/* CodeBobby — tutorial-page.css (FreeRTOS Deep Dive series) */

    
    .toc-label{font-family:var(--mono);font-size:.65rem;color:var(--text-dim);letter-spacing:.22em;text-transform:uppercase;margin-bottom:1.2rem;display:flex;align-items:center;gap:.5rem}.toc-label::after{content:'';flex:1;height:1px;background:var(--border)}
    .toc-list{list-style:none;display:flex;flex-direction:column;gap:.1rem}.toc-item a{font-family:var(--mono);font-size:.72rem;color:var(--text-dim);text-decoration:none;padding:.38rem .7rem;display:block;border-left:2px solid transparent;transition:all .15s}.toc-item a:hover,.toc-item a.active{color:var(--accent);border-left-color:var(--accent);background:rgba(0,245,160,.05)}
    .toc-divider{height:1px;background:var(--border);margin:1rem 0}
    .toc-series{list-style:none;display:flex;flex-direction:column;gap:.1rem}.toc-series-item a{font-family:var(--mono);font-size:.65rem;color:var(--text-dim);text-decoration:none;padding:.3rem .7rem;display:flex;align-items:center;gap:.5rem;transition:color .15s}.toc-series-item a:hover{color:var(--accent2)}.toc-series-item a.current{color:var(--accent);font-weight:bold}
    .series-num{width:18px;height:18px;border:1px solid var(--border);border-radius:2px;display:flex;align-items:center;justify-content:center;font-size:.6rem;flex-shrink:0}.toc-series-item a.current .series-num{background:var(--accent);color:var(--bg);border-color:var(--accent)}
    .toc-meta{font-family:var(--mono);font-size:.65rem;color:var(--text-dim);display:flex;flex-direction:column;gap:.55rem;margin-top:1.5rem}.toc-meta-item{display:flex;align-items:center;gap:.5rem}.toc-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}
    .tut-hero{padding:3.5rem 4rem 0;border-bottom:1px solid var(--border);position:relative;overflow:hidden;background:linear-gradient(160deg,#080f18 0%,var(--bg) 100%)}
    
    .tut-hero::before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(0,212,255,.02) 1px,transparent 1px),linear-gradient(90deg,rgba(0,212,255,.02) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse 90% 100% at 10% 40%,black 20%,transparent 100%)}
    .hero-glow{position:absolute;width:600px;height:400px;background:radial-gradient(ellipse,rgba(0,212,255,.06) 0%,transparent 70%);top:-80px;right:-50px;pointer-events:none}
    .breadcrumb{font-family:var(--mono);font-size:.7rem;color:var(--text-dim);margin-bottom:1.2rem;display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}.breadcrumb a{color:var(--text-dim);text-decoration:none;transition:color .2s}.breadcrumb a:hover{color:var(--accent)}.breadcrumb span{color:var(--border2)}
    .series-badge{display:inline-flex;align-items:center;gap:.6rem;font-family:var(--mono);font-size:.68rem;color:var(--accent2);background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.2);padding:.3rem .8rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:1rem}
    .badge-dot{width:6px;height:6px;border-radius:50%;background:var(--accent2);animation:pulse 2s ease-in-out infinite}
    @keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.7)}}
    .tut-title{font-family:var(--display);font-size:clamp(1.8rem,3.5vw,3rem);font-weight:800;letter-spacing:-.025em;line-height:1.1;margin-bottom:1rem}
    .hl{color:var(--accent)}.hl2{color:var(--accent2)}.hl3{color:var(--accent3)}
    .tut-tags{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:1.2rem}
    
    
    
    
    
    .tut-byline{display:flex;align-items:center;gap:2rem;flex-wrap:wrap;margin-bottom:2rem}
    .byline-item{font-family:var(--mono);font-size:.72rem;color:var(--text-dim);display:flex;align-items:center;gap:.4rem}
    .video-section{position:relative;background:#000;border:1px solid var(--border);overflow:hidden;aspect-ratio:16/9;cursor:pointer}
    .video-placeholder{width:100%;height:100%;object-fit:cover;opacity:.5;transition:opacity .3s}.video-section:hover .video-placeholder{opacity:.3}
    .video-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.5rem}
    .play-ring{width:80px;height:80px;border:2px solid var(--accent2);border-radius:50%;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.5);transition:all .3s}.video-section:hover .play-ring{background:var(--accent2);transform:scale(1.08)}.video-section:hover .play-ring svg{fill:var(--bg)}.play-ring svg{fill:var(--accent2);width:26px;margin-left:5px}
    .video-label{font-family:var(--display);font-size:1.2rem;font-weight:800;color:#fff;text-align:center;text-shadow:0 2px 20px rgba(0,0,0,.8)}
    .video-sublabel{font-family:var(--mono);font-size:.72rem;color:rgba(255,255,255,.5);letter-spacing:.1em}
    .video-duration{position:absolute;bottom:1rem;right:1rem;font-family:var(--mono);font-size:.72rem;background:rgba(0,0,0,.8);color:#fff;padding:.25rem .6rem;border:1px solid rgba(255,255,255,.1)}
    .video-part{position:absolute;top:1rem;left:1rem;font-family:var(--mono);font-size:.65rem;background:var(--accent2);color:var(--bg);padding:.2rem .6rem;letter-spacing:.1em;text-transform:uppercase}
    .video-bar{display:flex;align-items:center;justify-content:space-between;padding:.9rem 1.2rem;background:var(--surface2);border:1px solid var(--border);border-top:none;margin-bottom:2.5rem}
    .video-bar-left{display:flex;align-items:center;gap:1.5rem}.vb-item{font-family:var(--mono);font-size:.7rem;color:var(--text-dim);display:flex;align-items:center;gap:.4rem}.vb-dot{width:5px;height:5px;border-radius:50%;background:var(--accent2)}
    .snav-btn{font-family:var(--mono);font-size:.68rem;color:var(--text-dim);background:var(--surface3);border:1px solid var(--border);padding:.3rem .8rem;cursor:pointer;letter-spacing:.08em;text-transform:uppercase;transition:all .15s;text-decoration:none;display:inline-block}.snav-btn:hover{color:var(--accent2);border-color:var(--accent2)}.snav-btn.next{color:var(--bg);background:var(--accent2);border-color:var(--accent2)}.snav-btn.next:hover{background:var(--accent);border-color:var(--accent);color:var(--bg)}
    .tut-body{padding:0 4rem 4rem}
    .tut-section{margin-bottom:3.5rem;scroll-margin-top:80px}
    .section-eyebrow{font-family:var(--mono);font-size:.65rem;color:var(--accent2);letter-spacing:.22em;text-transform:uppercase;margin-bottom:.7rem;display:flex;align-items:center;gap:.7rem}.section-eyebrow::before{content:'';width:20px;height:1px;background:var(--accent2)}
    .section-title{font-family:var(--display);font-size:1.6rem;font-weight:800;letter-spacing:-.015em;margin-bottom:1.2rem;padding-bottom:.9rem;border-bottom:1px solid var(--border)}
    .tut-p{font-size:.97rem;color:var(--text-dim);line-height:1.85;margin-bottom:1.2rem}.tut-p strong{color:var(--text)}.tut-p code{font-family:var(--mono);font-size:.82rem;color:var(--accent2);background:rgba(0,212,255,.07);padding:.1rem .4rem;border:1px solid rgba(0,212,255,.15)}
    .concept-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--border);margin-bottom:2rem}
    .concept-card{background:var(--surface);padding:1.5rem;display:flex;flex-direction:column;gap:.7rem;transition:background .18s}.concept-card:hover{background:var(--surface2)}
    .concept-icon{font-size:1.8rem;line-height:1}.concept-name{font-family:var(--display);font-size:1rem;font-weight:700}
    .concept-name.blue{color:var(--accent2)}.concept-name.green{color:var(--accent)}.concept-name.red{color:var(--accent3)}
    .concept-desc{font-size:.85rem;color:var(--text-dim);line-height:1.65}.concept-spec{font-family:var(--mono);font-size:.65rem;color:var(--text-dim);background:var(--bg);border:1px solid var(--border);padding:.4rem .7rem;margin-top:auto}
    .stage-grid{display:flex;flex-direction:column;gap:1px;background:var(--border);margin-bottom:2rem}
    .stage-card{background:var(--surface);padding:1.2rem 1.5rem;display:grid;grid-template-columns:40px 1fr;gap:1rem;align-items:start;transition:background .18s}.stage-card:hover{background:var(--surface2)}
    .stage-num{font-family:var(--mono);font-size:.8rem;color:var(--bg);background:var(--accent2);width:28px;height:28px;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-weight:bold}.stage-num.orange{background:var(--accent4)}.stage-num.green{background:var(--accent)}.stage-num.red{background:var(--accent3)}
    .stage-name{font-family:var(--display);font-size:1rem;font-weight:700;margin-bottom:.3rem}.stage-desc{font-size:.85rem;color:var(--text-dim);line-height:1.65}.stage-spec{font-family:var(--mono);font-size:.65rem;color:var(--text-dim);background:var(--bg);border:1px solid var(--border);padding:.3rem .7rem;margin-top:.5rem;display:inline-block}
    .code-step{font-family:var(--display);font-size:1.15rem;font-weight:800;color:var(--text);margin:2rem 0 .8rem;display:flex;align-items:center;gap:.8rem}
    .step-num{font-family:var(--mono);font-size:.9rem;color:var(--accent2);width:34px;height:34px;border:1px solid rgba(0,212,255,.3);display:flex;align-items:center;justify-content:center;flex-shrink:0}
    .code-wrap{position:relative;margin-bottom:2rem}
    .code-header{display:flex;align-items:center;justify-content:space-between;background:var(--surface2);border:1px solid var(--border);border-bottom:none;padding:.6rem 1rem}
    .code-dots{display:flex;gap:5px}.code-dot{width:9px;height:9px;border-radius:50%}.code-dot.r{background:#ff5f57}.code-dot.y{background:#febc2e}.code-dot.g{background:#28c840}
    .code-fname{font-family:var(--mono);font-size:.72rem;color:var(--text-dim);margin-left:.5rem}.code-lang{font-family:var(--mono);font-size:.62rem;color:var(--accent2);letter-spacing:.1em;text-transform:uppercase}
    .copy-btn{font-family:var(--mono);font-size:.65rem;color:var(--text-dim);background:var(--surface3);border:1px solid var(--border);padding:.25rem .7rem;cursor:pointer;letter-spacing:.08em;text-transform:uppercase;transition:all .15s}.copy-btn:hover{color:var(--accent);border-color:var(--accent)}.copy-btn.copied{color:var(--accent);border-color:var(--accent);background:rgba(0,245,160,.08)}
    pre.codebox{background:var(--bg);border:1px solid var(--border);padding:1.5rem;overflow-x:auto;margin:0;font-family:var(--mono);font-size:.78rem;line-height:1.85;color:#cdd9e5}
    .kw{color:#c792ea}.fn{color:var(--accent2)}.str{color:#c3e88d}.cm{color:#546e7a}.num{color:#f78c6c}.type{color:var(--accent)}.pp{color:#f78c6c}
    .info-box{border:1px solid rgba(0,212,255,.25);background:rgba(0,212,255,.04);padding:1rem 1.4rem;display:flex;gap:1rem;margin-bottom:1.5rem}
    .warn-box{border:1px solid rgba(245,166,35,.3);background:rgba(245,166,35,.04);padding:1rem 1.4rem;display:flex;gap:1rem;margin-bottom:1.5rem}
    .box-icon{font-size:1rem;flex-shrink:0;margin-top:2px}
    .box-title{font-family:var(--display);font-size:.88rem;font-weight:700;margin-bottom:.4rem}
    .info-box .box-title{color:var(--accent2)}.warn-box .box-title{color:var(--accent4)}
    .box-text{font-size:.88rem;color:var(--text-dim);line-height:1.65}
    .check-list{list-style:none;display:flex;flex-direction:column;gap:.55rem;margin-bottom:1.5rem}.check-item{display:flex;gap:.8rem;font-size:.93rem;color:var(--text-dim)}.check-icon{color:var(--accent);font-family:var(--mono);font-size:.8rem;margin-top:3px;flex-shrink:0}
    .series-strip{border:1px solid var(--border);background:var(--surface);overflow:hidden;margin-bottom:2.5rem}
    .series-strip-header{padding:.8rem 1.2rem;background:var(--surface2);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
    .ss-title{font-family:var(--display);font-size:.9rem;font-weight:700;display:flex;align-items:center;gap:.6rem}.ss-badge{font-family:var(--mono);font-size:.6rem;background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.25);color:var(--accent2);padding:.15rem .5rem;letter-spacing:.1em;text-transform:uppercase}
    .series-episodes{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border)}
    .ep{background:var(--surface);padding:.9rem 1rem;cursor:pointer;transition:background .15s;text-decoration:none;display:block}.ep:hover{background:var(--surface2)}
    .ep.active{background:rgba(0,212,255,.06);border-left:2px solid var(--accent2)}
    .ep-num{font-family:var(--mono);font-size:.6rem;color:var(--text-dim);margin-bottom:.3rem}.ep-title{font-family:var(--display);font-size:.8rem;font-weight:700;color:var(--text);line-height:1.3}.ep.active .ep-title{color:var(--accent2)}.ep-dur{font-family:var(--mono);font-size:.62rem;color:var(--text-dim);margin-top:.3rem}
    .related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--border);margin-top:3rem}
    .related-card{background:var(--surface);padding:1.5rem;cursor:pointer;transition:background .18s;text-decoration:none;display:flex;flex-direction:column;gap:.6rem}.related-card:hover{background:var(--surface2)}
    .related-tag{font-family:var(--mono);font-size:.62rem;color:var(--accent2);letter-spacing:.12em;text-transform:uppercase}.related-title{font-family:var(--display);font-size:.95rem;font-weight:700;color:var(--text);line-height:1.35}.related-meta{font-family:var(--mono);font-size:.62rem;color:var(--text-dim);margin-top:auto}
    .tut-cta{border-top:1px solid var(--border);padding:3rem 0 0;text-align:center;margin-top:3rem}.cta-title{font-family:var(--display);font-size:1.8rem;font-weight:800;margin-bottom:.8rem}.cta-sub{color:var(--text-dim);max-width:480px;margin:0 auto 2rem;font-size:.95rem;line-height:1.7}
    .cta-btns{display:flex;justify-content:center;gap:1rem;flex-wrap:wrap}
    
    
    
    
    
    
    
    /* COMPARISON TABLE */
    .cmp-table{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:.78rem;margin-bottom:2rem;border:1px solid var(--border)}
    .cmp-table thead tr{background:var(--surface2);border-bottom:1px solid var(--border)}
    .cmp-table th{text-align:left;padding:.7rem 1.1rem;font-size:.65rem;color:var(--text-dim);letter-spacing:.14em;text-transform:uppercase;font-weight:normal;border-right:1px solid var(--border)}
    .cmp-table th:last-child{border-right:none}
    .cmp-table td{padding:.7rem 1.1rem;border-bottom:1px solid var(--border);border-right:1px solid var(--border);color:var(--text-dim);vertical-align:middle}
    .cmp-table td:first-child{color:var(--text);font-weight:bold}
    .cmp-table td:last-child{border-right:none}
    .cmp-table tbody tr:last-child td{border-bottom:none}
    .cmp-table tbody tr:hover td{background:var(--surface2)}

    /* BADGES */
    .badge-yes{display:inline-flex;align-items:center;gap:.3rem;font-size:.7rem;color:var(--accent);background:rgba(0,245,160,.08);border:1px solid rgba(0,245,160,.25);padding:.15rem .5rem;letter-spacing:.04em}
    .badge-yes2{display:inline-flex;align-items:center;gap:.3rem;font-size:.7rem;color:var(--accent2);background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.25);padding:.15rem .5rem;letter-spacing:.04em}
    .badge-no{display:inline-flex;align-items:center;gap:.3rem;font-size:.7rem;color:var(--accent3);background:rgba(255,77,109,.06);border:1px solid rgba(255,77,109,.2);padding:.15rem .5rem;letter-spacing:.04em}

    /* DIAGRAMS */
    .diagram{border:1px solid var(--border);background:var(--surface);padding:1.5rem;margin-bottom:1.5rem;font-family:var(--mono)}
    .diagram-title{font-size:.72rem;color:var(--text-dim);margin-bottom:1rem;letter-spacing:.06em}
    .diag-row{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;margin:.5rem 0}
    .diag-task{font-size:.75rem;padding:.3rem .8rem;border:1px solid;white-space:nowrap}
    .diag-task.high{color:var(--accent3);border-color:rgba(255,77,109,.3);background:rgba(255,77,109,.07)}
    .diag-task.med{color:var(--accent4);border-color:rgba(245,166,35,.3);background:rgba(245,166,35,.07)}
    .diag-task.low{color:var(--accent2);border-color:rgba(0,212,255,.3);background:rgba(0,212,255,.07)}
    .diag-arrow{font-size:.75rem;color:var(--text-dim);white-space:nowrap}
    .diag-prim{font-size:.75rem;color:var(--accent);padding:.3rem .8rem;border:1px solid rgba(0,245,160,.3);background:rgba(0,245,160,.07);white-space:nowrap}
    .diag-label{font-size:.72rem;color:var(--text-dim)}
    .danger-box{border:1px solid rgba(255,77,109,.3);background:rgba(255,77,109,.04);padding:1rem 1.4rem;display:flex;gap:1rem;margin-bottom:1.5rem}
    .danger-box .box-title{color:var(--accent3)}
    @media(max-width:1100px){.concept-grid{grid-template-columns:1fr}.series-episodes{grid-template-columns:repeat(2,1fr)}.related-grid{grid-template-columns:1fr}}
    @media(max-width:700px){.tut-hero,.tut-body{padding:2rem 1.5rem 3rem}}