.header{position:sticky;top:0;z-index:50;width:100%;background:var(--surface);border-bottom:1px solid var(--line)}.header__container{display:flex;align-items:center;justify-content:space-between;min-height:52px;padding:0 1rem;margin:0 auto}@media(min-width:768px){.header__container{padding:0 1.5rem}}.header__container--standard{max-width:1400px}.header__container--full{max-width:1600px}.header__logo{display:flex;align-items:center;gap:.5rem;text-decoration:none;transition:opacity .2s ease;flex-shrink:0}.header__logo:hover{opacity:.8}.header__logo-img{display:block;width:2.25rem;height:2.25rem;-o-object-fit:contain;object-fit:contain;flex-shrink:0;border-radius:.25rem}@media(max-width:479px){.header__logo-img{width:1.75rem;height:1.75rem}}.header__logo-text{font-family:var(--font-serif);font-optical-sizing:auto;letter-spacing:-.01em;font-size:1.0625rem;font-weight:500;color:var(--text-primary)}@media(max-width:479px){.header__logo-text{display:none}}.header__center{display:none;flex-direction:column;align-items:center;text-align:center}@media(min-width:640px){.header__center{display:flex}}.header__title{font-size:.625rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin-bottom:.125rem}.header__subtitle{font-size:.75rem;font-weight:500;color:var(--text-secondary)}.header__controls{display:flex;align-items:center;gap:.5rem}.header__theme-btn{display:inline-flex;align-items:center;justify-content:center;width:1.875rem;height:1.875rem;padding:0;border-radius:.5rem;background-color:rgba(0,0,0,0);border:none;cursor:pointer;transition:background-color .15s ease;font-size:.875rem}.header__theme-btn:hover{background-color:var(--line-2)}.header__theme-icon{line-height:1}.header__theme-icon--moon,[data-theme=light] .header__theme-icon--sun{display:none}[data-theme=light] .header__theme-icon--moon{display:inline}.header__user-menu{margin-left:.5rem;padding-left:1rem;border-left:1px solid var(--border)}@media(max-width:479px){.header__user-menu{margin-left:0;padding-left:0;border-left:none}}.header__action-btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 1rem;border-radius:.375rem;background-color:var(--accent);color:var(--accent-ink);font-size:.875rem;font-weight:600;text-decoration:none;transition:opacity .2s ease,transform .1s ease;border:none;cursor:pointer}.header__action-btn:hover{opacity:.9;transform:translateY(-1px)}.header__action-btn:active{transform:translateY(0)}.header__action-btn .icon{width:1.25rem;height:1.25rem;flex-shrink:0}@media(max-width:639px){.header__action-btn{padding:.5rem}.header__action-btn-text{display:none}}