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var(--border);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:24px;max-width:1200px;min-height:72px;margin:0 auto;padding:0 24px;display:flex}.brand{align-items:center;gap:14px;display:flex}.brand-logo{width:auto;height:42px}.brand-name{letter-spacing:.01em;color:var(--primary);font-size:1rem;font-weight:700}.brand-subtitle{color:var(--text);font-size:.95rem;line-height:1.2}.site-nav{color:var(--muted);align-items:center;gap:24px;display:flex}.site-nav a{font-size:.95rem;transition:color .2s}.site-nav a:hover{color:var(--primary-dark)}.header-actions{align-items:center;gap:14px;display:flex}.theme-toggle-btn{background:var(--surface);color:var(--text);border:1px solid var(--border);cursor:pointer;border-radius:999px;padding:10px 14px;transition:background .2s,transform 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