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.login-modal:before{content:"";position:absolute;top:-1px;right:-1px;bottom:-1px;left:-1px;border-radius:inherit;padding:1px;background:conic-gradient(from var(--auth-angle),transparent 0deg,transparent 80deg,rgba(59,130,246,.7) 110deg,rgba(139,92,246,.7) 140deg,transparent 200deg);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;opacity:.6;animation:auth-rotate 8s linear infinite}.login-overlay .login-modal:after{content:"";position:absolute;top:0;left:30%;right:30%;height:2px;background:linear-gradient(90deg,transparent,#3b82f6,#8b5cf6,transparent);border-radius:0 0 4px 4px;opacity:.85;filter:blur(.4px);pointer-events:none}.login-overlay .modal-header{text-align:center;margin-bottom:22px}.login-overlay .modal-header 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.06);--kb-bg: #ffffff;--kb-bg-soft: #f5f7fa;--kb-bg-mute: #ebeef5;--kb-bg-sidebar: #fafbfc;--kb-bg-code: #f6f8fa;--kb-bg-hover: rgba(0, 0, 0, .02);--kb-text-1: #1f2329;--kb-text-2: #585a5a;--kb-text-3: #8a8f8d;--kb-text-4: #bbbfc4;--kb-text-link: #1890ff;--kb-text-link-hover: #40a9ff;--kb-border: #e8e8e8;--kb-border-light: #f0f0f0;--kb-border-dark: #d9d9d9;--kb-border-focus: #1890ff;--kb-shadow-1: 0 1px 2px rgba(0, 0, 0, .04);--kb-shadow-2: 0 2px 8px rgba(0, 0, 0, .08);--kb-shadow-3: 0 4px 16px rgba(0, 0, 0, .12);--kb-shadow-card: 0 1px 3px rgba(0, 0, 0, .05), 0 1px 2px rgba(0, 0, 0, .03);--kb-shadow-hover: 0 4px 12px rgba(0, 0, 0, .1);--kb-sidebar-width: 260px;--kb-outline-width: 200px;--kb-content-max: 800px;--kb-nav-height: 60px;--kb-progress-height: 3px;--kb-space-xs: 4px;--kb-space-sm: 8px;--kb-space-md: 16px;--kb-space-lg: 24px;--kb-space-xl: 32px;--kb-space-2xl: 48px;--kb-radius-sm: 4px;--kb-radius-md: 6px;--kb-radius-lg: 8px;--kb-radius-xl: 12px;--kb-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--kb-font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Menlo, Consolas, "Liberation Mono", monospace;--kb-font-size-xs: 12px;--kb-font-size-sm: 13px;--kb-font-size-base: 14px;--kb-font-size-md: 15px;--kb-font-size-lg: 16px;--kb-font-size-xl: 18px;--kb-font-size-2xl: 20px;--kb-font-size-3xl: 24px;--kb-font-size-4xl: 32px;--kb-line-height: 1.7;--kb-line-height-tight: 1.4;--kb-line-height-loose: 1.9;--kb-transition-fast: .1s ease;--kb-transition-base: .2s ease;--kb-transition-slow: .3s ease;--kb-z-dropdown: 100;--kb-z-sticky: 200;--kb-z-modal: 1000;--kb-z-tooltip: 1100;--kb-z-progress: 1200;--kb-success: #52c41a;--kb-success-bg: #f6ffed;--kb-warning: #faad14;--kb-warning-bg: #fffbe6;--kb-error: #ff4d4f;--kb-error-bg: #fff2f0;--kb-info: #1890ff;--kb-info-bg: #e6f7ff;--kb-vip-gold: #faad14;--kb-vip-gold-light: #fffbe6;--kb-vip-gradient: linear-gradient(135deg, #ffd700 0%, #ffb347 100%);--kb-paywall-bg: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, .95) 30%, #fff 100%)}.dark{--kb-primary: #3b9dff;--kb-primary-hover: #5aadff;--kb-primary-active: #1a7dd9;--kb-primary-light: #112a45;--kb-primary-bg: rgba(59, 157, 255, .1);--kb-bg: #1a1a1a;--kb-bg-soft: #242424;--kb-bg-mute: #2c2c2c;--kb-bg-sidebar: #1f1f1f;--kb-bg-code: #2d2d2d;--kb-bg-hover: rgba(255, 255, 255, .04);--kb-text-1: #e8e8e8;--kb-text-2: #a8a8a8;--kb-text-3: #6b6b6b;--kb-text-4: #4a4a4a;--kb-text-link: #3b9dff;--kb-text-link-hover: #5aadff;--kb-border: #383838;--kb-border-light: #2e2e2e;--kb-border-dark: #484848;--kb-border-focus: #3b9dff;--kb-shadow-1: 0 1px 2px rgba(0, 0, 0, .2);--kb-shadow-2: 0 2px 8px rgba(0, 0, 0, .3);--kb-shadow-3: 0 4px 16px rgba(0, 0, 0, .4);--kb-shadow-card: 0 1px 3px rgba(0, 0, 0, .2);--kb-shadow-hover: 0 4px 12px rgba(0, 0, 0, .3);--kb-success: #73d13d;--kb-success-bg: #162312;--kb-warning: #faad14;--kb-warning-bg: #2b2111;--kb-error: #ff7875;--kb-error-bg: #2a1215;--kb-info: #3b9dff;--kb-info-bg: #111a2c;--kb-vip-gold: #ffc53d;--kb-vip-gold-light: #2b2611;--kb-paywall-bg: linear-gradient(180deg, transparent 0%, rgba(26, 26, 26, .95) 30%, #1a1a1a 100%)}:root{--vp-c-brand-1: var(--kb-primary);--vp-c-brand-2: var(--kb-primary-hover);--vp-c-brand-3: var(--kb-primary-active);--vp-c-brand-soft: var(--kb-primary-bg);--vp-c-bg: var(--kb-bg);--vp-c-bg-soft: var(--kb-bg-soft);--vp-c-bg-mute: var(--kb-bg-mute);--vp-c-bg-alt: var(--kb-bg-sidebar);--vp-c-text-1: var(--kb-text-1);--vp-c-text-2: var(--kb-text-2);--vp-c-text-3: var(--kb-text-3);--vp-c-divider: var(--kb-border);--vp-c-divider-light: var(--kb-border-light);--vp-c-gutter: var(--kb-border-light);--vp-sidebar-width: var(--kb-sidebar-width);--vp-nav-height: var(--kb-nav-height);--vp-custom-block-tip-border: var(--kb-primary);--vp-custom-block-tip-text: var(--kb-primary);--vp-custom-block-tip-bg: var(--kb-info-bg);--vp-button-brand-border: var(--kb-primary);--vp-button-brand-text: #fff;--vp-button-brand-bg: var(--kb-primary);--vp-button-brand-hover-border: var(--kb-primary-hover);--vp-button-brand-hover-text: #fff;--vp-button-brand-hover-bg: var(--kb-primary-hover);--vp-button-brand-active-border: var(--kb-primary-active);--vp-button-brand-active-text: #fff;--vp-button-brand-active-bg: var(--kb-primary-active)}.dark{--vp-c-brand-1: var(--kb-primary);--vp-c-brand-2: var(--kb-primary-hover);--vp-c-brand-3: var(--kb-primary-active);--vp-c-brand-soft: var(--kb-primary-bg);--vp-c-bg: var(--kb-bg);--vp-c-bg-soft: var(--kb-bg-soft);--vp-c-bg-mute: var(--kb-bg-mute);--vp-c-bg-alt: var(--kb-bg-sidebar);--vp-c-text-1: var(--kb-text-1);--vp-c-text-2: var(--kb-text-2);--vp-c-text-3: var(--kb-text-3);--vp-c-divider: var(--kb-border);--vp-c-divider-light: var(--kb-border-light);--vp-c-gutter: var(--kb-border-light)}.kb-theme{font-family:var(--kb-font-family);color:var(--kb-text-1);background:var(--kb-bg);line-height:var(--kb-line-height)}.kb-theme *{box-sizing:border-box}.kb-reading-progress{position:fixed;top:0;left:0;width:100%;height:var(--kb-progress-height);z-index:var(--kb-z-progress);background:var(--kb-bg-mute)}.kb-reading-progress__bar{height:100%;background:linear-gradient(90deg,var(--kb-primary) 0%,var(--kb-primary-hover) 100%);transition:width .1s ease-out;border-radius:0 2px 2px 0}.kb-layout{display:flex;min-height:100vh;padding-top:var(--kb-nav-height)}.kb-layout__sidebar{position:fixed;top:var(--kb-nav-height);left:0;width:var(--kb-sidebar-width);height:calc(100vh - var(--kb-nav-height));background:var(--kb-bg-sidebar);border-right:1px solid var(--kb-border-light);overflow-y:auto;overflow-x:hidden;z-index:var(--kb-z-sticky);transition:transform 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768px){.kb-layout__sidebar{transform:translate(-100%)}.kb-layout__sidebar.is-open{transform:translate(0);box-shadow:var(--kb-shadow-3)}.kb-layout__main{margin-left:0;max-width:100%;padding:var(--kb-space-md)}}.kb-navbar{position:fixed;top:0;left:0;right:0;height:var(--kb-nav-height);background:var(--kb-bg);border-bottom:1px solid var(--kb-border-light);display:flex;align-items:center;padding:0 var(--kb-space-lg);z-index:calc(var(--kb-z-sticky) + 1);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#ffffffe6}.dark .kb-navbar{background:#1a1a1ae6}.kb-navbar__logo{display:flex;align-items:center;gap:var(--kb-space-sm);font-size:var(--kb-font-size-lg);font-weight:600;color:var(--kb-text-1);text-decoration:none}.kb-navbar__logo img{height:28px;width:auto}.kb-navbar__search{flex:1;max-width:400px;margin:0 auto}.kb-navbar__actions{display:flex;align-items:center;gap:var(--kb-space-md)}.kb-tree-nav{padding:var(--kb-space-md)}.kb-tree-nav__item{display:flex;align-items:center;padding:var(--kb-space-sm) var(--kb-space-md);margin:2px 0;border-radius:var(--kb-radius-md);color:var(--kb-text-2);font-size:var(--kb-font-size-sm);cursor:pointer;transition:all var(--kb-transition-fast);text-decoration:none}.kb-tree-nav__item:hover{background:var(--kb-bg-hover);color:var(--kb-text-1)}.kb-tree-nav__item.is-active{background:var(--kb-primary-bg);color:var(--kb-primary);font-weight:500}.kb-tree-nav__item.is-active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:16px;background:var(--kb-primary);border-radius:0 2px 2px 0}.kb-tree-nav__icon{width:16px;height:16px;margin-right:var(--kb-space-sm);opacity:.6}.kb-tree-nav__arrow{margin-left:auto;width:16px;height:16px;transition:transform 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h3{font-size:var(--kb-font-size-xl)}.kb-content h4{font-size:var(--kb-font-size-lg)}.kb-content p{margin:var(--kb-space-md) 0}.kb-content a{color:var(--kb-text-link);text-decoration:none;transition:color var(--kb-transition-fast)}.kb-content a:hover{color:var(--kb-text-link-hover);text-decoration:underline}.kb-content ul,.kb-content ol{padding-left:var(--kb-space-lg);margin:var(--kb-space-md) 0}.kb-content li{margin:var(--kb-space-sm) 0}.kb-content blockquote{margin:var(--kb-space-md) 0;padding:var(--kb-space-md) var(--kb-space-lg);border-left:4px solid var(--kb-primary);background:var(--kb-bg-soft);border-radius:0 var(--kb-radius-md) var(--kb-radius-md) 0;color:var(--kb-text-2)}.kb-content code{font-family:var(--kb-font-mono);font-size:.9em;padding:2px 6px;background:var(--kb-bg-code);border-radius:var(--kb-radius-sm);color:var(--kb-error)}.kb-content pre{margin:var(--kb-space-md) 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var(--kb-border);border-radius:var(--kb-radius-xl);padding:var(--kb-space-xl);text-align:center;box-shadow:var(--kb-shadow-card)}.kb-paywall__icon{font-size:48px;margin-bottom:var(--kb-space-md)}.kb-paywall__title{font-size:var(--kb-font-size-xl);font-weight:600;color:var(--kb-text-1);margin-bottom:var(--kb-space-sm)}.kb-paywall__desc{color:var(--kb-text-2);margin-bottom:var(--kb-space-lg)}.kb-paywall__price{margin-bottom:var(--kb-space-lg)}.kb-paywall__price-current{font-size:var(--kb-font-size-3xl);font-weight:700;color:var(--kb-error)}.kb-paywall__price-original{font-size:var(--kb-font-size-base);color:var(--kb-text-3);text-decoration:line-through;margin-left:var(--kb-space-sm)}.kb-paywall__btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--kb-space-sm);padding:var(--kb-space-md) 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