/* ==========================================================================
   ANH TÚ SOLAR — Web chính (design system dùng chung cho mọi trang)
   ========================================================================== */
:root{
  --navy:#0b2545; --navy2:#13315c; --sky:#0a7cff; --sun:#ff9500; --sun2:#ffb703;
  --green:#1faa59; --ink:#12233b; --muted:#5c6b80; --line:#e6ebf2; --bg:#f5f8fc;
  --card:#ffffff; --radius:16px; --shadow:0 10px 30px rgba(11,37,69,.10);
  --maxw:1160px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 18px}
.center{text-align:center}
.mx-auto{margin-left:auto;margin-right:auto}
section{padding:66px 0}
h1,h2,h3,h4{line-height:1.2;letter-spacing:-.4px}
.eyebrow{display:inline-block;font-weight:800;letter-spacing:.5px;text-transform:uppercase;font-size:12.5px;
  color:var(--sun);background:rgba(255,149,0,.12);padding:6px 12px;border-radius:999px}
h2.sec{font-size:clamp(25px,4.4vw,37px);font-weight:900}
.sub{color:var(--muted);font-size:17px;max-width:660px}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:800;border:none;
  border-radius:999px;cursor:pointer;padding:14px 26px;font-size:16px;line-height:1;transition:.18s;text-align:center}
.btn-sun{background:linear-gradient(135deg,var(--sun),var(--sun2));color:#3b2600;box-shadow:0 8px 20px rgba(255,149,0,.35)}
.btn-sun:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,149,0,.45)}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy2)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1.5px solid rgba(255,255,255,.55)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-block{width:100%}

/* Header / Nav */
header.site{position:sticky;top:0;z-index:50;background:rgba(11,37,69,.94);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.08)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:900;font-size:19px}
.brand .logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--sun),var(--sun2));display:grid;place-items:center;font-size:20px}
.brand small{display:block;font-size:10.5px;font-weight:600;color:#b3c8e2;letter-spacing:1px}
.nav{display:flex;align-items:center;gap:26px}
.nav a.link{color:#dce7f5;font-weight:600;font-size:15px;position:relative}
.nav a.link:hover,.nav a.link.active{color:#fff}
.nav a.link.active::after{content:"";position:absolute;left:0;right:0;bottom:-22px;height:3px;background:var(--sun);border-radius:3px}
.nav .phone{color:#fff;font-weight:900;font-size:16px}
.nav .phone span{color:var(--sun2)}
.menu-btn{display:none;background:none;border:none;color:#fff;font-size:26px;cursor:pointer}
@media(max-width:900px){
  .nav{position:fixed;inset:66px 0 auto 0;flex-direction:column;align-items:flex-start;gap:0;background:var(--navy);
    padding:8px 18px 18px;border-bottom:1px solid rgba(255,255,255,.1);display:none}
  .nav.open{display:flex}
  .nav a.link{width:100%;padding:14px 4px;border-bottom:1px solid rgba(255,255,255,.08)}
  .nav a.link.active::after{display:none}
  .nav .btn,.nav .phone{margin-top:12px}
  .menu-btn{display:block}
}

/* Hero */
.hero{background:radial-gradient(1100px 480px at 82% -10%,rgba(255,149,0,.20),transparent 60%),
  linear-gradient(160deg,rgba(11,37,69,.92),rgba(19,49,92,.82)),url('images/hero-solar.jpg') center/cover no-repeat;
  color:#fff;position:relative;overflow:hidden}
.hero .wrap{padding:70px 18px 76px;position:relative;z-index:2;max-width:820px}
.hero h1{font-size:clamp(30px,5.4vw,50px);font-weight:900;letter-spacing:-1px}
.hero h1 .hl{color:var(--sun2)}
.hero p.lead{font-size:19px;color:#d9e4f3;margin-top:18px;max-width:640px}
.hero .cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.trust-row{display:flex;gap:22px;flex-wrap:wrap;margin-top:28px}
.trust-row .t{display:flex;align-items:center;gap:9px;font-size:14.5px;color:#cfe0f5;font-weight:600}
.tick{width:22px;height:22px;border-radius:50%;background:var(--green);display:grid;place-items:center;flex:none;font-size:12px;color:#fff}

/* Cards / grids */
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 4px 14px rgba(11,37,69,.05);transition:.2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d5e2f3}
.card .ic{width:54px;height:54px;border-radius:14px;background:linear-gradient(135deg,rgba(255,149,0,.15),rgba(255,183,3,.2));display:grid;place-items:center;font-size:26px;margin-bottom:14px}
.card h4{font-size:19px;font-weight:800;margin-bottom:6px}
.card p{color:var(--muted);font-size:15px}
.card ul{list-style:none;display:grid;gap:8px;margin-top:10px}
.card li{font-size:14.5px;display:flex;gap:9px;align-items:flex-start}
.card li .d{width:8px;height:8px;border-radius:50%;background:var(--green);margin-top:8px;flex:none}

/* Photo cards */
.photo{position:relative;border-radius:16px;overflow:hidden;aspect-ratio:4/3;border:1px solid var(--line);box-shadow:0 6px 18px rgba(11,37,69,.08)}
.photo img{width:100%;height:100%;object-fit:cover}
.photo .cap{position:absolute;left:0;right:0;bottom:0;padding:22px 14px 11px;background:linear-gradient(transparent,rgba(11,37,69,.82));color:#fff;font-weight:800;font-size:14.5px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px;margin-top:36px}
.step{text-align:center}
.step .num{width:52px;height:52px;border-radius:50%;background:var(--navy);color:#fff;font-weight:900;font-size:21px;display:grid;place-items:center;margin:0 auto 12px;box-shadow:0 8px 18px rgba(11,37,69,.25)}
.step h4{font-size:16px;font-weight:800;margin-bottom:4px}
.step p{font-size:13.5px;color:var(--muted)}

/* Two-column */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}

/* Trust list (light bg) */
.checklist{list-style:none;display:grid;gap:11px;margin-top:18px}
.checklist li{display:flex;gap:10px;align-items:flex-start;font-size:15.5px;font-weight:600}

/* Band (dark CTA) */
.band{background:linear-gradient(135deg,var(--sun),var(--sun2));color:#3b2600}
.band h2{font-size:clamp(24px,4.4vw,38px);font-weight:900}
.band p{font-size:18px;margin-top:10px;font-weight:600}
.band-navy{background:linear-gradient(160deg,var(--navy),var(--navy2));color:#fff}
.band-navy .sub{color:#cfe0f5}

/* FAQ */
.faq{max-width:820px;margin:30px auto 0}
.qa{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:12px;overflow:hidden}
.qa summary{list-style:none;cursor:pointer;padding:18px 46px 18px 20px;font-weight:800;font-size:16px;position:relative;line-height:1.55}
.qa summary::-webkit-details-marker{display:none}
.qa summary .plus{color:var(--sun);font-size:22px;transition:.2s;position:absolute;right:20px;top:16px}
.qa[open] summary .plus{transform:rotate(45deg)}
.qa .a{padding:0 20px 18px;color:var(--muted);font-size:15px}

/* Footer */
footer.site{background:var(--navy);color:#cfe0f5;padding:46px 0 30px}
footer.site .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(185px,1fr));gap:30px}
footer.site h5{color:#fff;font-size:15px;font-weight:800;margin-bottom:12px}
footer.site a,footer.site p{font-size:14px;color:#bcd0ea;margin-bottom:7px;display:block}
footer.site a:hover{color:#fff}
.foot-brand{color:#fff;font-weight:900;font-size:20px;display:flex;align-items:center;gap:9px;margin-bottom:10px}
.copy{border-top:1px solid rgba(255,255,255,.1);margin-top:28px;padding-top:18px;font-size:12.5px;color:#a9c0dd}

/* Floating + mobile call bar */
.callbar{position:fixed;left:0;right:0;bottom:0;z-index:60;display:none;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 20px rgba(11,37,69,.12);padding:10px 12px;gap:10px}
.callbar a{flex:1;padding:14px;border-radius:12px;font-weight:800;font-size:15px;text-align:center;display:flex;align-items:center;justify-content:center;gap:7px}
.callbar .call{background:var(--navy);color:#fff;flex:1}
.callbar .zalo{background:#0068ff;color:#fff;order:-1;flex:1.5}

/* Responsive */
@media(max-width:900px){
  .grid-3,.grid-4{grid-template-columns:1fr 1fr}
  .two-col{grid-template-columns:1fr;gap:26px}
  .steps{grid-template-columns:1fr 1fr}
  footer.site .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  section{padding:48px 0}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr}
  footer.site .cols{grid-template-columns:1fr}
  .callbar{display:flex}
  body{padding-bottom:64px}
  html,body{overflow-x:hidden}
  .hero .wrap{padding-left:16px;padding-right:16px;min-width:0}
  .hero h1{font-size:clamp(24px,7.2vw,34px);letter-spacing:-.3px;overflow-wrap:anywhere}
  .hero .eyebrow,.hero p.lead{overflow-wrap:anywhere}
  .hero h1 span[style*="nowrap"],.hero .eyebrow span[style*="nowrap"],.hero p.lead span[style*="nowrap"],.trust-row .t span[style*="nowrap"]{white-space:normal}
  .trust-row{gap:12px}.trust-row .t{white-space:normal}
  .hero .cta-row .btn{flex:1 1 100%;justify-content:center}
}

/* Cân dòng tiếng Việt — tránh từ ghép rớt dòng / chữ mồ côi */
h1,h2,h3,h4{text-wrap:balance}
p,li{text-wrap:pretty}

/* Bo chon nhom khach ngay tren hero */
.seg-pick{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.seg-pick a{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.30);color:#fff;padding:9px 14px;border-radius:999px;font-weight:700;font-size:14.5px;text-decoration:none;transition:.15s}
.seg-pick a:hover{background:rgba(255,255,255,.22);transform:translateY(-1px)}