/* Shared hierarchy, readable Vietnamese typography, and compact feature groups. */
:root{--section-space:clamp(3.75rem,6vw,5.5rem)}
.section{padding-block:var(--section-space)}
.section h2,.contact-section h2{font-size:clamp(1.875rem,3.2vw,2.875rem);line-height:1.3;letter-spacing:-.025em;text-wrap:balance}
.section-heading{margin-bottom:2.25rem}
.section-heading .eyebrow,.company-copy>.eyebrow,.application-copy>.eyebrow,.function-copy>.eyebrow,.accessory-copy>.eyebrow,.upgrade-copy>.eyebrow,.contact-section .eyebrow{font-size:.875rem;letter-spacing:.08em}
.split-heading{gap:2.5rem;align-items:end}
.split-heading>p,.split-heading>div>p:not(.eyebrow){font-size:1rem;line-height:1.8;max-width:38rem}
.button{min-height:48px}
.button-small{min-height:44px}
.main-nav a{font-size:.875rem;min-height:44px;display:flex;align-items:center}
.comparison-hero{max-width:1600px;margin-inline:auto;padding-top:2.5rem}
.comparison-intro{margin-bottom:1.75rem}
.comparison-intro h1{letter-spacing:-.03em;text-wrap:balance}
.comparison-intro>p:last-child{font-size:1rem;line-height:1.8}
.comparison-intro .eyebrow{letter-spacing:.08em}
.hero-motion figcaption,.multitask-motion figcaption{font-size:.875rem}
.hero-multitask{margin-block:0 2.5rem}
.multitask-copy h2{letter-spacing:-.025em;text-wrap:balance}
.comparison-subheading h2{letter-spacing:-.025em;text-wrap:balance}
.comparison-subheading p{font-size:1rem}
.comparison-install-steps{font-size:.875rem;flex-wrap:wrap}
.function-index{padding-block:2.25rem}
.function-index-heading{margin-bottom:1.75rem}
.function-index h2{font-size:clamp(1.25rem,2vw,1.625rem);letter-spacing:-.015em}
.function-links a{font-size:.9375rem;line-height:1.65}
.function-layout{gap:3.25rem}
.function-points{margin-block:1.25rem}
.function-points li{padding-block:.875rem}
.function-visual-stack{gap:1.25rem}
.application-section{background:#fff;border-color:var(--line)}
.application-intro{gap:2.75rem}
.application-description{margin-top:1.25rem}
.application-figure,.application-features,.application-support{border-color:var(--line)}
.application-figure-header>span:last-child,.application-figure figcaption,.application-download-note,.application-feature-number{font-size:.875rem}
.application-features{margin-top:2.5rem;padding-top:1.75rem;gap:2rem}
.application-features p,.application-support p{font-size:1rem}
.application-support{margin-top:1.75rem;padding:1.25rem 1.5rem;background:var(--surface)}
.technical-section{border-block:1px solid var(--line)}
.technical-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.5rem;align-items:stretch}
.technical-card{min-width:0;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
.technical-art{display:block;flex-shrink:0;background:#fff;border-bottom:1px solid var(--line)}
.technical-art img{width:100%;height:auto;aspect-ratio:4/3;object-fit:contain}
.technical-copy{display:flex;flex-direction:column;align-items:flex-start;flex:1;padding:1.5rem}
.technical-copy .eyebrow{font-size:.875rem;color:var(--orange-text);letter-spacing:.06em;margin-bottom:.75rem}
.technical-copy h3{font-size:1.5rem;line-height:1.4;letter-spacing:-.02em;margin-bottom:1rem}
.technical-copy>p:not(.eyebrow){font-size:1rem;line-height:1.8;color:var(--muted)}
.technical-copy ul{padding-left:1.1rem;margin:1rem 0 1.25rem;font-size:1rem;line-height:1.8;color:var(--muted)}
.technical-copy li+li{margin-top:.5rem}
.technical-copy .technical-note{font-size:.875rem!important;margin-bottom:1.25rem}
.technical-copy>.text-link{margin-top:auto;font-size:.875rem;gap:.75rem}
.accessory-grid{gap:3rem}
.accessory-visual img{aspect-ratio:16/10;object-fit:contain}
.accessory-copy>p:not(.eyebrow):not(.small-note){font-size:1rem;line-height:1.8}
.image-tag,.small-note,.power-specs p{font-size:.875rem}
#san-pham>.section{padding-bottom:3rem}
.product-grid{gap:1.5rem}
.product-card{padding:2rem}
.product-label{font-size:.875rem;letter-spacing:.06em}
.product-card .display-size{font-family:var(--display);font-size:clamp(4.5rem,8vw,7rem);font-weight:600;line-height:1.1;letter-spacing:-.055em;margin:1.5rem 0 1.25rem}
.product-card .display-size>span{font-size:1.125rem;font-family:var(--font);letter-spacing:0;margin-left:.5rem}
.product-card>p{font-size:1rem;line-height:1.8;min-height:3.6em}
.product-card>small,.product-specs span,.product-price span{font-size:.875rem;letter-spacing:0}
.product-price strong{letter-spacing:-.025em}
.included{gap:1.25rem;padding-block:1.5rem}
.included>span,.included p{font-size:.875rem;line-height:1.8}
.own-phone{margin-top:1rem}
.own-phone h3{font-size:clamp(1.5rem,2.3vw,2rem);line-height:1.4;letter-spacing:-.02em}
.own-phone p:not(.eyebrow){font-size:1rem;line-height:1.8}
.own-phone .eyebrow{font-size:.875rem;letter-spacing:.06em}
.own-phone-prices span{font-size:.875rem}
#bang-gia{padding-block:3.5rem}
.price-table{font-size:1rem;font-variant-numeric:tabular-nums}
.price-table caption,.price-table thead,.price-table tbody th,.price-footer p{font-size:.875rem}
.price-table th,.price-table td{padding:1.25rem}
.order-preset{display:flex;align-items:center;justify-content:space-between;gap:.5rem;width:max-content;min-height:44px;margin-top:.375rem;padding:.5rem .75rem;border:1px solid var(--line);border-radius:8px;color:var(--orange-text);font-size:.875rem;font-weight:600;text-decoration:none}
.order-preset:hover{background:#fff3eb;border-color:var(--orange-text)}
.order-preset:focus-visible{outline:2px solid var(--orange-text);outline-offset:3px}
.order-preset .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.price-footer p{line-height:1.8}
.price-footer p>a{color:var(--ink);text-decoration:underline;text-underline-offset:4px}
#nang-cap{padding-top:0}
.upgrade-feature{padding:2rem;gap:2rem}
.upgrade-section .upgrade-copy h2{font-size:clamp(1.75rem,2.7vw,2.375rem);letter-spacing:-.025em}
#dong-xe{border-top:1px solid var(--line)}
.gallery-toolbar{margin-bottom:1.5rem}
.car-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:1.25rem}
.car-card>div{padding:1rem}
.installation-card>span{font-size:.9375rem}
.installation-video-copy h3{font-size:clamp(1.5rem,2.5vw,2rem);letter-spacing:-.025em}
.company-section{background:#f5f6f6}
.company-solutions{margin-top:2.5rem;gap:2rem}
#video{background:#fff}
.video-card h3{font-size:1.25rem;letter-spacing:-.02em}
.video-card .eyebrow,.video-card figcaption>div>p{font-size:.875rem}
.document-highlights{margin-bottom:2rem}
.document-card>div{padding:1.25rem}
.document-card>div>span,.resource-count{font-size:.875rem}
.resource-group summary{font-size:1.0625rem;min-height:64px}
.contact-section{background:#10181d;color:#fff;padding-block:var(--section-space)}
.contact-section .eyebrow{color:#ffb498}
.contact-section h2{color:#fff}
.contact-section p:not(.eyebrow){font-size:1rem;line-height:1.8;color:#d4dce0}
.contact-actions>span{font-size:.875rem;color:#d4dce0}
.button-transparent{border-color:#76848d;color:#fff}
.button-transparent:hover{background:#263238}
.site-footer{grid-template-columns:minmax(0,.75fr) minmax(0,1.6fr);gap:2.5rem;padding-top:3rem}
.site-footer>.footer-brand p{font-size:.875rem;line-height:1.8;max-width:24rem}
.footer-navigation{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.75rem}
.footer-navigation>div{display:flex;flex-direction:column;align-items:flex-start;min-width:0}
.footer-navigation h3{font-size:1rem;margin-bottom:.75rem;font-weight:600}
.footer-navigation a{display:flex;align-items:center;min-height:44px;font-size:.875rem;line-height:1.7;color:var(--muted);padding-block:.375rem}
.footer-navigation a:hover{color:var(--orange-text)}
.footer-bottom{font-size:.875rem;line-height:1.8;align-items:center}
@media(max-width:1100px){
  .technical-grid{grid-template-columns:1fr}
  .technical-card{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:start}
  .technical-art{height:100%;display:flex;align-items:center;border-bottom:0;border-right:1px solid var(--line)}
  .technical-copy{height:100%}
  .technical-copy>.text-link{margin-top:1rem}
  .car-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .site-footer{grid-template-columns:1fr}
  .site-footer .brand-logo{width:170px;height:76px}
}
@media(max-width:920px){
  .split-heading{gap:1.5rem}
  .function-layout,.application-intro,.accessory-grid{gap:1.75rem}
  .application-features{gap:1.5rem}
  .product-card{padding:1.5rem}
  .product-price strong{font-size:clamp(1.5rem,3.2vw,1.875rem)}
  .car-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .company-solutions{gap:1.5rem}
}
@media(max-width:650px){
  .comparison-hero{padding-top:1.5rem}
  .comparison-intro .eyebrow{font-size:.8125rem;letter-spacing:.04em}
  .hero-multitask{margin-bottom:1.875rem}
  .section-heading{margin-bottom:1.75rem}
  .section h2,.contact-section h2{font-size:clamp(1.875rem,7.6vw,2.375rem)}
  .function-links a{font-size:.9375rem}
  .application-figure figcaption{flex-wrap:wrap}
  .application-features{margin-top:1.875rem}
  .application-support{padding:1.25rem}
  .technical-card{display:flex;flex-direction:column;align-items:stretch}
  .technical-art{height:auto;border-right:0;border-bottom:1px solid var(--line)}
  .technical-copy{height:auto;padding:1.375rem}
  .technical-copy h3{font-size:1.375rem}
  .technical-copy>.text-link{margin-top:.5rem}
  .technical-grid{gap:1.5rem}
  .image-tag{position:static;margin-top:.75rem}
  .product-card .display-size{font-size:clamp(4.5rem,20vw,6rem)}
  .product-card>p{min-height:0}
  .product-price strong{font-size:clamp(1.625rem,7vw,2rem)}
  .included{gap:.625rem}
  .own-phone-illustrated{padding:1.25rem}
  .own-phone-illustrated .own-phone-prices{grid-template-columns:1fr;gap:1rem}
  .own-phone-illustrated .own-phone-prices>div{flex-direction:row;align-items:baseline;justify-content:space-between;gap:.75rem}
  .own-phone-illustrated .own-phone-prices strong{font-size:1.375rem}
  #san-pham>.section{padding-bottom:2rem}
  #bang-gia{padding-block:2.5rem}
  .price-table{white-space:normal}
  .price-table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
  .price-table tbody,.price-table tr,.price-table td,.price-table tbody th{display:block;width:100%}
  .price-table tbody tr{padding:1rem 1.125rem}
  .price-table tbody th{padding:.25rem 0 .625rem;font-weight:600;color:var(--orange-text)}
  .price-table td{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;padding:.375rem 0;text-align:right}
  .price-table td::before{content:attr(data-label);text-align:left;font-size:.875rem;color:var(--muted)}
  .price-table td:last-child{padding-top:.75rem;font-size:1.25rem}
  .upgrade-feature{padding:1.25rem}
  .upgrade-section .upgrade-copy h2{font-size:1.875rem}
  .company-solutions{margin-top:2rem}
  .car-grid{gap:1rem}
  .car-card h3{font-size:.9375rem}
  .document-card>div{padding:1.25rem}
  .resource-group summary{font-size:1rem;gap:.75rem}
  .resource-count{gap:.5rem;font-size:.875rem}
  .footer-navigation{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.75rem 1rem}
  .footer-bottom{gap:.75rem 1.25rem;font-size:.8125rem}
}
@media(max-width:430px){
  .car-grid{grid-template-columns:1fr}
  .own-phone-illustrated .own-phone-prices>div{flex-wrap:wrap}
}