/* Maili Inverter Thai Site - Premium Responsive */
:root{--primary:#0b3d91;--accent:#e63946;--dark:#1a1a2e;--light:#f8f9fa;--gray:#6c757d;--radius:8px;--shadow:0 4px 20px rgba(0,0,0,.08);--transition:.3s ease}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Sarabun','Noto Sans Thai',sans-serif;color:#333;line-height:1.7;background:#fff}
img{max-width:100%;height:auto;display:block;border-radius:var(--radius)}
a{text-decoration:none;color:var(--primary);transition:var(--transition)}
a:hover{color:var(--accent)}
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
.section{padding:4rem 0}
.section-title{text-align:center;font-size:2rem;margin-bottom:2.5rem;color:var(--dark);position:relative}
.section-title::after{content:'';display:block;width:60px;height:3px;background:var(--accent);margin:10px auto 0;border-radius:2px}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem}

/* Header */
.site-header{background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.06);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo img{height:45px;width:auto}
.main-nav{display:flex;align-items:center;gap:1.5rem}
.main-nav a{font-weight:500;color:var(--dark);font-size:.95rem}
.main-nav a:hover,.main-nav a.active{color:var(--primary)}
.cta-btn{background:var(--accent)!important;color:#fff!important;padding:.5rem 1.2rem;border-radius:var(--radius);font-weight:600!important}
.cta-btn:hover{background:#c1121f!important}
.menu-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer}

/* Hero */
.hero{background-size:cover;background-position:center;min-height:500px;display:flex;align-items:center;position:relative}
.hero::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(11,61,145,.85),rgba(26,26,46,.7))}
.hero-content{position:relative;color:#fff;text-align:center;padding:3rem 0}
.hero h1{font-size:2.5rem;margin-bottom:1rem;line-height:1.3}
.hero p{font-size:1.15rem;max-width:700px;margin:0 auto 2rem;opacity:.95}

/* Buttons */
.btn{display:inline-block;padding:.75rem 2rem;border-radius:var(--radius);font-weight:600;font-size:1rem;transition:var(--transition);border:2px solid transparent;cursor:pointer;text-align:center}
.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn-primary:hover{background:#c1121f;border-color:#c1121f;color:#fff}
.btn-outline{border-color:#fff;color:#fff}
.btn-outline:hover{background:#fff;color:var(--primary)}
.btn-sm{padding:.4rem 1.2rem;font-size:.85rem}
.btn-lg{padding:1rem 2.5rem;font-size:1.1rem}
.btn-block{width:100%;display:block}

/* Cards */
.card{background:#fff;padding:2rem;border-radius:var(--radius);box-shadow:var(--shadow);text-align:center;transition:var(--transition)}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.card h3{font-size:1.3rem;margin-bottom:.8rem;color:var(--dark)}

/* Product Grid */
.product-grid .product-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:var(--transition);display:flex;flex-direction:column}
.product-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.12)}
.product-card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.product-card h3{padding:1rem 1.2rem .5rem;font-size:1.1rem;color:var(--dark)}
.product-card p{padding:0 1.2rem;font-size:.9rem;color:var(--gray);flex:1}
.product-card .btn{margin:1rem 1.2rem 1.2rem;align-self:flex-start}

/* Page Banner */
.page-banner{background:linear-gradient(135deg,var(--primary),var(--dark));color:#fff;padding:4rem 0;text-align:center}
.page-banner h1{font-size:2.2rem}

/* About */
.about-layout{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.about-text h2{font-size:1.8rem;margin-bottom:1rem;color:var(--dark)}
.about-text h3{font-size:1.3rem;margin:1.5rem 0 .8rem;color:var(--primary)}
.about-text ul{padding-left:1.2rem}
.about-text li{margin-bottom:.4rem}
.about-gallery{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.about-gallery img{border-radius:var(--radius);aspect-ratio:4/3;object-fit:cover}

/* Certs */
.cert-grid div{text-align:center}
.cert-grid img{margin:0 auto 1rem;max-height:300px;border-radius:var(--radius);box-shadow:var(--shadow)}
.cert-grid p{font-weight:600;color:var(--dark)}

/* Product Detail */
.product-detail{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.product-detail-img img{border-radius:var(--radius);box-shadow:var(--shadow)}
.product-detail-info .lead{font-size:1.1rem;color:var(--gray);margin-bottom:1.5rem;line-height:1.8}
.product-detail-info h3{font-size:1.4rem;margin:1.5rem 0 .8rem;color:var(--dark)}
.product-detail-info ul{padding-left:1.2rem}
.product-detail-info li{margin-bottom:.5rem}
.product-cta{margin-top:2rem;display:flex;gap:1rem;flex-wrap:wrap}

/* Spec Table */
.spec-table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.9rem}
.spec-table th,.spec-table td{border:1px solid #dee2e6;padding:.6rem .8rem;text-align:left}
.spec-table thead{background:var(--primary);color:#fff}
.spec-table tbody tr:nth-child(even){background:#f8f9fa}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid #dee2e6;border-radius:var(--radius);margin-bottom:1rem;overflow:hidden}
.faq-item summary{padding:1.2rem 1.5rem;font-weight:600;cursor:pointer;background:#fff;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:1.3rem;color:var(--accent);font-weight:700}
.faq-item[open] summary::after{content:'−'}
.faq-item[open] summary{background:var(--light);border-bottom:1px solid #dee2e6}
.faq-answer{padding:1.2rem 1.5rem;background:#fff;line-height:1.8}

/* Contact */
.contact-layout{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.contact-info h2{font-size:1.8rem;margin-bottom:1rem;color:var(--dark)}
.info-block{margin-top:1.5rem}
.info-block h4{color:var(--primary);margin-bottom:.3rem}
.contact-form{background:#fff;padding:2rem;border-radius:var(--radius);box-shadow:var(--shadow)}
.form-group{margin-bottom:1.2rem}
.form-group label{display:block;font-weight:600;margin-bottom:.4rem;color:var(--dark)}
.form-group input,.form-group textarea{width:100%;padding:.7rem 1rem;border:1px solid #dee2e6;border-radius:var(--radius);font-size:1rem;font-family:inherit;transition:var(--transition)}
.form-group input:focus,.form-group textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(11,61,145,.1)}
.form-status{margin-top:1rem;padding:.8rem;border-radius:var(--radius);text-align:center;font-weight:600;display:none}
.form-status.success{display:block;background:#d4edda;color:#155724}
.form-status.error{display:block;background:#f8d7da;color:#721c24}

/* CTA Section */
.cta-section{background:linear-gradient(135deg,var(--primary),var(--dark));color:#fff}
.cta-section h2{color:#fff;margin-bottom:.8rem}
.cta-section p{opacity:.9;margin-bottom:1.5rem}
.cta-section .btn-primary{background:#fff;color:var(--primary);border-color:#fff}
.cta-section .btn-primary:hover{background:var(--light);color:var(--primary)}

/* Footer */
.site-footer{background:var(--dark);color:#ccc;padding:3rem 0 1rem}
.footer-inner{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:2rem;margin-bottom:2rem}
.footer-col h4{color:#fff;margin-bottom:1rem;font-size:1.1rem}
.footer-col a{display:block;color:#aaa;margin-bottom:.4rem;font-size:.9rem}
.footer-col a:hover{color:#fff}
.copyright{text-align:center;padding-top:1.5rem;border-top:1px solid rgba(255,255,255,.1);font-size:.85rem}


.section-alt{background:var(--light)}
.icon-badge{width:58px;height:58px;border-radius:50%;background:rgba(11,61,145,.08);color:var(--primary);display:flex;align-items:center;justify-content:center;margin:0 auto 1rem}
.icon-badge svg{width:28px;height:28px}
.card .icon-badge{background:rgba(230,57,70,.08);color:var(--accent)}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--dark);border-radius:2px;transition:var(--transition)}
.product-desc{max-width:900px;margin:0 auto;padding:0 1.5rem}
.product-desc h2{font-size:1.7rem;color:var(--dark);margin-bottom:1.4rem;text-align:center}
.product-desc p{margin-bottom:1.15rem;font-size:1.02rem;color:#414855;line-height:1.95;text-align:justify}

/* Responsive */
@media(max-width:768px){
.menu-toggle{display:block}
.main-nav{display:none;position:absolute;top:70px;left:0;right:0;background:#fff;flex-direction:column;padding:1rem;box-shadow:0 4px 10px rgba(0,0,0,.1)}
.main-nav.open{display:flex}
.hero h1{font-size:1.8rem}
.about-layout,.product-detail,.contact-layout{grid-template-columns:1fr}
.about-gallery{grid-template-columns:1fr 1fr}
.grid-3{grid-template-columns:1fr}
}
@media(max-width:480px){
.hero{min-height:400px}
.hero h1{font-size:1.5rem}
.section{padding:2.5rem 0}
.about-gallery{grid-template-columns:1fr}
}