/* TH24 — Thai SEO landing theme (dark navy + violet), self-hosted, no CDN */
:root{
  --bg:#020617; --bg2:#040c2e; --surface:#0b1229; --surface2:#111a3a;
  --line:rgba(255,255,255,.12); --line2:rgba(139,92,246,.30);
  --txt:#eaedf3; --muted:#a3adbe; --dim:#8593a8;
  --violet:#8b5cf6; --indigo:#6366f1; --gold:#f5c451; --green:#4ade80; --red:#ef4444;
  --radius:16px; --maxw:1180px; --shadow:0 18px 45px rgba(2,6,23,.55);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--txt);
  font-family:"Sarabun",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.75;overflow-x:hidden;
}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
   radial-gradient(900px 480px at 15% -5%,rgba(139,92,246,.20),transparent 60%),
   radial-gradient(760px 420px at 88% 8%,rgba(99,102,241,.16),transparent 62%),
   linear-gradient(180deg,#020617,#040c2e 55%,#020617);}
img{max-width:100%;height:auto;display:block}
a{color:var(--violet);text-decoration:none}
a:hover{color:#a78bfa}
h1,h2,h3,h4{line-height:1.35;margin:0 0 .55em;font-weight:700;letter-spacing:.1px;color:#fff}
h1{font-size:clamp(1.6rem,3.4vw,2.5rem)}
h2{font-size:clamp(1.25rem,2.3vw,1.7rem);margin-top:1.6em}
h3{font-size:clamp(1.05rem,1.7vw,1.28rem);margin-top:1.25em}
p{margin:0 0 1.05em}
strong{color:#fff}
ul,ol{margin:0 0 1.1em;padding-left:1.35em}
li{margin:.35em 0}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:20px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--violet);color:#fff;padding:10px 16px;z-index:999}
.skip-link:focus{left:8px;top:8px;border-radius:8px}
main{display:block;padding-bottom:8px}
section{padding:38px 0}
.sec-alt{background:linear-gradient(180deg,rgba(139,92,246,.06),rgba(99,102,241,.03));border-block:1px solid var(--line)}
.eyebrow{display:inline-block;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;color:#c4b5fd;
  background:rgba(139,92,246,.16);border:1px solid var(--line2);border-radius:999px;padding:5px 14px;margin-bottom:14px;font-weight:600}
.lead{font-size:1.06rem;color:#dbe1ee}

/* ── header ── */
.site-header{position:sticky;top:0;z-index:60;backdrop-filter:blur(14px);
  background:rgba(2,6,23,.82);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:18px;min-height:68px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;color:#fff;font-size:1.24rem;flex-shrink:0}
.logo:hover{color:#fff}
.logo-icon{width:36px;height:36px;border-radius:10px;flex-shrink:0}
.logo-text{background:linear-gradient(92deg,#a78bfa,#f5c451);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:.5px}
.main-nav{margin-left:auto}
.nav-list{list-style:none;display:flex;gap:4px;margin:0;padding:0;flex-wrap:wrap}
.nav-list a{color:#cbd5e1;padding:8px 11px;border-radius:9px;font-size:.94rem;font-weight:600;white-space:nowrap}
.nav-list a:hover,.nav-list a.active{color:#fff;background:rgba(139,92,246,.20)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;
  border-radius:12px;padding:12px 22px;border:1px solid transparent;cursor:pointer;
  font-family:inherit;font-size:1rem;line-height:1.2;transition:transform .15s,box-shadow .15s,filter .15s;text-align:center}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:linear-gradient(95deg,#8b5cf6,#6366f1);color:#fff;box-shadow:0 12px 30px rgba(99,102,241,.38)}
.btn-primary:hover{color:#fff;filter:brightness(1.08)}
.btn-gold{background:linear-gradient(95deg,#f5c451,#f59e0b);color:#231a02;box-shadow:0 12px 30px rgba(245,196,81,.32)}
.btn-gold:hover{color:#231a02;filter:brightness(1.06)}
.btn-ghost{background:rgba(255,255,255,.06);border-color:var(--line);color:#e2e8f0}
.btn-ghost:hover{color:#fff;background:rgba(139,92,246,.18)}
.btn-lg{padding:15px 30px;font-size:1.08rem;border-radius:14px}
.btn-block{width:100%}
.header-cta{padding:10px 18px;font-size:.94rem}
.mobile-menu-toggle{display:none;background:none;border:1px solid var(--line);border-radius:10px;padding:9px 12px;cursor:pointer}
.hamburger,.hamburger::before,.hamburger::after{display:block;width:20px;height:2px;background:#e2e8f0;border-radius:2px;position:relative}
.hamburger::before,.hamburger::after{content:"";position:absolute;left:0}
.hamburger::before{top:-6px}.hamburger::after{top:6px}

/* ── hero ── */
.hero{padding:52px 0 34px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:38px;align-items:center}
.hero h1{margin-bottom:.5em}
.hero p{font-size:1.08rem;color:#d7dded}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0 16px}
.hero-stats{display:flex;gap:26px;flex-wrap:wrap;margin-top:18px;padding-top:18px;border-top:1px solid var(--line)}
.stat b{display:block;font-size:1.5rem;color:var(--gold);font-weight:800}
.stat span{font-size:.86rem;color:var(--muted)}
.hero-media{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line2);box-shadow:var(--shadow)}
.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover}
.hero-badge{position:absolute;left:14px;bottom:14px;background:rgba(2,6,23,.82);border:1px solid var(--line2);
  border-radius:12px;padding:9px 15px;font-size:.88rem;font-weight:700;color:#fff;backdrop-filter:blur(6px)}

/* ── cards ── */
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:linear-gradient(160deg,var(--surface),var(--bg2));border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;transition:transform .18s,border-color .18s;height:100%;
  display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);border-color:var(--line2)}
.card-img{width:100%;aspect-ratio:16/10;object-fit:cover}
.card-body{padding:18px 20px 22px;flex:1;display:flex;flex-direction:column}
.card-body h3{margin-top:0;font-size:1.12rem}
.card-body p{color:var(--muted);font-size:.96rem;margin-bottom:.7em}
.card-txt{color:var(--muted);font-size:.96rem;line-height:1.7;margin:0 0 .7em}
h2[id],h3[id],section[id],div[id]{scroll-margin-top:92px}
.card-meta{margin-top:auto;font-size:.85rem;color:#c4b5fd;font-weight:600}
.pill{display:inline-block;background:rgba(139,92,246,.16);border:1px solid var(--line2);color:#ddd6fe;
  border-radius:999px;padding:3px 11px;font-size:.78rem;font-weight:600;margin:0 6px 6px 0}
.feat{background:linear-gradient(160deg,rgba(139,92,246,.10),rgba(99,102,241,.04));border:1px solid var(--line);
  border-radius:var(--radius);padding:22px}
.feat .ico{width:42px;height:42px;border-radius:11px;background:linear-gradient(140deg,#8b5cf6,#6366f1);
  display:flex;align-items:center;justify-content:center;font-size:1.2rem;margin-bottom:12px;color:#fff}
.feat h3{font-size:1.06rem;margin-bottom:.4em}
.feat-txt{color:var(--muted);font-size:.95rem;margin:0;line-height:1.7}

/* ── steps ── */
.steps{counter-reset:st;display:grid;gap:18px;grid-template-columns:repeat(4,1fr)}
.step{position:relative;padding:24px 20px 20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
.step::before{counter-increment:st;content:counter(st);position:absolute;top:-16px;left:20px;width:34px;height:34px;
  border-radius:50%;background:linear-gradient(140deg,#f5c451,#f59e0b);color:#231a02;font-weight:800;
  display:flex;align-items:center;justify-content:center;font-size:1rem}
.step h3{font-size:1rem;margin:8px 0 .4em}
.step-txt{color:var(--muted);font-size:.92rem;margin:0;line-height:1.7}

/* ── toc / anchors ── */
.toc{background:linear-gradient(160deg,rgba(139,92,246,.12),rgba(99,102,241,.05));
  border:1px solid var(--line2);border-radius:var(--radius);padding:22px 24px;margin:0 0 30px}
.toc h2{margin:0 0 .6em;font-size:1.15rem}
.toc ol{margin:0;padding-left:1.3em;columns:2;column-gap:28px}
.toc a{color:#ddd6fe;font-weight:600;font-size:.97rem}
.anchor-alias{display:block;position:relative;top:-84px;visibility:hidden}

/* ── tables ── */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);margin:18px 0 26px;background:var(--surface)}
table.data-table{width:100%;border-collapse:collapse;min-width:520px;font-size:.95rem}
.data-table caption{text-align:left;padding:14px 18px 0;color:#c4b5fd;font-weight:700;font-size:.92rem}
.data-table thead th{background:rgba(139,92,246,.18);color:#fff;text-align:left;font-weight:700;
  padding:13px 16px;border-bottom:1px solid var(--line2);white-space:nowrap}
.data-table td{padding:12px 16px;border-bottom:1px solid var(--line);color:#dbe1ee;vertical-align:top}
.data-table tbody tr:nth-child(even){background:rgba(255,255,255,.02)}
.data-table tbody tr:hover{background:rgba(139,92,246,.08)}
.data-table td:first-child{font-weight:600;color:#fff}
.tbl-note{font-size:.86rem;color:var(--dim);padding:10px 16px 14px}

/* ── FAQ ── */
details.faq{border:1px solid var(--line);border-radius:13px;background:var(--surface);margin-bottom:12px;overflow:hidden}
details.faq[open]{border-color:var(--line2);background:linear-gradient(160deg,rgba(139,92,246,.10),var(--surface))}
details.faq summary{list-style:none;cursor:pointer;padding:16px 52px 16px 18px;font-weight:700;color:#fff;
  position:relative;font-size:1.02rem}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);
  font-size:1.4rem;color:var(--violet);font-weight:700;transition:transform .2s}
details.faq[open] summary::after{content:"–"}
details.faq .faq-a{padding:0 18px 18px;color:var(--muted);font-size:.99rem}
details.faq .faq-a p:last-child{margin-bottom:0}

/* ── cta band ── */
.cta-band{background:linear-gradient(115deg,rgba(139,92,246,.22),rgba(99,102,241,.12));
  border:1px solid var(--line2);border-radius:22px;padding:38px 34px;text-align:center;margin:34px 0}
.cta-band h2{margin-top:0}
.cta-band p{color:#dbe1ee;max-width:720px;margin-inline:auto}
.cta-band .btn{margin:8px 6px 0}
.inline-cta{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  background:rgba(139,92,246,.10);border:1px solid var(--line2);border-radius:14px;padding:16px 20px;margin:24px 0}
.inline-cta p,.inline-cta .icta-txt{margin:0;font-weight:600;color:#e9e5ff}

/* ── misc blocks ── */
.note{background:rgba(245,196,81,.08);border:1px solid rgba(245,196,81,.32);border-left-width:5px;
  border-radius:12px;padding:16px 20px;margin:20px 0;font-size:.97rem;color:#f7e6bb}
.note strong{color:var(--gold)}
.warn{background:rgba(239,68,68,.08);border:1px solid rgba(239,68,68,.32);border-left-width:5px;
  border-radius:12px;padding:16px 20px;margin:20px 0;font-size:.97rem;color:#fbc9c9}
.ok{background:rgba(74,222,128,.08);border:1px solid rgba(74,222,128,.30);border-left-width:5px;
  border-radius:12px;padding:16px 20px;margin:20px 0;font-size:.97rem;color:#c8f7d8}
.page-hero{padding:44px 0 26px;border-bottom:1px solid var(--line);background:rgba(139,92,246,.05)}
.page-hero h1{margin-bottom:.35em}
.page-hero .lead{max-width:820px}
.crumbs{font-size:.86rem;color:var(--dim);margin-bottom:12px}
.crumbs a{color:#c4b5fd}
figure{margin:24px 0}
figure img{border-radius:var(--radius);border:1px solid var(--line);width:100%}
figcaption{font-size:.86rem;color:var(--dim);margin-top:9px;text-align:center}
.img-duo{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:26px 0}
.img-duo img{width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--radius);border:1px solid var(--line)}
.trust-row{display:flex;gap:28px;flex-wrap:wrap;align-items:center;justify-content:center;padding:22px 0;opacity:.92}
.trust-row img{height:34px;width:auto}

/* ── footer ── */
.site-footer{border-top:1px solid var(--line);background:rgba(2,6,23,.92);margin-top:40px;padding:44px 0 22px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1.2fr;gap:30px}
.site-footer h4{font-size:.98rem;margin:0 0 .8em;color:#fff}
.footer-tagline{color:var(--muted);font-size:.93rem;margin:.8em 0}
.footer-badges{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.footer-badges img{height:28px;width:auto;opacity:.9}
.footer-nav ul{list-style:none;padding:0;margin:0}
.footer-nav li{margin:.42em 0}
.footer-nav a{color:var(--muted);font-size:.93rem}
.footer-nav a:hover{color:#c4b5fd}
.footer-contact p{color:var(--muted);font-size:.92rem;margin:.35em 0}
.footer-contact a{color:#c4b5fd}
.footer-contact .btn{margin-top:12px}
.footer-bottom{border-top:1px solid var(--line);margin-top:32px;padding-top:20px;font-size:.84rem;color:var(--dim);text-align:center}
.footer-bottom p{margin:.35em 0}
.footer-bottom a{color:#c4b5fd}
.disclaimer{max-width:900px;margin-inline:auto}
.license{color:#6b7891}

@media(max-width:1000px){
  .hero-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .g4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:820px){
  body{font-size:16px}
  .mobile-menu-toggle{display:block;margin-left:auto}
  .main-nav{position:fixed;inset:68px 0 auto;background:rgba(2,6,23,.98);border-bottom:1px solid var(--line);
    padding:14px 20px 22px;display:none}
  .main-nav.open{display:block}
  .nav-list{flex-direction:column;gap:2px}
  .nav-list a{display:block;padding:11px 12px;font-size:1rem}
  .header-cta{display:none}
  .g3,.g2{grid-template-columns:1fr}
  .img-duo{grid-template-columns:1fr}
  .toc ol{columns:1}
  .cta-band{padding:28px 20px}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:520px){ .g4{grid-template-columns:1fr} .steps{grid-template-columns:1fr} }