:root {
  --luxury-white: #f8f8f6;
  --premium-gray: #d3d4d8;
  --premium-dark-gray: #b9bbc0;
  --text-black: #0b0b0b;
  --accent: #0f1724;
  --max-width: 1200px;
}

* { box-sizing: border-box; }
html,body { height:100%; margin:0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial; color:var(--text-black); background:var(--luxury-white); -webkit-font-smoothing:antialiased; }
.container { max-width:var(--max-width); margin:0 auto; padding:1rem; }
.site-header { background:linear-gradient(180deg, rgba(255,255,255,0.6), rgba(250,250,250,0.9)); border-bottom:1px solid var(--premium-dark-gray); position:sticky; top:0; z-index:50; }
.site-header { position:sticky; top:0; z-index:60; }
.header-inner { display:flex; align-items:flex-start; justify-content:space-between; gap:1rem; padding:8px 0; }
.logo { font-weight:800; color:var(--accent); text-decoration:none; font-size:1.05rem; }
.main-nav a { color:var(--premium-dark-gray); text-decoration:none; margin-left:0.8rem; font-weight:700; padding:4px 6px; display:inline-block; font-size:0.9rem; }

/* Desktop premium glass topbar */
@media (min-width: 900px) {
  .site-header { background: rgba(6,10,15,0.85); backdrop-filter: blur(6px); border-bottom: 1px solid rgba(255,255,255,0.04); }
  .header-inner { padding:8px 0; }
  .main-nav a { color: var(--premium-dark-gray); }
  .main-nav a:hover, .main-nav a:focus { color: #ffffff; text-decoration: none; }
  /* brand name white on desktop */
  .site-header .logo span { color: #f8f8f6 !important; }
}

/* responsive nav */
.main-nav { display:flex; gap:0.5rem; align-items:center; }
.nav-toggle { display:none; background:transparent; border:1px solid var(--premium-gray); padding:6px 8px; border-radius:6px; cursor:pointer; }
.nav-toggle span { display:block; width:18px; height:2px; background:var(--text-black); margin:4px 0; transition:transform .2s; }

@media (max-width:900px) {
  .nav-toggle { display:block; }
  .main-nav { position:fixed; top:64px; right:0; background:white; flex-direction:column; gap:0; padding:12px; border-left:1px solid var(--premium-gray); transform:translateX(100%); transition:transform .28s ease; min-width:220px; z-index:100; }
  .main-nav.open { transform:translateX(0); box-shadow: -6px 0 18px rgba(0,0,0,0.06); }
  .main-nav a { margin:0; padding:10px 8px; border-bottom:1px solid #f2f2f2; width:100%; }
}

/* mobile nav glass look and scrolling */
.main-nav.open {
  background: rgba(6,10,15,0.92); /* deep black glass */
  backdrop-filter: blur(6px);
  color: var(--luxury-white);
}
.main-nav.open a { color: var(--luxury-white); }
.main-nav.open { max-height: calc(100vh - 64px); overflow-y: auto; -webkit-overflow-scrolling: touch; }

/* prevent body scroll when nav open */
.no-scroll { overflow: hidden !important; touch-action: none; }

/* overlay when mobile nav open */
.nav-overlay { position:fixed; inset:0; background:rgba(6,10,15,0.45); z-index:95; opacity:0; transition:opacity .22s ease; pointer-events:none; }
.nav-overlay.open { opacity:1; pointer-events:auto; }

/* nav close button */
.main-nav .nav-close { display:block; margin-bottom:8px; background:transparent; border:0; color:var(--luxury-white); text-align:right; font-size:1.05rem; padding:6px 8px; cursor:pointer; }
.main-nav .nav-close svg { width:20px; height:20px; vertical-align:middle; fill:var(--luxury-white); }

/* improved scrolling bounce feel */
.main-nav.open { overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }

/* desktop nav alignment & colors */
.main-nav { align-items:flex-start; }
.main-nav a { color: var(--premium-dark-gray); padding-top:6px; padding-bottom:6px; }
.main-nav a:hover { color: var(--text-black); }
.hero { padding:2.5rem 0; text-align:center; }
.hero h1 { font-size:2.25rem; margin:0; letter-spacing:0.4px; color:var(--accent); }
.lead { color:var(--premium-dark-gray); margin-top:0.5rem; }
.cta-row { margin-top:1rem; display:flex; gap:0.5rem; justify-content:center; }
#search-input { padding:0.75rem 1rem; width:min(640px,70%); border:1px solid var(--premium-dark-gray); border-radius:6px; background:white; color:var(--text-black); }
#search-btn { padding:0.75rem 1rem; background:var(--accent); color:white; border:none; border-radius:6px; cursor:pointer; font-weight:700; }

/* CTA row / search improvements */
.cta-row { display:flex; gap:0.5rem; align-items:center; flex-wrap:wrap; }
.cta-row #search-input { padding:0.65rem 0.9rem; border-radius:10px; border:1px solid rgba(185,187,192,0.28); box-shadow: 0 6px 18px rgba(15,23,36,0.04); font-size:0.95rem; width:100%; max-width:520px; }
.cta-row .btn-primary { padding:0.6rem 0.9rem; border-radius:10px; font-size:0.95rem; }
.cta-row a.btn-primary { padding:0.6rem 0.9rem; border-radius:10px; font-size:0.95rem; background:transparent; border:1px solid rgba(255,255,255,0.06); color:var(--luxury-white); }

/* mobile: stack search and action buttons, make inputs larger tap targets */
@media (max-width:700px) {
  .hero { padding:18px; }
  .hero .cta-row { flex-direction:column; align-items:stretch; gap:0.6rem; }
  .cta-row #search-input { max-width:100%; font-size:1rem; padding:0.8rem 0.9rem; }
  .cta-row .btn-primary, .cta-row a.btn-primary { width:100%; display:block; font-size:1rem; padding:0.9rem; }
}

/* hero carousel */
.hero-carousel { max-width:320px; margin-left:auto; }
.carousel-slides { position:relative; width:100%; height:220px; border-radius:8px; overflow:hidden; background:#efefef; display:block; }
.carousel-slide { position:absolute; inset:0; width:100%; height:100%; object-fit:cover; opacity:0; transform:translateX(6%); transition:opacity .6s ease, transform .6s ease; content-visibility:auto; }
.carousel-slide.active { opacity:1; transform:translateX(0); }
/* First slide: no transition on initial paint so LCP renders instantly */
.carousel-slide:first-child { transition-duration:0s; }
.carousel-slide.js-animated:first-child { transition-duration:.6s; }
.carousel-slide:nth-child(1) { transition-delay:0ms; }
.carousel-slide:nth-child(2) { transition-delay:50ms; }
.carousel-slide:nth-child(3) { transition-delay:80ms; }
.carousel-slide:nth-child(4) { transition-delay:100ms; }
.carousel-slide:nth-child(5) { transition-delay:120ms; }
.carousel-slide:nth-child(6) { transition-delay:140ms; }

@media (max-width:700px) {
  .hero-carousel { max-width:100%; order:2; margin-top:12px; }
  .carousel-slides { height:180px; }
}

/* estimate modal */
.estimate-modal-overlay { position:fixed; inset:0; background:rgba(6,10,15,0.5); display:none; align-items:center; justify-content:center; z-index:200; }
.estimate-modal-overlay.open { display:flex; }
.estimate-modal { width:100%; max-width:720px; background:linear-gradient(180deg,#fff,#fbfbfb); border-radius:8px; box-shadow:0 20px 60px rgba(6,10,15,0.2); padding:16px; }
.estimate-modal header { display:flex; justify-content:space-between; align-items:center; gap:12px; }
.estimate-modal .close-btn { background:transparent;border:0;font-size:1.05rem;cursor:pointer;color:var(--premium-dark-gray); }
.estimate-modal .estimate-table { width:100%; border-collapse:collapse; margin-top:12px; }
.estimate-modal .estimate-table td, .estimate-modal .estimate-table th { padding:8px; border-bottom:1px solid #f2f2f2; text-align:right; }
.estimate-modal .estimate-table th { text-align:left; font-weight:600; color:var(--text-black); }
.btn-small { padding:0.45rem 0.65rem; font-size:0.9rem; border-radius:8px; }

/* CLS prevention — reserve space while JS populates; :empty auto-removes once content loads */
#home-calc-root:empty { min-height:340px; }
#product-list:empty { min-height:400px; }

@media (max-width:700px) {
  #home-calc-root:empty { min-height:420px; }
  #product-list:empty { min-height:600px; }
}

.products-section { margin:2rem 0 4rem; }
.product-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(260px,1fr)); gap:1rem; }
.product-card { background:linear-gradient(180deg, white, var(--luxury-white)); border:1px solid var(--premium-gray); padding:1rem; border-radius:8px; display:flex; flex-direction:column; gap:0.75rem; }
.product-card img { width:100%; height:180px; object-fit:cover; border-radius:6px; background:#efefef; aspect-ratio:13/9; }
.product-card h3 { margin:0; font-size:1.05rem; color:var(--text-black); }

/* remove link underline / blue line under titles in product cards */
.product-card a, .product-card a .card-link, .product-card .card-link { text-decoration: none; color: inherit; }
.product-card a h3 { text-decoration: none; border-bottom: none; display:block; }
.product-card a:focus, .product-card a:active { outline: none; }
.product-meta { color:var(--premium-dark-gray); font-size:0.9rem; }
.btn-primary { display:inline-block; padding:0.55rem 0.9rem; background:var(--accent); color:white; border-radius:6px; text-decoration:none; font-weight:700; border:none; cursor:pointer; }

/* Contain layout paint for below-fold sections to prevent CLS propagation */
.calculator-section { contain:layout style; }

.site-footer { border-top:1px solid var(--premium-dark-gray); padding:1.25rem 0; text-align:center; color:var(--premium-dark-gray); background:transparent; }

@media (max-width:600px) {
  .hero h1 { font-size:1.5rem; }
  #search-input { width:100%; }
}