/* ============================================================
   P602 — Stylesheet (self-contained · ไม่มี CDN)
   ธีม: dark navy + violet/indigo (ตามผังดีไซน์เว็บตัวอย่าง)
   ============================================================ */

:root{
  --bg:#020617;
  --surface:#040c2e;
  --surface-2:#071042;
  --card:#060e33;
  --text:#eaedf3;
  --heading:#f8fafc;
  --muted:#a3adbe;
  --primary:#8b5cf6;
  --accent:#6366f1;
  --on-primary:#0b0320;
  --border:rgba(255,255,255,.12);
  --border-2:rgba(139,92,246,.35);
  --good:#34d399;
  --warn:#fbbf24;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 18px 44px rgba(2,6,23,.65);
  --glow:0 0 32px rgba(139,92,246,.45);
  --maxw:1180px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Sarabun","Noto Sans Thai","Leelawadee UI",Tahoma,"Segoe UI",system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--text);
  font-size:1rem;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{color:var(--heading);font-weight:700;line-height:1.3}
a{color:var(--primary);text-decoration:none;transition:color .18s}
a:hover{color:var(--accent)}
img,svg{max-width:100%;height:auto;display:block}
ul,ol{padding-left:1.35rem}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--primary);color:var(--on-primary);
  padding:10px 18px;border-radius:0 0 8px 0;z-index:99;font-weight:700}
.skip-link:focus{left:0}

/* ---------- TOP BAR ---------- */
.topbar{background:linear-gradient(90deg,var(--surface),var(--surface-2));
  border-bottom:1px solid var(--border);font-size:.85rem}
.topbar-inner{display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;align-items:center;padding:8px 20px}
.topbar-text{color:var(--muted)}
.topbar-reg a{font-weight:700;color:var(--heading);background:linear-gradient(135deg,var(--primary),var(--accent));
  padding:4px 14px;border-radius:50px;display:inline-block}
.topbar-reg a:hover{color:var(--on-primary);box-shadow:var(--glow)}

/* ---------- HEADER ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(4,12,46,.94);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;gap:18px;padding:12px 20px}
.logo{display:flex;align-items:baseline;gap:8px}
.logo-mark{font-size:1.6rem;font-weight:800;letter-spacing:1px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.logo-sub{font-size:.72rem;color:var(--muted);letter-spacing:.5px}
.main-nav{margin-left:auto}
.nav-toggle{display:none;background:transparent;border:1px solid var(--border);color:var(--text);
  border-radius:8px;padding:8px 14px;font-family:inherit;font-size:.95rem;cursor:pointer}
.nav-list{display:flex;flex-wrap:wrap;gap:2px;list-style:none;padding:0}
.nav-list a{display:block;padding:6px 13px;border-radius:8px;color:var(--muted);
  font-weight:600;font-size:.95rem}
.nav-list a:hover,.nav-list a.active{color:var(--heading);background:rgba(139,92,246,.16)}
.header-cta{display:flex;gap:8px}

/* ---------- BUTTONS ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:inherit;
  font-weight:700;font-size:.98rem;padding:12px 28px;border-radius:50px;border:none;cursor:pointer;
  text-align:center;transition:transform .22s,box-shadow .22s,background .22s}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--accent));color:var(--on-primary);
  box-shadow:var(--glow)}
.btn-primary:hover{color:var(--on-primary);transform:translateY(-3px);
  box-shadow:0 0 48px rgba(139,92,246,.75)}
.btn-ghost{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.btn-ghost:hover{background:var(--primary);color:var(--on-primary);box-shadow:var(--glow)}
.btn-sm{padding:9px 20px;font-size:.9rem}
.btn-lg{padding:15px 38px;font-size:1.05rem}

/* ---------- HERO ---------- */
.hero{position:relative;padding:64px 0 56px;overflow:hidden;
  background:radial-gradient(1100px 520px at 8% -8%,rgba(139,92,246,.30),transparent 62%),
             radial-gradient(900px 460px at 96% 6%,rgba(99,102,241,.26),transparent 60%),var(--bg)}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.hero-eyebrow{display:inline-block;background:rgba(139,92,246,.18);border:1px solid var(--border-2);
  color:#c4b5fd;border-radius:50px;padding:6px 20px;font-size:.86rem;font-weight:600;
  letter-spacing:.4px;margin-bottom:16px}
.hero h1{font-size:clamp(1.9rem,4.3vw,3rem);font-weight:800;margin-bottom:16px}
.hero h1 span{background:linear-gradient(135deg,var(--primary),var(--accent));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero-lead{color:var(--muted);font-size:1.06rem;margin-bottom:26px;max-width:640px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:28px}
.hero-stats{display:flex;flex-wrap:wrap;gap:26px;list-style:none;padding:0}
.hero-stats li{display:flex;flex-direction:column}
.hero-stats strong{font-size:1.5rem;font-weight:800;color:var(--primary)}
.hero-stats span{font-size:.85rem;color:var(--muted)}
.hero-art{border-radius:var(--radius);overflow:hidden;border:1px solid var(--border-2);
  box-shadow:var(--shadow)}

/* ---------- JACKPOT BAND ---------- */
.jackpot{background:var(--surface);border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);padding:44px 0;text-align:center}
.jackpot-label{font-size:.9rem;color:var(--muted);letter-spacing:2px;text-transform:uppercase}
.jackpot-amount{font-size:clamp(2.4rem,7vw,4.2rem);font-weight:800;color:var(--primary);
  text-shadow:0 0 40px rgba(139,92,246,.75)}
.jackpot-sub{color:var(--muted);font-size:.95rem;margin-top:6px}

/* ---------- SECTIONS ---------- */
.section{padding:64px 0}
.section-alt{background:var(--surface);border-top:1px solid var(--border);
  border-bottom:1px solid var(--border)}
.section-title{font-size:clamp(1.5rem,3vw,2rem);font-weight:800;margin-bottom:10px}
.section-sub{color:var(--muted);margin-bottom:32px;font-size:1.02rem;max-width:760px}
.breadcrumbs{font-size:.88rem;color:var(--muted);padding:14px 0 0}
.breadcrumbs a{color:var(--muted)}
.breadcrumbs a:hover{color:var(--primary)}

/* ---------- TOC ---------- */
.btn-row{margin:18px 0}
.toc{background:var(--card);border:1px solid var(--border);border-left:3px solid var(--primary);
  border-radius:var(--radius);padding:24px 28px;margin-bottom:40px}
.toc h2{font-size:1.1rem;margin-bottom:12px}
.anchor-alias{display:block;position:relative;top:-90px;visibility:hidden}
.toc-list{list-style:none;padding:0;display:grid;gap:6px}
.toc-list a{color:var(--text);font-weight:600;font-size:.96rem}
.toc-list a:hover{color:var(--primary)}
.toc-list a::before{content:"# ";color:var(--primary);font-weight:700}

/* ---------- PROSE ---------- */
.prose h2{margin:38px 0 14px;font-size:1.45rem}
.prose h3{margin:26px 0 12px;font-size:1.15rem;color:#ddd6fe}
.prose p{margin-bottom:16px}
.prose strong{color:var(--heading)}
.prose ul,.prose ol{margin:0 0 18px}
.prose li{margin-bottom:8px}

/* ---------- GRIDS & CARDS ---------- */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  padding:26px 22px;transition:transform .25s,border-color .25s}
.card:hover{transform:translateY(-4px);border-color:var(--border-2)}
.card-media{border-radius:var(--radius-sm);overflow:hidden;margin-bottom:16px;border:1px solid var(--border)}
.card-icon{font-size:1.9rem;margin-bottom:10px;line-height:1}
.card-title{font-size:1.12rem;font-weight:700;margin-bottom:8px;color:var(--heading)}
.card-desc{color:var(--muted);font-size:.95rem;margin-bottom:14px}
.card-link{font-weight:700;font-size:.93rem}

/* ---------- STEPS ---------- */
.steps{counter-reset:step;display:grid;gap:20px;grid-template-columns:repeat(4,1fr)}
.step{position:relative;background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:30px 22px 22px}
.step-num{position:absolute;top:-18px;left:22px;width:38px;height:38px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));color:var(--on-primary);
  display:flex;align-items:center;justify-content:center;font-weight:800}
.step-title{font-size:1.05rem;font-weight:700;margin:10px 0 8px;color:var(--heading)}
.step-desc{color:var(--muted);font-size:.93rem}

/* ---------- TABLES ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:var(--radius);margin:8px 0 26px}
table.data-table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:560px}
table.data-table caption{caption-side:top;text-align:left;padding:14px 18px;color:var(--muted);font-size:.9rem}
table.data-table th,table.data-table td{padding:13px 18px;text-align:left;
  border-bottom:1px solid var(--border)}
table.data-table thead th{background:var(--surface-2);color:var(--heading);font-weight:700;
  white-space:nowrap}
table.data-table tbody tr:nth-child(even){background:rgba(255,255,255,.02)}
table.data-table tbody tr:last-child td{border-bottom:none}
table.data-table td strong{color:var(--primary)}

/* ---------- FIGURES ---------- */
.figure{margin:0 0 26px;border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;background:var(--card)}
.figure figcaption{padding:12px 18px;color:var(--muted);font-size:.9rem}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:12px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);
  overflow:hidden}
.faq-q{width:100%;text-align:left;background:transparent;border:none;color:var(--heading);
  font-family:inherit;font-size:1.02rem;font-weight:700;padding:18px 22px;cursor:pointer;
  display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq-q::after{content:"+";color:var(--primary);font-size:1.4rem;font-weight:800;flex:none}
.faq-item.open .faq-q::after{content:"–"}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 22px}
.faq-item.open .faq-a{max-height:520px;padding-bottom:18px}
.faq-a p{margin:0;color:var(--muted)}

/* ---------- CTA BAND ---------- */
.cta-band{background:linear-gradient(135deg,rgba(139,92,246,.22),rgba(99,102,241,.18));
  border:1px solid var(--border-2);border-radius:var(--radius);padding:44px 34px;text-align:center}
.cta-band h2,.cta-band h3{font-size:clamp(1.4rem,3vw,1.9rem);margin-bottom:12px}
.cta-band p{color:var(--muted);max-width:720px;margin:0 auto 24px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}

/* ---------- CHIPS / BADGES ---------- */
.chips{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin-bottom:22px}
.chips li{background:rgba(139,92,246,.14);border:1px solid var(--border-2);color:#c4b5fd;
  border-radius:50px;padding:5px 16px;font-size:.85rem;font-weight:600}
.badge{display:inline-block;background:rgba(52,211,153,.15);border:1px solid rgba(52,211,153,.4);
  color:var(--good);border-radius:50px;padding:3px 14px;font-size:.82rem;font-weight:700}

/* ---------- NOTE ---------- */
.note{background:rgba(251,191,36,.08);border-left:3px solid var(--warn);border-radius:var(--radius-sm);
  padding:18px 22px;margin:0 0 26px;color:#fde68a;font-size:.95rem}

/* ---------- FOOTER ---------- */
.site-footer{background:var(--surface);border-top:1px solid var(--border);padding:52px 0 26px;
  margin-top:20px;font-size:.93rem}
.footer-cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
.footer-col h3{font-size:1rem;margin-bottom:14px;color:var(--heading)}
.footer-col ul{list-style:none;padding:0;display:grid;gap:8px}
.footer-col a{color:var(--muted)}
.footer-col a:hover{color:var(--primary)}
.footer-about{color:var(--muted);font-size:.9rem;margin-top:12px}
.footer-bottom{border-top:1px solid var(--border);padding-top:22px;color:var(--muted);
  font-size:.86rem;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between}

/* ---------- RESPONSIVE ---------- */
@media (max-width:980px){
  .hero-inner{grid-template-columns:1fr}
  .hero-art{order:-1}
  .grid-4,.steps{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr 1fr}
  .nav-toggle{display:block}
  .nav-list{display:none;position:absolute;left:0;right:0;top:100%;
    background:var(--surface);border-bottom:1px solid var(--border);padding:12px 20px;
    flex-direction:column}
  .nav-list.open{display:flex}
  .main-nav{position:relative}
  .header-inner{flex-wrap:wrap}
}
@media (max-width:640px){
  .grid-2,.grid-4,.steps{grid-template-columns:1fr}
  .section{padding:46px 0}
  .header-cta .btn{padding:9px 16px;font-size:.85rem}
  .footer-cols{grid-template-columns:1fr}
}