:root{--bg-color: #ffffff;--text-color: #1a1a2e;--text-muted: #6b7280;--accent-color: #2196F3;--accent-dark: #1976D2;--border-color: #e5e7eb}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,Roboto,sans-serif;color:var(--text-color);background:var(--bg-color);-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh}#root{display:flex;flex-direction:column;flex:1}.page{flex:1;padding:60px 24px}.container{max-width:1200px;margin:0 auto;padding:0 24px}.header-brand{display:flex;align-items:center;gap:8px;font-size:20px;letter-spacing:-.5px}.header-logo{width:24px;height:24px}header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid var(--border-color);background:#ffffffe6;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:sticky;top:0;z-index:100}header nav a{margin-left:24px;color:var(--text-muted);text-decoration:none;font-size:14px;font-weight:500;transition:color .15s ease}header nav a:hover{color:var(--accent-color)}header nav .lang-btn{margin-left:16px;padding:2px 10px;border:1px solid var(--border-color);border-radius:4px;background:transparent;color:var(--text-muted);font-size:12px;font-weight:600;cursor:pointer;transition:all .15s ease;vertical-align:middle;line-height:1.6}header nav .lang-btn:hover{border-color:var(--accent-color);color:var(--accent-color);background:#2196f30f}.hero{text-align:center;padding:100px 24px 80px;background:linear-gradient(180deg,#f0f7ff 0%,transparent 100%)}.hero h1{font-size:52px;font-weight:800;margin-bottom:20px;line-height:1.15;letter-spacing:-1px}.hero .hero-l2{display:inline-block;padding-left:80px}.hero p{font-size:17px;color:var(--text-muted);max-width:620px;margin:0 auto 36px;line-height:1.7}.btn{display:inline-block;padding:12px 32px;border-radius:8px;font-size:15px;font-weight:600;text-decoration:none;cursor:pointer;border:none;transition:all .2s ease}.btn-primary{background:var(--accent-color);color:#fff}.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px);box-shadow:0 4px 12px #2196f34d}.btn-outline{background:transparent;color:var(--text-color);border:1.5px solid var(--border-color)}.btn-outline:hover{border-color:var(--accent-color);color:var(--accent-color)}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding:40px 0}.feature-card{padding:16px;border:1px solid var(--border-color);border-radius:10px;transition:box-shadow .2s ease,transform .2s ease;display:flex;flex-direction:column}.feature-card:hover{box-shadow:0 4px 20px #0000000f;transform:translateY(-2px)}.feature-card h3{margin-bottom:10px;font-size:16px;display:flex;align-items:center;gap:8px}.feature-card-title{display:flex;align-items:center;gap:8px}.feature-card-icon{width:22px;height:22px;flex-shrink:0}.feature-card p{color:var(--text-muted);font-size:13.5px;line-height:1.7;flex:1}footer{padding:28px 24px;border-top:1px solid var(--border-color);color:var(--text-muted);font-size:13px}.footer-inner{max-width:1200px;margin:0 auto;display:flex;flex-direction:column;align-items:center;gap:8px}.footer-main{display:flex;align-items:center;gap:10px}.footer-brand{font-weight:700;color:var(--text-color);letter-spacing:-.3px}.footer-sep{color:var(--border-color)}.footer-copy{font-size:12.5px}.footer-links{display:flex;align-items:center;gap:8px;font-size:12.5px}.footer-dot{color:var(--border-color)}footer a{color:var(--text-muted);text-decoration:none;transition:color .15s}footer a:hover{color:var(--accent-color);text-decoration:underline}.page h1{font-size:36px;margin-bottom:16px}.page p{color:var(--text-muted);line-height:1.7;margin-bottom:16px}.help-layout{display:flex;min-height:calc(100vh - 140px);max-width:1400px;margin:0 auto}.help-sidebar{width:260px;min-width:260px;border-right:1px solid var(--border-color);padding:0;overflow-y:auto;position:sticky;top:60px;align-self:flex-start;max-height:calc(100vh - 140px);transition:width .2s,min-width .2s,opacity .2s}.help-sidebar.collapsed{width:0;min-width:0;overflow:hidden;opacity:0}.help-sidebar-toggle{position:sticky;top:60px;align-self:flex-start;z-index:10;width:20px;padding:0;border:1px solid var(--border-color);border-left:none;border-radius:0 4px 4px 0;background:#f9fafb;color:var(--text-muted);font-size:11px;cursor:pointer;line-height:40px;text-align:center;transition:color .15s}.help-sidebar-toggle:hover{color:var(--accent-color);background:#f0f7ff}.help-sidebar-title{padding:16px 16px 8px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted)}.help-sidebar-nav{padding-bottom:24px}.help-sidebar-group{-webkit-user-select:none;user-select:none}.help-sidebar-item{display:flex;align-items:center;gap:6px;padding:8px 16px;cursor:pointer;font-size:13px;color:var(--text-muted);transition:all .15s;border-left:3px solid transparent}.help-sidebar-item:hover{color:var(--text-color);background:#f9fafb}.help-sidebar-item.active{color:var(--accent-color);background:#2196f30f;border-left-color:var(--accent-color);font-weight:600}.help-sidebar-arrow{font-size:10px;transition:transform .15s;display:inline-block;width:12px;flex-shrink:0;color:#bbb}.help-sidebar-arrow.expanded{transform:rotate(180deg)}.help-sidebar-icon{flex-shrink:0;font-size:14px}.help-sidebar-label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.help-content{flex:1;padding:40px 48px 60px;overflow-y:auto;min-width:0}.help-content-title{font-size:28px;font-weight:700;margin-bottom:28px;line-height:1.3}.help-empty{display:flex;align-items:center;justify-content:center;min-height:400px;color:var(--text-muted);font-size:15px}.help-blocks{max-width:780px}.help-block-h2{font-size:22px;font-weight:700;margin:36px 0 16px;padding-bottom:8px;border-bottom:1px solid var(--border-color)}.help-block-h3{font-size:17px;font-weight:600;margin:28px 0 12px;color:var(--text-color)}.help-block-p{font-size:15px;line-height:1.8;margin-bottom:16px;color:var(--text-color)}.help-block-steps,.help-block-ol{margin:16px 0;padding-left:24px;font-size:15px;line-height:1.8}.help-block-steps li,.help-block-ol li{margin-bottom:10px}.help-block-ul{margin:12px 0;padding-left:20px;font-size:15px;line-height:1.8;list-style:disc}.help-block-ul li{margin-bottom:6px}.help-block-code-wrapper{margin:16px 0 24px;border:1px solid var(--border-color);border-radius:8px;overflow:hidden}.help-block-code-header{padding:6px 16px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);background:#f9fafb;border-bottom:1px solid var(--border-color)}.help-block-code{padding:16px;margin:0;font-size:13px;line-height:1.7;overflow-x:auto;background:#f9fafb;font-family:SF Mono,Fira Code,Fira Mono,Menlo,Consolas,monospace}.help-block-table-wrapper{margin:16px 0 24px;overflow-x:auto}.help-block-table{width:100%;border-collapse:collapse;font-size:14px}.help-block-table th,.help-block-table td{padding:10px 14px;text-align:left;border:1px solid var(--border-color)}.help-block-table th{background:#f9fafb;font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.3px;color:var(--text-muted)}.help-block-table td{font-size:14px;line-height:1.6}.help-block-callout{margin:16px 0 24px;padding:14px 18px;border-radius:8px;font-size:14px;line-height:1.7;border-left:4px solid}.help-block-info{background:#f0f7ff;border-left-color:var(--accent-color);color:#1a56db}.help-block-warning{background:#fff8e6;border-left-color:#f59e0b;color:#92400e}.help-block-tip{background:#f0fdf4;border-left-color:#22c55e;color:#166534}.help-block-figure{margin:20px 0;text-align:center}.help-block-img{max-width:100%;border:1px solid var(--border-color);border-radius:8px;cursor:zoom-in}.help-block-figure figcaption{margin-top:8px;font-size:13px;color:var(--text-muted)}.checkout h1{text-align:center;margin-bottom:32px}.checkout-plan-card{border:1px solid var(--border-color);border-radius:12px;padding:20px;margin-bottom:24px}.checkout-plan-card h2{margin-bottom:4px;font-size:18px}.checkout-price{font-size:28px;font-weight:700}.checkout-period{color:var(--text-muted);font-size:14px}.checkout-field{margin-bottom:20px}.checkout-field label{display:block;margin-bottom:6px;font-weight:600}.checkout-field input{width:100%;padding:10px 14px;border-radius:8px;font-size:14px;border:1px solid var(--border-color);background:var(--bg-color)}.checkout-providers{display:flex;gap:12px}.checkout-provider-btn{flex:1;padding:12px 16px;border-radius:8px;cursor:pointer;font-size:15px;border:1px solid var(--border-color);background:transparent}.checkout-provider-btn.active{border:2px solid var(--accent-color);background:#f0f7ff;font-weight:700}.checkout-message{color:#e53935;margin-bottom:12px;font-size:13px}.btn-block{width:100%;padding:12px;font-size:16px;font-weight:700}.btn-block:disabled{opacity:.6;cursor:not-allowed}.checkout-qr{text-align:center;padding-top:20px}.checkout-qr h2{margin-bottom:8px}.checkout-qr-desc{color:var(--text-muted);margin-bottom:28px;font-size:14px}.checkout-qr-box{display:inline-block;padding:16px;border-radius:12px;border:1px solid var(--border-color);margin-bottom:24px}.checkout-qr-box img{width:220px;height:220px}.checkout-qr-placeholder{width:220px;height:220px;display:flex;align-items:center;justify-content:center;background:#f5f5f5;border-radius:8px;font-size:13px;color:#999}.checkout-waiting{font-size:13px;color:var(--text-muted)}.checkout-waiting-icon{display:inline-block;margin-left:4px}.checkout-cancel-btn{margin-top:16px;background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:13px;text-decoration:underline}.checkout-success{text-align:center;padding-top:40px}.checkout-success-icon{font-size:48px;margin-bottom:16px}.checkout-success-desc{color:var(--text-muted);margin-bottom:24px;font-size:14px}.checkout-license-key{padding:16px 20px;border-radius:8px;background:#f0f7ff;border:1px solid var(--accent-color);margin-bottom:24px;font-family:monospace;font-size:14px;word-break:break-all}.checkout-license-key-label{font-weight:600;margin-bottom:4px;font-size:12px;color:var(--text-muted)}.checkout-activate-hint{font-size:13px;color:var(--text-muted);margin-bottom:24px}.checkout-actions{display:flex;gap:12px;justify-content:center}.checkout-actions a{text-decoration:none}.checkout-error{text-align:center;padding-top:40px}.checkout-error-icon{font-size:48px;margin-bottom:16px}.checkout-error-msg{color:var(--text-muted);margin-bottom:24px;font-size:14px}@media(prefers-color-scheme:dark){.checkout-provider-btn.active,.checkout-license-key{background:#1a3a5c}.checkout-qr-placeholder{background:#1a1a2e;color:#666}}.checkout{width:40%;max-width:640px;min-width:380px;margin:0 auto;padding-top:40px}@media(max-width:768px){.features{grid-template-columns:1fr}.hero h1{font-size:36px}header nav a{margin-left:16px;font-size:13px}.help-sidebar{display:none}.help-content{padding:24px 20px 40px}.help-sidebar-toggle{display:none}}.user-dropdown{position:relative;display:inline-block;margin-left:16px}.user-trigger{display:flex;align-items:center;gap:8px;padding:6px 12px;border:1px solid var(--border-color);border-radius:8px;background:transparent;cursor:pointer;font-size:14px;transition:all .15s;color:var(--text-color)}.user-trigger:hover{border-color:var(--accent-color);background:#2196f30a}.user-avatar{width:26px;height:26px;border-radius:50%;background:var(--accent-color);color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0}.user-name{font-weight:600;max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.user-arrow{font-size:10px;color:#9ca3af;transition:transform .2s}.user-arrow.open{transform:rotate(180deg)}.dropdown-menu{position:absolute;top:calc(100% + 6px);right:0;min-width:180px;background:#fff;border:1px solid var(--border-color);border-radius:12px;box-shadow:0 8px 30px #0000001a;padding:6px;z-index:200}.dropdown-item{display:flex;align-items:center;gap:8px;padding:9px 12px;border-radius:8px;cursor:pointer;font-size:14px;color:#374151;transition:all .1s;text-decoration:none;border:none;background:none;width:100%;text-align:left}.dropdown-item:hover{background:#f3f4f6;color:#111827}.dropdown-item:active{background:#e5e7eb}.dropdown-item.danger{color:#e53935}.dropdown-item.danger:hover{background:#fef2f2}.dropdown-divider{height:1px;background:var(--border-color);margin:4px 8px}.dropdown-icon{font-size:15px;width:20px;text-align:center}.dropdown-item{margin-left:0!important}