.header{height:48px;padding:0 1rem;display:flex;align-items:center;gap:.5rem;background:var(--header-bg, #ffffff);color:var(--text-primary, #1f2937);justify-content:space-between;border-bottom:1px solid var(--border-primary, #e5e7eb);position:sticky;top:0;z-index:100}.nav{display:flex;flex-direction:row;align-items:center;width:100%;gap:.5rem}.nav-item{padding:0 .5rem;font-weight:600}.nav-item a{color:var(--text-primary, #1f2937);text-decoration:none}.nav-item a:hover{color:var(--accent-primary, #7c3aed)}.search-button{display:flex;align-items:center;gap:.5rem;padding:.4rem .75rem;margin-left:1rem;background:var(--bg-secondary, #f3f4f6);border:1px solid var(--border-primary, #e5e7eb);border-radius:8px;cursor:pointer;font-size:.85rem;color:var(--text-tertiary, #6b7280);transition:all .15s ease}.search-button:hover{background:var(--accent-bg, #f5f3ff);border-color:var(--border-accent, #c4b5fd);color:var(--accent-primary, #7c3aed)}.search-icon{font-size:.9rem}.search-text{color:var(--text-muted, #9ca3af)}.search-shortcut{background:var(--bg-tertiary, #e5e7eb);padding:.15rem .4rem;border-radius:4px;font-size:.7rem;font-family:system-ui;color:var(--text-tertiary, #6b7280)}.search-button:hover .search-shortcut{background:var(--accent-bg-hover, #ddd6fe);color:var(--accent-primary, #7c3aed)}.header-spacer{flex:1}.theme-toggle{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:var(--bg-secondary, #f3f4f6);border:1px solid var(--border-primary, #e5e7eb);border-radius:8px;cursor:pointer;font-size:1.1rem;transition:all .15s ease}.theme-toggle:hover{background:var(--bg-hover, #f5f3ff);border-color:var(--border-accent, #c4b5fd);transform:rotate(15deg)}.header-link{padding:.4rem .75rem;color:var(--text-secondary, #4b5563);text-decoration:none;font-size:.85rem;font-weight:500;border-radius:6px;transition:all .15s ease}.header-link:hover{background:var(--bg-hover, #f5f3ff);color:var(--accent-primary, #7c3aed)}.header-email{font-size:.8rem;color:var(--text-muted, #9ca3af);padding:0 .5rem}.header-signout{padding:.4rem .75rem;background:transparent;border:1px solid var(--error, #ef4444);border-radius:6px;color:var(--error, #ef4444);font-size:.8rem;font-weight:500;cursor:pointer;transition:all .15s ease}.header-signout:hover{background:var(--error, #ef4444);color:#fff}.header-signin{padding:.4rem .75rem;background:var(--accent-primary, #7c3aed);border-radius:6px;color:#fff;text-decoration:none;font-size:.85rem;font-weight:500;transition:all .15s ease}.header-signin:hover{background:var(--accent-secondary, #6d28d9)}