:root{
  --primary:#0c7ea8;
  --primary-dark:#085a7a;
  --accent:#5cbdb9;
  --bg:#f4fbfd;
  --surface:#ffffff;
  --text:#0c2340;
  --muted:#5a6b7a;
  --border:#e2eef3;
  --radius:14px;
  --shadow:0 8px 24px rgba(12,126,168,0.08);
  --max:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Sarabun','Segoe UI',sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
header{position:sticky;top:0;background:rgba(255,255,255,0.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);z-index:100}
.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;max-width:var(--max);margin:0 auto}
.logo{font-size:1.6rem;font-weight:800;color:var(--primary);letter-spacing:1px;display:flex;align-items:center;gap:8px}
.logo span{font-size:1.6rem}
.nav-links{display:flex;gap:28px;list-style:none}
.nav-links a{color:var(--text);font-weight:500;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.menu-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--primary)}

/* Hero */
.hero{background:linear-gradient(135deg,#0c7ea8 0%,#5cbdb9 100%);color:#fff;padding:90px 20px;text-align:center}
.hero h1{font-size:3rem;font-weight:800;margin-bottom:18px;line-height:1.2}
.hero p{font-size:1.2rem;max-width:720px;margin:0 auto 30px;opacity:.95}
.btn{display:inline-block;background:#fff;color:var(--primary);padding:14px 32px;border-radius:50px;font-weight:700;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 14px rgba(0,0,0,.15)}
.btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.2);color:var(--primary-dark)}
.btn-outline{background:transparent;color:#fff;border:2px solid #fff;margin-left:12px}
.btn-outline:hover{background:#fff;color:var(--primary)}

/* Sections */
section{padding:70px 0}
.section-title{text-align:center;font-size:2.2rem;font-weight:700;margin-bottom:14px;color:var(--primary-dark)}
.section-sub{text-align:center;color:var(--muted);max-width:680px;margin:0 auto 50px;font-size:1.05rem}

/* 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(--surface);padding:32px;border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .25s}
.card:hover{transform:translateY(-4px)}
.card .icon{width:56px;height:56px;background:linear-gradient(135deg,var(--accent),var(--primary));border-radius:14px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.6rem;margin-bottom:18px}
.card h3{font-size:1.25rem;margin-bottom:10px;color:var(--primary-dark)}
.card p{color:var(--muted)}

/* Alt section */
.alt{background:#fff}
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;margin-bottom:60px}
.feature-row:last-child{margin-bottom:0}
.feature-row.reverse{direction:rtl}
.feature-row.reverse > *{direction:ltr}
.feature-img{height:340px;background:linear-gradient(135deg,#5cbdb9,#0c7ea8);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:#fff;font-size:5rem;box-shadow:var(--shadow)}
.feature-text h3{font-size:1.7rem;color:var(--primary-dark);margin-bottom:14px}
.feature-text p{color:var(--muted);margin-bottom:14px}
.feature-text ul{list-style:none;padding:0}
.feature-text ul li{padding:8px 0;padding-left:28px;position:relative;color:var(--text)}
.feature-text ul li:before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:bold;font-size:1.2rem}

/* Pricing */
.price-card{text-align:center;border:2px solid var(--border);transition:all .25s}
.price-card.featured{border-color:var(--primary);transform:scale(1.03)}
.price-card .size{font-size:1.4rem;font-weight:700;color:var(--primary)}
.price-card .price{font-size:2.4rem;font-weight:800;color:var(--primary-dark);margin:14px 0}
.price-card .price small{font-size:1rem;color:var(--muted);font-weight:400}
.price-card ul{list-style:none;text-align:left;margin:20px 0}
.price-card ul li{padding:6px 0 6px 24px;position:relative;color:var(--muted)}
.price-card ul li:before{content:"💧";position:absolute;left:0}

/* CTA */
.cta{background:linear-gradient(135deg,var(--primary-dark),var(--primary));color:#fff;text-align:center;padding:70px 20px;border-radius:var(--radius);margin:60px auto;max-width:var(--max)}
.cta h2{font-size:2rem;margin-bottom:14px}
.cta p{margin-bottom:24px;opacity:.95}

/* Footer */
footer{background:#0c2340;color:#cbd6e0;padding:50px 20px 20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;max-width:var(--max);margin:0 auto 30px}
.footer-grid h4{color:#fff;margin-bottom:14px;font-size:1.1rem}
.footer-grid ul{list-style:none}
.footer-grid ul li{padding:4px 0}
.footer-grid a{color:#cbd6e0}
.footer-grid a:hover{color:var(--accent)}
.footer-bottom{text-align:center;border-top:1px solid #1e3a5f;padding-top:20px;color:#8a9bab;font-size:.9rem;max-width:var(--max);margin:0 auto}

/* Page header */
.page-header{background:linear-gradient(135deg,var(--primary-dark),var(--accent));color:#fff;padding:80px 20px;text-align:center}
.page-header h1{font-size:2.6rem;margin-bottom:10px}
.page-header p{opacity:.95;font-size:1.1rem}

/* Content */
.content{max-width:880px;margin:0 auto;padding:0 20px}
.content h2{color:var(--primary-dark);margin:30px 0 12px;font-size:1.6rem;border-left:4px solid var(--accent);padding-left:14px}
.content h3{color:var(--primary);margin:22px 0 10px;font-size:1.2rem}
.content p,.content li{color:var(--text);margin-bottom:12px}
.content ul,.content ol{padding-left:24px;margin-bottom:14px}
.content ul li,.content ol li{margin-bottom:8px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;max-width:var(--max);margin:0 auto;padding:0 20px}
.contact-info .info-item{display:flex;gap:16px;margin-bottom:24px;align-items:flex-start}
.contact-info .info-item .ic{width:48px;height:48px;background:linear-gradient(135deg,var(--accent),var(--primary));border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.3rem;flex-shrink:0}
.contact-info .info-item h4{color:var(--primary-dark);margin-bottom:4px}
.contact-info .info-item p{color:var(--muted);margin:0}
.form{background:#fff;padding:32px;border-radius:var(--radius);box-shadow:var(--shadow)}
.form-group{margin-bottom:18px}
.form-group label{display:block;margin-bottom:6px;font-weight:500;color:var(--text)}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:1rem;transition:border .2s}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:var(--primary)}
.form-group textarea{resize:vertical;min-height:120px}
.form button{background:var(--primary);color:#fff;border:none;padding:14px 32px;border-radius:50px;font-weight:700;cursor:pointer;width:100%;font-size:1rem;transition:background .2s}
.form button:hover{background:var(--primary-dark)}

/* FAQ */
.faq-item{background:#fff;border-radius:var(--radius);padding:22px 26px;margin-bottom:14px;box-shadow:var(--shadow)}
.faq-item h4{color:var(--primary-dark);margin-bottom:8px;font-size:1.1rem}
.faq-item p{color:var(--muted);margin:0}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;margin:40px 0}
.stat-num{font-size:2.4rem;font-weight:800;color:var(--primary);display:block}
.stat-label{color:var(--muted)}

@media(max-width:860px){
  .grid-3,.grid-4,.grid-2{grid-template-columns:1fr}
  .feature-row,.contact-grid,.footer-grid{grid-template-columns:1fr;gap:30px}
  .feature-row.reverse{direction:ltr}
  .hero h1{font-size:2.1rem}
  .hero p{font-size:1rem}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:20px;gap:14px;border-bottom:1px solid var(--border)}
  .nav-links.open{display:flex}
  .menu-toggle{display:block}
  .stats{grid-template-columns:repeat(2,1fr)}
  .btn-outline{margin-left:0;margin-top:10px}
  .price-card.featured{transform:none}
}