/* Reading rhythm and responsive refinements shared by the five pages. */
html { scroll-padding-top: 116px; }
body { line-height: 1.9; }
h1, h2, h3 { letter-spacing: 0; line-height: 1.5; text-wrap: balance; }
h2 { font-size: 38px; }
h3 { font-size: 22px; }
.title-line { display: block; }
.title-phrase { display: inline-block; max-width: 100%; }
.header-inner { min-height: 96px; }
.brand-mark { width: 48px; height: 48px; }
.brand-name { font-size: 28px; }
.brand-sub { font-size: 11px; letter-spacing: 0; }
.nav a { padding-block: 30px; font-size: 15px; font-weight: 700; }
.nav a[aria-current=page]:after { bottom: 20px; }
.header-contact { font-size: 15px; padding: 12px 20px; }
.section { padding-block: 80px; }
.eyebrow { font-size: 14px; margin-bottom: 24px; line-height: 1.8; }
.section-heading { margin-bottom: 40px; }
.section-heading .eyebrow { margin-bottom: 20px; }
.content-lead { max-width: 34em; font-size: 18px; line-height: 1.95; margin-top: 24px; }
.hero-content { padding-top: 88px; padding-bottom: 104px; }
.hero-content .eyebrow { font-size: 16px; margin-bottom: 24px; }
.hero-content h1 { font-size: 56px; line-height: 1.5; letter-spacing: 0; }
.hero-content p { font-size: 19px; line-height: 1.9; margin-top: 24px; max-width: 580px; }
.hero-content .button-row { margin-top: 32px; gap: 16px; }
.hero-content .button { font-size: 17px; min-height: 54px; padding: 14px 22px; }
.hero-content .button.ghost-light { background: #103d30e6; }
.hero-content .button.ghost-light:hover { background: #245540; }
.hero-slides { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.hero-slides::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(90deg, #103d30d1 0%, #103d30b8 45%, #103d3026 72%, transparent 100%); }
.hero-slide { position: absolute; inset: 0; visibility: hidden; transform: translateX(100%); }
.hero-slide.is-active { visibility: visible; transform: translateX(0); }
.hero-slide.is-staged { visibility: visible; transform: translateX(100%); }
.hero-slide.is-leaving { visibility: visible; transform: translateX(-100%); }
.is-sliding .hero-slide { transition: transform 600ms ease; }
.hero-slide .hero-background { z-index: 0; }
.hero-controls { position: absolute; inset-inline: 0; bottom: 18px; display: flex; justify-content: flex-end; pointer-events: none; }
.hero-control-bar { display: inline-flex; align-items: center; padding-inline: 4px; border: 1px solid #ced9cf80; border-radius: 5px; background: #103d30ed; pointer-events: auto; }
.hero-dots { display: flex; }
.hero-dot, .hero-toggle { display: inline-flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; padding: 10px; border: 0; background: transparent; color: #f6f5ef; touch-action: manipulation; }
.hero-dot span { width: 8px; height: 8px; border-radius: 8px; background: #f6f5ef80; }
.hero-dot[aria-current="true"] span { width: 22px; background: #f6f5ef; }
.hero-toggle { font-size: 13px; border-left: 1px solid #ced9cf60; padding-inline: 14px; }
.hero-dot:focus-visible, .hero-toggle:focus-visible { outline: 2px solid #f6f5ef; outline-offset: -4px; }
.no-js .hero-controls { display: none; }
@media (max-width: 800px) { .hero-slide:nth-child(2) .hero-background { object-position: 78% center; } }
@media (prefers-reduced-motion: reduce) { .is-sliding .hero-slide { transition: none; } }
.product-overview { padding-block: 72px; }
.product-overview h2 { font-size: 38px; }
.product-overview .content-lead { font-size: 18px; }
.product-grid { gap: 64px; }
.spec-row, .product-overview .spec-row { font-size: 16px; line-height: 1.9; padding-block: 22px; grid-template-columns: 100px 1fr; gap: 20px; }
.spec-row dd { padding-left: 20px; }
.base-strengths { padding-block: 80px; }
.base-strengths h2 { font-size: 38px; line-height: 1.55; }
.base-strengths .eyebrow { font-size: 14px; }
.base-strengths .strengths-intro { max-width: none; margin-top: 24px; font-size: 18px; line-height: 2; }
.strength-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px 64px; margin-top: 40px; }
.strength, .strength:first-child, .strength:last-child, .strength:nth-child(odd), .strength:nth-child(even) { padding: 28px 0; border: 0; border-top: 1px solid #cdd8c6; gap: 24px; }
.strength > .icon { width: 36px; height: 36px; margin-top: 3px; }
.strength > div { min-width: 0; }
.strength h3 { font-size: 24px; letter-spacing: 0; white-space: normal; text-wrap: balance; }
.strength p { font-size: 17px; line-height: 1.95; margin-top: 12px; max-width: 30em; }
.service-line { margin-top: 20px; padding-top: 28px; gap: 20px; }
.service-line p { font-size: 16px; line-height: 1.95; }
.service-line .text-link { margin-left: auto; }
.step h3 { margin-top: 24px; margin-bottom: 14px; }
.step p { font-size: 16px; line-height: 1.9; }
.page-intro { padding: 32px 0 56px; }
.page-intro h1 { font-size: 44px; line-height: 1.5; }
.page-intro p { font-size: 18px; line-height: 1.95; max-width: 36em; margin-top: 24px; }
.breadcrumbs { margin-bottom: 30px; }
.product-intro { padding-bottom: 64px; }
.product-intro .product-grid { align-items: start; }
.product-intro .button-row { margin-top: 28px; gap: 12px; }
.product-intro .button { padding-inline: 18px; }
.topic h3 { margin-top: 18px; margin-bottom: 16px; }
.topic p, .principle p { line-height: 1.95; }
.article-grid { max-width: 1100px; grid-template-columns: 225px minmax(0,1fr); gap: 64px; }
.guide-nav { top: 116px; padding-top: 0; }
.guide-menu > summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; padding-block: 16px; font-size: 18px; font-weight: 600; }
.guide-menu > summary .icon { width: 20px; height: 20px; }
.guide-menu[open] > summary .icon { transform: rotate(45deg); }
.guide-nav a { padding-block: 16px; line-height: 1.8; }
.guide-block { scroll-margin-top: 16px; }
.guide-block h2 { line-height: 1.55; }
.guide-block h3 { margin-top: 30px; margin-bottom: 16px; }
.guide-block p, .guide-block li { line-height: 2; }
.contact-grid { gap: 64px; }
.contact-intro h2 { font-size: 32px; margin-bottom: 28px; }
.contact-options { margin-top: 0; margin-bottom: 28px; }
.contact-option { padding-block: 24px; }
.contact-phone { display: inline-block; font-size: 30px; font-weight: 600; letter-spacing: .015em; line-height: 1.6; padding-block: 4px; }
.contact-phone:hover { text-decoration: underline; text-underline-offset: 6px; }
.wechat-qr-card { display: flex; align-items: center; gap: 20px; margin: 0 0 28px; padding: 18px; border: 1px solid var(--line); background: var(--sage); }
.wechat-qr-card img { width: 180px; height: 180px; flex: 0 0 180px; object-fit: contain; background: #fff; }
.wechat-qr-card figcaption { display: flex; flex-direction: column; gap: 7px; font-size: 15px; line-height: 1.8; color: var(--muted); }
.wechat-qr-card figcaption strong { color: var(--ink); font-size: 18px; font-weight: 600; }
.request-box { padding: 36px; scroll-margin-top: 20px; }
.request-box h2 { font-size: 28px; margin-bottom: 18px; }
.request-box > p { margin-bottom: 28px; }
.form-grid { gap: 24px; }
.field { gap: 12px; }
.summary-output { scroll-margin-top: 20px; }
.summary-output h3 { line-height: 1.7; }
.summary-output h3:focus { outline: none; }
.summary-output textarea { font-size: 16px; }
.footer-links a, .footer-contact a, .footer-contact button { min-height: 44px; }

@media (max-width: 1200px) {
  .nav { gap: 20px; }
  .nav a { font-size: 14px; }
  .hero-content h1 { font-size: 48px; }
  .hero-content { padding-block: 80px 96px; }
  .strength-grid { column-gap: 40px; }
  .contact-grid { gap: 40px; }
  .product-grid { gap: 40px; }
}
@media (max-width: 1000px) {
  .brand-name { font-size: 25px; }
  .brand-mark { width: 42px; height: 42px; }
  .brand-sub { font-size: 10px; }
  .nav { gap: 15px; }
  .nav a { font-size: 13px; }
  .hero-content h1 { font-size: 44px; }
  .article-grid { grid-template-columns: 205px minmax(0,1fr); gap: 40px; }
  .strength h3 { font-size: 22px; }
  .request-box { padding: 28px; }
  .contact-phone { font-size: 27px; }
}
@media (max-width: 800px) {
  html { scroll-padding-top: 96px; }
  .header-inner { min-height: 80px; }
  .nav { top: 80px; gap: 0; }
  .nav a { font-size: 16px; padding-block: 15px; }
  .section, .base-strengths, .product-overview { padding-block: 56px; }
  h2, .product-overview h2 { font-size: 32px; }
  .base-strengths h2 { font-size: 34px; }
  .page-intro h1 { font-size: 38px; }
  .hero-content { padding-block: 64px 88px; }
  .hero-content h1 { font-size: 40px; }
  .hero-content p { font-size: 18px; }
  .hero-content .eyebrow { font-size: 14px; }
  .base-strengths .strengths-intro { font-size: 17px; }
  .strength-grid { gap: 8px 32px; }
  .strength, .strength:nth-child(odd), .strength:nth-child(even) { gap: 18px; padding-block: 24px; }
  .strength p { font-size: 16px; }
  .strength > .icon { width: 30px; height: 30px; }
  .article-grid { grid-template-columns: minmax(0,1fr); gap: 32px; }
  .guide-nav { position: static; border-bottom: 1px solid var(--line); }
  .guide-menu nav { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; padding-bottom: 12px; }
  .guide-menu:not([open]) > nav { display: none; }
  .guide-menu > summary { min-height: 60px; font-size: 17px; }
  .guide-block { scroll-margin-top: 12px; }
  .contact-grid { grid-template-columns: minmax(0,1fr); gap: 36px; }
  .contact-grid .request-box { order: 0; }
  .contact-intro h2 { font-size: 30px; }
  .contact-options { margin-top: 0; }
  .wechat-qr-card { align-items: flex-start; }
  .contact-intro > p { max-width: 36em; }
  .request-box { padding: 32px; }
  .footer-bottom { font-size: 12px; line-height: 1.9; }
}
@media (max-width: 560px) {
  .brand-name { font-size: 22px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-sub { font-size: 10px; line-height: 1.5; }
  .brand { gap: 9px; }
  .section, .base-strengths, .product-overview { padding-block: 48px; }
  h2, .product-overview h2 { font-size: 28px; }
  .eyebrow { font-size: 12px; margin-bottom: 20px; }
  .hero-content { padding-top: 44px; padding-bottom: 76px; }
  .hero-content .eyebrow { font-size: 13px; margin-bottom: 20px; }
  .hero-content h1 { font-size: clamp(28px,7.6vw,36px); line-height: 1.6; letter-spacing: 0; }
  .hero-content p { font-size: 16px; line-height: 1.95; margin-top: 24px; }
  .hero-content .button-row { margin-top: 28px; gap: 12px; }
  .hero-content .button { font-size: 16px; min-height: 52px; padding: 12px 18px; }
  .product-grid { gap: 32px; }
  .content-lead, .product-overview .content-lead { font-size: 17px; margin-top: 20px; }
  .spec-row, .product-overview .spec-row { grid-template-columns: 76px minmax(0,1fr); gap: 14px; font-size: 15px; padding-block: 20px; }
  .spec-row dd { padding-left: 14px; }
  .base-strengths h2 { font-size: 28px; line-height: 1.65; }
  .base-strengths .eyebrow { font-size: 12px; }
  .base-strengths .strengths-intro { font-size: 16px; line-height: 2; margin-top: 24px; }
  .strength-grid { grid-template-columns: minmax(0,1fr); gap: 0; margin-top: 32px; }
  .strength, .strength:nth-child(odd), .strength:nth-child(even) { padding: 26px 0; gap: 18px; }
  .strength h3 { font-size: 21px; line-height: 1.6; }
  .strength p { margin-top: 12px; line-height: 1.95; }
  .service-line { display: grid; grid-template-columns: 25px minmax(0,1fr); gap: 16px; margin-top: 4px; padding-top: 26px; align-items: start; }
  .service-line p { min-width: 0; font-size: 15px; }
  .service-line .text-link { grid-column: 2; justify-self: start; margin: 0; }
  .step { padding-block: 24px; gap: 10px 18px; }
  .step h3 { margin: 0; }
  .step p { font-size: 15px; }
  .section-heading { margin-bottom: 28px; gap: 20px; }
  .page-intro { padding: 24px 0 40px; }
  .breadcrumbs { margin-bottom: 24px; }
  .page-intro h1 { font-size: 30px; line-height: 1.65; }
  .page-intro p { font-size: 16px; line-height: 1.95; margin-top: 20px; }
  .page-intro .intro-bottom { gap: 24px; }
  .product-intro .button-row { gap: 12px; margin-top: 24px; }
  .product-intro .button { font-size: 15px; }
  .guide-menu nav { grid-template-columns: 1fr; }
  .guide-block h2 { font-size: 24px; }
  .guide-block h3 { font-size: 20px; }
  .contact-intro h2 { font-size: 27px; margin-bottom: 24px; }
  .contact-phone { font-size: 28px; }
  .contact-option { gap: 12px; }
  .contact-option strong { font-size: 19px; }
  .wechat-qr-card { flex-direction: column; align-items: flex-start; gap: 14px; padding: 16px; }
  .wechat-qr-card img { width: 180px; height: 180px; }
  .request-box { padding: 26px 20px; }
  .request-box h2 { font-size: 25px; }
  .form-grid { grid-template-columns: minmax(0,1fr); gap: 24px; }
  .summary-output h3 { font-size: 18px; }
  .cta h2 { font-size: 26px; }
  .site-footer .brand-sub { font-size: 11px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  .section, .base-strengths, .product-overview, .page-intro { padding-block: 20px; }
  .contact-grid, .article-grid { display: block; }
}