:root{--sidebar-width:240px;color-scheme:dark;--black:#000000;--white:#FFFFFF;--bg-primary:#000000;--bg-secondary:#0A0A0A;--bg-elevated:#111111;--text-primary:#FFFFFF;--text-secondary:#CFCFD6;--text-muted:#9A9AA3;--accent-primary:#A9BCE3;--accent-secondary:#C9C6F0;--accent-hover:#B8C8EB;--accent-soft:#1A1A24;--accent-border:#8FA2CC;--ai-primary:#A9BCE3;--ai-hover:#B8C8EB;--ai-soft:#1A1A24;--btn-primary:#A9BCE3;--btn-primary-hover:#B8C8EB;--btn-primary-active:#9AB0D9;--btn-primary-disabled:#3A3A3A;--btn-primary-text:#000000;--btn-secondary:#111111;--btn-secondary-hover:#1A1A1A;--btn-secondary-border:#1F1F1F;--success:#7FBFA4;--success-soft:#1A2A22;--warning:#E6C47A;--warning-soft:#2A221A;--error:#E07A7A;--error-soft:#2A1A1A;--focus-ring:#A9BCE3;--border-default:#1F1F1F;--theme-toggle-bg:#e0def8;--overlay:rgba(0,0,0,0.75);--gradient-brand:linear-gradient(135deg,#FFFFFF,#A9BCE3,#FFFFFF,#C9C6F0,#FFFFFF);--gradient-hero:radial-gradient(circle at top right,rgba(169,188,227,0.15),transparent 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.75rem;border-radius:10px;color:var(--text-secondary);font-size:.875rem;text-decoration:none;transition:all .15s ease;background:transparent;border:none;width:100%;cursor:pointer;font-family:inherit;text-align:left}.app-header-profile-item:hover{background:var(--bg-secondary);color:var(--text-primary)}.app-header-profile-item svg{flex-shrink:0;width:16px;height:16px}.app-header-profile-item--danger{color:var(--error)}.app-header-profile-item--danger:hover{background:var(--error-soft);color:var(--error)}.app-header-skeleton{width:120px;height:40px;background:var(--bg-secondary);border-radius:12px;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@media (max-width:768px){.app-header-container{padding:0 1rem}.app-header-title{font-size:.875rem}.app-header-credits-pill-label{display:none}}.theme-toggle{padding:0;border:none;background:transparent;cursor:pointer;outline:none}.theme-toggle:focus-visible{outline:2px solid 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ease;box-sizing:border-box;position:relative;overflow:visible}.header-logo{display:flex;align-items:center;gap:2px;font-size:1.25rem;font-weight:600;color:var(--text-primary);text-decoration:none;letter-spacing:.05em;transition:color .2s;white-space:nowrap}.header-logo:hover{color:var(--accent-primary)}.header-nav{position:absolute;left:50%;transform:translateX(-50%);gap:1.5rem;flex-wrap:wrap;z-index:300;pointer-events:auto}.header-actions,.header-nav{display:flex;align-items:center}.header-actions{justify-content:flex-end;gap:1rem;position:relative;z-index:50}.header-link{color:var(--text-secondary);text-decoration:none;font-size:.875rem;font-weight:500;transition:color .2s;white-space:nowrap;letter-spacing:.01em}.header-button,.header-link:hover{color:var(--text-primary)}.header-button{padding:.5rem 1rem;border:1px solid var(--btn-secondary-border);border-radius:9999px;background:var(--btn-secondary);text-decoration:none;font-size:.875rem;font-weight:500;transition:all .2s;white-space:nowrap;letter-spacing:.01em}.header-button:hover{background:var(--btn-secondary-hover);border-color:var(--accent-border)}.header-avatar{width:30px;height:30px;border-radius:50%;background:var(--accent-primary);color:var(--bg-primary);display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;border:none;cursor:pointer;transition:all .2s;flex-shrink:0;font-family:inherit}.header-avatar:hover{background:var(--accent-hover);transform:scale(1.05)}@media (max-width:768px){.header-container{grid-template-columns:1fr;gap:1rem}.header-nav{position:static;transform:none;justify-content:space-between;width:100%}}