:root{
  --bg:#f4fbfd; --surface:#ffffff; --ink:#0c2340; --muted:#5a6b80;
  --primary:#0d7a9e; --primary-2:#5cbdb9; --accent:#f4a259; --line:#e2eaf0;
  --shadow: 0 10px 30px -12px rgba(12,35,64,.18);
  --radius: 14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Sarabun','Segoe UI',system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;height:auto}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--ink)}
.container{max-width:1180px;margin:0 auto;padding:0 22px}

/* Header */
.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;color:var(--ink)}
.brand .logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--primary),var(--primary-2));display:grid;place-items:center;color:#fff;font-weight:900}
.menu{display:flex;gap:6px;list-style:none;flex-wrap:wrap}
.menu a{display:inline-block;padding:9px 14px;border-radius:8px;color:var(--ink);font-weight:600;font-size:.95rem}
.menu a:hover,.menu a.active{background:var(--primary);color:#fff}
.cta{background:var(--accent);color:#fff !important;padding:10px 18px;border-radius:8px;font-weight:700}
.cta:hover{filter:brightness(.95);color:#fff !important}

/* Hero */
.hero{position:relative;color:#fff;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(12,35,64,.85),rgba(13,122,158,.55));z-index:1}
.hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-inner{position:relative;z-index:2;padding:90px 0 110px;max-width:760px}
.hero h1{font-size:clamp(2rem,4.5vw,3.4rem);line-height:1.2;margin-bottom:18px;font-weight:800}
.hero p{font-size:1.1rem;opacity:.95;margin-bottom:28px}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:13px 26px;border-radius:10px;font-weight:700;border:none;cursor:pointer;transition:transform .15s}
.btn:hover{transform:translateY(-2px);color:#fff}
.btn.outline{background:transparent;border:2px solid #fff;margin-left:10px}

/* Sections */
section{padding:70px 0}
.section-title{text-align:center;margin-bottom:14px;font-size:2rem;font-weight:800;color:var(--ink)}
.section-sub{text-align:center;color:var(--muted);max-width:680px;margin:0 auto 50px}

/* Grid cards */
.grid{display:grid;gap:24px}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid.cols-4{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-5px);box-shadow:0 20px 40px -15px rgba(12,35,64,.25)}
.card .img{aspect-ratio:4/3;overflow:hidden;background:#eef5f8}
.card .img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.card:hover .img img{transform:scale(1.05)}
.card .body{padding:20px}
.card h3{font-size:1.15rem;margin-bottom:8px;color:var(--ink)}
.card p{color:var(--muted);font-size:.95rem;margin-bottom:12px}
.price{color:var(--primary);font-weight:800;font-size:1.1rem}
.tag{display:inline-block;background:#eaf6f9;color:var(--primary);padding:3px 10px;border-radius:20px;font-size:.78rem;font-weight:700;margin-bottom:8px}

/* Service block */
.service-grid{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.service{background:#fff;border-radius:var(--radius);padding:28px;border:1px solid var(--line);box-shadow:var(--shadow)}
.service .icon{width:54px;height:54px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--primary-2));display:grid;place-items:center;color:#fff;font-size:1.6rem;margin-bottom:16px}
.service h3{margin-bottom:8px;font-size:1.15rem}
.service p{color:var(--muted);font-size:.95rem}

/* Features bar */
.features{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.features .row{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));text-align:center}
.feat h4{color:var(--primary);font-size:1.6rem}
.feat span{color:var(--muted);font-size:.92rem}

/* CTA band */
.cta-band{background:linear-gradient(120deg,var(--primary),var(--primary-2));color:#fff;text-align:center;padding:60px 20px;border-radius:var(--radius);margin:60px 0}
.cta-band h2{font-size:1.8rem;margin-bottom:10px}
.cta-band p{opacity:.92;margin-bottom:22px}

/* Portfolio */
.work-grid{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.work{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:4/3}
.work img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.work:hover img{transform:scale(1.08)}
.work .overlay{position:absolute;inset:0;background:linear-gradient(to top,rgba(12,35,64,.85),transparent 60%);display:flex;align-items:flex-end;padding:22px;color:#fff}
.work .overlay h3{font-size:1.2rem;margin-bottom:4px}
.work .overlay span{opacity:.85;font-size:.9rem}

/* Contact */
.contact-grid{display:grid;gap:36px;grid-template-columns:1fr 1fr}
@media(max-width:780px){.contact-grid{grid-template-columns:1fr}}
.info-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.info-card h3{margin-bottom:14px;color:var(--ink)}
.info-row{display:flex;align-items:flex-start;gap:14px;margin-bottom:14px}
.info-row .ico{width:40px;height:40px;border-radius:10px;background:#eaf6f9;color:var(--primary);display:grid;place-items:center;font-size:1.1rem;flex-shrink:0}
.info-row strong{display:block;color:var(--ink)}
.info-row span{color:var(--muted);font-size:.95rem}
form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
form label{display:block;font-weight:600;margin-bottom:6px;font-size:.92rem}
form input,form textarea,form select{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:8px;font:inherit;margin-bottom:14px;background:#fafdfe}
form input:focus,form textarea:focus,form select:focus{outline:2px solid var(--primary);border-color:var(--primary)}
form textarea{resize:vertical;min-height:120px}

/* About / content blocks */
.split{display:grid;gap:40px;grid-template-columns:1fr 1fr;align-items:center}
@media(max-width:780px){.split{grid-template-columns:1fr}}
.split img{border-radius:var(--radius);box-shadow:var(--shadow)}
.split h2{font-size:1.8rem;margin-bottom:14px}
.split p{color:var(--muted);margin-bottom:12px}
.bullet{list-style:none;padding:0}
.bullet li{padding-left:28px;position:relative;margin-bottom:8px;color:var(--muted)}
.bullet li::before{content:"✓";position:absolute;left:0;top:0;color:var(--primary);font-weight:900}

/* Footer */
footer{background:var(--ink);color:#cfd8e3;padding:50px 0 24px;margin-top:60px}
.foot-grid{display:grid;gap:30px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-bottom:30px}
footer h4{color:#fff;margin-bottom:14px}
footer a{color:#cfd8e3;display:block;padding:4px 0;font-size:.93rem}
footer a:hover{color:var(--primary-2)}
.copy{text-align:center;border-top:1px solid rgba(255,255,255,.08);padding-top:20px;font-size:.88rem;color:#8b9bb0}

/* mobile nav */
.menu-toggle{display:none;background:none;border:none;font-size:1.6rem;cursor:pointer;color:var(--ink)}
@media(max-width:760px){
  .menu-toggle{display:block}
  .menu{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:14px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .menu.open{display:flex}
  .nav{position:relative}
}