:root{
  --primary:#0b3d91;
  --primary-dark:#082a63;
  --accent:#e63946;
  --bg:#f7f9fc;
  --text:#1c2434;
  --muted:#5b6577;
  --card:#ffffff;
  --border:#e4e8ef;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Sarabun","Prompt","Segoe UI",sans-serif;color:var(--text);background:var(--bg);line-height:1.75;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:1200px;margin:0 auto}
.logo{font-weight:800;font-size:22px;color:var(--primary);display:flex;align-items:center;gap:10px}
.logo span{background:var(--primary);color:#fff;padding:6px 10px;border-radius:6px;font-size:14px}
.nav ul{display:flex;gap:24px;list-style:none;flex-wrap:wrap}
.nav ul a{color:var(--text);font-weight:500;font-size:15px}
.nav ul a:hover{color:var(--primary);text-decoration:none}
.menu-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer}

/* Hero */
.hero{position:relative;min-height:520px;display:flex;align-items:center;color:#fff;background:linear-gradient(rgba(8,42,99,.75),rgba(11,61,145,.75)),url('https://images.unsplash.com/photo-1565043666747-69f6646db940?auto=format&fit=crop&w=1600&q=80') center/cover no-repeat}
.hero-inner{max-width:1200px;margin:0 auto;padding:80px 20px}
.hero h1{font-size:44px;font-weight:800;margin-bottom:20px;line-height:1.2;max-width:820px}
.hero p{font-size:19px;max-width:760px;margin-bottom:28px;opacity:.95}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:14px 30px;border-radius:8px;font-weight:600;transition:transform .2s,background .2s}
.btn:hover{background:#c22c38;text-decoration:none;transform:translateY(-2px)}
.btn-outline{background:transparent;border:2px solid #fff;margin-left:10px}
.btn-outline:hover{background:#fff;color:var(--primary)}

/* Sections */
section{padding:70px 0}
.section-title{text-align:center;margin-bottom:50px}
.section-title h2{font-size:34px;color:var(--primary);margin-bottom:12px;font-weight:700}
.section-title p{color:var(--muted);font-size:17px;max-width:700px;margin:0 auto}

/* Grids */
.grid{display:grid;gap:28px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{background:var(--card);border-radius:12px;overflow:hidden;box-shadow:0 2px 14px rgba(0,0,0,.06);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.1)}
.card img{height:220px;object-fit:cover;width:100%}
.card-body{padding:22px}
.card h3{font-size:19px;color:var(--primary);margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}

.feature{background:#fff;padding:30px;border-radius:12px;border:1px solid var(--border);text-align:center}
.feature .icon{width:66px;height:66px;background:linear-gradient(135deg,var(--primary),#3763c9);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:28px;margin:0 auto 18px}
.feature h3{color:var(--primary);margin-bottom:10px;font-size:19px}
.feature p{color:var(--muted);font-size:15px}

/* Content article */
article.content{background:#fff;padding:40px;border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,.05)}
article.content h2{color:var(--primary);font-size:28px;margin:32px 0 14px;border-left:5px solid var(--accent);padding-left:14px}
article.content h3{color:var(--primary-dark);font-size:22px;margin:24px 0 12px}
article.content p{margin-bottom:16px;color:#2b3244;text-indent:2em}
article.content ul,article.content ol{margin:14px 0 20px 40px;color:#2b3244}
article.content li{margin-bottom:8px}
article.content img{border-radius:10px;margin:24px 0}
article.content blockquote{border-left:4px solid var(--primary);background:#f0f4fb;padding:16px 22px;margin:20px 0;font-style:italic;color:#33405b;border-radius:6px}

/* Page hero smaller */
.page-hero{background:linear-gradient(rgba(8,42,99,.85),rgba(11,61,145,.85)),url('https://images.unsplash.com/photo-1504917595217-d4dc5ebe6122?auto=format&fit=crop&w=1600&q=80') center/cover;color:#fff;padding:80px 20px;text-align:center}
.page-hero h1{font-size:40px;margin-bottom:10px}
.page-hero p{opacity:.9;font-size:17px}

/* Contact */
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:40px}
.info-box{background:#fff;padding:28px;border-radius:12px;border-top:4px solid var(--primary);text-align:center}
.info-box h3{color:var(--primary);margin-bottom:10px}
.info-box p{color:var(--muted)}
.contact-form{background:#fff;padding:36px;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.form-group{margin-bottom:18px}
.form-group label{display:block;margin-bottom:6px;font-weight:600;color:var(--text)}
.form-group input,.form-group textarea{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:15px}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--primary)}

/* Footer */
footer{background:#0a1a3a;color:#c8d0e0;padding:50px 0 20px;margin-top:60px}
footer .container{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}
footer h4{color:#fff;margin-bottom:16px;font-size:18px}
footer ul{list-style:none}
footer ul li{margin-bottom:8px}
footer a{color:#c8d0e0}
footer a:hover{color:#fff}
.copyright{border-top:1px solid #1e2c50;margin-top:34px;padding-top:20px;text-align:center;color:#8994b0;font-size:14px;max-width:1200px;margin-left:auto;margin-right:auto}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.gallery img{height:200px;object-fit:cover;border-radius:8px;cursor:pointer;transition:transform .3s}
.gallery img:hover{transform:scale(1.03)}

@media(max-width:900px){
  .grid-3,.grid-4,.info-grid,footer .container,.gallery{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:32px}
  .hero p{font-size:16px}
  .nav ul{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;box-shadow:0 4px 10px rgba(0,0,0,.1)}
  .nav ul.open{display:flex}
  .menu-toggle{display:block}
  article.content{padding:24px}
}
@media(max-width:600px){
  .grid-3,.grid-4,.grid-2,.info-grid,footer .container,.gallery{grid-template-columns:1fr}
  .hero h1{font-size:26px}
  .section-title h2{font-size:26px}
}