:root{--header-bg-light:rgba(255, 255, 255, 0.98);--header-bg-dark:rgba(15, 23, 42, 0.97);--header-border-light:rgba(226, 232, 240, 0.85);--header-border-dark:rgba(51, 65, 85, 0.7);--header-shadow-base:0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);--header-shadow-scrolled:0 4px 16px -4px rgba(0, 0, 0, 0.08), 0 2px 8px -2px rgba(0, 0, 0, 0.04);--header-shadow-strong:0 8px 32px -8px rgba(0, 0, 0, 0.12), 0 4px 16px -4px rgba(0, 0, 0, 0.06);--font-system:-apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;--text-primary-light:#0f172a;--text-secondary-light:#475569;--text-tertiary-light:#64748b;--text-primary-dark:#f8fafc;--text-secondary-dark:#cbd5e1;--text-tertiary-dark:#94a3b8;--brand-primary:#2563eb;--brand-primary-hover:#1d4ed8;--brand-primary-active:#1e40af;--brand-gradient:linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);--transition-micro:120ms cubic-bezier(0.4, 0, 0.2, 1);--transition-fast:200ms cubic-bezier(0.4, 0, 0.2, 1);--transition-smooth:300ms cubic-bezier(0.4, 0, 0.2, 1);--transition-luxe:500ms cubic-bezier(0.19, 1, 0.22, 1);--header-height-desktop:72px;--header-height-tablet:64px;--header-height-mobile:60px;--header-max-width:1600px;--header-padding-desktop:2rem;--header-padding-tablet:1.5rem;--header-padding-mobile:1rem;--z-header:1000;--z-header-dropdown:1100;--z-header-overlay:999;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px}.site-header{position:fixed;top:0;left:0;right:0;width:100%;height:var(--header-height-desktop);z-index:var(--z-header);background:var(--header-bg-light);border-bottom:1px solid var(--header-border-light);box-shadow:var(--header-shadow-base);backdrop-filter:blur(24px) saturate(180%);-webkit-backdrop-filter:blur(24px) saturate(180%);will-change:transform,box-shadow;transform:translate3d(0,0,0);backface-visibility:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:transform var(--transition-smooth),box-shadow 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1rem;min-height:44px;font-family:var(--font-system);font-size:1.125rem;font-weight:700;line-height:1.2;color:var(--text-primary-light);text-decoration:none;white-space:nowrap;border-radius:var(--radius-md);background:#fff0;cursor:pointer;transition:background var(--transition-fast),transform var(--transition-fast),color var(--transition-fast);transform:translateZ(0);will-change:transform}.header-brand:hover,.header-brand:focus-visible{background:rgb(37 99 235 / .06);color:var(--brand-primary);transform:translateX(2px)}.header-brand:active{transform:translateX(2px) scale(.98);transition-duration:var(--transition-micro)}.header-brand img,.header-brand svg{display:block;width:auto;height:32px;max-width:100%;object-fit:contain}.site-header.scrolled{height:calc(var(--header-height-desktop) - 8px);box-shadow:var(--header-shadow-scrolled);backdrop-filter:blur(32px) saturate(200%)}.site-header.hidden{transform:translate3d(0,-100%,0)}.site-header.visible{transform:translate3d(0,0,0)}.site-header.pinned{box-shadow:var(--header-shadow-strong)}.quick-action-container{position:relative;display:flex;align-items:center;margin-left:auto;gap:.75rem}.quick-action-btn{position:relative;display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;min-width:44px;min-height:44px;background:var(--brand-gradient);border:none;border-radius:var(--radius-lg);box-shadow:0 2px 8px rgb(37 99 235 / .16),0 1px 3px rgb(37 99 235 / .12),inset 0 0 0 1px rgb(255 255 255 / .15);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);cursor:pointer;transition:transform var(--transition-smooth),box-shadow var(--transition-smooth),background var(--transition-smooth);will-change:transform;transform:translateZ(0);color:#fff;overflow:hidden;z-index:100}.quick-action-btn:hover{transform:translateY(-3px) scale(1.04);box-shadow:0 8px 24px rgb(37 99 235 / 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#fff}.page-title{background:#000;border:2px solid #fff;color:#fff}.header-brand{color:#fff}.quick-task-menu{background:#000;border:2px solid #fff}.quick-task-item{color:#fff}.quick-task-item:hover{background:#fff;color:#000}}@media (prefers-reduced-transparency:reduce){.site-header{background:#fff;backdrop-filter:none}.page-title{background:#fff;backdrop-filter:none}.quick-task-menu{background:#fff;backdrop-filter:none}.quick-action-overlay{backdrop-filter:none;background:rgb(0 0 0 / .3)}}@media (prefers-reduced-transparency:reduce) and (prefers-color-scheme:dark){.site-header{background:#0f172a}.page-title{background:#1e293b}.quick-task-menu{background:#1e293b}}@media (hover:none) and (pointer:coarse){.page-title:hover{transform:none;background:rgb(255 255 255 / .95)}.header-brand:hover{transform:none;background:#fff0}.quick-action-btn:hover{transform:none}.quick-task-item:hover{transform:none}.page-title:active{background:rgb(255 255 255 / 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(height:100dvh){.quick-action-overlay{height:100dvh}}@-moz-document url-prefix(){.site-header{background:rgb(255 255 255 / .99)}.page-title{background:rgb(255 255 255 / .97)}@media (prefers-color-scheme:dark){.site-header{background:rgb(15 23 42 / .99)}.page-title{background:rgb(30 41 59 / .97)}}}[dir="rtl"] .header-left{justify-content:flex-end}[dir="rtl"] .header-right{justify-content:flex-start}[dir="rtl"] .header-center{left:auto;right:50%;transform:translate(50%,-50%)}[dir="rtl"] .header-brand:hover{transform:translateX(-2px)}[dir="rtl"] .quick-action-container{margin-left:0;margin-right:auto}[dir="rtl"] .quick-task-menu{right:auto;left:0;transform-origin:top left}[dir="rtl"] .quick-task-item::before{left:auto;right:0;border-radius:3px 0 0 3px}[dir="rtl"] .quick-task-item:hover{transform:translateX(-6px)}[dir="rtl"] .quick-task-menu::before{right:auto;left:20px}.site-header.skeleton .page-title,.site-header.skeleton .header-brand{background:linear-gradient(90deg,rgb(226 232 240 / 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