opacity:.5}.help-center-prototype .sidebar-section.collapsed .sidebar-section-title svg{transform:rotate(-90deg)}.help-center-prototype .sidebar-section.collapsed .sidebar-links{display:none}.help-center-prototype .sidebar-link{display:flex;align-items:center;gap:var(--space-3);margin:2px var(--space-3);padding:8px var(--space-3);font-size:13px;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);border-radius:var(--radius-md)}.help-center-prototype .sidebar-link:hover{color:var(--brand-primary);background:var(--bg-hover)}.help-center-prototype .sidebar-link.active{color:var(--brand-primary);background:var(--bg-selected);font-weight:500}.help-center-prototype .sidebar-link svg{width:16px;height:16px;flex-shrink:0}.help-center-prototype .sidebar-link .new-badge{margin-left:auto;font-size:10px;font-weight:600;color:var(--brand-primary);background:var(--brand-primary-subtle);padding:2px 6px;border-radius:var(--radius-sm)}.help-center-prototype .content-area{flex:1;min-width:0;display:flex;flex-direction:column;background:var(--bg-base);scroll-margin-top:calc(var(--header-height) + var(--help-center-toolbar-height) + var(--help-center-tabs-height) + 8px)}.help-center-prototype .breadcrumb-bar{padding:var(--space-3) var(--space-6);display:flex;align-items:center;gap:var(--space-2);font-size:13px;color:var(--text-tertiary)}.help-center-prototype .breadcrumb-bar a,.help-center-prototype .breadcrumb-bar button{color:var(--text-secondary);text-decoration:none;font-size:inherit;line-height:inherit;cursor:pointer}.help-center-prototype .breadcrumb-bar a:hover,.help-center-prototype .breadcrumb-bar button:hover{color:var(--brand-primary)}.help-center-prototype .breadcrumb-bar .current{color:var(--text-primary);font-weight:500}.help-center-prototype .breadcrumb-sep{color:var(--border-hover)}.help-center-prototype .content-body{flex:1;padding:var(--space-4) var(--space-6) var(--space-8);max-width:900px}.help-center-prototype .doc-title{font-size:24px;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-3);line-height:1.3}.help-center-prototype .doc-meta{display:flex;align-items:center;gap:var(--space-4);margin-bottom:var(--space-6);padding-bottom:var(--space-4);border-bottom:1px solid var(--border-default);font-size:13px;color:var(--text-tertiary)}.help-center-prototype .doc-meta .meta-tag{display:inline-flex;align-items:center;padding:3px 10px;font-size:12px;font-weight:500;color:var(--brand-primary);background:var(--brand-primary-subtle);border-radius:var(--radius-md)}.help-center-prototype .doc-section{margin-bottom:var(--space-6)}.help-center-prototype .doc-section h2{font-size:17px;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-3);padding-bottom:var(--space-2);border-bottom:1px solid var(--border-light);line-height:1.4}.help-center-prototype .doc-section h3{font-size:15px;font-weight:600;color:var(--text-primary);margin:var(--space-4) 0 var(--space-3);line-height:1.4}.help-center-prototype .doc-section p{color:var(--text-secondary);margin-bottom:var(--space-3);line-height:1.7}.help-center-prototype .doc-section ul{padding-left:var(--space-5);margin-bottom:var(--space-3)}.help-center-prototype .doc-section ul li{color:var(--text-secondary);margin-bottom:var(--space-2);line-height:1.7;list-style:disc}.help-center-prototype .doc-section strong{color:var(--text-primary);font-weight:600}.help-center-prototype .doc-inline-action{color:var(--brand-primary);font-size:14px;font-weight:600;cursor:pointer}.help-center-prototype .doc-inline-action:hover{color:var(--brand-primary-dark);text-decoration:underline;text-underline-offset:3px}.help-center-prototype .info-box{border-radius:var(--radius-lg);padding:var(--space-4) var(--space-5);margin:var(--space-4) 0;display:flex;gap:var(--space-3);font-size:13px;line-height:1.65;background:var(--bg-card);border:1px solid var(--border-default);border-left:3px solid var(--brand-primary)}.help-center-prototype .info-box .info-icon{flex-shrink:0;color:var(--brand-primary)}.help-center-prototype .info-box .info-icon svg{width:18px;height:18px}.help-center-prototype .doc-table{width:100%;border-collapse:collapse;margin:var(--space-4) 0;font-size:13px;background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-default)}.help-center-prototype .doc-table th{background:var(--bg-base);padding:10px var(--space-4);text-align:left;font-weight:600;color:var(--text-primary);border-bottom:1px solid var(--border-default);font-size:12px}.help-center-prototype .doc-table td{padding:10px var(--space-4);border-bottom:1px solid var(--border-light);color:var(--text-secondary);line-height:1.5}.help-center-prototype .doc-table tr:last-child td{border-bottom:none}.help-center-prototype .doc-table tr:hover td{background:var(--bg-hover)}.help-center-prototype .card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-4);margin:var(--space-4) 0}.help-center-prototype .card-grid.two-col{grid-template-columns:repeat(2,1fr)}.help-center-prototype .card{background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:var(--space-5);transition:all var(--transition-fast);cursor:pointer}.help-center-prototype .card:hover{border-color:var(--brand-primary);box-shadow:0 2px 8px rgba(242,122,24,.08)}.help-center-prototype .card-icon{width:36px;height:36px;margin-bottom:var(--space-3);display:flex;align-items:center;justify-content:center;color:var(--brand-primary);background:var(--brand-primary-subtle);border-radius:var(--radius-md)}.help-center-prototype .card-icon svg{width:18px;height:18px}.help-center-prototype .card h4{font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-2);line-height:1.4}.help-center-prototype .card p{font-size:12px;color:var(--text-tertiary);line-height:1.55;margin:0}.help-center-prototype .step-card{display:flex;align-items:flex-start;gap:var(--space-4);background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:var(--space-4) var(--space-5);margin-bottom:var(--space-3)}.help-center-prototype .step-num{width:28px;height:28px;border-radius:50%;background:var(--brand-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}.help-center-prototype .step-content h4{font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:2px}.help-center-prototype .step-content p{font-size:13px;color:var(--text-tertiary);margin:0}.help-center-prototype .doc-footer{margin-top:var(--space-8);padding-top:var(--space-5);border-top:1px solid var(--border-default);display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-tertiary)}.help-center-prototype .doc-footer-nav{display:flex;gap:var(--space-4)}.help-center-prototype .doc-footer-nav a,.help-center-prototype .doc-footer-nav button{display:flex;flex-direction:column;align-items:flex-start;gap:2px;min-width:144px;min-height:48px;color:var(--text-secondary);text-decoration:none;font-size:13px;padding:var(--space-2) var(--space-4);border:1px solid var(--border-default);border-radius:var(--radius-lg);background:var(--bg-card);transition:all var(--transition-fast)}.help-center-prototype .doc-footer-nav button span{font-weight:600}.help-center-prototype .doc-footer-nav button small{max-width:168px;color:var(--text-tertiary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.help-center-prototype .doc-footer-nav button:disabled{cursor:not-allowed;opacity:.45}.help-center-prototype .doc-footer-nav a:hover,.help-center-prototype .doc-footer-nav button:not(:disabled):hover{border-color:var(--brand-primary);color:var(--brand-primary);background:var(--bg-selected)}.help-center-prototype .platform-tabs{display:flex;gap:var(--space-1);padding:var(--space-3) var(--space-5);border-bottom:1px solid var(--border-default);background:var(--bg-card);min-height:var(--help-center-tabs-height);position:sticky;top:calc(var(--header-height) + var(--help-center-toolbar-height));z-index:990;box-shadow:0 8px 18px rgba(15,23,42,.04)}.help-center-prototype .platform-tab{padding:var(--space-2) var(--space-4);font-size:13px;font-weight:500;color:var(--text-secondary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;gap:var(--space-2)}.help-center-prototype .platform-tab:hover{color:var(--brand-primary);background:var(--bg-hover)}.help-center-prototype .platform-tab.active{color:var(--brand-primary);background:var(--bg-selected);font-weight:600}.help-center-prototype .platform-tab svg{width:16px;height:16px}.help-center-prototype .search-dropdown{position:absolute;top:48px;left:50%;width:min(640px,calc(100vw - 40px));max-height:min(520px,calc(100vh - 180px));background:var(--bg-card);border:1px solid var(--border-default);border-radius:var(--radius-lg);box-shadow:0 18px 44px rgba(15,23,42,.13);display:none;z-index:100;overflow:auto;transform:translateX(-50%)}.help-center-prototype .search-dropdown.show{display:block}.help-center-prototype .search-dropdown-header{position:sticky;top:0;z-index:1;padding:var(--space-3) var(--space-4);font-size:11px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--border-light);display:flex;justify-content:space-between;background:color-mix(in srgb,var(--bg-card) 92%,var(--bg-base))}.help-center-prototype .search-result-item{display:grid;grid-template-columns:86px minmax(0,1fr);align-items:center;gap:var(--space-3);width:100%;padding:var(--space-3) var(--space-4);cursor:pointer;text-align:left;transition:background var(--transition-fast),color var(--transition-fast);border-bottom:1px solid var(--border-light)}.help-center-prototype .search-result-item:hover{background:var(--bg-hover)}.help-center-prototype .search-result-item:last-child{border-bottom:none}.help-center-prototype .search-result-main{min-width:0}.help-center-prototype .search-result-title{font-size:14px;color:var(--text-primary);font-weight:650}.help-center-prototype .search-result-title em{color:var(--brand-primary);font-style:normal;font-weight:600}.help-center-prototype .search-result-desc{font-size:12px;color:var(--text-tertiary);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.help-center-prototype .search-result-tag{display:inline-flex;justify-content:center;align-items:center;font-size:10px;font-weight:600;min-height:24px;padding:2px 8px;border-radius:var(--radius-sm);text-transform:uppercase;letter-spacing:.03em}.help-center-prototype .search-result-tag.orange{background:var(--brand-primary-subtle);color:var(--brand-primary)}.help-center-prototype .search-result-item:hover .search-result-title{color:var(--brand-primary)}.help-center-prototype .search-result-empty{padding:var(--space-6);color:var(--text-tertiary);text-align:center}@media (max-width:1200px){.help-center-prototype .sidebar{width:200px}.help-center-prototype .content-body{padding:var(--space-4)}.help-center-prototype .card-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width:900px){.help-center-prototype .site-header-inner{grid-template-columns:minmax(120px,auto) minmax(220px,1fr);gap:var(--space-3)}.help-center-prototype .sidebar{display:none}.help-center-prototype .platform-tabs{overflow-x:auto}.help-center-prototype .platform-tabs::-webkit-scrollbar{display:none}.help-center-prototype .header-search input{width:100%}}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.help-center-prototype .content-body{animation:fadeIn .2s ease}.help-center-prototype{--brand-primary:var(--color-primary-light,#2563eb);--brand-primary-dark:var(--color-primary,#1d4ed8);--brand-primary-light:var(--color-secondary-light,#06b6d4);--brand-primary-subtle:rgba(37,99,235,0.1);--bg-base:var(--current-bg,#f7f9fc);--bg-card:var(--current-card,#ffffff);--bg-sidebar:var(--current-card,#ffffff);--bg-hover:rgba(37,99,235,0.06);--bg-selected:rgba(37,99,235,0.1);--text-primary:var(--current-text-primary,#2d3139);--text-secondary:var(--current-text-secondary,#6b7280);--text-tertiary:var(--current-text-muted,#9ca3af);--text-muted:var(--current-text-muted,#a1a7b3);--border-default:var(--current-border,#e5e7eb);--border-light:rgba(148,163,184,0.22);--border-hover:rgba(37,99,235,0.26);padding-top:var(--header-height)}:root[data-theme=dark] .help-center-prototype{--brand-primary:#60a5fa;--brand-primary-dark:#93c5fd;--brand-primary-light:#22d3ee;--brand-primary-subtle:rgba(96,165,250,0.14);--bg-base:#0e0e15;--bg-card:#151824;--bg-sidebar:#151824;--bg-hover:rgba(96,165,250,0.09);--bg-selected:rgba(96,165,250,0.14);--text-primary:#f7f9ff;--text-secondary:#c4ccda;--text-tertiary:#8e99aa;--text-muted:#7f8a9c;--border-default:#2b3243;--border-light:#252b3a;--border-hover:rgba(96,165,250,0.32)}.help-center-prototype .site-header{top:var(--header-height)}.help-center-prototype .brand-logo img,.help-center-prototype .doc-section img{display:block}.help-center-prototype .doc-section img{height:auto}@media (max-width:640px){.help-center-prototype{--help-center-toolbar-height:64px;--help-center-tabs-height:52px}.help-center-prototype .site-header-inner{grid-template-columns:auto minmax(0,1fr);gap:var(--space-3);padding:0 var(--space-3)}.help-center-prototype .site-header-inner .header-right{position:static;transform:none}.help-center-prototype .brand-divider,.help-center-prototype .brand-sub{display:none}.help-center-prototype .help-center-brand{min-width:auto}.help-center-prototype .help-center-brand .brand-sub{display:inline;font-size:16px;font-weight:700}.help-center-prototype .header-search input{width:100%;height:40px;padding-left:36px;font-size:13px}.help-center-prototype .header-search-icon{left:var(--space-3)}.help-center-prototype .search-dropdown{left:auto;right:0;transform:none;width:min(360px,calc(100vw - 24px))}.help-center-prototype .search-result-item{grid-template-columns:72px minmax(0,1fr);padding:var(--space-3)}.help-center-prototype .content-body{max-width:none}.help-center-prototype .card-grid,.help-center-prototype .card-grid.two-col{grid-template-columns:1fr}}