/* ===== Helin İzolasyon — stylesheet ===== */

:root{
  --black:#0b0b0d;
  --charcoal:#17171b;
  --charcoal-2:#202024;
  --gold:#c9a227;
  --gold-light:#e8c766;
  --navy:#13223f;
  --text:#232326;
  --text-muted:#5c5c66;
  --border:#e7e5e0;
  --bg:#ffffff;
  --bg-alt:#f7f6f3;
  --radius:14px;
  --shadow:0 10px 30px rgba(0,0,0,.08);
  --shadow-lg:0 20px 50px rgba(0,0,0,.18);
  --ff-head:'Poppins', sans-serif;
  --ff-body:'Inter', sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--ff-body);
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{font-family:var(--ff-head);line-height:1.2;margin:0 0 .5em;color:var(--black);}
p{margin:0 0 1em;color:var(--text-muted);}
ul{margin:0;padding:0;list-style:none;}
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 24px;}
.icon{width:20px;height:20px;fill:currentColor;flex:none;}
.icon-lg{width:34px;height:34px;stroke:var(--gold);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;margin-bottom:14px;}

.skip-link{
  position:absolute;left:-999px;top:0;background:var(--gold);color:#000;padding:10px 16px;z-index:1000;
}
.skip-link:focus{left:10px;top:10px;}

.gold{color:var(--gold);}
.eyebrow{
  font-family:var(--ff-head);
  text-transform:uppercase;
  letter-spacing:.14em;
  font-size:.78rem;
  font-weight:600;
  color:var(--gold);
  margin-bottom:.6em;
}
.eyebrow.center{text-align:center;}
.center{text-align:center;}
.section-lead{max-width:640px;margin:0 auto 40px;}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:999px;
  font-family:var(--ff-head);font-weight:600;font-size:.92rem;
  border:1.5px solid transparent;cursor:pointer;transition:.2s ease;white-space:nowrap;
}
.btn-lg{padding:15px 30px;font-size:1rem;}
.btn-primary{background:linear-gradient(135deg,var(--gold-light),var(--gold));color:#1a1408;}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px);}
.btn-outline{border-color:rgba(255,255,255,.55);color:#fff;}
.btn-outline:hover{background:rgba(255,255,255,.12);}
.btn-outline-light{border-color:rgba(255,255,255,.6);color:#fff;}
.btn-outline-light:hover{background:rgba(255,255,255,.15);}
.btn-ghost{color:var(--black);font-weight:600;}
.btn-ghost .icon{color:var(--gold);}

/* Header */
.site-header{
  position:sticky;top:0;z-index:200;
  background:#ffffff;
  border-bottom:1px solid var(--border);
}
.header-inner{display:flex;flex-wrap:nowrap;align-items:center;justify-content:space-between;gap:14px;padding:10px 24px;}
.brand{display:flex;align-items:center;gap:10px;min-width:0;flex:none;}
.brand-logo{width:42px;height:42px;object-fit:cover;border-radius:10px;flex:none;}
.brand-text{display:flex;flex-direction:column;line-height:1.22;min-width:0;}
.brand-text strong{font-family:var(--ff-head);font-size:1rem;color:var(--black);white-space:nowrap;}
.brand-text small{color:var(--text-muted);font-size:.7rem;letter-spacing:.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:none;}

.main-nav{display:flex;gap:24px;flex:none;}
.main-nav a{font-weight:600;font-size:.9rem;color:var(--text);position:relative;padding:6px 0;white-space:nowrap;}
.main-nav a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--gold);transition:.2s;}
.main-nav a:hover::after{width:100%;}
.main-nav a.active{color:var(--gold);}
.main-nav a.active::after{width:100%;}

.header-actions{display:flex;align-items:center;gap:8px;flex:none;}
.header-phone span{white-space:nowrap;}
.hamburger{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;border:none;background:none;cursor:pointer;padding:0;flex:none;
}
.hamburger span{display:block;width:100%;height:2px;background:var(--black);border-radius:2px;transition:.25s;}
.hamburger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.hamburger.is-open span:nth-child(2){opacity:0;}
.hamburger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* Hero */
.hero{position:relative;min-height:88vh;display:flex;align-items:center;color:#fff;overflow:hidden;}
.hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  transform:scale(1.05);
}
.hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,10,12,.55) 0%,rgba(10,10,12,.72) 55%,rgba(10,10,12,.92) 100%);
}
.hero-inner{position:relative;z-index:2;padding:120px 24px 90px;max-width:820px;}
.hero h1{font-size:clamp(2.1rem,4.6vw,3.4rem);color:#fff;margin-bottom:.45em;}
.hero-desc{color:rgba(255,255,255,.85);font-size:1.08rem;max-width:640px;}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:8px;}

/* Inner page header (non-home pages) */
.page-header{
  background:linear-gradient(135deg,var(--navy),var(--black));
  color:#fff;padding:64px 0 54px;
}
.page-header .eyebrow{color:var(--gold-light);}
.page-header h1{color:#fff;font-size:clamp(1.9rem,4vw,2.6rem);margin-bottom:.35em;}
.page-header p{color:rgba(255,255,255,.75);max-width:620px;margin:0;}
.breadcrumb{display:flex;gap:8px;align-items:center;font-size:.82rem;color:rgba(255,255,255,.55);margin-bottom:14px;}
.breadcrumb a{color:rgba(255,255,255,.75);}
.breadcrumb a:hover{color:var(--gold-light);}

/* Trust strip */
.trust-strip{background:var(--navy);color:#fff;padding:22px 0;}
.trust-inner{display:flex;flex-wrap:wrap;align-items:center;gap:18px 28px;justify-content:space-between;}
.trust-inner p{color:rgba(255,255,255,.85);margin:0;flex:1;min-width:260px;font-size:.95rem;}
.avista-badge{display:flex;flex-direction:column;line-height:1.1;flex:none;}
.avista-word{font-family:var(--ff-head);font-weight:800;font-size:1.5rem;letter-spacing:.03em;color:#fff;}
.avista-sub{font-size:.62rem;letter-spacing:.22em;color:var(--gold-light);}
.trust-link{flex:none;font-weight:600;font-size:.9rem;color:var(--gold-light);white-space:nowrap;}
.trust-link:hover{text-decoration:underline;}

/* Sections */
.section{padding:90px 0;}
.section-alt{background:var(--bg-alt);}
.section h2{font-size:clamp(1.6rem,3vw,2.3rem);}
.section h2.center{margin-left:auto;margin-right:auto;}

/* About split */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center;}
.check-list{margin:22px 0 28px;display:flex;flex-direction:column;gap:12px;}
.check-list li{position:relative;padding-left:30px;color:var(--text);font-weight:500;}
.check-list li::before{
  content:"";position:absolute;left:0;top:4px;width:18px;height:18px;border-radius:50%;
  background:var(--gold);
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M20 6 9 17l-5-5' fill='none' stroke='%23000' stroke-width='3'/%3E%3C/svg%3E") center/60% no-repeat;
  mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M20 6 9 17l-5-5' fill='none' stroke='%23000' stroke-width='3'/%3E%3C/svg%3E") center/60% no-repeat;
}
.cert-frame{
  position:relative;display:block;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-lg);border:1px solid var(--border);background:#fff;
}
.cert-frame img{width:100%;}
.cert-badge{
  position:absolute;bottom:16px;left:16px;background:rgba(11,11,13,.82);color:var(--gold-light);
  font-family:var(--ff-head);font-weight:600;font-size:.78rem;padding:8px 14px;border-radius:999px;
  letter-spacing:.03em;
}

/* Service cards */
.group-title{font-family:var(--ff-head);font-size:1.15rem;margin:44px 0 20px;color:var(--black);}
.group-title:first-of-type{margin-top:0;}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.svc-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:26px 24px;transition:.2s ease;
}
.svc-card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:transparent;}
.svc-card .svc-icon{
  width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,var(--gold-light),var(--gold));
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;flex:none;
}
.svc-card .svc-icon svg{width:24px;height:24px;stroke:#1a1408;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.svc-card h4{font-size:1.02rem;margin-bottom:6px;}
.svc-card .svc-tag{font-size:.82rem;color:var(--gold);font-weight:600;margin-bottom:10px;display:block;}
.svc-card ul{display:flex;flex-direction:column;gap:6px;}
.svc-card li{font-size:.86rem;color:var(--text-muted);position:relative;padding-left:16px;}
.svc-card li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;border-radius:50%;background:var(--gold);}

.svc-card-compact{display:block;}
.svc-card-compact .svc-tag{margin-bottom:0;}

.services-preview-cta{text-align:center;margin-top:36px;}

.stat-banner{
  margin-top:50px;background:var(--black);border-radius:var(--radius);
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;overflow:hidden;
}
.stat-item{padding:30px 20px;text-align:center;border-left:1px solid rgba(255,255,255,.08);}
.stat-item:first-child{border-left:none;}
.stat-item strong{display:block;font-family:var(--ff-head);font-size:1.7rem;color:var(--gold-light);margin-bottom:6px;}
.stat-item span{font-size:.82rem;color:rgba(255,255,255,.7);}

/* Products */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.product-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;
  transition:.2s ease;
}
.product-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);}
.product-card img{width:100%;aspect-ratio:4/3.2;object-fit:cover;background:#f2f1ed;}
.product-body{padding:22px 22px 26px;}
.product-body h3{font-size:1.08rem;}
.product-body p{font-size:.9rem;margin:0;}
.cta-inline{text-align:center;margin-top:44px;}

/* Video gallery */
.video-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.video-card{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#000;}
.video-card video{width:100%;display:block;aspect-ratio:9/16;max-height:560px;object-fit:cover;background:#000;}

/* Photo gallery */
.photo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.photo-card{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:4/3.4;}
.photo-card img{width:100%;height:100%;object-fit:cover;transition:.3s ease;}
.photo-card:hover img{transform:scale(1.06);}

/* Why us */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;}
.why-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;text-align:left;
}
.why-card h3{font-size:1rem;}
.why-card p{font-size:.88rem;margin:0;}

/* CTA banner */
.cta-banner{
  background:linear-gradient(135deg,var(--navy),var(--black));
  color:#fff;padding:70px 0;
}
.cta-banner-inner{text-align:center;max-width:640px;margin:0 auto;}
.cta-banner h2{color:#fff;}
.cta-banner p{color:rgba(255,255,255,.78);}
.cta-banner .hero-cta{justify-content:center;}

/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.contact-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:32px 24px;text-align:center;transition:.2s ease;
}
a.contact-card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:transparent;}
.contact-card .icon-lg{margin:0 auto 14px;}
.contact-card h3{font-size:1rem;margin-bottom:4px;}
.contact-card p{margin:0;font-size:.92rem;}

/* Footer */
.site-footer{background:var(--black);color:rgba(255,255,255,.75);padding:64px 0 0;}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-logo{width:56px;height:56px;border-radius:10px;margin-bottom:14px;object-fit:cover;}
.footer-brand p{color:rgba(255,255,255,.75);margin:0 0 4px;font-weight:600;}
.footer-muted{color:rgba(255,255,255,.5) !important;font-weight:400 !important;font-size:.85rem;}
.footer-links,.footer-contact{display:flex;flex-direction:column;gap:12px;}
.footer-links h4,.footer-contact h4{color:#fff;font-family:var(--ff-head);font-size:.95rem;margin-bottom:6px;}
.footer-links a,.footer-contact a,.footer-contact span{color:rgba(255,255,255,.65);font-size:.92rem;}
.footer-links a:hover,.footer-contact a:hover{color:var(--gold-light);}
.footer-bottom{padding:22px 0;text-align:center;font-size:.8rem;color:rgba(255,255,255,.45);}

/* Floating WhatsApp */
.whatsapp-float{
  position:fixed;right:22px;bottom:22px;z-index:300;
  width:58px;height:58px;border-radius:50%;
  background:#25D366;display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 26px rgba(0,0,0,.28);
  transition:.2s ease;
}
.whatsapp-float:hover{transform:scale(1.06);}
.whatsapp-float svg{width:30px;height:30px;fill:#fff;}

/* Responsive */
@media (min-width:1150px){
  .brand-text small{display:block;}
}

@media (max-width:1000px){
  .split{grid-template-columns:1fr;gap:40px;}
  .split-media{order:-1;}
  .card-grid{grid-template-columns:repeat(2,1fr);}
  .product-grid{grid-template-columns:repeat(2,1fr);}
  .why-grid{grid-template-columns:repeat(2,1fr);}
  .photo-grid{grid-template-columns:repeat(2,1fr);}
  .stat-banner{grid-template-columns:repeat(2,1fr);}
  .stat-item:nth-child(3){border-left:none;}
  .stat-item{border-bottom:1px solid rgba(255,255,255,.08);}
  .contact-grid{grid-template-columns:1fr;}
  .footer-inner{grid-template-columns:1fr 1fr;}
}

@media (max-width:980px){
  .main-nav{
    position:fixed;top:65px;left:0;right:0;bottom:0;
    background:#fff;flex-direction:column;gap:0;padding:10px 24px 30px;
    transform:translateY(-110%);opacity:0;pointer-events:none;
    transition:.25s ease;overflow-y:auto;z-index:150;
  }
  .main-nav.is-open{transform:translateY(0);opacity:1;pointer-events:auto;}
  .main-nav a{padding:16px 0;border-bottom:1px solid var(--border);font-size:1.05rem;display:block;}
  .hamburger{display:flex;}
  .header-whatsapp span{display:none;}
  .header-whatsapp{padding:12px;}
}

@media (max-width:560px){
  .header-phone span{display:none;}
  .header-phone{padding:10px;}
}

@media (max-width:760px){
  .card-grid{grid-template-columns:1fr;}
  .product-grid{grid-template-columns:1fr;}
  .why-grid{grid-template-columns:1fr;}
  .video-grid{grid-template-columns:1fr;}
  .stat-banner{grid-template-columns:1fr;}
  .stat-item{border-left:none !important;}
  .footer-inner{grid-template-columns:1fr;text-align:left;}
  .hero-inner{padding:100px 20px 70px;}
  .section{padding:64px 0;}
}