:root {
  --brand: #0f3d63;
  --brand-dark: #0a2c48;
  --brand-soft: #e9f1f8;
  --accent: #f4713b;
  --accent-dark: #df5c27;
  --wa: #25d366;
  --wa-dark: #148c47;
  --ink: #16202b;
  --muted: #5c6b7a;
  --line: #dfe6ed;
  --surface: #f5f8fb;
  --white: #fff;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(15, 61, 99, .12);
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
button, input, select, textarea { font: inherit; }
:focus-visible { outline: 3px solid rgba(244, 113, 59, .45); outline-offset: 3px; }
.container { width: min(100% - 36px, var(--container)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 1000; background: #fff; padding: 10px 14px; border-radius: 8px; }
.skip-link:focus { top: 12px; }

.landing-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .96); border-bottom: 1px solid var(--line); backdrop-filter: blur(10px); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand-lockup { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--brand); font-weight: 800; line-height: 1.15; }
.brand-lockup img { width: 92px; height: auto; }
.brand-copy { display: none; }
.brand-copy small { display: block; color: var(--muted); font-size: .72rem; font-weight: 600; }
.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-switch { display: inline-flex; gap: 3px; padding: 3px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
.lang-switch a { padding: 5px 10px; border-radius: 999px; text-decoration: none; font-weight: 700; font-size: .8rem; }
.lang-switch .is-active { background: var(--brand); color: #fff; }
.btn.header-wa { display: none; }

.hero { color: #fff; background: linear-gradient(122deg, var(--brand-dark), var(--brand) 68%, #15517f); overflow: hidden; }
.hero-inner { display: grid; gap: 36px; padding-block: 54px 62px; }
.hero-copy { align-self: center; }
.hero h1 { max-width: 760px; margin: 0 0 20px; font-size: clamp(2.25rem, 7.2vw, 4.25rem); line-height: 1.05; letter-spacing: -.035em; }
.hero .lead { max-width: 690px; margin: 0; color: #dfeaf4; font-size: clamp(1.02rem, 2vw, 1.2rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.phone-line { margin: 22px 0 0; color: #dfeaf4; }
.phone-line a { color: #fff; font-weight: 800; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.btn { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; border: 0; border-radius: 10px; padding: 12px 18px; text-decoration: none; font-weight: 800; cursor: pointer; }
.btn-primary { color: #fff; background: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary { color: var(--brand); background: #fff; }
.btn-wa { color: #fff; background: var(--wa-dark); }
.btn-wa:hover { background: #0f753b; }
.btn-dark { color: #fff; background: var(--brand); }

.product-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; align-self: center; transform: rotate(-1deg); }
.product-wall figure { margin: 0; overflow: hidden; border-radius: 12px; background: #fff; box-shadow: 0 12px 28px rgba(0, 0, 0, .22); }
.product-wall figure:nth-child(2), .product-wall figure:nth-child(4), .product-wall figure:nth-child(5), .product-wall figure:nth-child(7) { transform: translateY(18px); }
.product-wall img { width: 100%; aspect-ratio: 1; object-fit: cover; }

.section { padding-block: 68px; }
.section-alt { background: var(--surface); }
.section-heading { max-width: 760px; margin-bottom: 30px; }
.section-heading h2 { margin: 0 0 12px; color: var(--brand-dark); font-size: clamp(1.9rem, 5.5vw, 3rem); line-height: 1.15; letter-spacing: -.025em; }
.section-heading p { margin: 0; color: var(--muted); font-size: 1.04rem; }

.product-grid { display: grid; gap: 18px; }
.product-card { display: flex; flex-direction: column; min-width: 0; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: 0 8px 26px rgba(15, 61, 99, .08); }
.product-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: var(--surface); }
.product-card-body { display: flex; flex: 1; flex-direction: column; padding: 20px; }
.product-card h3 { margin: 0 0 6px; color: var(--brand-dark); font-size: 1.2rem; line-height: 1.3; }
.product-card p { margin: 0 0 18px; color: var(--muted); }
.product-card .btn { align-self: stretch; margin-top: auto; background: var(--brand-soft); color: var(--brand); }
.product-card .btn:hover { color: #fff; background: var(--brand); }

.brief-band { color: #fff; background: var(--brand); }
.brief-band .section-heading h2, .brief-band .section-heading p { color: #fff; }
.brief-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; counter-reset: brief; }
.brief-list li { counter-increment: brief; display: grid; grid-template-columns: 42px 1fr; align-items: center; gap: 12px; padding: 15px; border: 1px solid rgba(255, 255, 255, .22); border-radius: 12px; background: rgba(255, 255, 255, .08); font-weight: 750; }
.brief-list li::before { content: counter(brief); width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; color: var(--brand-dark); background: #fff; font-weight: 900; }

.quality-layout { display: grid; gap: 34px; align-items: center; }
.quality-visual { min-height: 360px; display: grid; place-items: center; overflow: hidden; border-radius: 22px; background: linear-gradient(145deg, #dcecf2, #f7fbfd); box-shadow: var(--shadow); }
.quality-visual img { width: min(58%, 312px); height: auto; }
.quality-copy h2 { margin: 0 0 18px; color: var(--brand-dark); font-size: clamp(2rem, 5.5vw, 3.1rem); line-height: 1.12; }
.quality-copy p { margin: 0; color: var(--muted); font-size: 1.08rem; }
.quality-note { margin-top: 22px; padding: 18px 20px; border-left: 4px solid var(--accent); background: var(--surface); font-weight: 700; color: var(--brand-dark); }

.benefit-grid, .process-grid { display: grid; gap: 14px; }
.benefit { padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: #fff; color: var(--brand-dark); font-weight: 800; }
.benefit::before { content: "✓"; display: inline-grid; width: 28px; height: 28px; margin-right: 10px; place-items: center; border-radius: 50%; color: #fff; background: var(--brand); }
.process-card { position: relative; padding: 24px 20px 22px 70px; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.process-card b { position: absolute; left: 20px; top: 23px; width: 34px; height: 34px; display: grid; place-items: center; border-radius: 9px; color: #fff; background: var(--accent); }
.process-card h3 { margin: 0 0 5px; color: var(--brand-dark); font-size: 1.1rem; }
.process-card p { margin: 0; color: var(--muted); }

.quote-layout { display: grid; gap: 30px; align-items: start; }
.quote-intro { position: sticky; top: 104px; }
.quote-intro h2 { margin: 0 0 14px; color: var(--brand-dark); font-size: clamp(2rem, 5.5vw, 3.1rem); line-height: 1.12; }
.quote-intro p { color: var(--muted); }
.selected-product { display: none; margin-top: 18px; padding: 13px 15px; border-radius: 10px; background: var(--brand-soft); color: var(--brand); font-weight: 800; }
.selected-product.is-visible { display: block; }
.quote-form { display: grid; gap: 17px; padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: #fff; box-shadow: var(--shadow); }
.form-grid { display: grid; gap: 17px; }
.field label, .field legend { display: block; margin-bottom: 6px; color: var(--brand-dark); font-size: .9rem; font-weight: 800; }
.field input, .field select, .field textarea { width: 100%; min-height: 47px; border: 1px solid #cbd6e0; border-radius: 9px; padding: 10px 12px; color: var(--ink); background: #fff; }
.field textarea { min-height: 116px; resize: vertical; }
.field fieldset { margin: 0; padding: 0; border: 0; }
.radio-row { display: flex; gap: 20px; }
.radio-row label { display: inline-flex; align-items: center; gap: 8px; margin: 0; font-weight: 600; }
.radio-row input { width: 18px; min-height: 18px; }
.form-actions { display: grid; gap: 10px; }
.form-note { margin: 0; color: var(--muted); font-size: .82rem; }

.faq-list details { margin-bottom: 12px; overflow: hidden; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.faq-list summary { display: flex; justify-content: space-between; gap: 16px; padding: 18px 20px; color: var(--brand-dark); font-weight: 800; cursor: pointer; list-style: none; }
.faq-list summary::after { content: "+"; color: var(--accent); font-size: 1.35rem; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: 0; padding: 0 20px 20px; color: var(--muted); }

.final-cta { padding-block: 58px 92px; color: #fff; background: var(--brand-dark); text-align: center; }
.final-cta h2 { margin: 0 0 12px; font-size: clamp(2rem, 6vw, 3.2rem); line-height: 1.12; }
.final-cta p { max-width: 690px; margin: 0 auto 24px; color: #dce8f2; }
.site-footer { padding-block: 24px 92px; border-top: 1px solid rgba(255, 255, 255, .16); color: #cddbe7; background: var(--brand-dark); font-size: .9rem; text-align: center; }
.mobile-wa { position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 70; min-height: 52px; box-shadow: 0 10px 28px rgba(0, 0, 0, .25); }

@media (min-width: 640px) {
  .container { width: min(100% - 56px, var(--container)); }
  .brand-copy { display: block; }
  .btn.header-wa { display: inline-flex; min-height: 42px; padding: 9px 14px; }
  .hero-inner { padding-block: 70px 78px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .brief-list, .benefit-grid, .process-grid { grid-template-columns: repeat(2, 1fr); }
  .form-grid { grid-template-columns: repeat(2, 1fr); }
  .field-full { grid-column: 1 / -1; }
  .form-actions { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .hero-inner { grid-template-columns: 1.05fr .95fr; }
  .product-grid { grid-template-columns: repeat(4, 1fr); }
  .quality-layout { grid-template-columns: .9fr 1.1fr; }
  .quote-layout { grid-template-columns: .75fr 1.25fr; gap: 70px; }
  .process-grid { grid-template-columns: repeat(4, 1fr); }
  .mobile-wa { display: none; }
  .site-footer { padding-bottom: 24px; }
}

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