/* ============================================================
   HUY HOÀNG SMART TECH – Điện mặt trời mái nhà
   Style chung – phong cách tham khảo dienmayxanh.com
   ============================================================ */
:root{
  --navy:#0a2a5e;
  --navy-2:#123a7a;
  --blue:#1577d1;
  --blue-light:#2a95e6;
  --cyan:#16b5d0;
  --gold:#f7a800;
  --gold-2:#ff8f00;
  --green:#1faa59;
  --ink:#1c2733;
  --muted:#5b6b7b;
  --line:#e4e9ef;
  --bg:#f4f6f9;
  --white:#fff;
  --radius:12px;
  --shadow:0 6px 22px rgba(16,42,84,.10);
  --shadow-sm:0 2px 10px rgba(16,42,84,.08);
  --container:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:'Segoe UI',Roboto,'Helvetica Neue',Arial,'Noto Sans',sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--container);margin:0 auto;padding:0 16px}
.section{padding:56px 0}
.section-alt{background:var(--white)}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;color:var(--navy)}
.btn{
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;border:0;
  padding:12px 26px;border-radius:30px;font-weight:700;font-size:15px;
  transition:.2s;text-align:center;
}
.btn-gold{background:linear-gradient(90deg,var(--gold),var(--gold-2));color:#3a2600}
.btn-gold:hover{filter:brightness(1.06);transform:translateY(-2px)}
.btn-blue{background:linear-gradient(90deg,var(--blue),var(--cyan));color:#fff}
.btn-blue:hover{filter:brightness(1.06);transform:translateY(-2px)}
.btn-ghost{background:#fff;color:var(--blue);border:2px solid var(--blue)}
.btn-ghost:hover{background:var(--blue);color:#fff}

/* ---------- Section heading ---------- */
.sec-head{text-align:center;max-width:760px;margin:0 auto 38px}
.sec-head .kicker{color:var(--gold-2);font-weight:800;letter-spacing:2px;text-transform:uppercase;font-size:13px}
.sec-head h2{font-size:30px;margin:.3em 0 .35em}
.sec-head p{color:var(--muted);margin:0}
.sec-head .bar{width:64px;height:4px;border-radius:4px;background:linear-gradient(90deg,var(--gold),var(--gold-2));margin:14px auto 0}

/* ============================================================ TOP BAR */
.topbar{background:var(--navy);color:#cfe0f5;font-size:13.5px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar a{color:#cfe0f5}
.topbar a:hover{color:#fff}
.topbar .tb-left span{margin-right:18px;display:inline-flex;align-items:center;gap:6px}
.topbar .tb-right a{margin-left:16px;display:inline-flex;align-items:center;gap:6px}

/* ============================================================ HEADER */
.header{background:linear-gradient(100deg,var(--blue) 0%,var(--navy) 100%);color:#fff}
.header .container{display:flex;align-items:center;gap:22px;padding-top:12px;padding-bottom:12px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand img{height:56px;width:auto;background:#fff;border-radius:10px;padding:5px}
.brand .bt{line-height:1.1}
.brand .bt b{display:block;font-size:20px;letter-spacing:.5px}
.brand .bt small{font-size:12px;color:#bfe0ff;letter-spacing:2px}
.search{flex:1;max-width:520px}
.search form{display:flex;background:#fff;border-radius:30px;overflow:hidden;box-shadow:var(--shadow-sm)}
.search input{flex:1;border:0;padding:12px 18px;font-size:14.5px;outline:none;color:var(--ink)}
.search button{border:0;background:var(--gold);color:#3a2600;padding:0 20px;font-weight:800;cursor:pointer}
.header-hotline{display:flex;align-items:center;gap:10px;margin-left:auto}
.header-hotline .ic{width:42px;height:42px;border-radius:50%;background:rgba(255,255,255,.16);display:flex;align-items:center;justify-content:center;font-size:20px}
.header-hotline .ht small{display:block;font-size:12px;color:#cfe6ff}
.header-hotline .ht b{font-size:19px;color:#fff}

/* ============================================================ NAV */
.nav{background:var(--navy);position:sticky;top:0;z-index:50;box-shadow:0 2px 12px rgba(0,0,0,.18)}
.nav .container{display:flex;align-items:center}
.nav ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap}
.nav li a{display:block;color:#eaf2ff;font-weight:600;padding:14px 20px;font-size:15px;position:relative;transition:.15s}
.nav li a:hover{background:rgba(255,255,255,.08)}
.nav li a.active{background:linear-gradient(90deg,var(--gold),var(--gold-2));color:#3a2600}
.nav-toggle{display:none;background:none;border:0;color:#fff;font-size:26px;padding:10px 14px;cursor:pointer;margin-left:auto}

/* ============================================================ HERO */
.hero{position:relative;color:#fff;overflow:hidden}
.hero-slide{position:relative;min-height:480px;display:flex;align-items:center;
  background-size:cover;background-position:center}
.hero-slide::before{content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(10,42,94,.86) 0%,rgba(10,42,94,.55) 55%,rgba(10,42,94,.2) 100%)}
.hero-inner{position:relative;max-width:640px}
.hero .kicker{display:inline-block;background:var(--gold);color:#3a2600;font-weight:800;
  padding:6px 16px;border-radius:20px;font-size:13px;letter-spacing:1px;text-transform:uppercase}
.hero h1{color:#fff;font-size:42px;margin:16px 0 14px;text-shadow:0 2px 12px rgba(0,0,0,.3)}
.hero p{font-size:18px;color:#e7f0ff;margin:0 0 26px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}

/* ============================================================ STATS */
.stats{background:linear-gradient(100deg,var(--blue),var(--navy));color:#fff}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:34px 16px}
.stat{text-align:center}
.stat b{display:block;font-size:34px;color:var(--gold);font-weight:800}
.stat span{font-size:14.5px;color:#dce9fb}

/* ============================================================ FEATURE CARDS */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);
  overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.card .thumb{aspect-ratio:4/3;overflow:hidden;background:#dde5ee}
.card .thumb img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .thumb img{transform:scale(1.06)}
.card .body{padding:18px 18px 22px}
.card .body h3{font-size:18px;margin-bottom:8px}
.card .body p{color:var(--muted);font-size:14.5px;margin:0 0 14px}
.card .more{color:var(--blue);font-weight:700;font-size:14px}

/* Icon feature */
.feature{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center;box-shadow:var(--shadow-sm);transition:.2s}
.feature:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.feature .ico{width:64px;height:64px;margin:0 auto 14px;border-radius:16px;
  background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;display:flex;align-items:center;justify-content:center;font-size:30px}
.feature h3{font-size:17.5px;margin-bottom:8px}
.feature p{color:var(--muted);font-size:14.5px;margin:0}

/* Solution card (pricing style) */
.solution{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;transition:.2s}
.solution:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.solution .top{padding:20px;color:#fff;text-align:center;background:linear-gradient(120deg,var(--blue),var(--navy))}
.solution.hl .top{background:linear-gradient(120deg,var(--gold),var(--gold-2));color:#3a2600}
.solution .top h3{color:inherit;margin:0;font-size:20px}
.solution .top small{opacity:.9}
.solution .list{padding:20px 22px;flex:1}
.solution .list li{list-style:none;padding:8px 0 8px 28px;position:relative;color:var(--ink);font-size:14.5px;border-bottom:1px dashed var(--line)}
.solution .list li:last-child{border-bottom:0}
.solution .list li::before{content:"\2714";position:absolute;left:0;color:var(--green);font-weight:800}
.solution .foot{padding:0 22px 24px;text-align:center}

/* Process steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;text-align:center;position:relative;box-shadow:var(--shadow-sm)}
.step .n{counter-increment:step;width:48px;height:48px;margin:0 auto 12px;border-radius:50%;
  background:linear-gradient(135deg,var(--gold),var(--gold-2));color:#3a2600;font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center}
.step .n::before{content:counter(step,decimal-leading-zero)}
.step h3{font-size:16.5px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14px;margin:0}

/* ============================================================ GALLERY */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gallery figure{margin:0;border-radius:var(--radius);overflow:hidden;position:relative;cursor:pointer;box-shadow:var(--shadow-sm);aspect-ratio:4/3;background:#dde5ee}
.gallery figure img{width:100%;height:100%;object-fit:cover;transition:.4s}
.gallery figure:hover img{transform:scale(1.07)}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:22px 14px 12px;color:#fff;font-size:14px;font-weight:600;
  background:linear-gradient(transparent,rgba(10,42,94,.85));opacity:0;transition:.25s}
.gallery figure:hover figcaption{opacity:1}
/* filter chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:28px}
.chip{border:1px solid var(--line);background:#fff;color:var(--ink);padding:8px 18px;border-radius:20px;font-weight:600;font-size:14px;cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--blue);color:var(--blue)}
.chip.active{background:linear-gradient(90deg,var(--blue),var(--cyan));color:#fff;border-color:transparent}

/* Lightbox */
.lightbox{position:fixed;inset:0;background:rgba(6,16,34,.92);display:none;align-items:center;justify-content:center;z-index:200;padding:20px}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:86vh;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.6)}
.lightbox .close{position:absolute;top:20px;right:26px;color:#fff;font-size:40px;cursor:pointer;line-height:1}
.lightbox .nav-arrow{position:absolute;top:50%;transform:translateY(-50%);color:#fff;font-size:44px;cursor:pointer;padding:10px 18px;user-select:none}
.lightbox .prev{left:10px}.lightbox .next{right:10px}

/* ============================================================ PAGE BANNER */
.page-banner{background:linear-gradient(100deg,var(--navy),var(--blue));color:#fff;padding:44px 0}
.page-banner h1{color:#fff;font-size:34px;margin:0 0 6px}
.page-banner .crumb{color:#cfe0f5;font-size:14px}
.page-banner .crumb a:hover{color:#fff;text-decoration:underline}

/* ============================================================ CONTENT */
.prose p{color:#33414f;margin:0 0 16px}
.prose h2{font-size:24px;margin-top:8px}
.prose h3{font-size:19px;color:var(--blue)}
.prose ul{padding-left:20px;color:#33414f}
.prose ul li{margin:6px 0}
.info-list{list-style:none;padding:0;margin:0}
.info-list li{display:flex;gap:12px;padding:12px 0;border-bottom:1px dashed var(--line);align-items:flex-start}
.info-list li .ic{color:var(--blue);font-size:18px;flex-shrink:0;margin-top:2px}
.info-list li b{color:var(--navy)}
.split{display:grid;grid-template-columns:1.1fr 1fr;gap:36px;align-items:center}
.media-round{border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}

/* ============================================================ NEWS */
.news-card .body .date{color:var(--gold-2);font-size:13px;font-weight:700;margin-bottom:6px;display:block}

/* ============================================================ CONTACT */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px;box-shadow:var(--shadow-sm)}
.form-row{margin-bottom:16px}
.form-row label{display:block;font-weight:600;font-size:14px;margin-bottom:6px;color:var(--navy)}
.form-row input,.form-row textarea,.form-row select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:14.5px;font-family:inherit;outline:none;transition:.15s}
.form-row input:focus,.form-row textarea:focus,.form-row select:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(21,119,209,.12)}
.map-embed{border-radius:16px;overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--line);min-height:260px}
.map-embed iframe{width:100%;height:100%;min-height:260px;border:0;display:block}

/* CTA band */
.cta-band{background:linear-gradient(100deg,var(--gold),var(--gold-2));color:#3a2600;text-align:center}
.cta-band .container{padding:40px 16px}
.cta-band h2{color:#3a2600;font-size:28px;margin-bottom:8px}
.cta-band p{margin:0 0 20px;font-size:16px}

/* ============================================================ FOOTER */
.footer{background:var(--navy);color:#cdddf1;padding:50px 0 0;font-size:14.5px}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:30px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer h4::after{content:"";position:absolute;left:0;bottom:0;width:38px;height:3px;background:var(--gold);border-radius:3px}
.footer a:hover{color:#fff}
.footer .fbrand{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.footer .fbrand img{height:52px;background:#fff;border-radius:8px;padding:4px}
.footer .fbrand b{color:#fff;font-size:17px;display:block}
.footer .flist{list-style:none;padding:0;margin:0}
.footer .flist li{padding:6px 0;display:flex;gap:9px;align-items:flex-start}
.footer .flist li .ic{color:var(--gold);flex-shrink:0}
.footer .socials{display:flex;gap:10px;margin-top:14px}
.footer .socials a{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center;font-size:17px;color:#fff;transition:.15s}
.footer .socials a:hover{background:var(--gold);color:#3a2600}
.footbar{border-top:1px solid rgba(255,255,255,.12);margin-top:40px;padding:16px 0;text-align:center;color:#9db6d6;font-size:13.5px}

/* ============================================================ FLOAT CONTACT */
.floats{position:fixed;right:16px;bottom:18px;z-index:120;display:flex;flex-direction:column;gap:12px}
.floats a{width:54px;height:54px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;box-shadow:0 6px 18px rgba(0,0,0,.25);position:relative}
.floats .zalo{background:#0068ff;font-size:13px;font-weight:800}
.floats .phone{background:var(--green);font-size:22px;animation:ring 1.4s infinite}
.floats .mess{background:#0084ff;font-size:24px}
@keyframes ring{0%,100%{transform:scale(1)}50%{transform:scale(1.08)}}

/* ============================================================ RESPONSIVE */
@media(max-width:980px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .split,.contact-wrap{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
  .hero h1{font-size:34px}
}
@media(max-width:760px){
  .search,.header-hotline{display:none}
  .header .container{padding:10px 16px}
  .nav .container{flex-wrap:wrap}
  .nav-toggle{display:block}
  .nav ul{display:none;flex-direction:column;width:100%}
  .nav ul.open{display:flex}
  .nav li a{padding:13px 16px;border-top:1px solid rgba(255,255,255,.08)}
  .stats .container{grid-template-columns:repeat(2,1fr)}
  .grid-4,.grid-3,.grid-2,.steps,.gallery{grid-template-columns:1fr 1fr}
  .topbar .tb-left span:nth-child(n+2){display:none}
  .hero-slide{min-height:420px}
  .hero h1{font-size:28px}
  .sec-head h2{font-size:24px}
}
@media(max-width:520px){
  .grid-4,.grid-3,.grid-2,.gallery,.steps,.footer .cols{grid-template-columns:1fr}
  .stats .container{grid-template-columns:1fr 1fr}
}