:root {
  --ink: #10283f;
  --ink-2: #173b58;
  --steel: #5e7080;
  --muted: #667684;
  --line: #dce2e6;
  --paper: #f4f1ea;
  --white: #fff;
  --orange: #f26a2e;
  --orange-dark: #d9541d;
  --yellow: #f4b942;
  --radius: 5px;
  --shadow: 0 18px 50px rgba(16, 40, 63, .12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif; line-height: 1.65; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.skip-link { position: fixed; left: 1rem; top: -4rem; z-index: 999; background: var(--orange); color: #fff; padding: .7rem 1rem; }
.skip-link:focus { top: 1rem; }
.section-inner, .header-inner, .hero-inner { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.section { padding: 104px 0; }
.eyebrow { margin: 0 0 14px; color: #dceaf3; font-size: 12px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow.dark { color: var(--orange-dark); }
.btn { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; padding: 0 22px; border: 1px solid transparent; border-radius: 3px; font-weight: 800; cursor: pointer; transition: transform .2s ease, background .2s ease, border-color .2s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: #fff; background: var(--orange); }
.btn-primary:hover { background: var(--orange-dark); }
.btn-ghost { color: #fff; border-color: rgba(255,255,255,.48); background: rgba(255,255,255,.06); backdrop-filter: blur(8px); }
.btn-ghost:hover { background: rgba(255,255,255,.14); }
.btn-outline { color: var(--ink); border-color: var(--ink); background: transparent; }
.btn-light { color: #fff; border-color: rgba(255,255,255,.4); }

.site-header { position: sticky; top: 0; z-index: 50; height: 78px; color: var(--ink); background: rgba(255,255,255,.94); border-bottom: 1px solid rgba(16,40,63,.1); backdrop-filter: blur(14px); }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 240px; }
.brand-mark { width: 38px; height: 38px; position: relative; display: flex; flex-direction: column; justify-content: center; gap: 4px; overflow: hidden; background: var(--ink); transform: skew(-10deg); }
.brand-mark i { display: block; height: 4px; margin: 0 7px; background: var(--orange); transform: skew(10deg); }
.brand strong, .brand small { display: block; line-height: 1.2; }
.brand strong { font-size: 19px; letter-spacing: .06em; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 10px; }
.desktop-nav { display: flex; align-items: center; gap: clamp(18px, 2vw, 32px); font-size: 14px; font-weight: 700; }
.desktop-nav a { position: relative; }
.desktop-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 2px; background: var(--orange); transition: right .2s; }
.desktop-nav a:hover::after { right: 0; }
.header-phone { text-align: right; line-height: 1.15; }
.header-phone span, .header-phone strong { display: block; }
.header-phone span { color: var(--muted); font-size: 10px; }
.header-phone strong { margin-top: 4px; font-size: 17px; letter-spacing: .03em; }

.hero { min-height: 680px; position: relative; display: flex; align-items: center; color: #fff; overflow: hidden; background: var(--ink); }
.hero-photo { position: absolute; inset: 0; background: url("assets/rockwool-production.jpg") center 42%/cover no-repeat; transform: scale(1.02); }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(8,24,38,.97) 0%, rgba(10,30,46,.88) 45%, rgba(10,30,46,.36) 100%), linear-gradient(0deg, rgba(5,15,24,.35), transparent 60%); }
.hero::after { content: ""; position: absolute; width: 43%; height: 8px; bottom: 0; left: 0; background: var(--orange); }
.hero-inner { position: relative; display: grid; grid-template-columns: minmax(0,1.3fr) minmax(300px,.7fr); align-items: end; gap: 72px; padding: 110px 0 88px; }
.hero-copy h1 { max-width: 760px; margin: 0; font-size: clamp(50px, 6vw, 82px); line-height: 1.08; letter-spacing: -.055em; }
.hero-copy h1 em { color: #fff; font-style: normal; text-decoration: underline; text-decoration-color: var(--orange); text-decoration-thickness: 7px; text-underline-offset: 9px; }
.hero-lead { max-width: 680px; margin: 32px 0 0; color: #e8eef2; font-size: 18px; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; }
.hero-note { margin: 22px 0 0; color: #b8c7d1; font-size: 13px; }
.hero-card { align-self: end; padding: 30px; background: rgba(255,255,255,.94); color: var(--ink); box-shadow: var(--shadow); border-top: 5px solid var(--orange); }
.card-kicker { margin: 0 0 22px; color: var(--muted); font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.capacity-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 22px 14px; }
.capacity-grid div { border-bottom: 1px solid var(--line); padding-bottom: 15px; }
.capacity-grid strong, .capacity-grid span { display: block; }
.capacity-grid strong { font-size: 30px; line-height: 1; letter-spacing: -.04em; }
.capacity-grid strong small { margin-left: 3px; font-size: 12px; letter-spacing: 0; }
.capacity-grid span { margin-top: 8px; color: var(--muted); font-size: 11px; }
.hero-card > a { display: inline-block; margin-top: 24px; color: var(--orange-dark); font-weight: 800; font-size: 13px; }

.trust-strip { background: var(--paper); border-bottom: 1px solid #e1ddd4; }
.trust-grid { display: grid; grid-template-columns: repeat(4,1fr); }
.trust-grid > div { display: flex; gap: 14px; padding: 28px 20px; border-right: 1px solid #ddd8ce; }
.trust-grid > div:first-child { padding-left: 0; }
.trust-grid > div:last-child { border-right: 0; }
.trust-grid span { color: var(--orange-dark); font-size: 11px; font-weight: 900; }
.trust-grid p { margin: 0; color: var(--muted); font-size: 12px; }
.trust-grid strong { display: block; margin-bottom: 3px; color: var(--ink); font-size: 15px; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 60px; margin-bottom: 48px; }
.section-heading h2, .specs-copy h2, .quote-intro h2, .faq-layout h2, .contact h2 { margin: 0; font-size: clamp(34px, 4vw, 54px); line-height: 1.16; letter-spacing: -.04em; }
.section-heading > p { max-width: 480px; margin: 0 0 6px; color: var(--muted); font-size: 15px; }
.section-heading.compact { margin-bottom: 36px; }
.product-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.product-card { position: relative; overflow: hidden; background: #fff; border: 1px solid var(--line); box-shadow: 0 9px 30px rgba(16,40,63,.06); }
.product-card > img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.product-content { padding: 30px; }
.product-index { color: var(--orange-dark); font-size: 11px; font-weight: 900; letter-spacing: .08em; }
.product-content h3 { margin: 7px 0 12px; font-size: 29px; line-height: 1.2; }
.product-content p { margin: 0; color: var(--muted); font-size: 14px; }
.product-content ul { display: grid; gap: 8px; margin: 22px 0 0; padding: 18px 0 0; border-top: 1px solid var(--line); list-style: none; font-size: 13px; font-weight: 700; }
.product-content li::before { content: "—"; margin-right: 8px; color: var(--orange); }
.accessory-row { display: grid; grid-template-columns: 140px 1fr auto; gap: 28px; align-items: center; margin-top: 24px; padding: 18px; background: var(--ink); color: #fff; }
.accessory-row img { width: 140px; height: 110px; object-fit: cover; }
.accessory-row span { color: var(--yellow); font-size: 11px; font-weight: 800; }
.accessory-row h3 { margin: 2px 0 5px; font-size: 22px; }
.accessory-row p { max-width: 660px; margin: 0; color: #c4d0d8; font-size: 13px; }
.accessory-row a { margin-right: 20px; color: var(--yellow); font-size: 13px; font-weight: 800; }

.specs-section { color: #fff; background: var(--ink); }
.specs-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 90px; }
.specs-copy > p:not(.eyebrow) { max-width: 520px; color: #b7c6d1; }
.specs-copy img { width: 100%; height: 310px; margin-top: 38px; object-fit: cover; object-position: center 40%; filter: saturate(.78); }
.spec-list { margin: 0; border-top: 1px solid rgba(255,255,255,.22); }
.spec-list div { display: grid; grid-template-columns: 140px 1fr; gap: 24px; padding: 21px 0; border-bottom: 1px solid rgba(255,255,255,.18); }
.spec-list dt { color: #92a6b5; font-size: 13px; }
.spec-list dd { margin: 0; font-size: 18px; font-weight: 800; }

.quote-section { background: var(--paper); }
.quote-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; align-items: start; }
.quote-intro > p:not(.eyebrow) { color: var(--muted); }
.quote-tip { display: grid; gap: 4px; margin-top: 28px; padding: 20px; border-left: 4px solid var(--orange); background: #fff; }
.quote-tip span { color: var(--muted); font-size: 13px; }
.quote-form { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; padding: 34px; background: #fff; box-shadow: var(--shadow); }
.quote-form label { color: var(--ink); font-size: 12px; font-weight: 800; }
.quote-form input, .quote-form select, .quote-form textarea { width: 100%; margin-top: 7px; padding: 13px 14px; color: var(--ink); background: #f7f8f8; border: 1px solid #d8dfe3; border-radius: 2px; outline: 0; }
.quote-form input:focus, .quote-form select:focus, .quote-form textarea:focus { border-color: var(--orange); box-shadow: 0 0 0 3px rgba(242,106,46,.12); }
.form-wide { grid-column: 1/-1; }
.form-actions { display: flex; gap: 10px; }
.quote-result { padding: 18px; background: #edf4f7; border: 1px solid #cbdce4; }
.quote-result p { margin: 0 0 12px; white-space: pre-line; font-size: 13px; }
.quote-result button { padding: 8px 13px; color: #fff; background: var(--ink); border: 0; cursor: pointer; }
.quote-result span { margin-left: 10px; color: var(--orange-dark); font-size: 12px; }

.process-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; padding: 0; background: var(--line); list-style: none; border: 1px solid var(--line); }
.process-grid li { min-height: 240px; padding: 32px 26px; background: #fff; }
.process-grid span { color: var(--orange); font-size: 11px; font-weight: 900; }
.process-grid h3 { margin: 45px 0 10px; font-size: 22px; }
.process-grid p { margin: 0; color: var(--muted); font-size: 13px; }

.cases { background: #f7f8f8; }
.case-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
.case-placeholder { min-height: 290px; display: flex; flex-direction: column; justify-content: end; padding: 26px; background: repeating-linear-gradient(135deg,#eef1f2,#eef1f2 14px,#e9edef 14px,#e9edef 28px); border: 1px dashed #a8b3ba; }
.case-placeholder span { margin-bottom: auto; color: var(--orange-dark); font-size: 11px; font-weight: 900; }
.case-placeholder strong { font-size: 25px; }
.case-placeholder p { margin: 6px 0 0; color: var(--muted); font-size: 12px; }

.faq-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 80px; align-items: start; }
.faq-layout > div:first-child > p:last-child { 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; padding: 22px 44px 22px 0; font-weight: 800; cursor: pointer; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 6px; top: 17px; color: var(--orange); font-size: 25px; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: -4px 44px 22px 0; color: var(--muted); font-size: 14px; }

.contact { padding: 92px 0; color: #fff; background: linear-gradient(120deg,#0d2336,#173d5b); }
.contact-layout { display: grid; grid-template-columns: 1.25fr .75fr; gap: 70px; align-items: center; }
.contact h2 em { color: var(--yellow); font-style: normal; }
.contact-layout > div:first-child > p:last-child { color: #b7c7d2; }
.contact-card { padding: 30px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.2); }
.contact-card > span { color: #aac0ce; font-size: 12px; }
.contact-card > a { display: block; margin: 5px 0 24px; font-size: clamp(30px,4vw,46px); font-weight: 900; line-height: 1.15; letter-spacing: -.04em; }
.contact-actions { display: flex; gap: 10px; }

footer { padding: 28px 0 100px; color: #9badb9; background: #081722; font-size: 11px; }
.footer-inner { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 30px; }
.footer-inner strong, .footer-inner span { display: block; }
.footer-inner strong { color: #fff; font-size: 15px; }
.footer-inner p { margin: 0; }
.mobile-actions { display: none; }

@media (max-width: 980px) {
  .desktop-nav { display: none; }
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-card { max-width: 500px; }
  .trust-grid { grid-template-columns: repeat(2,1fr); }
  .trust-grid > div:nth-child(2) { border-right: 0; }
  .specs-layout, .quote-layout, .faq-layout, .contact-layout { gap: 48px; }
  .product-grid { gap: 16px; }
}

@media (max-width: 760px) {
  body { padding-bottom: 66px; }
  .section-inner, .header-inner, .hero-inner { width: min(100% - 32px, 1180px); }
  .section { padding: 72px 0; }
  .site-header { height: 66px; }
  .brand { min-width: 0; }
  .brand-mark { width: 32px; height: 32px; }
  .brand strong { font-size: 16px; }
  .brand small { font-size: 8px; }
  .header-phone { display: none; }
  .hero { min-height: auto; }
  .hero-photo { background-position: 61% center; }
  .hero-overlay { background: linear-gradient(90deg,rgba(7,23,36,.96),rgba(7,23,36,.74)); }
  .hero-inner { padding: 82px 0 58px; }
  .hero-copy h1 { font-size: clamp(41px,12vw,58px); }
  .hero-copy h1 em { text-decoration-thickness: 5px; text-underline-offset: 7px; }
  .hero-lead { margin-top: 26px; font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-card { padding: 24px; }
  .capacity-grid strong { font-size: 27px; }
  .trust-grid { grid-template-columns: 1fr; }
  .trust-grid > div { padding: 18px 0; border-right: 0; border-bottom: 1px solid #ddd8ce; }
  .trust-grid > div:last-child { border-bottom: 0; }
  .section-heading { display: block; margin-bottom: 32px; }
  .section-heading > p { margin-top: 16px; }
  .product-grid, .specs-layout, .quote-layout, .process-grid, .case-grid, .faq-layout, .contact-layout { grid-template-columns: 1fr; }
  .product-content { padding: 24px; }
  .accessory-row { grid-template-columns: 90px 1fr; gap: 16px; }
  .accessory-row img { width: 90px; height: 100%; min-height: 110px; }
  .accessory-row a { grid-column: 1/-1; padding: 10px 0 2px; border-top: 1px solid rgba(255,255,255,.16); }
  .specs-layout { gap: 44px; }
  .specs-copy img { height: 240px; }
  .spec-list div { grid-template-columns: 110px 1fr; gap: 14px; }
  .spec-list dd { font-size: 15px; }
  .quote-form { grid-template-columns: 1fr; padding: 22px 18px; }
  .form-wide { grid-column: auto; }
  .form-actions { flex-direction: column; }
  .process-grid { gap: 0; }
  .process-grid li { min-height: 180px; border-bottom: 1px solid var(--line); }
  .process-grid h3 { margin-top: 28px; }
  .case-placeholder { min-height: 240px; }
  .contact-card { padding: 24px 20px; }
  .contact-actions { flex-direction: column; }
  .footer-inner { grid-template-columns: 1fr; gap: 14px; }
  footer { padding-bottom: 30px; }
  .mobile-actions { position: fixed; z-index: 60; left: 0; right: 0; bottom: 0; height: 66px; display: grid; grid-template-columns: 1.25fr .75fr; background: #fff; box-shadow: 0 -8px 30px rgba(16,40,63,.15); }
  .mobile-actions a { display: flex; flex-direction: column; align-items: center; justify-content: center; line-height: 1.1; }
  .mobile-actions a:first-child { color: #fff; background: var(--ink); }
  .mobile-actions a:last-child { color: #fff; background: var(--orange); font-weight: 900; }
  .mobile-actions span { font-size: 9px; opacity: .75; }
  .mobile-actions strong { margin-top: 4px; font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}