:root{--color-primary:#1a73e8;--color-primary-dark:#1557b0;--color-secondary:#34a853;--color-text:#202124;--color-bg:#fff;--color-bg-light:#f5f7fa;--color-border:#e8e8e8;--color-border-light:#f0f0f0;--color-text-secondary:#666;--color-text-muted:#999;--color-primary-light:#e6f7ff;--space-sm:0.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:1.5rem;--space-2xl:2rem;--radius-sm:4px;--radius-md:8px;--radius-lg:8px;--shadow-sm:0 1px 2px rgba(0,0,0,0.05);--container-xl:1200px;--transition-fast:0.2s}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.6;color:var(--color-text)}.container{max-width:var(--container-xl);margin:0 auto;padding:0 var(--space-lg)}.site-header{position:sticky;top:0;z-index:300;background:#fff;box-shadow:var(--shadow-sm)}.header-main{padding:var(--space-md)0}.header-inner{display:flex;align-items:center;gap:var(--space-lg)}.site-logo{display:flex;align-items:center;gap:var(--space-sm)}.logo-icon{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));border-radius:var(--radius-md)}.logo-text{font-size:1.5rem;font-weight:700}.main-nav{flex:1}.nav-list{display:flex;gap:.5rem}.nav-link{display:block;padding:var(--space-sm)var(--space-md);color:var(--color-text);font-weight:500}a{color:inherit;text-decoration:none}ul,ol,li{list-style:none;margin:0;padding:0}h1,h2,h3,h4,h5,h6{margin:0;font-weight:inherit}p{margin:0}button{background:0 0;border:none;padding:0;cursor:pointer}input,textarea{border:none;outline:none;background:0 0}img{border:none}.main-container{background:#f5f7fa;padding:20px 0 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