:root{--text-color:#000;--bg-color:#fff;--accent-color:#333;--light-gray:#f5f5f5;--border-color:#eaeaea;--header-height:60px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-sans);line-height:1.6;color:var(--text-color);background-color:var(--bg-color)}.site-header{position:fixed;top:0;width:100%;background-color:var(--bg-color);border-bottom:1px solid var(--border-color);z-index:1000}.main-nav{max-width:800px;margin:0 auto;padding:0 20px;height:var(--header-height);display:flex;justify-content:space-between;align-items:center}.nav-brand a{font-size:1.2rem;font-weight:500;color:var(--text-color);text-decoration:none}.nav-links a{margin-left:30px;color:var(--text-color);text-decoration:none;font-size:.9rem;transition:opacity .3s}.nav-links a:hover{opacity:.7}.nav-links a.active{font-weight:500}.home-container{margin-top:var(--header-height);min-height:calc(100vh - 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