:root{--blue:#002654;--white:#FFFFFF;--red:#ED2939;--text:#1a1a1a;--text-secondary:#666;--bg:#fff;--bg-secondary:#f9f9f9;--border:#e5e5e5;--shadow:0 2px 8px rgba(0,0,0,0.04);--radius:8px;--max-width:1200px;--serif:-apple-system-ui-serif,ui-serif,Georgia,serif;--sans:-apple-system,BlinkMacSystemFont,sans-serif}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--sans);color:var(--text);line-height:1.6;background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}::selection{background:var(--blue);color:var(--white)}a{color:var(--blue);text-decoration:none;transition:opacity .2s}a:hover{opacity:.8}h1,h2,h3,h4,h5,h6{font-family:var(--serif);font-weight:400;line-height:1.2;color:var(--text)}h1{font-size:2.5rem;margin-bottom:1.5rem}h2{font-size:2rem;margin:3rem 0 1.5rem}h3{font-size:1.5rem;margin:2rem 0 1rem}p{margin-bottom:1.5rem}img{max-width:100%;height:auto;display:block}.container{max-width:var(--max-width);margin:0 auto;padding:0 1.5rem}.header{border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--bg);z-index:100}.header-content{display:flex;align-items:center;justify-content:space-between;padding:1rem 0}.logo{font-size:1.25rem;font-weight:500;color:var(--text);display:flex;align-items:center;gap:.5rem}.flag{display:inline-flex;gap:2px}.flag span{width:8px;height:24px;display:block}.flag .blue{background:var(--blue)}.flag .white{background:var(--white)}.flag .red{background:var(--red)}.nav{display:flex;gap:2rem;font-size:.9375rem}.hero{padding:4rem 0;background:var(--bg-secondary);text-align:center}.hero h1{font-size:3rem;margin-bottom:1rem}.hero p{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto}.content{padding:4rem 0}.content-wrapper{max-width:800px;margin:0 auto}.content h2{position:relative;padding-bottom:1rem;margin-bottom:2rem}.content h2:after{content:'';position:absolute;bottom:0;left:0;width:60px;height:3px;background:linear-gradient(90deg,var(--blue) 33.33%,var(--white) 33.33%,var(--white) 66.66%,var(--red) 66.66%)}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem;margin-top:3rem}.card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;transition:transform .2s,box-shadow .2s}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.card h3{margin-bottom:1rem}.card p{color:var(--text-secondary);font-size:.9375rem;margin-bottom:1rem}.card-link{font-weight:500;display:inline-flex;align-items:center;gap:.5rem}.footer{background:var(--bg-secondary);border-top:1px solid var(--border);padding:3rem 0;margin-top:6rem}.footer-content{text-align:center;font-size:.875rem;color:var(--text-secondary)}.footer-links{display:flex;justify-content:center;gap:2rem;margin-top:1rem}.chapter-nav{display:flex;justify-content:space-between;margin:3rem 0;padding-top:2rem;border-top:1px solid var(--border)}.chapter-nav a{display:flex;align-items:center;gap:.5rem;padding:1rem 1.5rem;background:var(--bg-secondary);border-radius:var(--radius);transition:all .2s}.chapter-nav a:hover{background:var(--border)}.chapter-nav .prev{margin-right:auto}.chapter-nav .next{margin-left:auto}.toc{background:var(--bg-secondary);border-radius:var(--radius);padding:2rem;margin-bottom:3rem}.toc h3{margin-bottom:1rem}.toc ul{list-style:none}.toc li{padding:.5rem 0}.toc a{display:block;padding:.25rem 0;border-left:3px solid transparent;padding-left:1rem;transition:all .2s}.toc a:hover{border-color:var(--blue);padding-left:1.5rem}.breadcrumb{font-size:.875rem;color:var(--text-secondary);margin-bottom:2rem}.breadcrumb a{color:var(--text-secondary)}.breadcrumb span{margin:0 .5rem}@media(max-width:768px){html{font-size:15px}h1{font-size:2rem}.hero h1{font-size:2rem}.nav{gap:1rem;font-size:.875rem}.grid{grid-template-columns:1fr;gap:1.5rem}.container{padding:0 1rem}}