:root{--bg:#071020;--panel:#0d1930;--panel2:#111f3b;--line:#243654;--text:#edf4ff;--muted:#9fb0ca;--blue:#4d8dff;--cyan:#38d6e8;--violet:#9879ff;--pink:#ff72b6;--green:#43d19e;--amber:#ffc767;--danger:#ff7a89;--shadow:0 24px 70px rgba(0,0,0,.34);--radius:22px;--nav:280px}
    *{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;background:radial-gradient(circle at 80% 0,#152953 0,transparent 27rem),radial-gradient(circle at 0 30%,#102d42 0,transparent 30rem),var(--bg);color:var(--text);font-family:"Noto Sans Thai","Leelawadee UI",Tahoma,system-ui,sans-serif;line-height:1.72}
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    .progress{position:fixed;top:0;left:0;right:0;height:4px;background:#17243d;z-index:80}.progress>i{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:left;background:linear-gradient(90deg,var(--cyan),var(--blue),var(--violet))}
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    .layout{display:grid;grid-template-columns:var(--nav) minmax(0,1fr);padding-top:68px}.sidebar{position:fixed;top:68px;bottom:0;width:var(--nav);padding:24px 18px 32px;border-right:1px solid rgba(125,160,210,.17);background:rgba(7,16,32,.78);backdrop-filter:blur(18px);overflow:auto;z-index:60}.searchbox{width:100%;color:var(--text);background:#0b1730;border:1px solid var(--line);border-radius:12px;padding:.72rem .85rem;outline:none}.searchbox:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(77,141,255,.15)}.search-result{font-size:.75rem;color:var(--muted);margin:.45rem 0 1rem}.nav-title{margin:1.3rem .5rem .4rem;font-size:.68rem;text-transform:uppercase;letter-spacing:.15em;color:#7184a4}.toc{display:flex;flex-direction:column;gap:2px}.toc a{display:flex;align-items:center;gap:9px;color:#aebdd3;text-decoration:none;padding:.42rem .58rem;border-radius:9px;font-size:.85rem}.toc a span{width:20px;color:#6c81a3;font-variant-numeric:tabular-nums}.toc a:hover,.toc a.active{background:#142747;color:#fff}.toc a.active span{color:var(--cyan)}
    main{grid-column:2;max-width:1180px;width:100%;margin:0 auto;padding:0 54px 100px}.hero{position:relative;min-height:82vh;display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:54px;padding:72px 0 42px;overflow:hidden}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#a9eafa;font-weight:750;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase}.eyebrow::before{content:"";width:28px;height:2px;background:var(--cyan)}h1{font-size:clamp(2.7rem,6vw,5.7rem);line-height:.98;letter-spacing:-.055em;margin:.65rem 0 1.15rem;background:linear-gradient(120deg,#fff 12%,#9ed6ff 54%,#b89bff);-webkit-background-clip:text;color:transparent}.lead{font-size:clamp(1.06rem,2vw,1.28rem);color:#bac8dc;max-width:650px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:1.7rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;border-radius:12px;padding:.72rem 1rem;font-weight:750}.btn.primary{background:linear-gradient(120deg,var(--blue),var(--violet));color:#fff;box-shadow:0 12px 30px rgba(77,141,255,.25)}.btn.secondary{background:#101e37;color:#dfeaff;border:1px solid var(--line)}
    .book-visual{position:relative;min-height:430px;perspective:1000px}.book{position:absolute;inset:58px 22px 28px 25px;border-radius:18px;background:linear-gradient(145deg,#325fc6,#6e5ae2);transform:rotateY(-12deg) rotateX(4deg);box-shadow:var(--shadow);overflow:hidden}.book::after{content:"EPUB";position:absolute;left:34px;bottom:38px;font-size:4rem;font-weight:900;opacity:.16}.page{position:absolute;width:67%;height:75%;right:0;top:12%;border-radius:10px 18px 18px 10px;background:#f7f3e8;transform-origin:left;box-shadow:-12px 12px 36px rgba(0,0,0,.25)}.page.p2{transform:rotateY(-10deg);background:#e9edf7}.page.p3{transform:rotateY(-20deg);background:#fff}.page-lines{position:absolute;inset:55px 32px;background:repeating-linear-gradient(#557090 0 2px,transparent 2px 19px);opacity:.23}.spark{position:absolute;width:9px;height:9px;background:var(--cyan);border-radius:50%;box-shadow:0 0 18px var(--cyan)}.s1{left:8%;top:22%}.s2{right:8%;top:18%;background:var(--pink)}.s3{right:1%;bottom:16%;background:var(--amber)}
    .section{padding:76px 0 24px;border-top:1px solid rgba(130,160,200,.12)}.section.hidden-search{display:none}.section-head{display:grid;grid-template-columns:72px 1fr;gap:20px;align-items:start;margin-bottom:24px}.section-no{font-size:2.5rem;font-weight:900;line-height:1;color:#294266}.section h2{font-size:clamp(1.7rem,3.5vw,2.6rem);line-height:1.18;margin:0 0 .55rem;letter-spacing:-.035em}.section h3{font-size:1.23rem;margin:2rem 0 .65rem}.section h4{font-size:1rem;margin:1.4rem 0 .35rem;color:#dce8f9}.section p{color:#b5c4d9}.kicker{color:var(--cyan)!important;font-weight:700;margin:0 0 .2rem}.grid2,.grid3{display:grid;gap:16px}.grid2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid3{grid-template-columns:repeat(3,minmax(0,1fr))}.card{background:linear-gradient(145deg,rgba(17,31,59,.92),rgba(10,23,43,.92));border:1px solid var(--line);border-radius:16px;padding:19px;box-shadow:0 12px 28px rgba(0,0,0,.12)}.card h3,.card h4{margin-top:0}.icon{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:11px;background:#17335e;color:#8dd8ff;font-weight:900;margin-bottom:10px}.note,.warning,.success{border-radius:14px;padding:15px 17px;margin:18px 0;border:1px solid}.note{background:rgba(77,141,255,.09);border-color:rgba(77,141,255,.36)}.warning{background:rgba(255,199,103,.08);border-color:rgba(255,199,103,.38)}.success{background:rgba(67,209,158,.08);border-color:rgba(67,209,158,.38)}.note strong{color:#9fc5ff}.warning strong{color:#ffd58b}.success strong{color:#77e6bc}
    .steps{counter-reset:step;display:grid;gap:12px;margin:18px 0}.step{counter-increment:step;display:grid;grid-template-columns:42px 1fr;gap:14px;align-items:start;background:rgba(13,25,48,.72);border:1px solid var(--line);border-radius:14px;padding:15px}.step::before{content:counter(step);display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--violet));font-weight:850}.step b{color:#fff}.step p{margin:.1rem 0 0}.figure{position:relative;margin:28px 0;background:#050a14;border:1px solid #2a3e60;border-radius:18px;padding:8px;box-shadow:var(--shadow);overflow:hidden}.figure img{display:block;width:100%;height:auto;border-radius:11px}.figure figcaption{padding:12px 8px 5px;color:#8ea2bf;font-size:.82rem}
    table{width:100%;border-collapse:collapse;margin:16px 0;background:rgba(11,23,43,.6);border:1px solid var(--line);border-radius:14px;overflow:hidden;display:table}th,td{text-align:left;vertical-align:top;padding:11px 13px;border-bottom:1px solid rgba(93,119,155,.24)}th{color:#dbeaff;background:#14233e;font-size:.84rem}td{color:#afbed3;font-size:.88rem}tr:last-child td{border-bottom:0}code,kbd{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}code{color:#b9eaff;background:#0a1730;padding:.1rem .35rem;border-radius:5px}kbd{border:1px solid #40516c;border-bottom-width:3px;background:#172238;color:#eaf2ff;padding:.12rem .42rem;border-radius:6px;font-size:.78rem}.format-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 14px}.format-list div{padding:10px 12px;border-bottom:1px solid rgba(90,118,155,.18)}.format-list b{display:block;color:#e7effd}
    .placeholder{min-height:360px;display:grid;place-items:center;text-align:center;border:2px dashed #49658d;border-radius:18px;background:repeating-linear-gradient(135deg,rgba(25,44,75,.55) 0 16px,rgba(14,29,54,.55) 16px 32px);padding:32px;margin:22px 0}.placeholder svg{width:76px;height:76px;margin-bottom:12px;color:#8ebfff}.placeholder h3{margin:.3rem}.placeholder p{max-width:600px;margin:.3rem auto}.placeholder code{display:inline-block;margin-top:10px}.checklist{list-style:none;padding:0}.checklist li{position:relative;padding:.45rem 0 .45rem 2rem;color:#b7c6da}.checklist li::before{content:"✓";position:absolute;left:0;top:.48rem;width:22px;height:22px;display:grid;place-items:center;border-radius:50%;background:rgba(67,209,158,.14);color:var(--green);font-weight:900}
    .lightbox{position:fixed;inset:0;z-index:100;background:rgba(3,7,15,.93);display:none;place-items:center;padding:26px}.lightbox.open{display:grid}.lightbox img{max-width:95vw;max-height:88vh;border-radius:12px;box-shadow:var(--shadow)}.lightbox button{position:absolute;right:22px;top:18px;color:#fff;background:#192640;border:1px solid #53647e;border-radius:50%;width:42px;height:42px;font-size:1.3rem}.figure img{cursor:zoom-in}.footer{margin-top:80px;padding:32px 0;color:#8092ad;border-top:1px solid var(--line);font-size:.85rem}.reveal{opacity:0;transform:translateY(28px)}
    @media(max-width:940px){.layout{display:block}.sidebar{transform:translateX(-105%);transition:transform .25s ease;width:min(88vw,320px)}body.nav-open .sidebar{transform:translateX(0)}.open-nav{display:block}main{padding:0 24px 80px}.hero{grid-template-columns:1fr;min-height:auto}.book-visual{min-height:340px}.topbar{padding:0 13px}.topbar>a{display:none}.section-head{grid-template-columns:52px 1fr}.section-no{font-size:1.8rem}}
    @media(max-width:650px){main{padding-left:16px;padding-right:16px}.hero{padding-top:45px;gap:12px}.book-visual{min-height:270px}.book{inset:38px 18px 20px}.grid2,.grid3,.format-list{grid-template-columns:1fr}.section{padding-top:58px}.section-head{display:block}.section-no{margin-bottom:12px}.card{padding:15px}table{display:block;overflow-x:auto;white-space:normal}.topbar .version{display:none}}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none!important}*{animation:none!important;transition:none!important}}
    @media print{.sidebar,.topbar,.progress,.hero-actions{display:none!important}.layout{display:block;padding:0}main{max-width:none;padding:0;color:#111}.hero{min-height:auto}.book-visual{display:none}.section{break-inside:avoid}.figure{box-shadow:none}.reveal{opacity:1;transform:none}body{background:white;color:#111}.section p,td{color:#333}h1{color:#111;-webkit-text-fill-color:#111}.card{background:#fff;border-color:#bbb}}