.main-header{position:fixed;top:0;left:0;width:100%;padding:2rem 4rem;z-index:1000;display:flex;justify-content:space-between;align-items:center;transition:background-color .3s ease;background-color:var(--color-light);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--color-secondary)}.header-logo{font-family:var(--font-family-heading);font-size:1.5rem;font-weight:700;letter-spacing:.1em;color:var(--color-text);text-decoration:none;text-transform:uppercase}.header-logo-img{display:block;height:40px;width:auto;-o-object-fit:contain;object-fit:contain}@media (max-width: 768px){.header-logo-img{height:32px}}.theme-toggle{margin-left:1.5rem;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--color-secondary);border-radius:9999px;background:transparent;color:var(--color-text);cursor:pointer;transition:color .2s ease,border-color .2s ease,background-color .2s ease,transform .2s ease}.theme-toggle:hover{color:var(--color-background);background-color:var(--color-accent);border-color:var(--color-accent)}.theme-toggle:active{transform:scale(.96)}.theme-toggle-icon{width:20px;height:20px;animation:themeIconEnter .32s ease both}@keyframes themeIconEnter{0%{opacity:0;transform:rotate(-20deg) scale(.96)}to{opacity:1;transform:rotate(0) scale(1)}}@media (prefers-reduced-motion: reduce){.theme-toggle-icon{animation:none!important}.theme-toggle:active{transform:none}}.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.header-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:2.5rem}.header-nav a{font-family:var(--font-family-body);font-size:1rem;font-weight:400;letter-spacing:.05em;color:var(--color-text);text-decoration:none;text-transform:uppercase;position:relative;transition:color .3s ease}.header-nav a:after{content:"";position:absolute;bottom:-5px;left:0;width:0;height:2px;background-color:var(--color-accent);transition:width .3s ease}.header-nav a:hover:after{width:100%}.menu-button{display:none;margin-left:1rem;width:40px;height:40px;border:1px solid var(--color-secondary);border-radius:9999px;background:transparent;color:var(--color-text);cursor:pointer;align-items:center;justify-content:center;transition:color .2s ease,border-color .2s ease,background-color .2s ease}.menu-button:hover{background-color:var(--color-accent);color:var(--color-background);border-color:var(--color-accent)}.menu-icon{width:22px;height:22px}@media (max-width: 768px){.menu-button{display:inline-flex}.header-nav{position:absolute;top:100%;left:0;right:0;display:block;overflow:hidden;max-height:0;opacity:0;transform:translateY(-6px);transition:max-height .28s ease,opacity .2s ease,transform .28s ease;will-change:max-height,opacity,transform;background:var(--color-light);border-bottom:1px solid var(--color-secondary);box-shadow:0 6px 20px #00000014;z-index:1000}.header-nav.open{max-height:60vh;opacity:1;transform:translateY(0)}.header-nav ul{flex-direction:column;padding:1rem 1.5rem;gap:.75rem}.header-nav a{font-size:.95rem}.nav-theme{padding-top:.25rem}.theme-toggle{margin-left:0;width:34px;height:34px}}@media (prefers-reduced-motion: reduce){.header-nav{transition:none;transform:none}}@media (min-width: 769px){.header-nav{position:static;display:block;background:transparent;border:0;box-shadow:none}}@media (max-width: 768px){.main-header{flex-direction:row;align-items:center;justify-content:space-between;padding:1rem 1.25rem}.menu-button{margin-left:auto}.header-nav ul{margin-top:0;gap:1rem}}.header-nav a.active,.header-nav a[aria-current=page]{color:var(--color-accent)}[data-theme=dark] .header-nav a:after{background-color:var(--color-accent);opacity:.95}[data-theme=dark] .header-nav a:hover,[data-theme=dark] .header-nav a.active,[data-theme=dark] .header-nav a[aria-current=page]{color:var(--color-accent)}