:root{--ink:#1d2b3a;--paper:#fbfbf8;--accent:#ff9f43;--accent2:#3d84f7;--sky:#e8f1ff;--muted:#697280;--line:#e2e4e0;--card:#fff;--chip:#f1f3f0;--brand:#1d2b3a}
:root[data-theme="dark"]{--ink:#eef1f5;--paper:#12181f;--muted:#9aa4b2;--line:#2a323d;--card:#1a222c;--chip:#1f2731}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Noto Sans Thai",sans-serif}
.site-header{height:76px;max-width:1180px;margin:auto;padding:0 26px;display:flex;align-items:center;justify-content:space-between}
.brand{font:700 32px/1 "DM Sans","Noto Sans Thai",sans-serif;color:var(--ink);text-decoration:none;letter-spacing:-1px}
.brand span{color:var(--accent2)}
.site-header nav{display:flex;gap:26px;align-items:center}
.site-header nav a{color:var(--ink);text-decoration:none;font-size:15px;font-weight:600}
.hero{max-width:1180px;margin:0 auto;padding:92px 26px 90px}
.eyebrow{margin:0 0 16px;text-transform:uppercase;letter-spacing:1.1px;font:700 12px/1.4 "DM Sans","Noto Sans Thai",sans-serif;color:var(--accent2)}
.hero h1{font-size:clamp(38px,6vw,64px);letter-spacing:-1.5px;line-height:1.3;margin:0}
.hero h1 em{font-style:normal;color:var(--accent2)}
.hero-copy{font-size:18px;max-width:560px;margin:22px 0 30px;line-height:1.85;color:var(--muted)}
.button{appearance:none;border:0;background:var(--brand);color:#fff;border-radius:999px;padding:14px 23px;text-decoration:none;font:600 15px "Noto Sans Thai",sans-serif;cursor:pointer;display:inline-flex;gap:10px;align-items:center}
.button:hover{background:#324258}
.tools-section,.guide-section{max-width:1180px;margin:auto;padding:60px 26px}
.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:26px}
.section-heading h2{font-size:30px;letter-spacing:-1px;margin:0}
.section-heading a{color:var(--accent2);font-weight:700;text-decoration:none;font-size:14px}
.tool-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.tool-card{background:var(--card);border:1px solid var(--line);padding:20px;border-radius:16px;text-decoration:none;color:var(--ink)}
.tool-card h3{font-size:16px;margin:0;letter-spacing:-.3px}
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:10px}
.guide-card{background:var(--brand);color:#fff;text-decoration:none;padding:26px;border-radius:16px;min-height:190px;display:flex;flex-direction:column}
.guide-card:nth-child(3n+2){background:var(--accent2)}
.guide-card:nth-child(3n+3){background:var(--accent);color:#2a1c00}
.guide-card span{font:700 12px "DM Sans";opacity:.75;text-transform:uppercase}
.guide-card h3{font-size:18px;line-height:1.4;margin:14px 0 6px}
.guide-card p{font-size:12px;line-height:1.6;margin:0;opacity:.85}
footer{border-top:1px solid var(--line);max-width:1180px;margin:auto;padding:34px 26px 45px;display:flex;gap:20px;align-items:center;flex-wrap:wrap}
footer p{font-size:12px;color:var(--muted);margin:0}
.footer-links{display:flex;gap:18px;margin-left:auto}
.footer-links a{font-size:12px;color:var(--ink);text-decoration:none}
.theme-toggle{border:1px solid var(--line);background:var(--card);color:var(--ink);width:34px;height:34px;border-radius:999px;cursor:pointer;font-size:14px;padding:0;display:grid;place-items:center}
.theme-toggle:hover{border-color:var(--ink)}

.article-page{max-width:820px;margin:0 auto;padding:70px 26px 100px}
.article-page>h1{font-size:clamp(34px,5vw,50px);line-height:1.35;letter-spacing:-1px;margin:0}
.article-intro{font-size:18px;line-height:1.75;color:var(--muted);max-width:640px;margin:20px 0 36px}
.eyebrow a{color:inherit;text-decoration:none;border-bottom:1px solid currentColor}
.prose{max-width:680px}
.prose h2{font-size:24px;letter-spacing:-.6px;margin:40px 0 12px;scroll-margin-top:20px}
.prose h3{font-size:18px;margin:26px 0 8px}
.prose p,.prose li{color:var(--ink);font-size:16px;line-height:1.95}
.prose ul,.prose ol{padding-left:22px}
.prose li{padding-left:4px;margin:6px 0}
.prose a{color:var(--accent2);font-weight:700}
.prose hr{border:0;border-top:1px solid var(--line);margin:36px 0}
.table-wrap{overflow-x:auto;margin:20px 0}
.spec-table{width:100%;border-collapse:collapse;font-size:14px}
.spec-table th,.spec-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
.spec-table th{background:var(--chip);font-weight:700;color:var(--ink)}
.toc{border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:0 0 44px;display:grid;grid-template-columns:1fr 1fr;gap:2px 24px}
.toc-label{grid-column:1/-1;margin:0 0 8px;font:700 12px "DM Sans","Noto Sans Thai",sans-serif;text-transform:uppercase;letter-spacing:1px;color:var(--accent2)}
.toc a{color:var(--ink);text-decoration:none;font-size:14px;line-height:1.95;border-bottom:1px solid var(--line);padding:2px 0}
.toc a:hover{color:var(--accent2)}
.faq-section{margin-top:50px;max-width:680px}
.faq-section h2{font-size:22px;margin:0 0 16px}
.faq-item{padding:16px 0;border-top:1px solid var(--line)}
.faq-q{font-weight:700;margin:0 0 6px}
.faq-a{color:var(--muted);margin:0}
.prose-note{margin-top:30px;max-width:680px;color:var(--muted);font-size:13px}
.prose-note p{font-size:13px;color:var(--muted)}

.articles-index{max-width:1020px;margin:0 auto;padding:70px 26px 100px}
.articles-index h1{font-size:40px;letter-spacing:-1px;margin:10px 0 24px}
.search-wrap{margin:0 0 24px}
.article-search{width:100%;max-width:420px;border:1px solid var(--line);border-radius:999px;padding:12px 18px;background:var(--card);color:var(--ink);font:500 14px "Noto Sans Thai",sans-serif}
.category-nav{position:sticky;top:0;z-index:5;display:flex;flex-wrap:wrap;gap:8px;margin:0 0 40px;padding:14px 0;background:var(--paper);border-bottom:1px solid var(--line)}
.category-nav a{font:600 13px "Noto Sans Thai",sans-serif;color:var(--ink);text-decoration:none;padding:8px 15px;border:1px solid var(--line);border-radius:999px;background:var(--card);white-space:nowrap}
.category-nav a:hover{border-color:var(--ink)}
.article-group{margin-top:40px;scroll-margin-top:74px}
.article-group h2{font-size:19px;letter-spacing:-.4px;margin:0 0 14px;color:var(--accent2)}
.article-list{display:grid;gap:10px}
.article-row{display:flex;align-items:center;gap:16px;padding:18px 20px;border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--ink);background:var(--card)}
.article-row:hover{border-color:var(--ink)}
.article-info{flex:1;display:grid;gap:4px}
.article-info b{font-size:15px;letter-spacing:-.2px}
.article-info small{font-size:12px;color:var(--muted);line-height:1.6}
.article-arrow{flex-shrink:0;color:var(--muted);font-size:18px}
@media(min-width:720px){.article-list{grid-template-columns:1fr 1fr}}
@media(max-width:900px){.tool-grid{grid-template-columns:repeat(3,1fr)}.guide-grid{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.site-header nav a:not(.theme-toggle){display:none}.hero{padding:55px 20px 60px}.tool-grid{grid-template-columns:1fr 1fr}.guide-grid{grid-template-columns:1fr}.toc{grid-template-columns:1fr}.article-page{padding-top:45px}}