:root{
  --blue-900:#063b5c;
  --blue-700:#0b6fa8;
  --blue-500:#1699d6;
  --blue-100:#eaf6fc;
  --ink:#1c2b33;
  --gray:#5c6b73;
  --border:#dfe8ec;
  --white:#fff;
  --radius:10px;
  --shadow:0 6px 24px rgba(6,59,92,.08);
}
*{box-sizing:border-box;}
body{margin:0;font-family:'Segoe UI',Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.6;}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
.container{max-width:1180px;margin:0 auto;padding:0 20px;}
h1,h2,h3,h4{color:var(--blue-900);margin:0 0 12px;}
p{margin:0 0 14px;color:var(--gray);}

/* Topbar */
.topbar{background:var(--blue-900);color:#cfe9f8;font-size:13px;}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;padding:8px 0;flex-wrap:wrap;gap:6px;}
.topbar-contact a{margin-right:18px;color:#cfe9f8;}
.topbar-contact a:hover{color:#fff;}

/* Header */
.site-header{background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.06);position:sticky;top:0;z-index:50;}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;}
.site-header .container{padding-left:8px;}
.logo img{height:56px;}
.logo-text{font-size:26px;font-weight:800;color:var(--blue-700);}
.main-nav ul{list-style:none;display:flex;gap:20px;margin:0;padding:0;align-items:center;}
.main-nav li{display:flex;align-items:center;}
.main-nav a{font-weight:600;color:var(--blue-900);padding:8px 2px;white-space:nowrap;font-size:15px;}
.main-nav a.active,.main-nav a:hover{color:var(--blue-500);}

@media(min-width:701px) and (max-width:1200px){
  .main-nav{overflow-x:auto;}
  .main-nav ul{gap:14px;}
  .main-nav a{font-size:14px;}
}

.nav-toggle{display:none;background:none;border:none;font-size:26px;color:var(--blue-900);cursor:pointer;}

/* Hero */
.hero{background:linear-gradient(135deg,var(--blue-900),var(--blue-700));color:#fff;padding:70px 0;}
.hero .container{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;}
.hero h1{color:#fff;font-size:42px;margin-bottom:14px;}
.hero p{color:#dcf0fa;font-size:17px;}
.hero-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.btn{display:inline-block;background:var(--blue-500);color:#fff;padding:12px 26px;border-radius:8px;font-weight:700;border:none;cursor:pointer;}
.btn:hover{background:var(--blue-700);color:#fff;}
.btn-outline{background:transparent;border:2px solid #fff;color:#fff;}
.btn-outline:hover{background:#fff;color:var(--blue-900);}
.btn-small{padding:7px 16px;font-size:14px;}
.btn-danger{background:#c0392b;}
.btn-danger:hover{background:#96281c;}

/* Sections */
section{padding:60px 0;}
.section-title{text-align:center;max-width:680px;margin:0 auto 40px;}
.section-title h2{font-size:32px;}
.bg-light{background:var(--blue-100);}

/* Category / system cards */
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.grid-auto{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .2s;}
.card:hover{transform:translateY(-4px);}
.card-img{aspect-ratio:4/3;background:var(--blue-100) center/cover no-repeat;display:flex;align-items:center;justify-content:center;color:var(--blue-500);font-size:13px;}
.icon-softener{background-image:url('/assets/images/icon-softener.svg');color:transparent;}
.icon-sand{background-image:url('/assets/images/icon-sand.svg');color:transparent;}
.icon-carbon{background-image:url('/assets/images/icon-carbon.svg');color:transparent;}
.icon-multigrade{background-image:url('/assets/images/icon-multigrade.svg');color:transparent;}
.icon-wholehome{background-image:url('/assets/images/icon-wholehome.svg');color:transparent;}
.hero-illustration{background:url('/assets/images/hero-water.svg') center/cover no-repeat;border-radius:var(--radius);aspect-ratio:5/4;}
.card-body{padding:18px 20px;}
.card-body h3{font-size:19px;margin-bottom:8px;}
.card-body p{font-size:14px;margin-bottom:12px;}

/* Why us / features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.feature{text-align:center;padding:26px 18px;border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);}
.feature .icon{font-size:34px;margin-bottom:10px;}

/* Projects gallery */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.gallery .card-img{aspect-ratio:1/1;}

/* Page header banner */
.page-banner{background:linear-gradient(135deg,var(--blue-900),var(--blue-700));color:#fff;padding:50px 0;text-align:center;}
.page-banner h1{color:#fff;margin:0;}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;}
.contact-form input,.contact-form textarea,.contact-form select{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:8px;margin-bottom:14px;font-family:inherit;font-size:14px;}
.contact-form label{font-weight:600;font-size:14px;display:block;margin-bottom:6px;}

/* Footer */
.site-footer{background:var(--blue-900);color:#cfe9f8;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;padding:50px 0 30px;}
.site-footer h4{color:#fff;font-size:16px;}
.footer-links{list-style:none;padding:0;margin:0;}
.footer-links li{margin-bottom:8px;font-size:14px;color:#bcdcee;}
.footer-links a{color:#bcdcee;}
.footer-links a:hover{color:#fff;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.15);padding:16px 0;text-align:center;font-size:13px;color:#9cc2d7;}
.footer-bottom-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;}
.admin-login-link{color:#7fb8d6;font-size:12px;border:1px solid rgba(255,255,255,.25);padding:5px 14px;border-radius:20px;}
.admin-login-link:hover{color:#fff;border-color:#fff;}

.whatsapp-float{position:fixed;bottom:24px;right:24px;background:#25d366;color:#fff;padding:14px 20px;border-radius:50px;font-weight:700;box-shadow:0 6px 18px rgba(0,0,0,.25);z-index:60;}

/* ============ ADMIN ============ */
.admin-body{background:#f2f6f8;font-family:'Segoe UI',Arial,sans-serif;margin:0;color:var(--ink);}
.admin-wrap{display:flex;min-height:100vh;}
.admin-sidebar{width:230px;background:var(--blue-900);color:#dceefb;flex-shrink:0;}
.admin-sidebar .brand{padding:22px 20px;font-size:19px;font-weight:800;color:#fff;border-bottom:1px solid rgba(255,255,255,.12);}
.admin-sidebar nav a{display:block;padding:13px 20px;color:#cfe9f8;font-weight:500;border-left:3px solid transparent;}
.admin-sidebar nav a:hover{background:rgba(255,255,255,.06);}
.admin-sidebar nav a.active{background:rgba(255,255,255,.1);border-left-color:var(--blue-500);color:#fff;}
.admin-main{flex:1;padding:28px 34px;max-width:1100px;}
.admin-topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;}
.admin-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin-bottom:24px;}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:26px;}
.stat-card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;}
.stat-card .num{font-size:30px;font-weight:800;color:var(--blue-700);}
.stat-card .label{color:var(--gray);font-size:13px;}
.admin-table{width:100%;border-collapse:collapse;}
.admin-table th,.admin-table td{padding:12px 10px;border-bottom:1px solid var(--border);text-align:left;font-size:14px;vertical-align:middle;}
.admin-table th{color:var(--blue-900);font-size:13px;text-transform:uppercase;letter-spacing:.03em;}
.thumb{width:60px;height:60px;object-fit:cover;border-radius:6px;background:var(--blue-100);}
.form-group{margin-bottom:18px;}
.form-group label{display:block;font-weight:600;margin-bottom:6px;font-size:14px;}
.form-group input,.form-group select,.form-group textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-family:inherit;font-size:14px;}
.form-group textarea{min-height:110px;}
.alert{padding:12px 16px;border-radius:8px;margin-bottom:18px;font-size:14px;}
.alert-success{background:#e5f8ec;color:#1e7a44;border:1px solid #b6e6c9;}
.alert-error{background:#fdeceb;color:#c0392b;border:1px solid #f4c6c1;}
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--blue-900),var(--blue-700));}
.login-box{background:#fff;padding:40px 36px;border-radius:14px;width:340px;box-shadow:0 10px 40px rgba(0,0,0,.25);}
.badge{display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600;background:var(--blue-100);color:var(--blue-700);}

@media(max-width:900px){
  .hero .container{grid-template-columns:1fr;}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .features{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:repeat(2,1fr);}
  .contact-grid{grid-template-columns:1fr;}
  .stat-grid{grid-template-columns:repeat(2,1fr);}
  .admin-sidebar{position:fixed;left:-230px;top:0;bottom:0;transition:left .2s;z-index:100;}
  .admin-sidebar.open{left:0;}
}
@media(max-width:700px){
  .header-inner{position:relative;}
  .main-nav ul{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;gap:0;box-shadow:var(--shadow);padding:6px 0;z-index:90;max-height:calc(100vh - 80px);overflow-y:auto;}
  .main-nav ul.open{display:flex;}
  .main-nav li{width:100%;border-bottom:1px solid var(--border);}
  .main-nav li:last-child{border-bottom:none;}
  .main-nav a{display:block;padding:14px 20px;}
  .nav-toggle{display:block;line-height:1;padding:4px 6px;}

  .grid-4,.grid-3,.grid-2,.gallery{grid-template-columns:1fr;}
  .hero h1{font-size:30px;}
}

/* ============================================
   Homepage Slider — append to assets/css/style.css
   ============================================ */

.hero-slider { position: relative; width: 100%; overflow: hidden; }

.slider { position: relative; width: 100%; height: 60vh; min-height: 400px; }

.slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 0.8s ease-in-out;
  display: flex;
  align-items: center;
}

.slide.active { opacity: 1; }

.slide-overlay {
  width: 100%;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  padding: 40px 0;
}

.slide-overlay h1 { color: #fff; }
.slide-overlay p { color: #f0f0f0; max-width: 600px; }

.slider-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.6);
  border: none;
  font-size: 20px;
  padding: 12px 16px;
  cursor: pointer;
  z-index: 5;
  border-radius: 4px;
}

.slider-arrow.prev { left: 15px; }
.slider-arrow.next { right: 15px; }

.slider-dots {
  position: absolute;
  bottom: 18px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 5;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.6);
  cursor: pointer;
}

.dot.active { background: #fff; }

@media (max-width: 768px) {
  .slider { height: 45vh; min-height: 280px; }
}