:root{--paper:#F8FAFC;--ink:#0F172A;--text:#1E293B;--muted:#475569;--navy:#0B2545;--blue:#1D4ED8;--line:#DBE4F0;--teal:#0F766E;--teal-bg:#F0FDFA;--amber:#92400E;--amber-bg:#FFFBEB}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:'Noto Sans Thai',sans-serif;background:var(--paper);color:var(--text);font-size:17px;line-height:1.75;word-break:break-word;overflow-wrap:break-word;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{color:var(--ink);line-height:1.5;font-weight:700}
a{color:var(--blue)}
.kd-container{max-width:1180px;margin:0 auto;padding:0 20px}
.kd-progress{position:fixed;top:0;left:0;height:3px;width:0;background:#60A5FA;z-index:100}
.kd-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.kd-header-in{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px}
.kd-brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.kd-brand small{display:block;font-size:13px;color:var(--muted);line-height:1.4}
.kd-mark{width:40px;height:40px;border-radius:10px;background:var(--navy);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:15px}
.kd-nav{display:flex;flex-wrap:wrap;gap:4px}
.kd-nav a{color:var(--ink);text-decoration:none;font-weight:600;font-size:15px;padding:8px 12px;border-radius:8px;line-height:1.4}
.kd-nav a:hover,.kd-nav a[aria-current]{background:#EFF6FF;color:var(--blue)}
.kd-burger{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 12px;font-size:20px;cursor:pointer}
@media(max-width:900px){.kd-burger{display:block}.kd-nav{display:none;position:absolute;left:0;right:0;top:68px;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;padding:10px 20px}.kd-nav-open .kd-nav{display:flex}}
.kd-hero{background-color:var(--navy);background-image:linear-gradient(rgba(147,197,253,.10) 1px,transparent 1px),linear-gradient(90deg,rgba(147,197,253,.10) 1px,transparent 1px);background-size:28px 28px;color:#fff;padding:44px 0 52px}
.kd-hero h1{color:#fff;font-size:clamp(26px,3.6vw,40px);margin:8px 0 12px;max-width:900px}
.kd-eyebrow{color:#BFDBFE;font-size:14px;font-weight:600}
.kd-lead{color:#E2E8F0;font-size:18px;max-width:780px;margin:0}
.kd-crumbs{font-size:14px;color:#BFDBFE;margin-bottom:10px;display:flex;flex-wrap:wrap;gap:6px}
.kd-crumbs a{color:#DBEAFE;text-decoration:none}
.kd-main{padding-top:36px;padding-bottom:20px}
.kd-section{padding:36px 0 0}
.kd-h2{font-size:26px;margin:0 0 18px}
.kd-hubs{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media(max-width:900px){.kd-hubs{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.kd-hubs{grid-template-columns:1fr}}
.kd-hub{display:flex;flex-direction:column;gap:4px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;color:var(--text);transition:border-color .15s,transform .15s}
.kd-hub:hover{border-color:var(--blue);transform:translateY(-2px)}
.kd-hub strong{color:var(--ink);font-size:17px;line-height:1.5}
.kd-hub span:last-child{font-size:14px;color:var(--muted);line-height:1.65}
.kd-hub-icon{font-size:26px}
.kd-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:900px){.kd-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.kd-grid{grid-template-columns:1fr}}
.kd-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;text-decoration:none;color:var(--text)}
.kd-card:hover{border-color:var(--blue)}
.kd-card h3{font-size:17px;margin:8px 0;color:var(--ink)}
.kd-card p{font-size:15px;color:var(--muted);margin:0;line-height:1.7}
.kd-card-tag{font-size:13px;font-weight:600;color:var(--blue)}
.kd-card--accent{border-color:var(--blue)}
.kd-tool-cta{display:flex;align-items:center;gap:18px;background:#fff;border:1px solid var(--blue);border-radius:16px;padding:22px;text-decoration:none;color:var(--text)}
.kd-tool-cta>span{font-size:36px}
.kd-tool-cta strong{color:var(--ink);font-size:19px}
.kd-tool-cta p{margin:2px 0 0;color:var(--muted)}
.kd-tool-cta b{margin-left:auto;color:var(--blue);white-space:nowrap}
@media(max-width:600px){.kd-tool-cta{flex-wrap:wrap}.kd-tool-cta b{margin-left:0}}
.kd-disclosure,.kd-planned{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px}
.kd-planned{margin-top:20px}
.kd-disclosure p{margin:6px 0 0;color:var(--muted)}
.kd-article-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:40px;align-items:start}
@media(max-width:960px){.kd-article-grid{grid-template-columns:1fr}.kd-toc{display:none}}
.kd-prose{max-width:780px}
.kd-prose--solo{max-width:820px}
.kd-prose h2{font-size:25px;margin:38px 0 12px;scroll-margin-top:90px}
.kd-prose h3{font-size:20px;margin:26px 0 8px}
.kd-prose ul,.kd-prose ol{padding-left:22px}
.kd-prose li{margin-bottom:6px}
.kd-summary{background:#EFF6FF;border:1px solid #BFDBFE;border-radius:12px;padding:18px 20px}
.kd-summary p{margin:6px 0 0}
.kd-table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:#fff;margin:16px 0}
.kd-table{width:100%;border-collapse:collapse;font-size:15px}
.kd-table th{background:var(--navy);color:#fff;text-align:left;padding:12px 14px;font-weight:600}
.kd-table td{padding:12px 14px;border-top:1px solid var(--line);vertical-align:top}
.kd-table tr:nth-child(even) td{background:#F8FAFC}
.kd-num{font-family:'IBM Plex Mono',monospace;white-space:nowrap}
.kd-spec{font-family:'IBM Plex Mono',monospace;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;font-size:15px;line-height:1.9;margin:14px 0;overflow-x:auto}
.kd-tip,.kd-warn{border-radius:12px;padding:16px 20px;margin:20px 0}
.kd-tip{background:var(--teal-bg);border-left:5px solid var(--teal);color:#134E4A}
.kd-tip strong{color:var(--teal)}
.kd-warn{background:var(--amber-bg);border-left:5px solid var(--amber);color:#78350F}
.kd-warn strong{color:var(--amber)}
.kd-tip p,.kd-warn p{margin:6px 0 0}
.kd-faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
.kd-faq summary{cursor:pointer;font-weight:600;color:var(--ink);line-height:1.6}
.kd-faq p{margin:8px 0 0}
.kd-sources{font-size:15px;color:var(--muted)}
.kd-author{display:flex;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin-top:36px}
.kd-author img{width:96px;height:auto}
.kd-author p{margin:4px 0 0;font-size:14px;color:var(--muted)}
.kd-toc{position:sticky;top:90px}
.kd-toc-in{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;font-size:15px}
.kd-toc ol{padding-left:20px;margin:10px 0 0}
.kd-toc li{margin-bottom:6px;line-height:1.55}
.kd-toc a{text-decoration:none}
.kd-toc-cta{border-top:1px solid var(--line);margin-top:14px;padding-top:12px}
.kd-toc-cta p{margin:4px 0 0;color:var(--muted);font-size:14px}
.kd-related{padding:44px 0 10px}
.kd-related h2{font-size:24px}
.kd-tool{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;margin-bottom:10px}
.kd-tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:600px){.kd-tool-grid{grid-template-columns:1fr}}
.kd-tool label{font-weight:600;color:var(--ink);font-size:15px}
.kd-tool input,.kd-tool select{display:block;width:100%;margin-top:6px;border:1px solid #CBD5E1;border-radius:10px;padding:10px 12px;font-size:16px;font-family:inherit;line-height:1.5;background:#fff;color:var(--ink)}
.kd-result{margin-top:18px;background:var(--navy);color:#E2E8F0;border-radius:12px;padding:18px 20px}
.kd-result strong{color:#fff}
.kd-result-big{font-size:24px;font-weight:700;color:#fff;margin-top:4px;line-height:1.5}
.kd-glossary dt{font-weight:700;color:var(--ink);margin-top:16px}
.kd-glossary dd{margin:2px 0 0 0;color:var(--text)}
.kd-footer{background:var(--navy);color:#CBD5E1;margin-top:56px;padding:36px 0 24px;font-size:15px}
.kd-footer strong{color:#fff}
.kd-footer a{color:#BFDBFE}
.kd-footer-grid{display:grid;grid-template-columns:1.2fr 1.5fr 1fr;gap:28px}
@media(max-width:800px){.kd-footer-grid{grid-template-columns:1fr}}
.kd-footer p{margin:6px 0 0;line-height:1.75}
.kd-legal{border-top:1px solid rgba(255,255,255,.15);margin-top:24px;padding-top:16px;font-size:14px}
.kd-fig{margin:20px 0;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.kd-fig img{display:block;width:100%;aspect-ratio:4/3;object-fit:cover;background:#E2E8F0}
.kd-fig figcaption{padding:12px 16px;font-size:14px;color:var(--muted);line-height:1.65;border-top:1px solid var(--line)}
.kd-fig-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
@media(max-width:680px){.kd-fig-grid{grid-template-columns:1fr}}
.kd-fig-grid .kd-fig{margin:0}
.kd-video-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.kd-video{position:relative;width:100%;aspect-ratio:16/9;background:#0F172A}
.kd-video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.kd-video-cap{margin:0;padding:12px 16px;font-size:14px;color:var(--muted);line-height:1.65;border-top:1px solid var(--line)}