*{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 80px 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:13px;font-weight:400;color:var(--muted);text-decoration:none;padding:3px 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}
        .nav-back{font-family:'Inter',sans-serif;font-size:11px;color:var(--light);text-decoration:none;display:block;margin-bottom:18px;padding:3px 0;transition:color .2s}
        .nav-back:hover{color:var(--muted)}
        .nav-sep{height:1px;background:var(--line);margin:14px 0}
        .nav-section-label{font-family:'Inter',sans-serif;font-size:10px;text-transform:uppercase;letter-spacing:.08em;color:var(--light);padding:3px 0;display:block}
        .nav-section a{display:block;font-family:'Inter',sans-serif;font-size:12px;color:var(--light);text-decoration:none;padding:2px 0;transition:color .2s}
        .nav-section a:hover{color:var(--muted)}
        .divider{width:1px;background:var(--line);flex-shrink:0}
        main{flex:1;padding-left:48px;max-width:680px}

        .page-meta{display:flex;align-items:center;gap:10px;margin-bottom:8px}
        .page-series{font-family:'Inter',sans-serif;font-size:11px;color:var(--light);text-transform:uppercase;letter-spacing:.08em}
        .page-dot{width:3px;height:3px;background:var(--light);border-radius:50%;flex-shrink:0}
        .page-num{font-family:'Inter',sans-serif;font-size:11px;color:var(--light)}
        .page-title{font-size:22px;font-weight:600;color:var(--dark);line-height:1.3;margin-bottom:10px}
        .page-desc{font-size:16px;color:var(--muted);line-height:1.7;margin-bottom:36px;max-width:620px}

        .section{margin-bottom:44px}
        .section-label{font-family:'Inter',sans-serif;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--light);margin-bottom:10px}
        h2.section-title{font-size:18px;font-weight:600;color:var(--dark);margin-bottom:12px;line-height:1.35}
        .prose p{font-size:16px;color:#3a3a3a;line-height:1.85;margin-bottom:14px}
        .prose p:last-child{margin-bottom:0}
        .prose strong{color:var(--dark);font-weight:600}
        .prose a{color:var(--blue)}

        /* ── PRODUCT TREE ───────────────────────────────────── */
        .tree-wrap{margin:20px 0 0;border:1px solid var(--line)}
        .tree-hint{padding:14px 18px 0;font-family:'Inter',sans-serif;font-size:12px;color:var(--light)}

        /* Category row */
        .cat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);margin-top:14px}
        .cat-tile{
            background:#fff;padding:16px 12px 14px;cursor:pointer;transition:background .15s;text-align:center
        }
        .cat-tile:hover{background:#fafafa}
        .cat-tile.cactive{background:var(--dark)}
        .cat-icon{font-size:22px;margin-bottom:6px}
        .cat-name{font-family:'Inter',sans-serif;font-size:12px;font-weight:600;color:var(--dark);line-height:1.3;transition:color .15s}
        .cat-sub{font-family:'Inter',sans-serif;font-size:10px;color:var(--light);margin-top:2px;transition:color .15s}
        .cat-tile.cactive .cat-name,.cat-tile.cactive .cat-sub{color:#fff}
        .cat-tile.cactive .cat-sub{color:rgba(255,255,255,.5)}

        /* Sub-products within category */
        .cat-products{border-top:1px solid var(--line);display:none;padding:0}
        .cat-products.visible{display:block}
        .cat-prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line)}
        .prod-tile{
            background:#fff;padding:12px 14px;cursor:pointer;transition:background .15s
        }
        .prod-tile:hover{background:#fafafa}
        .prod-tile.pactive{background:var(--dark)}
        .prod-name{font-family:'Inter',sans-serif;font-size:12px;font-weight:600;color:var(--dark);margin-bottom:2px;transition:color .15s}
        .prod-tag{display:inline-block;font-family:'Inter',sans-serif;font-size:9px;padding:1px 6px;border:1px solid var(--line);color:var(--light);text-transform:uppercase;letter-spacing:.04em;transition:all .15s}
        .prod-tile.pactive .prod-name{color:#fff}
        .prod-tile.pactive .prod-tag{border-color:rgba(255,255,255,.2);color:rgba(255,255,255,.5)}

        /* Product detail */
        .prod-detail{border-top:1px solid var(--line);display:none;padding:20px 18px}
        .prod-detail.visible{display:block}
        .pd-name{font-family:'Inter',sans-serif;font-size:15px;font-weight:600;color:var(--dark);margin-bottom:4px}
        .pd-purpose{font-family:'Inter',sans-serif;font-size:13px;color:var(--muted);line-height:1.65;margin-bottom:16px}
        .pd-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
        .pd-col-label{font-family:'Inter',sans-serif;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:6px}
        .pd-list{list-style:none;padding:0}
        .pd-list li{font-family:'Inter',sans-serif;font-size:12px;color:#3a3a3a;padding:3px 0;border-bottom:1px solid #f5f5f5;line-height:1.5}
        .pd-list li:last-child{border-bottom:none}
        .pd-list li::before{content:'· ';color:var(--light)}
        .pd-tags{display:flex;flex-wrap:wrap;gap:6px}
        .pd-badge{font-family:'Inter',sans-serif;font-size:11px;padding:3px 10px;border:1px solid}
        .pd-badge.linear{background:var(--blue-bg);color:var(--blue);border-color:rgba(42,108,182,.2)}
        .pd-badge.nonlinear{background:var(--amber-bg);color:var(--amber);border-color:rgba(138,90,16,.2)}
        .pd-badge.otc{background:var(--purple-bg);color:var(--purple);border-color:rgba(107,70,168,.2)}
        .pd-badge.listed{background:var(--teal-bg);color:var(--teal);border-color:rgba(26,122,90,.2)}
        .pd-badge.cash{background:#f5f5f5;color:#555;border-color:#ddd}
        .pd-next{font-family:'Inter',sans-serif;font-size:12px;color:var(--muted);margin-top:14px;padding:10px 12px;background:#f9f9f9;border-left:2px solid var(--line);line-height:1.65}
        .pd-next a{color:var(--blue)}

        /* ── LINEAR vs NON-LINEAR ───────────────────────────── */
        .dim-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);margin:20px 0 0}
        .dim-head{padding:12px 16px;font-family:'Inter',sans-serif;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.06em}
        .dim-head.lin{background:var(--blue-bg);color:var(--blue)}
        .dim-head.nlin{background:var(--amber-bg);color:var(--amber)}
        .dim-cell{background:#fff;padding:14px 16px}
        .dim-cell ul{list-style:none;padding:0}
        .dim-cell ul li{font-family:'Inter',sans-serif;font-size:12px;color:#3a3a3a;padding:4px 0;border-bottom:1px solid #f5f5f5;line-height:1.5}
        .dim-cell ul li:last-child{border-bottom:none}
        .dim-cell ul li::before{content:'· ';color:var(--light)}

        /* ── OTC vs LISTED ──────────────────────────────────── */
        .venue-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);margin:20px 0 0}
        .venue-head{padding:12px 16px;font-family:'Inter',sans-serif;font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.06em}
        .venue-head.otc{background:var(--purple-bg);color:var(--purple)}
        .venue-head.listed{background:var(--teal-bg);color:var(--teal)}
        .venue-cell{background:#fff;padding:14px 16px}
        .venue-cell ul{list-style:none;padding:0}
        .venue-cell ul li{font-family:'Inter',sans-serif;font-size:12px;color:#3a3a3a;padding:4px 0;border-bottom:1px solid #f5f5f5;line-height:1.5}
        .venue-cell ul li:last-child{border-bottom:none}
        .venue-cell ul li::before{content:'· ';color:var(--light)}

        /* ── NEED MATCHER ───────────────────────────────────── */
        .need-wrap{margin:20px 0 0;border:1px solid var(--line)}
        .need-list{list-style:none;padding:0}
        .need-item{display:flex;align-items:flex-start;gap:0;border-bottom:1px solid var(--line);cursor:pointer;transition:background .15s}
        .need-item:last-child{border-bottom:none}
        .need-item:hover{background:#fafafa}
        .need-q{flex:1;padding:14px 18px;font-family:'Inter',sans-serif;font-size:13px;color:var(--dark);line-height:1.55}
        .need-q strong{font-weight:600}
        .need-toggle{padding:14px 16px 14px 0;font-family:'Inter',sans-serif;font-size:16px;color:var(--light);flex-shrink:0;user-select:none;transition:transform .2s}
        .need-answer{display:none;padding:0 18px 14px;font-family:'Inter',sans-serif;font-size:12px;color:var(--muted);line-height:1.7;border-top:1px solid #f5f5f5}
        .need-answer span{display:inline-block;background:var(--dark);color:#fff;font-weight:600;padding:2px 8px;font-size:11px;margin-right:4px}
        .need-item.nopen .need-toggle{transform:rotate(45deg);color:var(--dark)}
        .need-item.nopen .need-answer{display:block}

        /* TAKEAWAYS */
        .takeaway-box{border:1px solid var(--line);padding:20px 22px;margin:8px 0 0;background:#fafafa}
        .tb-label{font-family:'Inter',sans-serif;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--light);margin-bottom:12px}
        .takeaway-box ul{list-style:none;padding:0}
        .takeaway-box ul li{font-family:'Inter',sans-serif;font-size:13px;color:#3a3a3a;padding:5px 0;border-bottom:1px solid var(--line);line-height:1.6}
        .takeaway-box ul li:last-child{border-bottom:none}
        .takeaway-box ul li::before{content:'✓  ';color:var(--teal);font-weight:600}

        .page-nav{display:flex;justify-content:space-between;margin-top:52px;padding-top:18px;border-top:1px solid var(--line)}
        .page-nav a{font-family:'Inter',sans-serif;font-size:13px;color:var(--muted);text-decoration:none;border:1px solid var(--line);padding:8px 16px;transition:all .2s}
        .page-nav a:hover{color:var(--dark);border-color:var(--muted)}
        .pn-label{font-size:10px;color:var(--light);display:block;margin-bottom:1px}
        .footer{margin-top:36px;padding-top:16px;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}
            .nav-back,.nav-sep,.nav-section{display:none}
            .divider{width:100%;height:1px}
            main{padding-left:0;padding-top:28px;max-width:100%}
            .cat-row{grid-template-columns:1fr 1fr}
            .cat-prod-grid{grid-template-columns:1fr 1fr}
            .pd-grid{grid-template-columns:1fr}
            .dim-grid,.venue-grid{grid-template-columns:1fr}
        }
    
        /* Ortak öğrenme, kaynak ve erişilebilirlik katmanı */
        :focus-visible{outline:3px solid var(--blue);outline-offset:3px}
        .learning-goals{border-left:3px solid var(--teal);background:var(--teal-bg);padding:13px 16px;margin:-18px 0 36px;font-family:'Inter',sans-serif;color:#2f4b41}
        .learning-goals-title{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.09em;color:var(--teal);margin-bottom:6px}
        .learning-goals ul{margin:0;padding-left:18px}
        .learning-goals li{font-size:12px;line-height:1.6;margin:3px 0}
        .source-note{margin:42px 0 0;padding:14px 16px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-family:'Inter',sans-serif;font-size:11px;color:var(--muted);line-height:1.65}
        .source-note strong{color:var(--dark);font-weight:600}
        .source-note ul{margin:7px 0 5px;padding-left:18px}
        .source-note a{color:var(--blue);text-underline-offset:2px}
        .source-note .scope-note{margin-top:6px}
        canvas{max-width:100%}
        @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}

    

            .cl4-wrap{border:1px solid var(--line);margin:20px 0 0}
            .cl4-hint{padding:14px 18px 0;font-family:'Inter',sans-serif;font-size:12px;color:var(--light)}
            .cl4-rung{display:flex;align-items:center;gap:14px;padding:14px 18px;border-bottom:1px solid var(--line);cursor:pointer;transition:background .15s;background:#fff}
            .cl4-rung:hover{background:#fafafa}
            .cl4-rung.cl4active{background:#1a1a1a}
            .cl4-step{font-family:'Inter',sans-serif;font-size:11px;font-weight:700;color:#fff;min-width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}
            .cl4-rung:nth-of-type(1) .cl4-step{background:#1a7a5a}
            .cl4-rung:nth-of-type(2) .cl4-step{background:#2a6cb6}
            .cl4-rung:nth-of-type(3) .cl4-step{background:#8a5a10}
            .cl4-rung:nth-of-type(4) .cl4-step{background:#a04020}
            .cl4-rung:nth-of-type(5) .cl4-step{background:#6b46a8}
            .cl4-mid{flex:1}
            .cl4-t{font-family:'Inter',sans-serif;font-size:13px;font-weight:600;color:var(--dark);transition:color .15s}
            .cl4-s{font-family:'Inter',sans-serif;font-size:11.5px;color:var(--muted);line-height:1.5;margin-top:2px;transition:color .15s}
            .cl4-rung.cl4active .cl4-t{color:#fff}
            .cl4-rung.cl4active .cl4-s{color:rgba(255,255,255,.6)}
            .cl4-lvl{font-family:'Inter',sans-serif;font-size:10px;font-weight:600;padding:3px 8px;border:1px solid var(--line);color:var(--muted);flex-shrink:0;text-transform:uppercase;letter-spacing:.04em}
            .cl4-rung.cl4active .cl4-lvl{border-color:rgba(255,255,255,.3);color:rgba(255,255,255,.7)}
            .cl4-detail{border:1px solid var(--line);border-top:none;display:none;padding:18px;background:#fff}
            .cl4-detail.cl4vis{display:block}
            .cl4-dgrid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:12px}
            .cl4-dlabel{font-family:'Inter',sans-serif;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:5px}
            .cl4-dval{font-family:'Inter',sans-serif;font-size:12.5px;color:#3a3a3a;line-height:1.6}
            .cl4-note{font-family:'Inter',sans-serif;font-size:12.5px;color:#3a3a3a;padding:11px 14px;background:var(--purple-bg);border-left:3px solid var(--purple);line-height:1.6}
            .cl4-note strong{color:var(--purple);font-weight:600}
            @media(max-width:768px){.cl4-dgrid{grid-template-columns:1fr}.cl4-lvl{display:none}}