:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f2ea;--bg-2:#eef5ff;--ink:#1a1b1f;--muted:#5b606a;--accent:#0b6b5d;--accent-2:#c05a1a;--accent-3:#9f8a2d;--line:#dad4c7;--panel:#fff;--panel-2:#f8f3ea;--shadow:0 24px 60px #1418262e;--radius:18px;--radius-sm:12px;--page-width:78ch;--sidebar-width:290px;--header-height:64px;--font-scale:1;--reading-progress:0%;--code-bg:#14182612;--pre-bg:#f5f2eb;--pre-color:#2d2d2d;--pre-border:#1418261f;--bq-bg:#0b6b5d0f;--h3-border:var(--accent);--h3-bg:#0b6b5d0a;--sidebar-bg-start:#fffffff0;--sidebar-bg-end:#f8f3eae6;--topbar-bg:#f6f2eadb;--card-bg:#ffffffeb;--nav-link-bg:#ffffffbf;--details-bg:#ffffffd9;--callout-bg:#ffffffeb;--page-nav-bg:#ffffffbf}[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#0a0e1a;--bg-2:#111827;--ink:#eff1f5;--muted:#9ca3b8;--accent:#34d399;--accent-2:#f59e0b;--accent-3:#d4b84d;--line:#1e2740;--panel:#111827;--panel-2:#1a2035;--shadow:0 24px 60px #0000008c;--code-bg:#ffffff14;--pre-bg:#080c14;--pre-color:#e6edf3;--pre-border:#ffffff0f;--bq-bg:#34d39912;--h3-border:var(--accent);--h3-bg:#34d3990d;--sidebar-bg-start:#111827f7;--sidebar-bg-end:#0a0e1af5;--topbar-bg:#0a0e1ae6;--card-bg:#111827eb;--nav-link-bg:#111827bf;--details-bg:#111827d9;--callout-bg:#111827eb;--page-nav-bg:#111827bf}*{box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-body);font-size:calc(17px*var(--font-scale));color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;background-image:radial-gradient(1200px 600px at 10% -10%,#0e6b5d1f,#0000 60%),radial-gradient(900px 500px at 90% 10%,#c05a1a1f,#0000 60%),linear-gradient(#fff9 0%,#f6f2eae6 100%);margin:0;line-height:1.78}[data-theme=dark] body{background-image:radial-gradient(1200px 600px at 10% -10%,#34d3990d,#0000 60%),radial-gradient(900px 500px at 90% 10%,#f59e0b0a,#0000 60%),linear-gradient(#0a0e1ae6 0%,#0a0e1a 100%)}::selection{background:#0b6b5d33}[data-theme=dark] ::selection{background:#34d39940}a{color:inherit;text-decoration:none}img{max-width:100%}button{font-family:inherit}.app-shell{grid-template-columns:var(--sidebar-width)1fr;min-height:100vh;display:grid}.app-shell-no-sidebar{flex-direction:column;min-height:100vh;display:flex}.reading-progress{height:3px;width:var(--reading-progress);background:linear-gradient(90deg,var(--accent),var(--accent-2));z-index:50;position:fixed;top:0;left:0}.sidebar{border-right:1px solid var(--line);background:linear-gradient(180deg,var(--sidebar-bg-start),var(--sidebar-bg-end));-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);height:100vh;position:sticky;top:0}.sidebar-inner{flex-direction:column;gap:24px;height:100%;padding:28px 22px;display:flex;overflow:auto}.brand{flex-direction:column;gap:6px;display:flex}.brand-title{font-family:var(--font-display);letter-spacing:.5px;font-size:22px}.brand-sub{text-transform:uppercase;letter-spacing:1.6px;color:var(--muted);font-size:13px}.brand-sub a{color:var(--muted)}.brand-sub a:hover{color:var(--accent)}.nav{flex:1}.nav-section{flex-direction:column;gap:14px;display:flex}.nav-label{letter-spacing:1.4px;text-transform:uppercase;color:var(--muted);font-size:12px}.nav-label a{color:var(--muted)}.nav-label a:hover{color:var(--accent)}.nav-items{flex-direction:column;gap:10px;display:flex}.nav-section-item{flex-direction:column;display:flex}.nav-link{border-radius:var(--radius-sm);background:var(--nav-link-bg);cursor:pointer;border:1px solid #0000;align-items:center;gap:0;padding:10px 12px;transition:border-color .2s,box-shadow .2s;display:flex}.nav-link:hover{border-color:#0b6b5d40;box-shadow:0 10px 18px #0b6b5d14}.nav-link-active{background:#0b6b5d0f;border-color:#0b6b5d59}.nav-link-inner{flex:1;grid-template-columns:32px 1fr;align-items:center;gap:10px;min-width:0;display:grid}.nav-expand{color:var(--accent);flex-shrink:0;margin-left:6px;font-size:14px;font-weight:700;transition:transform .2s}.nav-expand-open{transform:rotate(90deg)}.nav-index{color:var(--accent);font-size:12px;font-weight:600}.nav-title{color:var(--ink);white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.nav-chapters{border-left:2px solid var(--line);flex-direction:column;gap:2px;margin-top:4px;margin-left:22px;padding:4px 0 4px 16px;display:flex}.nav-chapter-link{color:var(--ink);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:8px;justify-content:space-between;align-items:center;width:100%;padding:6px 10px;font-size:13px;transition:background .15s;display:flex}.nav-chapter-active{color:var(--accent);background:#0b6b5d1a}.nav-sub-active{color:var(--ink);background:#0b6b5d1a}.nav-chapter-link:hover{background:#0b6b5d14}.nav-chapter-title{font-weight:500}.nav-chevron{color:var(--accent);font-size:13px;font-weight:700;transition:transform .2s}.nav-chevron-open{transform:rotate(90deg)}.nav-subchapters{border-left:2px solid var(--line);flex-direction:column;gap:1px;margin-top:2px;margin-left:8px;padding:2px 0 2px 12px;display:flex}.nav-sub-link{color:var(--muted);border-radius:6px;align-items:baseline;gap:6px;padding:4px 8px;font-size:12px;transition:background .15s,color .15s;display:flex}.nav-sub-link:hover{color:var(--ink);background:#0b6b5d14}.nav-sub-id{color:var(--accent);flex-shrink:0;font-weight:600}.nav-sub-title{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.sidebar-footer{flex-wrap:wrap;gap:8px;display:flex}.status-pill{color:var(--accent);background:#0b6b5d1f;border-radius:999px;padding:6px 10px;font-size:12px}.app-main{flex-direction:column;min-height:100vh;display:flex}.topbar{z-index:20;background:var(--topbar-bg);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:18px 32px;display:flex;position:sticky;top:0}.topbar-title{letter-spacing:1px;text-transform:uppercase;color:var(--muted);font-size:14px}.topbar-actions{align-items:center;gap:8px;display:flex}.focus-toggle,.theme-toggle{border:1px solid var(--line);background:var(--panel);color:var(--ink);cursor:pointer;border-radius:999px;padding:8px 14px;font-size:13px;transition:all .2s}.focus-toggle:hover,.theme-toggle:hover{color:var(--accent);border-color:#0b6b5d66}.content{max-width:var(--page-width);flex:1;width:100%;margin:0 auto;padding:48px 48px 100px}.footer{color:var(--muted);padding:18px 32px 40px;font-size:13px}.page{flex-direction:column;gap:42px;display:flex}.hero{background:var(--panel);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;gap:20px;padding:46px;display:flex}.hero-kicker{text-transform:uppercase;letter-spacing:2px;color:var(--muted);font-size:12px}.hero-title{font-family:var(--font-display);margin:0;font-size:48px;line-height:1.05}.hero-subtitle{color:var(--muted);max-width:70ch;font-size:18px}.hero-actions{flex-wrap:wrap;gap:12px;display:flex}.button{border:1px solid var(--line);cursor:pointer;border-radius:999px;justify-content:center;align-items:center;padding:12px 20px;font-size:14px;font-weight:600;transition:transform .2s,box-shadow .2s;display:inline-flex}.button.primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border:none}.button.ghost{background:0 0}.button:hover{transform:translateY(-2px);box-shadow:0 12px 22px #0b6b5d2e}.hero-meta{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;display:grid}.meta-card{border-radius:var(--radius-sm);background:var(--panel-2);border:1px solid var(--line);padding:16px}.meta-title{font-size:14px;font-weight:600}.meta-text{color:var(--muted);font-size:13px}.section-grid{flex-direction:column;gap:24px;display:flex}.section-grid-header h2{font-family:var(--font-display);margin-bottom:6px}.section-grid-header p{color:var(--muted);margin:0}.grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;display:grid}.card{border-radius:var(--radius-sm);background:var(--card-bg);border:1px solid var(--line);flex-direction:column;gap:10px;min-height:150px;padding:18px;transition:transform .2s,box-shadow .2s;display:flex}.card:hover{transform:translateY(-2px);box-shadow:0 16px 24px #1418261f}.card-index{text-transform:uppercase;letter-spacing:1.6px;color:var(--accent-3);font-size:12px}.card-title{font-size:16px;font-weight:600}.card-text{color:var(--muted);font-size:13px}.content :where(h1,h2,h3,h4,h5){font-family:var(--font-display);scroll-margin-top:100px;line-height:1.2}.content h1{letter-spacing:-.6px;background:linear-gradient(135deg,var(--ink)60%,var(--accent));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin-top:0;margin-bottom:1.4rem;font-size:38px;line-height:1.15}.content h2{letter-spacing:-.3px;color:var(--ink);margin-top:3.2rem;margin-bottom:1.2rem;font-size:28px}.content h3{border-left:3px solid var(--h3-border);background:var(--h3-bg);border-radius:0 10px 10px 0;margin-top:2.8rem;margin-bottom:1rem;padding:12px 18px;font-size:21px;line-height:1.35}.content h4{color:var(--accent-2);margin-top:2.2rem;margin-bottom:.7rem;font-size:18px;line-height:1.35}.content h5{color:var(--accent-3);text-transform:uppercase;letter-spacing:.8px;margin-top:1.8rem;margin-bottom:.6rem;font-size:15px;font-weight:600}.content p{color:var(--ink);letter-spacing:.01em;margin:0 0 1.35rem}.content strong{color:var(--accent);font-weight:700}.content em{color:var(--muted);font-style:italic}.content ul,.content ol{margin-bottom:1.5rem;padding-left:24px}.content ul{list-style:none}.content ul>li{margin-bottom:.6rem;padding-left:8px;line-height:1.7;position:relative}.content ul>li:before{content:"";background:var(--accent);opacity:.7;border-radius:2px;width:6px;height:6px;position:absolute;top:11px;left:-14px}.content ul ul{margin-top:.4rem;margin-bottom:.6rem}.content ul ul>li:before{background:var(--accent-2);opacity:.6;border-radius:50%;width:5px;height:5px}.content ul ul ul>li:before{background:var(--accent-3);opacity:.5;width:4px;height:4px}.content ol>li{margin-bottom:.6rem;padding-left:6px;line-height:1.7}.content ol>li::marker{color:var(--accent);font-size:.95em;font-weight:700}.content hr{background:linear-gradient(90deg,transparent 5%,var(--line)20%,var(--accent)50%,var(--line)80%,transparent 95%);opacity:.5;border:none;height:1px;margin:3rem 0}.content blockquote{border-left:4px solid var(--accent);background:var(--bq-bg);color:var(--ink);border-radius:0 14px 14px 0;margin:2rem 0;padding:22px 26px;font-size:1.06em;font-style:italic;line-height:1.72}.content blockquote strong{color:var(--accent)}.content blockquote p:last-child{margin-bottom:0}.content code{background:var(--code-bg);border:1px solid var(--line);border-radius:6px;padding:2px 8px;font-family:Courier New,monospace;font-size:.9em}.content pre{background:var(--pre-bg);color:var(--pre-color);border:1px solid var(--pre-border);border-radius:12px;padding:18px;overflow:auto}.content pre code{color:inherit;background:0 0;border:none;padding:0}.content table{border-collapse:separate;border-spacing:0;border-radius:var(--radius-sm);border:1px solid var(--line);width:100%;margin:1.6rem 0;font-size:14px;overflow:hidden}.content th{background:var(--panel-2);text-align:left;border-bottom:2px solid var(--line);color:var(--ink);text-transform:uppercase;letter-spacing:.5px;padding:10px 14px;font-size:13px;font-weight:600}.content td{border-bottom:1px solid var(--line);padding:10px 14px}.content tr:last-child td{border-bottom:none}.content tbody tr:nth-child(2n){background:var(--panel-2)}.content tbody tr:hover{background:var(--h3-bg)}.content a{color:var(--accent);text-underline-offset:3px;text-decoration:underline}.content a:hover{color:var(--accent-2)}.content details{border:1px solid var(--line);background:var(--details-bg);border-radius:12px;margin:1.2rem 0;padding:12px 14px}.content summary{cursor:pointer;font-weight:600;list-style:none}.content summary::-webkit-details-marker{display:none}.page-nav{border-top:1px solid var(--line);justify-content:space-between;gap:16px;margin-top:3rem;padding-top:2rem;display:flex}.page-nav-link{border-radius:var(--radius-sm);border:1px solid var(--line);background:var(--page-nav-bg);flex-direction:column;gap:4px;max-width:50%;padding:14px 18px;text-decoration:none;transition:border-color .2s,box-shadow .2s;display:flex}.page-nav-link:hover{border-color:#0b6b5d59;box-shadow:0 8px 16px #0b6b5d1a}.page-nav-next{text-align:right;margin-left:auto}.page-nav-dir{text-transform:uppercase;letter-spacing:1.2px;color:var(--accent);font-size:12px;font-weight:600}.page-nav-label{color:var(--ink);font-size:14px;line-height:1.3}:root[data-focus=true]{--font-scale:1.05}:root[data-focus=true] .app-shell{grid-template-columns:0 1fr}:root[data-focus=true] .sidebar{opacity:0;pointer-events:none;transform:translate(-16px)}.auth-btn{cursor:pointer;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:999px;align-items:center;padding:8px 16px;font-size:13px;font-weight:500;transition:all .2s;display:inline-flex}.auth-btn:hover{color:var(--accent);border-color:#0b6b5d66}.auth-btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.auth-btn-primary:hover{opacity:.9}.auth-btn-secondary{background:0 0}.auth-btn-loading{opacity:.5}.auth-user{align-items:center;gap:8px;display:flex}.book-card{border-radius:var(--radius);border:1px solid var(--line);background:var(--card-bg);flex-direction:column;transition:transform .2s,box-shadow .2s;display:flex;overflow:hidden}.book-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}.book-card-cover{align-items:flex-end;min-height:180px;padding:32px 24px;display:flex}.book-card-cover-title{font-family:var(--font-display);color:#fff;font-size:24px;font-weight:700}.book-card-body{flex-direction:column;gap:8px;padding:20px 24px;display:flex}.book-card-title{margin:0;font-size:18px;font-weight:700}.book-card-subtitle{color:var(--muted);margin:0;font-size:14px}.book-card-desc{color:var(--muted);font-size:13px;line-height:1.6}.book-card-progress{align-items:center;gap:8px;margin-top:8px;display:flex}.book-card-progress-text{color:var(--muted);font-size:12px}.book-card-cta{color:var(--accent);margin-top:4px;font-size:13px;font-weight:600}.book-card-media{padding:20px 24px 8px}.book-hero{grid-template-columns:1fr auto;align-items:center;gap:24px;display:grid}.book-hero-media{justify-self:end}.book3d-stage{--book-rot-x:0deg;--book-rot-y:0deg;--book-glow-x:50%;--book-glow-y:32%;--book-accent:var(--accent);perspective:1400px;width:100%;max-width:230px}.book3d-sm{max-width:155px}.book3d-md{max-width:210px}.book3d-lg{max-width:250px}.book3d{transform-style:preserve-3d;transform:rotateX(var(--book-rot-x))rotateY(var(--book-rot-y));will-change:transform;transition:transform .22s cubic-bezier(.16,1,.3,1);position:relative}.book3d-front{aspect-ratio:2/3;background:#0d101a;border:1px solid #ffffff52;border-radius:14px;position:relative;overflow:hidden;transform:translateZ(2px);box-shadow:0 24px 38px #0a0e1a3d,0 4px 10px #0a0e1a33}.book3d-image{object-fit:cover}.book3d-spine{background:linear-gradient(180deg,color-mix(in oklab,var(--book-accent)88%,black),color-mix(in oklab,var(--book-accent)62%,black));transform-origin:0;border-radius:8px 0 0 8px;width:10px;height:94%;position:absolute;top:3%;left:-10px;transform:rotateY(90deg)translateZ(1px);box-shadow:inset -1px 0 #fff3}.book3d-shine{pointer-events:none;background:radial-gradient(120px 90px at var(--book-glow-x)var(--book-glow-y),#ffffff52,transparent 68%),linear-gradient(120deg,#ffffff2e 0%,transparent 30% 70%,#ffffff0f 100%);mix-blend-mode:screen;position:absolute;inset:0}.book3d-shadow{filter:blur(5px);background:radial-gradient(closest-side,#0f142059,#0000 85%);border-radius:999px;height:18px;position:absolute;bottom:-14px;left:10%;right:10%;transform:translateZ(-1px)}[data-theme=dark] .book3d-front{border-color:#94a3b840}@media (max-width:900px){.book-hero{grid-template-columns:1fr}.book-hero-media{justify-self:start}.book3d-lg{max-width:220px}}.pricing-page{flex-direction:column;align-items:center;gap:48px;padding:48px 24px;display:flex}.pricing-header{text-align:center;max-width:60ch}.pricing-header h1{font-family:var(--font-display);margin-bottom:12px;font-size:42px}.pricing-header p{color:var(--muted);font-size:18px}.pricing-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;width:100%;max-width:1000px;display:grid}.pricing-card{border-radius:var(--radius);border:1px solid var(--line);background:var(--panel);flex-direction:column;gap:16px;padding:32px;display:flex}.pricing-card-highlight{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.pricing-card-title{font-size:20px;font-weight:700}.pricing-card-price{align-items:baseline;gap:4px;display:flex}.pricing-card-amount{font-family:var(--font-display);font-size:42px;font-weight:700}.pricing-card-period{color:var(--muted);font-size:16px}.pricing-card-features{flex-direction:column;flex:1;gap:8px;padding:0;list-style:none;display:flex}.pricing-card-features li{color:var(--ink);padding-left:20px;font-size:14px;position:relative}.pricing-card-features li:before{content:"✓";color:var(--accent);font-weight:700;position:absolute;left:0}.pricing-card-cta{text-align:center;width:100%;margin-top:auto}.paywall-gate{justify-content:center;align-items:center;min-height:400px;padding:48px;display:flex}.paywall-gate-inner{text-align:center;flex-direction:column;gap:16px;max-width:480px;display:flex}.paywall-gate-inner h2{font-family:var(--font-display);font-size:28px}.paywall-gate-inner p{color:var(--muted);font-size:16px}.paywall-gate-actions{justify-content:center;gap:12px;display:flex}.video-embed{border-radius:var(--radius-sm);height:0;margin:2rem 0;padding-bottom:56.25%;position:relative;overflow:hidden}.video-embed iframe{border:none;width:100%;height:100%;position:absolute;top:0;left:0}.checklist-panel{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--panel);margin-top:2rem;padding:20px}.checklist-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.checklist-title{font-size:15px;font-weight:600}.checklist-count{color:var(--muted);font-size:13px}.checklist-items{flex-direction:column;gap:8px;display:flex}.checklist-item{cursor:pointer;align-items:center;gap:10px;font-size:14px;display:flex}.checklist-item input[type=checkbox]{accent-color:var(--accent)}.checklist-item-done{color:var(--muted);text-decoration:line-through}.progress-badge{color:var(--muted);align-items:center;gap:4px;font-size:12px;display:inline-flex}.dashboard{max-width:1100px;margin:0 auto;padding:48px}.dashboard h1{font-family:var(--font-display);margin-bottom:8px;font-size:32px}.dashboard-subtitle{color:var(--muted);margin-bottom:32px}.dashboard-books{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px;display:grid}.dashboard-continue{margin-top:40px}.dashboard-continue h2{font-family:var(--font-display);margin-bottom:16px;font-size:22px}.dash-section-label{text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-top:32px;margin-bottom:12px;font-size:12px;font-weight:600}.dash-continue{margin-bottom:8px}.dash-continue-card{background:var(--card-bg);border:1px solid var(--line);border-radius:var(--radius-sm);align-items:center;gap:16px;padding:16px 20px;transition:border-color .2s;display:flex}.dash-continue-card:hover{border-color:var(--accent)}.dash-continue-info{flex-direction:column;flex:1;gap:2px;min-width:0;display:flex}.dash-continue-book{text-transform:uppercase;letter-spacing:.06em;color:var(--accent);font-size:11px;font-weight:600}.dash-continue-title{white-space:nowrap;text-overflow:ellipsis;font-size:15px;font-weight:500;overflow:hidden}.dash-continue-progress{background:var(--code-bg);border-radius:2px;flex-shrink:0;width:120px;height:4px;overflow:hidden}.dash-continue-bar{background:var(--accent);border-radius:2px;height:100%;transition:width .3s}.dash-continue-arrow{color:var(--muted);flex-shrink:0;font-size:18px}.dash-stats-grid{grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:8px;display:grid}.dash-stat-card{background:var(--card-bg);border:1px solid var(--line);border-radius:var(--radius-sm);text-align:center;padding:20px}.dash-stat-number{font-family:var(--font-display);color:var(--accent);font-size:28px;font-weight:700}.dash-stat-label{color:var(--muted);margin-top:4px;font-size:13px}.book-card-progress{background:var(--code-bg);border-radius:2px;width:100%;height:4px;margin-bottom:8px;overflow:hidden}.book-card-progress-bar{background:var(--accent);border-radius:2px;height:100%;transition:width .3s}.dash-bookmarks{margin-top:8px}.dash-bookmark-list{flex-direction:column;gap:4px;display:flex}.dash-bookmark-item{color:var(--ink);border-radius:8px;align-items:center;gap:10px;padding:10px 14px;font-size:14px;transition:background .15s;display:flex}.dash-bookmark-item:hover{background:var(--code-bg)}.dash-bookmark-item svg{color:var(--accent);flex-shrink:0}@media 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