*{margin:0;padding:0;box-sizing:border-box}
        :root{
            --bg:#fff;--text:#333;--muted:#999;--light:#b5b5b5;--line:#e5e5e5;--dark:#1a1a1a;
            --blue:#2a6cb6;--blue-bg:#f0f5fb;
            --teal:#1a7a5a;--teal-bg:#edf7f2;
            --amber:#8a5a10;--amber-bg:#fdf5e6;
            --coral:#a04020;--coral-bg:#fdf0eb;
            --purple:#6b46a8;--purple-bg:#f4f0fa
        }
        ::selection{background:#d5d5d5;color:var(--dark)}
        html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
        body{font-family:'Source Serif 4',Georgia,serif;background:var(--bg);color:var(--text);line-height:1.75;font-size:17px;-webkit-font-smoothing:antialiased}

        .layout{display:flex;min-height:100vh;max-width:1060px;margin:0 auto;padding:56px 32px 56px 0}
        nav{position:sticky;top:56px;align-self:flex-start;min-width:150px;padding:0 36px 0 32px;text-align:right}
        nav a{display:block;font-family:'Inter',sans-serif;font-size:14px;font-weight:400;color:var(--muted);text-decoration:none;padding:4px 0;transition:color .2s}
        nav a:hover{color:var(--dark)}
        nav a.active{color:var(--dark);font-weight:500;text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
        .divider{width:1px;background:var(--line);flex-shrink:0}
        main{flex:1;padding-left:48px;max-width:700px}

        .page-label{font-family:'Inter',sans-serif;font-size:13px;color:var(--light);margin-bottom:2px}
        .page-name{font-size:22px;font-weight:400;color:var(--dark);margin-bottom:12px}
        .page-desc{font-size:16px;color:var(--muted);margin-bottom:28px;line-height:1.7}

        .overview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-bottom:14px}
        .overview-cell{background:var(--bg);padding:18px 14px;text-align:center}
        .overview-cell .num{font-family:'Source Serif 4',serif;font-size:28px;font-weight:600;color:var(--dark);line-height:1.1;margin-bottom:4px}
        .overview-cell .lbl{font-family:'Inter',sans-serif;font-size:10px;color:var(--light);text-transform:uppercase;letter-spacing:.08em}

        .roadmap-note{font-family:'Inter',sans-serif;font-size:13px;color:#1a4a7a;margin-bottom:38px;line-height:1.65;padding:12px 16px;background:var(--blue-bg);border-left:2px solid var(--blue)}

        .phase{margin-bottom:36px}
        .phase-header{display:flex;align-items:center;gap:12px;margin-bottom:5px}
        .phase-num{font-family:'Inter',sans-serif;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.12em;padding:3px 10px;border:1px solid rgba(42,108,182,.3);color:var(--blue);background:var(--blue-bg)}
        .phase-title{font-family:'Inter',sans-serif;font-size:13px;font-weight:500;color:var(--dark)}
        .phase-question{font-family:'Source Serif 4',serif;font-size:13px;font-style:italic;color:var(--muted);margin-bottom:8px}
        .phase-desc{font-size:15px;color:var(--muted);margin-bottom:12px;line-height:1.65}

        a.module{border:1px solid var(--line);padding:14px 16px;margin-bottom:4px;display:flex;align-items:flex-start;gap:12px;transition:border-color .2s;text-decoration:none;background:#fff}
        a.module:hover{border-color:rgba(42,108,182,.4)}
        .module-num{font-family:'Inter',sans-serif;font-size:10px;font-weight:600;color:#fff;background:var(--blue);min-width:24px;height:24px;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}
        .module-body{flex:1}
        .module-title{font-family:'Inter',sans-serif;font-size:13px;font-weight:600;color:var(--dark);margin-bottom:2px}
        .module-desc{font-family:'Inter',sans-serif;font-size:11px;color:var(--muted);line-height:1.6}
        .module-tags{margin-top:6px;display:flex;flex-wrap:wrap;gap:3px}
        .module-arrow{font-size:13px;color:var(--light);flex-shrink:0;margin-top:4px;transition:color .2s}
        a.module:hover .module-title{color:var(--blue)}
        a.module:hover .module-arrow{color:var(--muted)}

        .tag{display:inline-block;font-family:'Inter',sans-serif;font-size:9px;padding:2px 8px;border:1px solid transparent;text-transform:uppercase;letter-spacing:.04em}
        .tag-fin{background:var(--teal-bg);color:var(--teal)}
        .tag-stat{background:var(--blue-bg);color:var(--blue)}
        .tag-math{background:var(--purple-bg);color:var(--purple)}
        .tag-ml{background:var(--amber-bg);color:var(--amber)}
        .tag-warn{background:var(--coral-bg);color:var(--coral)}

        .note{border-left:3px solid var(--blue);padding:10px 16px;margin:20px 0;font-size:15px;background:var(--blue-bg);color:#1a4a7a}
        .footer{margin-top:44px;padding-top:18px;border-top:1px solid var(--line);font-family:'Inter',sans-serif;font-size:12px;color:var(--light)}

        @media(max-width:768px){
            .layout{flex-direction:column;padding:28px 20px}
            nav{position:static;text-align:left;min-width:auto;padding:0 0 24px 0;display:flex;flex-wrap:wrap;gap:3px 14px}
            nav a{display:inline}
            .divider{width:100%;height:1px}
            main{padding-left:0;padding-top:28px;max-width:100%}
        }
    
        .skip-link{position:absolute;left:-9999px;top:8px;background:var(--dark);color:#fff;padding:8px 12px;z-index:10;font-family:'Inter',sans-serif}
        .skip-link:focus{left:8px}
        .reading-guide{border:1px solid var(--line);padding:16px 18px;margin:0 0 34px;font-family:'Inter',sans-serif;font-size:13px;line-height:1.65}
        .reading-guide ol{margin:8px 0 0 20px}.reading-guide strong{color:var(--dark)}
        .source-note{border-top:1px solid var(--line);padding-top:16px;margin-top:34px;font-family:'Inter',sans-serif;font-size:12px;line-height:1.65;color:var(--muted)}
        .source-note a{color:var(--blue)}
        a:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
        @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition-duration:.01ms!important}}