:root{
  --bg:#0b1220; --bg2:#f4f6fb; --card:#ffffff; --ink:#16213a;
  --muted:#64748b; --brand:#16a34a; --brand2:#0ea5e9; --hl:#facc15;
  --radius:16px; --shadow:0 10px 30px rgba(2,6,23,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Tahoma,"Noto Sans Thai",sans-serif;color:var(--ink);background:var(--bg2);line-height:1.7}
.container{width:min(1120px,92%);margin:0 auto}
h1{font-size:clamp(1.9rem,4.5vw,3rem);line-height:1.25;margin:.4em 0}
h2{font-size:clamp(1.3rem,3vw,1.8rem);margin:0 0 .3em}
.muted{color:var(--muted)}
.hl{background:linear-gradient(180deg,transparent 60%,var(--hl) 60%);padding:0 .15em}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(11,18,32,.92);backdrop-filter:blur(8px);color:#fff}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:.8rem 0}
.brand{color:#fff;text-decoration:none;font-weight:800;font-size:1.25rem}
.brand span{color:var(--hl)}
.main-nav{display:flex;gap:1.1rem}
.main-nav a{color:#e2e8f0;text-decoration:none;font-weight:600}
.main-nav a:hover{color:var(--hl)}
.nav-toggle{display:none;background:none;border:1px solid #334155;color:#fff;border-radius:10px;padding:.35rem .7rem;font-size:1.2rem;cursor:pointer}

/* hero */
.hero{background:radial-gradient(1000px 400px at 20% 0%,#1e3a8a,transparent),linear-gradient(180deg,#0b1220,#111c33);color:#fff;padding:3rem 0}
.hero-grid{display:grid;grid-template-columns:1.3fr .9fr;gap:2rem;align-items:center}
.badge{display:inline-block;background:#1e293b;border:1px solid #334155;padding:.25rem .8rem;border-radius:999px;font-size:.85rem;color:#e2e8f0}
.lead{color:#cbd5e1;font-size:1.05rem}
.hero-actions{display:flex;gap:.8rem;flex-wrap:wrap;margin:1.2rem 0}
.btn{border:0;border-radius:999px;padding:.7rem 1.4rem;font-weight:700;cursor:pointer;text-decoration:none;display:inline-block;font-size:1rem}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:#15803d}
.btn-ghost{background:transparent;color:#fff;border:2px solid #475569}
.btn-ghost:hover{border-color:var(--hl);color:var(--hl)}
.btn-block{width:100%;margin-top:.6rem}
.hero-card{background:#fff;color:var(--ink);border-radius:var(--radius);padding:1.3rem;box-shadow:var(--shadow)}
.hero-stats{display:flex;gap:2rem;margin-top:1rem}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats strong{font-size:1.6rem;color:var(--hl)}
.hero-stats span{color:#cbd5e1;font-size:.9rem}

/* sections/cards */
.section{padding:3rem 0}
.section-alt{background:#fff}
.grid{display:grid;gap:1.2rem;margin-top:1.2rem}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-auto{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.card{background:var(--card);border:1px solid #e2e8f0;border-radius:var(--radius);padding:1.3rem;box-shadow:var(--shadow)}
.section-alt .card{background:var(--bg2)}
.tool{background:#fff !important}
.branch ul{margin:.5em 0 0 1.1em;padding:0}
.branch li{margin:.35em 0}

label{display:block;margin:.6em 0;font-weight:600;font-size:.95rem}
input,select{width:100%;margin-top:.3rem;padding:.65rem .8rem;border:1.5px solid #cbd5e1;border-radius:10px;font-size:1rem;background:#fff}
input:focus,select:focus{outline:2px solid var(--brand2);border-color:var(--brand2)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 .9rem}
.result{background:#f0fdf4;border:1px dashed #16a34a;border-radius:12px;padding:.8rem;margin-top:.8rem;min-height:3em}
.result-mini{background:#f0fdf4;border-radius:10px;padding:.6rem;margin:.7rem 0 0}
table{width:100%;border-collapse:collapse;margin-top:.6rem;font-size:.95rem}
th,td{text-align:left;padding:.5rem;border-bottom:1px solid #e2e8f0}
th{background:#f1f5f9}
.newsletter{margin-top:1.2rem}
.newsletter-row{display:flex;gap:.6rem}
.newsletter-row input{flex:1}
.refs{margin-top:1rem;font-size:.9rem}
.history-row{margin-top:1rem;display:flex;gap:1rem;align-items:center;flex-wrap:wrap}
.history-row .btn-ghost{color:var(--ink);border-color:#94a3b8}

/* footer */
.site-footer{background:var(--bg);color:#e2e8f0;padding:1.2rem 0}
.footer-inner{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.9rem}

/* ===== Responsive: รองรับทุกอุปกรณ์ ===== */
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .grid-3{grid-template-columns:1fr 1fr}
  .grid-2{grid-template-columns:1fr}
}
@media (max-width:640px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:#0b1220;flex-direction:column;padding:1rem 4%;gap:.2rem;border-top:1px solid #1e293b}
  .main-nav.open{display:flex}
  .main-nav a{padding:.7rem .3rem;border-bottom:1px solid #1e293b}
  .grid-3{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .newsletter-row{flex-direction:column}
  .section{padding:2rem 0}
  .hero{padding:2rem 0}
}