:root{--green:#115740;--blue:#2E6DA4;--s1:#2E6DA4;--s2:#1A7A8A;--s3:#5B4A8A;--bg:#f5f7fa;--card:#ffffff;--text:#1a1a2e;--text-secondary:#888888;--text-tertiary:#bbbbbb;--border:#e0e4ec;--font-sans:'Inter', system-ui, sans-serif;--font-serif:'Source Serif 4', Georgia, serif;--radius:10px;--shadow:0 1px 4px rgba(0,0,0,0.06);--container:1080px}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:17px;scroll-behavior:smooth}body{font-family:var(--font-serif);font-size:1rem;line-height:1.7;color:var(--text);background:var(--bg)}img{max-width:100%;display:block}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{font-family:var(--font-sans);font-weight:700;color:var(--text);line-height:1.3}.container{max-width:var(--container);margin:0 auto;padding:0 24px}.page-content{padding:40px 0 80px}.stack{display:flex;flex-direction:column}.stack-16{gap:16px}.stack-24{gap:24px}.stack-32{gap:32px}.two-col{display:grid;grid-template-columns:1fr 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