:root {
  --red: #c91432;
  --red-dark: #991026;
  --ink: #24252a;
  --muted: #676b73;
  --paper: #f7f7f5;
  --line: #e4e4e0;
  --white: #fff;
  --yellow: #f5b800;
  --green: #128c4e;
  --shadow: 0 18px 50px rgba(26,27,30,.1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, system-ui, sans-serif; line-height: 1.58; }
img { display: block; max-width: 100%; }
a { color: inherit; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.topbar { color: #fff; background: var(--ink); font-size: .86rem; }
.topbar .container { min-height: 40px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.topbar span { color: #d4d5d8; }
.topbar a { color: #fff; text-decoration: none; font-weight: 800; }
.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid rgba(0,0,0,.07); background: rgba(255,255,255,.95); backdrop-filter: blur(12px); }
.nav { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 14px; color: #fff; background: var(--red); box-shadow: 0 9px 24px rgba(201,20,50,.22); font: 800 1.35rem/1 Archivo, sans-serif; letter-spacing: -.08em; }
.brand-mark { font-size: 0; }
.brand-mark::before { content: "3I"; font: 800 1.35rem/1 Archivo, sans-serif; letter-spacing: -.08em; }
.brand-copy strong { display: block; color: var(--red); font: 800 1.32rem/1 Archivo, sans-serif; letter-spacing: -.05em; }
.brand-copy small { display: block; margin-top: 5px; color: var(--ink); font: 700 .61rem/1 Archivo, sans-serif; letter-spacing: .16em; }
.nav-actions { display: flex; align-items: center; gap: 18px; }
.nav-actions > a:first-child { font-weight: 800; text-decoration: none; }
.btn { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 0 22px; border-radius: 13px; border: 0; text-decoration: none; font-weight: 800; transition: transform .2s ease, background .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-red { color: #fff; background: var(--red); }
.btn-red:hover { background: var(--red-dark); }
.btn-green { color: #fff; background: var(--green); }
.btn-dark { color: #fff; background: var(--ink); }
.breadcrumb { padding: 25px 0 0; color: var(--muted); font-size: .86rem; }
.breadcrumb a { color: var(--red); text-decoration: none; font-weight: 800; }
.product-hero { padding: 48px 0 72px; }
.product-layout { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(290px, .65fr); align-items: start; gap: 34px; }
.product-main h1 { max-width: 770px; margin: 0 0 18px; font: 800 clamp(2.5rem, 5vw, 4.5rem)/.98 Archivo, sans-serif; letter-spacing: -.055em; }
.lead { max-width: 790px; margin: 0 0 28px; color: var(--muted); font-size: 1.07rem; }
.product-photo { min-height: 490px; display: grid; place-items: center; overflow: hidden; padding: clamp(24px, 5vw, 54px); border: 1px solid var(--line); border-radius: 26px; background: #fff; box-shadow: var(--shadow); }
.product-photo img { width: 100%; height: 430px; object-fit: contain; }
.product-sidebar { position: sticky; top: 105px; display: grid; gap: 16px; }
.quote-card { padding: 28px; border-radius: 22px; color: #fff; background: var(--ink); box-shadow: var(--shadow); }
.quote-card h2 { margin: 0 0 10px; font: 700 1.45rem Archivo, sans-serif; }
.detail-unit-price { margin: 0 0 12px; color: #fff; font: 800 1.75rem/1.2 Archivo, sans-serif; }
.detail-unit-price small { display: block; margin-top: 4px; color: #d2d3d6; font: 600 .88rem/1.4 Inter, system-ui, sans-serif; }
.quote-card p { margin: 0 0 20px; color: #d2d3d6; }
.quote-card .btn { width: 100%; }
.spec-card { padding: 25px; border: 1px solid var(--line); border-radius: 20px; background: #fff; }
.spec-card h3 { margin: 0 0 15px; font: 700 1.05rem Archivo, sans-serif; }
.spec-list { display: grid; gap: 11px; margin: 0; padding: 0; list-style: none; color: var(--muted); font-size: .92rem; }
.spec-list li { padding: 0 0 10px 20px; border-bottom: 1px solid var(--line); position: relative; }
.spec-list li:last-child { border-bottom: 0; padding-bottom: 0; }
.spec-list li::before { content: ""; position: absolute; left: 0; top: .55em; width: 8px; height: 8px; border-radius: 50%; background: var(--red); }
.content-section { padding: 0 0 78px; }
.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.content-card { padding: clamp(28px, 4vw, 42px); border: 1px solid var(--line); border-radius: 22px; background: #fff; }
.content-card h2 { margin: 0 0 14px; font: 700 clamp(1.5rem, 3vw, 2.15rem)/1.08 Archivo, sans-serif; letter-spacing: -.035em; }
.content-card p { margin: 0; color: var(--muted); }
.content-card ul { margin: 16px 0 0; padding-left: 20px; color: var(--muted); }
.attention { border-color: #f0d88a; background: #fffaf0; }
.order-strip { padding: 0; color: #fff; background: var(--red); }
.order-grid { min-height: 220px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 40px; padding: 42px 0; }
.order-grid h2 { margin: 0 0 12px; font: 800 clamp(2rem, 4vw, 3.2rem)/1 Archivo, sans-serif; letter-spacing: -.05em; }
.order-grid p { max-width: 700px; margin: 0; color: #ffe6eb; }
.related { padding: 72px 0; }
.related h2 { margin: 0 0 22px; font: 700 1.75rem Archivo, sans-serif; }
.related-links { display: flex; flex-wrap: wrap; gap: 10px; }
.related-links a { padding: 11px 15px; border: 1px solid var(--line); border-radius: 11px; background: #fff; text-decoration: none; font-weight: 800; }
.related-links a:hover { color: var(--red); border-color: var(--red); }
footer { padding: 46px 0 96px; color: #fff; background: #1c1d21; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; }
footer .brand-copy small { color: #fff; }
footer p, footer span { color: #b7b9be; }
.footer-links { display: grid; gap: 9px; }
.footer-links a { color: #d0d1d4; text-decoration: none; }
.copyright { margin-top: 35px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); color: #8f9298; font-size: .83rem; }
.whatsapp-chat { position: fixed; right: 22px; bottom: 22px; z-index: 35; min-height: 58px; display: flex; align-items: center; gap: 10px; padding: 0 19px; border-radius: 999px; color: #fff; background: var(--green); box-shadow: 0 16px 38px rgba(0,0,0,.24); text-decoration: none; font-weight: 800; }
.whatsapp-chat > img { width: 25px; height: 25px; display: block; flex: 0 0 auto; }
.whatsapp-chat small { display: block; font-weight: 500; opacity: .9; }
@media (max-width: 850px) {
  .product-layout, .content-grid { grid-template-columns: 1fr; }
  .product-sidebar { position: static; grid-template-columns: 1fr 1fr; }
  .product-photo { min-height: 420px; }
}
@media (max-width: 620px) {
  .container { width: min(100% - 28px, 1120px); }
  .topbar span, .nav-actions > a:first-child, .nav-actions .btn { display: none; }
  .topbar .container { min-height: 42px; justify-content: center; }
  .nav { min-height: 70px; }
  .brand-mark { width: 42px; height: 42px; }
  .brand-copy strong { font-size: 1.18rem; }
  .product-hero { padding-top: 34px; }
  .product-sidebar { grid-template-columns: 1fr; }
  .product-photo { min-height: 340px; padding: 18px; border-radius: 20px; }
  .product-photo img { height: 300px; }
  .order-grid, .footer-grid { grid-template-columns: 1fr; }
  .order-grid { gap: 24px; }
  .order-grid .btn { width: 100%; }
  footer { padding-bottom: 104px; }
  .whatsapp-chat { left: 14px; right: 14px; bottom: 14px; justify-content: center; border-radius: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}