/* redhat-v21 manual sandbox style.css - self-contained, Redhat green theme, Thai-leading.
   v21m1. Dark luxury, Sarabun (Google Fonts), responsive, footer centered equal columns, no float. */
:root{
  --bg:#0a0f0d; --bg-card:#0f1814; --bg-card-2:#13201a; --fg:#eaf3ee; --fg-dim:#9fb3a8; --fg-mut:#6f8579;
  --green:#00ab6b; --green-2:#0bd482; --green-deep:#123326; --green-line:rgba(0,171,107,0.28);
  --gold:#D4A853; --r-sm:10px; --r-md:16px; --r-lg:22px; --maxw:1180px;
  --font-body:"IBM Plex Sans Thai","Sarabun","Noto Sans Thai",system-ui,-apple-system,sans-serif;
  --font-display:"IBM Plex Sans Thai","Sarabun","Noto Sans Thai",system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--font-body);line-height:1.7;font-size:17px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--green-2);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{font-family:var(--font-display);line-height:1.25;letter-spacing:-0.01em;margin:0 0 .5em}
h1{font-size:clamp(28px,5vw,44px);font-weight:800}
h2{font-size:clamp(24px,4vw,34px);font-weight:800}
h3{font-size:clamp(19px,3vw,24px);font-weight:700}
p{margin:0 0 1em}
.page{max-width:var(--maxw);margin:0 auto;padding:0 16px}
.skip-link{position:absolute;left:-9999px;top:8px;padding:8px 16px;background:var(--green);color:#04130d;font-weight:700;border-radius:6px;z-index:10000}
.skip-link:focus{left:8px}
/* topnav */
.topnav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;border-bottom:1px solid var(--green-line)}
.brand{display:flex;align-items:center;gap:10px;color:var(--fg);font-weight:800}
.brand-mark{background:linear-gradient(135deg,var(--green),var(--green-deep));color:#04130d;padding:6px 12px;border-radius:8px;font-weight:800;letter-spacing:.5px}
.brand-sub{color:var(--fg-dim);font-size:13px;font-weight:600}
.nav-actions{display:flex;gap:18px;flex-wrap:wrap;font-size:15px;font-weight:600}
.nav-actions a{color:var(--fg-dim)}
.nav-actions a:hover{color:var(--green-2)}
/* hero */
.hero{padding:36px 0 8px;text-align:center}
.hero-eyebrow{color:var(--green-2);font-size:14px;letter-spacing:2px;font-weight:700;margin-bottom:10px;text-transform:uppercase}
.hero h1 .accent{color:var(--green-2)}
.hero p{color:var(--fg-dim);max-width:680px;margin:14px auto 0;font-size:18px}
/* facade slot (empty - clip is a later phase) */
.facade-slot{min-height:1px}
/* quick start */
.quick-start{margin:40px auto;max-width:820px;padding:28px 24px;background:linear-gradient(135deg,rgba(0,171,107,0.10),rgba(10,15,13,0.4));border:1px solid var(--green-line);border-radius:var(--r-md)}
.quick-start .eyebrow{color:var(--green-2);font-size:13px;letter-spacing:2px;font-weight:700;margin-bottom:8px}
.quick-start h2{font-size:26px;margin-bottom:14px}
.quick-start ol{margin:8px 0 0;padding-left:22px}
.quick-start li{margin-bottom:10px}
.quick-start .qs-note{margin-top:14px;color:var(--fg-dim);font-size:15px;border-top:1px dashed var(--green-line);padding-top:12px}
/* chapters grid */
#chapters{padding:56px 0}
#chapters>h2{text-align:center}
#chapters .lead{text-align:center;color:var(--fg-dim);max-width:680px;margin:0 auto 36px;font-size:18px}
.chapters-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;max-width:1280px;margin:0 auto;padding:0 16px}
.rh-card{display:flex;flex-direction:column;height:100%;background:var(--bg-card);border:1px solid var(--green-line);border-radius:var(--r-md);overflow:hidden;color:inherit;transition:transform .25s,box-shadow .25s,border-color .25s}
.rh-card:hover{transform:translateY(-3px);border-color:rgba(0,171,107,0.6);box-shadow:0 10px 32px rgba(0,171,107,0.18)}
.rh-card:hover h3{color:var(--green-2)}
.rh-card img{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
.rh-body{padding:22px 20px;display:flex;flex-direction:column;gap:12px;flex:1}
.rh-tag{font-size:13px;color:var(--green-2);letter-spacing:1.5px;font-weight:700}
.rh-body h3{font-size:20px;color:var(--fg);margin:0}
.rh-body p{color:var(--fg-dim);font-size:14.5px;margin:0;line-height:1.55}
.rh-go{display:inline-flex;align-items:center;gap:8px;color:var(--green-2);font-weight:700;font-size:14.5px;margin-top:auto}
/* download slot (empty - PDF is a later phase) */
.pdf-slot{min-height:1px}
/* chapter page */
.chapter-main{max-width:860px;margin:0 auto;padding:8px 0 64px}
.chapter-eyebrow{color:var(--green-2);font-size:13px;letter-spacing:2px;font-weight:700;margin-bottom:8px}
.chapter-hero{margin:18px 0 28px;border-radius:var(--r-md);overflow:hidden;border:1px solid var(--green-line)}
.chapter-hero img{width:100%;aspect-ratio:16/9;object-fit:cover}
.section{margin:0 0 28px}
.section h2{margin-bottom:12px}
.section ul,.section ol{padding-left:22px}
.section li{margin-bottom:8px}
.pro-tip{border:1px solid var(--green-line);border-left:4px solid var(--green);background:linear-gradient(135deg,rgba(0,171,107,0.08),rgba(10,15,13,0.5));border-radius:var(--r-sm);padding:16px 20px;margin:20px 0}
.pro-tip .tip-label{color:var(--green-2);font-weight:800;font-size:14px;letter-spacing:1px;display:block;margin-bottom:6px}
.faq-item{border:1px solid var(--green-line);border-radius:var(--r-sm);padding:16px 20px;margin:14px 0;background:var(--bg-card)}
.faq-item .q{font-weight:700;color:var(--fg);margin-bottom:6px}
.faq-item .a{color:var(--fg-dim)}
.inline-fig{margin:22px 0;border-radius:var(--r-sm);overflow:hidden;border:1px solid var(--green-line)}
.inline-fig img{width:100%;aspect-ratio:16/9;object-fit:cover}
.inline-fig figcaption{color:var(--fg-mut);font-size:13.5px;padding:8px 12px;text-align:center}
.switch-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:15px}
.switch-table th,.switch-table td{border:1px solid var(--green-line);padding:10px 12px;text-align:left}
.switch-table th{background:var(--bg-card-2);color:var(--green-2);font-weight:700}
.switch-table tr:nth-child(even) td{background:rgba(0,171,107,0.04)}
.chapter-nav{display:flex;justify-content:space-between;gap:16px;margin:40px 0 0;padding-top:24px;border-top:1px solid var(--green-line);flex-wrap:wrap}
.chapter-nav a{color:var(--fg-dim);font-weight:600}
.chapter-nav a:hover{color:var(--green-2)}
.chapter-nav .next{margin-left:auto;text-align:right}
.back-index{display:inline-block;margin-bottom:24px;color:var(--green-2);font-weight:600}
/* author */
.author{margin:56px 0;padding:36px;background:var(--bg-card);border:1px solid var(--green-line);border-radius:var(--r-lg)}
.author .eyebrow{color:var(--green-2);font-size:13px;letter-spacing:2px;font-weight:700;margin-bottom:8px}
/* footer */
footer{margin:64px 0 0;padding:40px 0 24px;border-top:1px solid var(--green-line);text-align:center}
.footer-grid{display:flex;justify-content:center;gap:48px;flex-wrap:wrap;max-width:960px;margin:0 auto 24px}
.footer-col{flex:1 1 240px;min-width:200px;max-width:300px;text-align:center}
.footer-col h3{color:var(--fg);font-size:16px;margin-bottom:10px}
.footer-col a{display:block;color:var(--fg-dim);font-size:14px;margin-bottom:6px}
.footer-col a:hover{color:var(--green-2)}
.footer-bottom{display:flex;flex-direction:column;align-items:center;gap:6px;color:var(--fg-mut);font-size:13px;padding:18px 0;border-top:1px solid var(--green-line);max-width:960px;margin:0 auto}
.footer-bottom .tagline{color:var(--green-2)}
.net-links{text-align:center;margin:24px 0;padding:18px 0;border-top:1px solid var(--green-line);border-bottom:1px solid var(--green-line);color:var(--green-2);font-size:14px}
.net-links a{color:var(--green-2);margin:0 8px}
@media (max-width:640px){
  .footer-grid{flex-direction:column;align-items:center;gap:24px}
  .footer-col{flex:none;text-align:center}
  .topnav{flex-wrap:wrap}
  .nav-actions{font-size:14px;gap:14px}
  body{font-size:16px}
}
@media print{
  body{background:#fff;color:#000}
  .topnav,.chapter-nav,.back-index,.net-links,footer,.rh-progress,.toc-mini,.toc-fab{display:none}
}
/* ===== E4 :: CHAPTER OPENER + READING EXPERIENCE (global, both model & chapter pages) ===== */
.ch-opener{position:relative;padding-top:22vh;padding-bottom:8px;margin:0 0 8px}
.opener-numeral{position:absolute;top:14vh;right:-2px;font-family:"Cormorant Garamond",serif;font-weight:700;font-size:8rem;line-height:1;color:var(--gold);opacity:.28;pointer-events:none;z-index:0;letter-spacing:.02em}
.ch-opener .opener-title{position:relative;z-index:1;font-family:var(--font-display);font-weight:700;font-size:2.6rem;line-height:1.25;letter-spacing:-0.01em;margin:0}
.opener-rule{width:72px;height:1px;background:var(--gold);margin:24px 0 40px;border:0}
.opener-lead{text-indent:0;margin:0 0 20px;font-size:1.15rem;line-height:1.7;color:var(--fg)}
.lead-caps{font-family:var(--font-display);font-weight:600;color:var(--gold);letter-spacing:.02em}
/* PULL QUOTE :: 1 per chapter, from existing Pro-Tip text */
blockquote.pull{margin:30px 0;padding:8px 0 8px 22px;border-left:3px solid var(--gold);font-family:var(--font-display);font-size:1.5rem;line-height:1.45;color:var(--gold);font-weight:600;max-width:60ch}
blockquote.pull p{margin:0;font-size:inherit;color:inherit;line-height:inherit}
/* READING EXPERIENCE :: prose width + visual breaks */
.rh-model .prose,.section .prose{max-width:66ch;line-height:1.85}
.prose-break{margin:28px 0;border:0;border-top:1px dashed var(--green-line);height:0}
/* PROGRESS BAR :: 2px brand on top */
.rh-progress{position:fixed;top:0;left:0;width:100%;height:2px;background:transparent;z-index:9999;pointer-events:none}
.rh-progress i{display:block;height:100%;width:0;background:var(--green-2)}
/* TOC MINI :: sticky right desktop, FAB overlay mobile */
.toc-mini{position:fixed;top:80px;right:16px;width:280px;max-height:calc(100vh - 120px);overflow-y:auto;background:var(--bg-card);border:1px solid var(--green-line);border-radius:var(--r-md);padding:14px 16px;z-index:9998;box-shadow:0 12px 40px rgba(0,0,0,.4);font-size:13.5px;display:none}
.toc-mini.open{display:block}
.toc-mini-inner{display:flex;flex-direction:column;gap:2px}
.toc-mini-h{font-family:var(--font-display);font-weight:700;color:var(--green-2);font-size:13px;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:8px}
.toc-mini a{display:flex;gap:10px;align-items:baseline;padding:5px 4px;color:var(--fg-dim);text-decoration:none;border-radius:6px;line-height:1.4}
.toc-mini a:hover{color:var(--green-2);background:rgba(0,171,107,.06)}
.toc-mini a.is-here{color:var(--green-2);font-weight:700;background:rgba(0,171,107,.08)}
.toc-mini .toc-num{font-family:"Cormorant Garamond",serif;font-weight:700;color:var(--gold);min-width:30px;flex:none;font-size:15px}
.toc-fab{display:none;position:fixed;right:16px;bottom:16px;width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--green),var(--green-deep));color:#04130d;border:none;font-size:22px;font-weight:700;cursor:pointer;z-index:9999;box-shadow:0 8px 24px rgba(0,0,0,.4)}
/* CHAPTER END :: 1-line summary + next link (reading rhythm) */
.chapter-end{margin:40px 0 0;padding:22px 24px;background:var(--bg-card);border:1px solid var(--green-line);border-left:4px solid var(--gold);border-radius:var(--r-sm)}
.chapter-end .chapter-end-summary{margin:0 0 12px;font-size:15.5px;line-height:1.6;color:var(--fg-dim);font-style:italic}
.chapter-end .chapter-end-next{display:inline-flex;align-items:center;gap:8px;color:var(--green-2);font-weight:700;font-size:15px}
.chapter-end .chapter-end-next:hover{text-decoration:underline}
.chapter-end .chapter-nav{margin:14px 0 0;padding-top:14px;border-top:1px dashed var(--green-line)}
@media (max-width:900px){
  .ch-opener{padding-top:14vh}
  .opener-numeral{top:8vh;font-size:5rem}
  .ch-opener .opener-title{font-size:1.9rem}
  .toc-mini{display:none!important}
  .toc-fab{display:flex;align-items:center;justify-content:center}
  blockquote.pull{font-size:1.25rem}
}
@media (min-width:901px){.toc-fab{display:none}}
/* ===== E5 :: INDEX ebook hero + real TOC + author ===== */
.hero-ebook{display:grid;grid-template-columns:minmax(220px,320px) 1fr;gap:40px;align-items:center;padding:40px 0 24px}
.hero-mockup img{width:100%;max-width:320px;height:auto;margin:0 auto;display:block;filter:drop-shadow(0 18px 30px rgba(0,0,0,.55))}
.hero-text{max-width:640px}
.hero-text .hero-eyebrow{color:var(--green-2);font-size:14px;letter-spacing:2px;font-weight:700;margin-bottom:10px;text-transform:uppercase}
.hero-title{font-family:"Cormorant Garamond",serif;font-weight:700;font-size:clamp(48px,8vw,86px);line-height:1;margin:0 0 6px;color:var(--fg);letter-spacing:.01em}
.hero-thai{font-family:var(--font-display);font-weight:700;font-size:clamp(20px,3.4vw,28px);line-height:1.3;color:var(--fg);margin:0 0 18px}
.hero-bullets{list-style:none;margin:0 0 20px;padding:0;display:flex;flex-direction:column;gap:8px}
.hero-bullets li{position:relative;padding-left:22px;color:var(--fg-dim);font-size:16px;line-height:1.5}
.hero-bullets li::before{content:"\u2714";position:absolute;left:0;top:0;color:var(--green-2);font-weight:700}
.hero-meta{color:var(--fg-mut);font-size:14px;margin-bottom:22px;letter-spacing:.2px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:999px;font-weight:700;font-size:15px;text-decoration:none;border:1px solid transparent;transition:transform .2s,box-shadow .2s}
.btn:hover{text-decoration:none;transform:translateY(-2px)}
.btn-primary{background:linear-gradient(135deg,var(--green),var(--green-deep));color:#04130d;box-shadow:0 8px 22px rgba(0,171,107,.3)}
.btn-ghost{background:transparent;color:var(--gold);border-color:var(--gold)}
/* REAL TOC :: dot leaders */
.toc{max-width:760px;margin:48px auto;padding:0 16px}
.toc .eyebrow{color:var(--green-2);font-size:13px;letter-spacing:2px;font-weight:700;text-transform:uppercase;margin-bottom:6px}
.toc h2{font-size:30px;margin:0 0 18px}
.toc-part{font-family:var(--font-display);font-weight:700;color:var(--gold);font-size:15px;letter-spacing:1.5px;text-transform:uppercase;margin:22px 0 6px;padding-bottom:6px;border-bottom:1px solid var(--green-line)}
.toc-part:first-of-type{margin-top:0}
.toc-row{display:flex;align-items:baseline;gap:10px;padding:7px 4px;color:var(--fg);text-decoration:none;border-radius:6px}
.toc-row:hover{background:rgba(0,171,107,.06);color:var(--green-2)}
.toc-row .toc-num{font-family:"Cormorant Garamond",serif;font-weight:700;color:var(--gold);min-width:38px;flex:none;font-size:18px}
.toc-row .toc-title{font-size:16px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.toc-row .toc-leader{flex:1;border-bottom:1px dotted var(--fg-mut);margin:0 6px;position:relative;top:-4px;min-width:20px}
.toc-row .toc-time{font-size:13.5px;color:var(--fg-mut);font-family:"JetBrains Mono",monospace;flex:none;white-space:nowrap}
.toc-row.is-here{color:var(--green-2);font-weight:700}
/* AUTHOR */
.author{margin:56px auto;max-width:820px;padding:32px;background:var(--bg-card);border:1px solid var(--green-line);border-radius:var(--r-lg)}
.author .eyebrow{color:var(--green-2);font-size:13px;letter-spacing:2px;font-weight:700;text-transform:uppercase;margin-bottom:14px}
.author-row{display:flex;gap:22px;align-items:flex-start}
.author-avatar{flex:none;width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,var(--green),var(--green-deep));color:#04130d;font-family:var(--font-display);font-weight:700;font-size:22px;display:flex;align-items:center;justify-content:center}
.author-body h3{font-size:20px;margin:0 0 8px}
.author-body p{color:var(--fg-dim);font-size:15px;line-height:1.6;margin:0 0 12px}
.author-links{display:flex;gap:18px;flex-wrap:wrap}
.author-links a{color:var(--green-2);font-weight:600;font-size:14px}
@media (max-width:760px){
  .hero-ebook{grid-template-columns:1fr;text-align:center;gap:24px;padding:24px 0 8px}
  .hero-mockup img{max-width:240px}
  .hero-text{margin:0 auto}
  .hero-bullets,.hero-cta{justify-content:center}
  .author-row{flex-direction:column;align-items:center;text-align:center}
}
/* ===== E6 :: glossary + risk warning ===== */
.glossary{margin:24px 0;display:flex;flex-direction:column;gap:14px}
.gloss-item{padding:16px 20px;background:var(--bg-card);border:1px solid var(--green-line);border-left:4px solid var(--gold);border-radius:var(--r-sm)}
.gloss-item .g-term{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.gloss-item .g-th{font-family:var(--font-display);font-weight:700;font-size:18px;color:var(--fg)}
.gloss-item .g-en{font-family:"JetBrains Mono",monospace;font-size:13px;color:var(--green-2);letter-spacing:.5px}
.gloss-item .g-def{margin:0;color:var(--fg-dim);font-size:15px;line-height:1.6}
.author--page{margin:8px 0 32px;padding:32px;background:var(--bg-card);border:1px solid var(--green-line);border-radius:var(--r-lg);max-width:none}
.author--page h2{font-size:24px;margin:0 0 12px}
.risk-warning{max-width:960px;margin:18px auto 0;padding:14px 20px;background:rgba(192,57,43,.10);border:1px solid rgba(192,57,43,.4);border-radius:var(--r-sm);color:var(--fg-dim);font-size:13.5px;line-height:1.55;text-align:center}
.risk-warning strong{color:#e57368}
@media print{.risk-warning{display:block;background:#fff;border:1px solid #999;color:#000}}