/* BuildX Energy — green & white theme, Apple-style typography */
:root{
  --background:#ffffff;
  --foreground:#0f1f16;
  --card:#ffffff;
  --primary:#1faa4b;
  --primary-deep:#116634;
  --primary-glow:#5fe08a;
  --primary-foreground:#ffffff;
  --secondary:#f2f8f3;
  --muted-foreground:#5d6b62;
  --border:#e3ebe5;
  --radius:20px;
  --gradient-primary:linear-gradient(135deg,var(--primary-deep),var(--primary) 55%,var(--primary-glow));
  --shadow-soft:0 1px 2px rgba(20,60,35,.06),0 12px 32px -12px rgba(20,80,45,.18);
  --shadow-lift:0 24px 60px -24px rgba(20,80,45,.35);
  --font-display:"SF Pro Display",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Helvetica,Arial,sans-serif;
  --font-sans:"SF Pro Text",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Helvetica,Arial,sans-serif;
  --ease:cubic-bezier(.16,1,.3,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--background);color:var(--foreground);font-family:var(--font-sans);-webkit-font-smoothing:antialiased;line-height:1.6}
h1,h2,h3{font-family:var(--font-display);letter-spacing:-.025em;line-height:1.1}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
.container.narrow{max-width:900px}
.container.narrow-sm{max-width:760px}
.section{padding:96px 20px}
.band{background:var(--secondary);padding:96px 0}
.center{text-align:center}
.muted{color:var(--muted-foreground)}
.small{font-size:.9rem}
.strong{font-weight:600}
.mt-6{margin-top:24px}.mt-14{margin-top:56px}
.text-gradient{background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text;color:transparent}

/* Header */
#siteHeader{position:fixed;inset:0 0 auto 0;z-index:50;transition:background .5s var(--ease),box-shadow .5s var(--ease),border-color .5s}
#siteHeader.scrolled{background:rgba(255,255,255,.82);backdrop-filter:blur(18px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;padding-top:12px;padding-bottom:12px}
.brand img{height:36px;width:auto}
.nav-links{display:none;align-items:center;gap:28px}
.nav-links a{font-size:.9rem;font-weight:500;transition:color .3s}
.nav-links a:hover{color:var(--primary)}
.menu-btn{border:1px solid var(--border);background:rgba(255,255,255,.7);border-radius:10px;padding:8px 12px;font-size:.9rem;font-family:inherit;cursor:pointer}
.mobile-menu{display:none;flex-direction:column;gap:4px;background:#fff;border-top:1px solid var(--border);padding:12px 20px 20px}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:8px 12px;border-radius:10px;font-size:.92rem;font-weight:500}
.mobile-menu a:hover{background:var(--secondary)}
@media(min-width:1024px){.nav-links{display:flex}.menu-btn{display:none}.mobile-menu{display:none!important}}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:999px;padding:12px 22px;font-size:.9rem;font-weight:600;font-family:inherit;cursor:pointer;transition:transform .3s var(--ease),background .3s}
.btn-primary{background-image:var(--gradient-primary);color:var(--primary-foreground);box-shadow:var(--shadow-soft)}
.btn-primary:hover{transform:scale(1.04)}
.btn-ghost{border:1px solid rgba(255,255,255,.4);background:rgba(255,255,255,.12);color:#fff;backdrop-filter:blur(10px)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-lg{padding:16px 28px}
.btn-sm{padding:10px 20px}
.btn.full{width:100%;border-radius:14px}

/* Hero */
.hero{position:relative;display:flex;align-items:center;min-height:92vh;overflow:hidden}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(17,102,52,.88),rgba(17,102,52,.55) 45%,transparent)}
.hero-content{position:relative;padding-top:112px;padding-bottom:64px}
.hero-kicker{font-size:.82rem;font-weight:500;text-transform:uppercase;letter-spacing:.22em;color:rgba(255,255,255,.82)}
.hero h1{margin-top:20px;max-width:820px;font-size:clamp(2.6rem,6vw,4.6rem);font-weight:600;color:#fff}
.hero-sub{margin-top:22px;max-width:520px;font-size:1.1rem;color:rgba(255,255,255,.88)}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:38px}

/* Section heads */
.section-head{max-width:640px;margin:0 auto 56px;text-align:center}
.eyebrow{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.18em;color:var(--primary)}
.eyebrow.light{color:rgba(255,255,255,.85)}
.section-head h2{margin-top:12px;font-size:clamp(2rem,4vw,3rem);font-weight:600}
.section-head h2.light{color:#fff}
.section-head .sub{margin-top:14px;color:var(--muted-foreground)}
.prose{max-width:760px;margin:0 auto;text-align:center;font-size:1.08rem;color:var(--muted-foreground)}

/* Grids + cards */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:1fr}
.grid-3,.grid-4,.grid-5{grid-template-columns:1fr}
@media(min-width:640px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}.grid-5{grid-template-columns:repeat(5,1fr)}}
.card{height:100%;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow-soft)}
.card h3{font-size:1.2rem;font-weight:600}
.card p{margin-top:12px}
.hover-lift{transition:transform .5s var(--ease),box-shadow .5s var(--ease)}
.hover-lift:hover{transform:translateY(-6px);box-shadow:var(--shadow-lift)}
.num{display:flex;align-items:center;justify-content:center;width:48px;height:48px;margin-bottom:22px;border-radius:16px;background-image:var(--gradient-primary);color:#fff;font-weight:600}
.pill{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px 22px;box-shadow:var(--shadow-soft);font-weight:500;transition:border-color .3s}
.pill:hover{border-color:rgba(31,170,75,.5)}
.tick{display:flex;align-items:center;justify-content:center;flex:0 0 28px;height:28px;border-radius:999px;background-image:var(--gradient-primary);color:#fff;font-size:.75rem}
.brand-list{margin-top:18px;list-style:none;color:var(--muted-foreground);font-size:.9rem}
.brand-list li{margin-top:8px}
.circle{display:flex;align-items:center;justify-content:center;width:44px;height:44px;margin:0 auto 16px;border-radius:999px;background-image:var(--gradient-primary);color:#fff;font-weight:600}
.step{font-size:.85rem;font-weight:600;color:var(--primary)}
.tag{font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;color:var(--primary)}
.small-title{margin-top:8px;font-size:1rem;font-weight:500}

/* Future tech */
.future{position:relative;overflow:hidden;background-image:var(--gradient-primary);padding:96px 0}
.glass-card{height:100%;border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.12);border-radius:var(--radius);padding:32px;backdrop-filter:blur(10px);transition:transform .5s var(--ease)}
.glass-card:hover{transform:translateY(-6px)}
.glass-card .emoji{font-size:1.9rem}
.glass-card p{margin-top:14px;font-size:1.05rem;font-weight:500;color:#fff}

/* Projects */
.project{padding:0;overflow:hidden}
.project-img{overflow:hidden}
.project-img img{height:260px;width:100%;object-fit:cover;transition:transform .7s var(--ease)}
.project:hover .project-img img{transform:scale(1.06)}
.project-body{padding:26px}

/* Calculator */
.calc{display:grid;gap:32px}
@media(min-width:768px){.calc{grid-template-columns:1fr 1fr;padding:40px}}
.calc-inputs label,.field-label{display:block;font-size:.88rem;font-weight:500;color:var(--muted-foreground);margin-bottom:8px}
.calc-inputs label+label{margin-top:20px}
input,select,textarea{width:100%;border:1px solid var(--border);background:#fff;border-radius:14px;padding:12px 16px;font-size:.92rem;font-family:inherit;color:inherit;outline:none;transition:border-color .25s,box-shadow .25s}
input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(31,170,75,.22)}
.calc-inputs input,.calc-inputs select{margin-top:6px}
.type-toggle{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:6px}
.type-btn{border:1px solid var(--border);background:#fff;border-radius:14px;padding:12px 16px;font-size:.9rem;font-weight:500;font-family:inherit;cursor:pointer;transition:all .3s var(--ease)}
.type-btn:hover{border-color:rgba(31,170,75,.5)}
.type-btn.active{border-color:transparent;background-image:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-soft)}
.calc-results{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-self:start}
.stat{border:1px solid var(--border);background:rgba(242,248,243,.7);border-radius:16px;padding:18px}
.stat-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted-foreground)}
.stat-value{margin-top:8px;font-size:1.45rem;font-weight:600;color:var(--primary-deep)}
.calc-results .btn{grid-column:span 2}

/* FAQ */
.faq-list{display:grid;gap:12px}
.faq{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px 24px;box-shadow:var(--shadow-soft)}
.faq summary{display:flex;align-items:center;justify-content:space-between;gap:16px;cursor:pointer;list-style:none;font-weight:500}
.faq summary::-webkit-details-marker{display:none}
.faq .plus{color:var(--primary);transition:transform .3s var(--ease)}
.faq[open] .plus{transform:rotate(45deg)}
.faq p{margin-top:12px}

/* Contact */
.form{display:grid;gap:14px}
.form h3{margin-bottom:4px}
.contact-list{list-style:none;margin-top:20px;display:grid;gap:12px;font-size:.92rem;color:var(--muted-foreground)}
.contact-list a:hover{color:var(--primary)}
.map-card{margin-top:24px;padding:0;overflow:hidden}
.map-card iframe{display:block;width:100%;height:288px;border:0}
.form-msg{min-height:20px;font-size:.85rem;color:var(--primary-deep)}

footer{border-top:1px solid var(--border);background:#fff;padding:48px 0}
footer .container{display:flex;flex-direction:column;align-items:center;gap:14px}
.footer-logo{height:40px;width:auto}

.whatsapp-fab{position:fixed;right:24px;bottom:24px;z-index:50;display:flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:999px;background-image:var(--gradient-primary);color:#fff;font-size:1.4rem;box-shadow:var(--shadow-lift);animation:float-slow 6s ease-in-out infinite}
@keyframes float-slow{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal[data-visible="true"]{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.whatsapp-fab{animation:none}}