:root {
  --ink: #17191c;
  --muted: #656b72;
  --line: #dfe2e5;
  --soft: #f4f5f5;
  --white: #ffffff;
  --orange: #ef5b2a;
  --orange-dark: #c83f16;
  --green: #16834a;
  --shadow: 0 18px 55px rgba(20, 24, 28, .13);
  --container: 1220px;
  --header: 82px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header); }
body { margin: 0; color: var(--ink); background: var(--white); font-family: Arial, Helvetica, sans-serif; font-size: 16px; line-height: 1.65; letter-spacing: 0; }
body.nav-open { overflow: hidden; }
img, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; letter-spacing: 0; }
button { color: inherit; }
.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 2000; left: 16px; top: -100px; padding: 10px 16px; background: var(--ink); color: white; }
.skip-link:focus { top: 12px; }

.site-header { position: fixed; inset: 0 0 auto; z-index: 1000; height: var(--header); color: white; transition: background .3s ease, box-shadow .3s ease, color .3s ease; }
.site-header.is-scrolled, .site-header.nav-active { color: var(--ink); background: rgba(255,255,255,.97); box-shadow: 0 5px 24px rgba(0,0,0,.09); backdrop-filter: blur(12px); }
.header-inner { width: min(calc(100% - 48px), 1380px); height: 100%; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.brand { display: flex; width: 156px; height: 52px; align-items: center; overflow: hidden; }
.brand img { width: 156px; height: auto; }
.site-header:not(.is-scrolled):not(.nav-active) .brand { background: white; padding: 6px 10px; }
.site-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; font-weight: 700; }
.site-nav > a { position: relative; white-space: nowrap; }
.site-nav > a:not(.nav-contact)::after { content: ""; position: absolute; height: 2px; left: 0; right: 100%; bottom: -8px; background: var(--orange); transition: right .25s ease; }
.site-nav > a:hover::after, .site-nav > a.is-active::after { right: 0; }
.nav-contact { padding: 12px 18px; background: var(--orange); color: white; }
.nav-contact:hover { background: var(--orange-dark); }
.menu-toggle { display: none; width: 44px; height: 44px; border: 0; background: transparent; padding: 11px 8px; cursor: pointer; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: currentColor; transition: transform .25s, opacity .25s; }

.hero { position: relative; height: clamp(650px, 90svh, 900px); min-height: 650px; overflow: hidden; background: #222; }
.hero-slide { position: absolute; inset: 0; opacity: 0; visibility: hidden; transition: opacity .75s ease, visibility .75s; }
.hero-slide.is-active { opacity: 1; visibility: visible; }
.hero-slide > img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.025); transition: transform 6s linear; }
.hero-slide.is-active > img { transform: scale(1); }
.hero-slide:first-child > img { object-position: center 55%; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(12,15,17,.88) 0%, rgba(12,15,17,.58) 44%, rgba(12,15,17,.12) 75%); }
.hero-content { position: relative; z-index: 2; height: 100%; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; padding-top: var(--header); color: white; }
.hero-content h1, .hero-content h2 { max-width: 790px; margin: 0 0 24px; font-size: clamp(44px, 5.3vw, 76px); line-height: 1.04; font-weight: 800; letter-spacing: 0; }
.hero-content p { max-width: 670px; margin: 0 0 34px; color: rgba(255,255,255,.86); font-size: 20px; line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; gap: 18px; padding: 13px 22px; border: 1px solid transparent; border-radius: 2px; font-weight: 700; cursor: pointer; transition: background .25s, border-color .25s, color .25s, transform .25s; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--orange); color: white; }
.button-primary:hover { background: var(--orange-dark); }
.button-ghost { border-color: rgba(255,255,255,.7); color: white; }
.button-ghost:hover { background: white; color: var(--ink); }
.button-dark { background: var(--ink); color: white; }
.button-dark:hover { background: var(--orange); }
.hero-controls { position: absolute; z-index: 3; right: max(24px, calc((100vw - var(--container))/2)); bottom: 38px; display: flex; align-items: center; gap: 16px; color: white; }
.hero-arrow { width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.5); background: rgba(0,0,0,.18); cursor: pointer; }
.hero-arrow:hover { background: var(--orange); border-color: var(--orange); }
.hero-dots { display: flex; gap: 8px; }
.hero-dots button { width: 26px; height: 3px; padding: 0; border: 0; background: rgba(255,255,255,.45); cursor: pointer; }
.hero-dots button.is-active { background: var(--orange); }

.capability-strip { position: relative; z-index: 5; margin-top: -1px; color: white; background: var(--ink); }
.capability-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.capability-grid > div { min-height: 118px; display: flex; flex-direction: column; justify-content: center; padding: 22px 34px; border-right: 1px solid rgba(255,255,255,.15); }
.capability-grid > div:first-child { border-left: 1px solid rgba(255,255,255,.15); }
.capability-grid strong { color: var(--orange); font-size: 24px; line-height: 1.2; }
.capability-grid span { margin-top: 6px; color: #bdc1c5; font-size: 13px; }

.section { padding: 112px 0; }
.section-index { margin: 0 0 16px; color: var(--orange-dark); font-size: 13px; font-weight: 800; text-transform: uppercase; }
.section h2 { margin: 0 0 24px; font-size: clamp(34px, 4vw, 54px); line-height: 1.13; letter-spacing: 0; }
.section h3 { line-height: 1.25; }
.lead { color: #30343a; font-size: 20px; line-height: 1.65; }
.section-copy > p:not(.section-index), .section-heading > p:not(.section-index) { color: var(--muted); }
.section-heading { max-width: 820px; margin-bottom: 55px; }
.section-heading > p:last-child { max-width: 720px; margin-bottom: 0; }
.text-link { display: inline-flex; gap: 16px; align-items: center; margin-top: 16px; color: var(--orange-dark); font-weight: 800; border-bottom: 1px solid currentColor; }

.split-intro { display: grid; grid-template-columns: .85fr 1.15fr; gap: 82px; align-items: center; }
.product-stage { margin: 0; background: var(--soft); box-shadow: var(--shadow); }
.product-stage img { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.product-stage figcaption { padding: 16px 20px; color: var(--muted); font-size: 13px; }

.principle-section { background: var(--soft); }
.process-flow { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid #cfd3d6; border-bottom: 1px solid #cfd3d6; }
.process-step { padding: 42px 28px 38px; border-left: 1px solid #cfd3d6; }
.process-step:last-child { border-right: 1px solid #cfd3d6; }
.process-number { display: block; margin-bottom: 55px; color: var(--orange); font-weight: 800; }
.process-step h3 { margin: 0 0 14px; font-size: 24px; }
.process-step p { margin: 0; color: var(--muted); font-size: 14px; }

.advantages-layout { display: grid; grid-template-columns: .95fr 1.05fr; gap: 86px; align-items: center; }
.advantages-image { height: 760px; box-shadow: var(--shadow); }
.advantages-image img { width: 100%; height: 100%; object-fit: cover; }
.advantages-content .section-heading { margin-bottom: 18px; }
.feature-row { display: grid; grid-template-columns: 44px 1fr; gap: 20px; padding: 21px 0; border-top: 1px solid var(--line); }
.feature-row > span { color: var(--orange); font-weight: 800; }
.feature-row h3 { margin: 0 0 8px; font-size: 19px; }
.feature-row p { margin: 0; color: var(--muted); font-size: 14px; }

.applications-section { color: white; background: #1c2023; }
.section-heading.light > p { color: #b9bec2; }
.application-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: #44494d; }
.application-item { position: relative; min-height: 390px; overflow: hidden; background: #25292c; }
.application-item img { width: 100%; height: 100%; object-fit: cover; opacity: .7; transition: transform .45s, opacity .45s; }
.application-item::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(10,12,13,.92), rgba(10,12,13,0) 70%); }
.application-item > div { position: absolute; z-index: 2; left: 28px; right: 28px; bottom: 25px; }
.application-item span { color: #ff956e; font-size: 12px; font-weight: 800; text-transform: uppercase; }
.application-item h3 { margin: 5px 0 6px; font-size: 23px; }
.application-item p { max-height: 0; margin: 0; overflow: hidden; opacity: 0; color: #c7cacc; font-size: 14px; transition: max-height .35s, opacity .35s; }
.application-item:hover img { transform: scale(1.045); opacity: .86; }
.application-item:hover p { max-height: 80px; opacity: 1; }

.models-section { background: var(--soft); }
.table-wrap { overflow-x: auto; background: white; box-shadow: 0 10px 35px rgba(20,24,28,.08); }
table { width: 100%; min-width: 900px; border-collapse: collapse; }
th, td { padding: 21px 20px; text-align: left; border-bottom: 1px solid var(--line); }
thead th { background: var(--ink); color: white; font-size: 12px; text-transform: uppercase; }
tbody th { color: var(--orange-dark); }
tbody tr:hover { background: #fff8f4; }
.model-options { display: grid; grid-template-columns: repeat(3,1fr) auto; align-items: stretch; margin-top: 28px; }
.model-options > div { display: flex; flex-direction: column; justify-content: center; min-height: 78px; padding: 12px 22px; background: white; border-right: 1px solid var(--line); }
.model-options span { color: var(--muted); font-size: 12px; }
.model-options .button { border-radius: 0; }

.video-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.video-frame { position: relative; margin: 0; background: #121416; box-shadow: var(--shadow); overflow: hidden; }
.video-frame video { width: 100%; aspect-ratio: 16/9; object-fit: cover; background: black; }
.video-watermark { position: absolute; top: 18px; right: 18px; width: 125px; height: auto; padding: 5px 8px; background: rgba(255,255,255,.82); opacity: .85; pointer-events: none; }
.video-frame figcaption { display: flex; justify-content: space-between; gap: 20px; padding: 18px 20px; color: white; }
.video-frame figcaption span { color: #aeb3b7; font-size: 13px; }

.cases-section { background: var(--soft); }
.case-gallery { display: grid; grid-template-columns: 1.4fr .8fr; grid-template-rows: 1fr 1fr; gap: 24px; }
.case-feature { grid-row: 1 / 3; position: relative; min-height: 660px; overflow: hidden; margin: 0; }
.case-small { position: relative; min-height: 318px; overflow: hidden; margin: 0; }
.case-gallery img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.case-gallery article::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(12,14,15,.88), transparent 70%); }
.case-gallery article > div { position: absolute; z-index: 2; left: 30px; right: 30px; bottom: 28px; color: white; }
.case-gallery span { color: #ff9b75; font-size: 12px; font-weight: 800; text-transform: uppercase; }
.case-gallery h3 { margin: 6px 0; font-size: 25px; }
.case-gallery p { max-width: 560px; color: #d7d9db; }
.case-gallery article:hover img { transform: scale(1.035); }

.company-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 78px; align-items: center; }
.company-story > p:not(.section-index) { color: var(--muted); }
.company-facts { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 38px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.company-facts div { padding: 22px 18px 22px 0; }
.company-facts strong { display: block; color: var(--orange-dark); font-size: 27px; }
.company-facts span { color: var(--muted); font-size: 12px; }
.company-visual { display: grid; gap: 18px; }
.company-main { width: 100%; aspect-ratio: 1.45/1; object-fit: cover; box-shadow: var(--shadow); }
.company-secondary { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.company-secondary img { width: 100%; aspect-ratio: 1.45/1; object-fit: cover; }

.certificates-section { background: #eff1f2; }
.certificate-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; align-items: stretch; }
.certificate-grid figure { margin: 0; padding: 18px; background: white; box-shadow: 0 8px 26px rgba(20,24,28,.07); }
.certificate-grid img { width: 100%; height: 310px; object-fit: contain; background: #f6f6f6; }
.certificate-grid figcaption { padding-top: 15px; font-weight: 800; }
.certificate-note { margin: 24px 0 0; color: var(--muted); font-size: 13px; }

.faq-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 90px; align-items: start; }
.faq-intro { position: sticky; top: calc(var(--header) + 30px); }
.faq-intro > p:not(.section-index) { color: var(--muted); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 25px 48px 25px 0; font-weight: 800; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span::before, .faq-list summary span::after { content: ""; position: absolute; right: 8px; top: 50%; width: 16px; height: 2px; background: var(--orange); transition: transform .25s; }
.faq-list summary span::after { transform: rotate(90deg); }
.faq-list details[open] summary span::after { transform: rotate(0); }
.faq-list details p { margin: -4px 52px 24px 0; color: var(--muted); }

.contact-section { padding: 112px 0; color: white; background: #17191c; }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; }
.contact-copy h2 { margin: 0 0 24px; font-size: clamp(38px, 4vw, 58px); line-height: 1.1; }
.contact-copy > p:not(.section-index) { color: #b6bbc0; }
.contact-details { margin-top: 45px; border-top: 1px solid #3b3f43; }
.contact-details > * { display: flex; flex-direction: column; padding: 16px 0; border-bottom: 1px solid #3b3f43; }
.contact-details span { color: #8c9298; font-size: 12px; text-transform: uppercase; }
.contact-details strong { margin-top: 4px; font-size: 15px; }
.inquiry-form { padding: 42px; color: var(--ink); background: white; box-shadow: var(--shadow); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.inquiry-form label { display: block; margin-bottom: 17px; font-size: 13px; font-weight: 800; }
.inquiry-form input, .inquiry-form select, .inquiry-form textarea { width: 100%; margin-top: 7px; padding: 13px 14px; color: var(--ink); background: #f7f7f7; border: 1px solid #d5d8da; border-radius: 0; outline: none; }
.inquiry-form input:focus, .inquiry-form select:focus, .inquiry-form textarea:focus { border-color: var(--orange); box-shadow: 0 0 0 3px rgba(239,91,42,.12); }
.inquiry-form textarea { resize: vertical; min-height: 135px; }
.form-submit { width: 100%; border: 0; }
.form-note { margin: 12px 0 0; color: var(--muted); font-size: 12px; text-align: center; }

.site-footer { color: #c3c7ca; background: #0f1113; }
.footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 55px; padding-top: 72px; padding-bottom: 62px; }
.footer-brand img { width: 160px; padding: 6px 10px; background: white; }
.footer-brand p { max-width: 320px; color: #8f959a; }
.site-footer h2 { margin: 0 0 18px; color: white; font-size: 15px; }
.footer-links, .footer-contact { display: flex; flex-direction: column; gap: 10px; }
.footer-links a, .footer-contact a { font-size: 13px; }
.footer-links a:hover, .footer-contact a:hover { color: var(--orange); }
.footer-contact p { margin: 0; font-size: 13px; }
.footer-bottom { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 30px; border-top: 1px solid #2c2f32; color: #747a7f; font-size: 12px; }
.footer-bottom div { display: flex; gap: 20px; }

.whatsapp-float { position: fixed; z-index: 900; right: 24px; bottom: 24px; display: flex; align-items: center; gap: 9px; min-height: 52px; padding: 7px 16px 7px 8px; color: white; background: var(--green); border-radius: 28px; box-shadow: 0 10px 28px rgba(0,0,0,.25); transition: transform .25s, background .25s; }
.whatsapp-float:hover { background: #0d6c3b; transform: translateY(-3px); }
.whatsapp-float span { width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.6); border-radius: 50%; font-size: 20px; }
.whatsapp-float b { font-size: 13px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1100px) {
  .site-nav { gap: 19px; }
  .split-intro, .advantages-layout, .company-grid { gap: 45px; }
  .process-step { padding-inline: 20px; }
  .advantages-image { height: 650px; }
  .model-options { grid-template-columns: repeat(3,1fr); }
  .model-options .button { grid-column: 1 / -1; }
  .faq-layout, .contact-grid { gap: 55px; }
  .footer-main { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-contact { grid-column: 2 / 4; flex-direction: row; flex-wrap: wrap; }
  .footer-contact h2 { width: 100%; }
}

@media (max-width: 900px) {
  :root { --header: 72px; }
  .container, .header-inner { width: min(calc(100% - 36px), var(--container)); }
  .menu-toggle { display: block; position: relative; z-index: 3; }
  .site-nav { position: fixed; inset: 0; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; gap: 20px; padding: 90px 10vw; color: var(--ink); background: white; transform: translateX(100%); transition: transform .3s ease; }
  .site-nav.is-open { transform: translateX(0); }
  .site-nav a { font-size: 24px; }
  .nav-contact { margin-top: 10px; font-size: 16px !important; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .hero { height: 84svh; min-height: 600px; }
  .hero-content h1, .hero-content h2 { font-size: clamp(40px, 8vw, 62px); }
  .capability-grid { grid-template-columns: 1fr 1fr; }
  .capability-grid > div:nth-child(3) { border-left: 1px solid rgba(255,255,255,.15); }
  .split-intro, .advantages-layout, .company-grid, .faq-layout, .contact-grid { grid-template-columns: 1fr; }
  .product-stage { order: -1; }
  .process-flow { grid-template-columns: 1fr 1fr; }
  .process-step:nth-child(3) { border-top: 1px solid #cfd3d6; }
  .process-step:nth-child(4) { border-top: 1px solid #cfd3d6; border-right: 1px solid #cfd3d6; }
  .advantages-image { height: 540px; }
  .application-grid { grid-template-columns: 1fr 1fr; }
  .application-item p { max-height: 90px; opacity: 1; }
  .certificate-grid { grid-template-columns: 1fr 1fr; }
  .faq-intro { position: static; }
}

@media (max-width: 640px) {
  .container, .header-inner { width: min(calc(100% - 28px), var(--container)); }
  .brand, .brand img { width: 138px; }
  .section, .contact-section { padding: 78px 0; }
  .hero { height: 82svh; min-height: 560px; }
  .hero-content { justify-content: flex-end; padding-bottom: 110px; }
  .hero-content h1, .hero-content h2 { margin-bottom: 16px; font-size: 38px; }
  .hero-content p { margin-bottom: 24px; font-size: 16px; }
  .hero-actions .button { width: 100%; }
  .hero-controls { right: 18px; bottom: 24px; }
  .hero-shade { background: linear-gradient(0deg, rgba(12,15,17,.94) 0%, rgba(12,15,17,.52) 70%, rgba(12,15,17,.25)); }
  .capability-grid > div { min-height: 96px; padding: 16px 14px; }
  .capability-grid strong { font-size: 20px; }
  .section h2 { font-size: 34px; }
  .section-heading { margin-bottom: 38px; }
  .split-intro, .advantages-layout, .company-grid, .faq-layout, .contact-grid { gap: 40px; }
  .lead { font-size: 18px; }
  .process-flow { grid-template-columns: 1fr; }
  .process-step, .process-step:nth-child(2) { border-right: 1px solid #cfd3d6; border-top: 1px solid #cfd3d6; }
  .process-step:first-child { border-top: 0; }
  .process-number { margin-bottom: 20px; }
  .advantages-image { height: 390px; }
  .application-grid, .video-grid, .certificate-grid { grid-template-columns: 1fr; }
  .application-item { min-height: 350px; }
  .model-options { grid-template-columns: 1fr; }
  .model-options .button { grid-column: auto; }
  .video-frame figcaption { flex-direction: column; gap: 4px; }
  .case-gallery { grid-template-columns: 1fr; grid-template-rows: auto; }
  .case-feature { grid-row: auto; min-height: 500px; }
  .case-small { min-height: 290px; }
  .company-facts { grid-template-columns: 1fr; }
  .company-facts div { border-bottom: 1px solid var(--line); }
  .company-facts div:last-child { border-bottom: 0; }
  .certificate-grid img { height: 330px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .inquiry-form { padding: 28px 20px; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 38px 24px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; flex-direction: column; }
  .footer-bottom { align-items: flex-start; flex-direction: column; justify-content: center; padding: 18px 0; }
  .footer-bottom p { margin: 0; }
  .whatsapp-float { right: 14px; bottom: 14px; width: 52px; padding: 7px; }
  .whatsapp-float b { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}