.mobile-language { display: none; }
@media (max-width: 620px) {
  html { scroll-padding-top: 20px; -webkit-text-size-adjust: 100%; }
  body { padding-inline: env(safe-area-inset-left) env(safe-area-inset-right); }
  header {
    position: relative; z-index: 20; display: flex; flex-wrap: nowrap;
    height: auto; min-height: 68px; gap: 12px;
    padding: calc(10px + env(safe-area-inset-top)) 20px 10px;
  }
  header > .brand { flex: 1; min-width: 0; gap: 8px; min-height: 44px; }
  header .brand-eye { font-size: 30px; }
  header .brand-label { display: block; max-width: 136px; font-size: 10px; line-height: 1.4; }
  header .draft-name { font-size: 8px; margin-top: 2px; }
  header > nav:not(.language-switch) { margin: 0; gap: 0; }
  header > nav > a { display: none; }
  header > nav > a:first-child { display: inline-flex; align-items: center; min-height: 44px; font-size: 11px; }
  header > .language-switch { display: none !important; }
  .mobile-language { display: block; position: relative; flex: 0 0 auto; }
  .mobile-language summary {
    display: flex; align-items: center; justify-content: center; gap: 5px;
    min-width: 52px; min-height: 44px; padding: 10px 8px;
    border: 1px solid #22251f30; border-radius: 24px; font-size: 11px;
    list-style: none; cursor: pointer;
  }
  .mobile-language summary::-webkit-details-marker { display: none; }
  .mobile-language summary .icon { width: 12px; }
  .mobile-language[open] summary { background: var(--ink); color: var(--paper); }
  .mobile-language nav {
    position: absolute; right: 0; top: calc(100% + 8px); display: flex;
    flex-direction: column; gap: 4px; min-width: 76px; padding: 6px;
    background: var(--paper); border: 1px solid var(--line); border-radius: 16px;
    box-shadow: 0 12px 30px #0002;
  }
  .mobile-language nav > a { display: flex !important; align-items: center; justify-content: center; min-height: 44px; border-radius: 10px; font-size: 12px; }
  .mobile-language nav > a[aria-current=page] { background: var(--orange); color: var(--ink); }
  .vision-hero { display: flex; flex-direction: column; min-height: 0; margin: 0 10px; padding: 22px 20px 18px; }
  .vision-top { padding-bottom: 14px; font-size: 8px; letter-spacing: .05em; line-height: 1.5; }
  .vision-top > span:not(:first-child) { display: none; }
  .vision-heading { padding-top: 24px; }
  .vision-heading h1 { font-size: clamp(46px, 14vw, 80px); max-width: 100%; line-height: .9; letter-spacing: -.07em; }
  html[lang=vi] .vision-heading h1 { font-size: clamp(42px, 12.5vw, 72px); line-height: 1.08; }
  .signal-dot { margin: 5px 0 0 6px; }
  .vertical-note { display: none; }
  .eye-stage { position: relative; inset: auto; width: 100%; height: clamp(190px, 30svh, 265px); margin: 4px 0 12px; flex: 0 0 auto; }
  .eye-object { inset: 0; }
  .orbital { width: 76%; left: 12%; height: 50%; top: 25%; }
  .orbital-two { width: 66%; left: 17%; }
  .eye-serial, .eye-coordinate, .eye-cross { display: none; }
  .vision-bottom { display: flex; flex-direction: column; align-items: stretch; gap: 20px; margin: 0; }
  .vision-bottom .eyebrow { font-size: 8px; line-height: 1.5; letter-spacing: .04em; }
  .vision-bottom p { font-size: clamp(25px, 7vw, 32px); margin: 10px 0 12px; line-height: 1.1; }
  .hero-description { font-size: 13px; line-height: 1.6; max-width: none; }
  .vision-actions { width: 100%; padding: 0; }
  .primary-cta { min-height: 54px; padding: 16px 18px; gap: 14px; line-height: 1.4; text-align: left; }
  .vision-actions .primary-cta { min-height: 54px; font-size: 14px; }
  .vision-work-link { padding: 16px 0 2px; min-height: 44px; align-items: center; font-size: 12px; }
  .vision-foot { display: none; }
  .discipline-strip { gap: 12px; padding: 20px; font-size: 11px; }
  .discipline-strip i { font-size: 16px; }
  .work-v3 { padding: 44px 20px; }
  .work-v3 .section-heading { padding: 0 0 26px; }
  .work-v3 .section-heading h2 { font-size: 34px; margin-top: 14px; line-height: 1.1; }
  .work-v3 .projects { grid-template-columns: 1fr; gap: 36px; }
  .work-v3 .project-card { margin-top: 0; }
  .work-v3 .art, .work-v3 .project-thread .art { aspect-ratio: 1.15; }
  .art-corner { top: 16px; left: 16px; }
  .art-caption { left: 16px; bottom: 16px; font-size: 8px; }
  .project-hard .art-corner, .project-hard .art-caption { display: none; }
  .work-v3 .project-title { margin-top: 16px; }
  .work-v3 .project-title h3 { font-size: 28px; }
  .project-meta { gap: 12px; line-height: 1.5; }
  .work-v3 .role { font-size: 13px; line-height: 1.6; margin-top: 12px; }
  .build-manifesto { margin: 0 10px 36px; padding: 32px 20px; grid-template-columns: 1fr; gap: 24px; }
  .build-manifesto h2, html[lang=en] .build-manifesto h2, html[lang=vi] .build-manifesto h2 { font-size: 11vw; line-height: 1.03; }
  .manifesto-copy p { font-size: 16px; line-height: 1.65; }
  .manifesto-symbol { display: none; }
  .portfolio-v3 .simple-start, .portfolio-v3 .about, .portfolio-v3 .faq { padding: 36px 20px; grid-template-columns: 1fr; gap: 24px; }
  .portfolio-v3 .simple-start { flex-direction: column; align-items: stretch; }
  .portfolio-v3 .start-section h2, .portfolio-v3 .about h2, .faq h2 { font-size: 34px; line-height: 1.12; }
  .about-copy > p { font-size: 16px; line-height: 1.7; }
  .faq summary { min-height: 56px; padding-block: 18px; line-height: 1.5; }
  .contact-strip { margin: 16px 20px 40px; padding: 24px; }
  .contact-strip > a { font-size: 34px; letter-spacing: -.05em; padding-right: 28px; margin: 20px 0 4px; }
  .contact-strip > a > span { right: 20px; font-size: 28px; }
  .contact-page, .calculator-page, .case-head { padding: 28px 20px 36px; }
  .back { display: inline-flex; align-items: center; min-height: 44px; margin-bottom: 24px; }
  .contact-page h1, .calculator-page h1, .case-head h1 { font-size: clamp(38px, 11vw, 60px); line-height: 1.08; overflow-wrap: anywhere; }
  .contact-page > p, .calculator-page > p, .case-intro { font-size: 16px; line-height: 1.65; }
  .contact-layout { grid-template-columns: 1fr; gap: 28px; }
  .contact-layout .contact-box { grid-row: 1; }
  input, textarea, select { font-size: 16px !important; }
  textarea { min-height: 180px; line-height: 1.6; padding: 16px; max-width: 100%; resize: vertical; }
  .message-actions { display: grid; grid-template-columns: 1fr; gap: 12px; }
  .message-actions .primary-cta, .message-actions button { width: 100%; min-height: 48px; justify-content: space-between; }
  .message-actions #copy-brief { padding: 14px; }
  .identity-card { padding: 24px; }
  .identity-card h2 { font-size: 28px; overflow-wrap: anywhere; }
  .contact-channel small { overflow-wrap: anywhere; }
  .vcard-link, .estimate-link, .profile-links a { display: inline-flex; align-items: center; min-height: 44px; }
  .case-head dl { grid-template-columns: 1fr; gap: 20px; margin-top: 28px; }
  .case-head + .art.hard { margin: 0 20px; aspect-ratio: 1007/988; }
  .case-head + .art.hard .hard-real-cover { object-fit: contain; }
  .case-head + .art.hard .art-corner, .case-head + .art.hard .art-caption { display: none; }
  .case-body { padding: 36px 20px; grid-template-columns: 1fr; gap: 24px; }
  .case-body p { font-size: 16px; line-height: 1.7; }
  .case-body h3 { font-size: 24px; line-height: 1.25; }
  .hard-gallery figcaption, .source-note { line-height: 1.6; overflow-wrap: anywhere; }
  .case-cta { margin-inline: 20px; padding: 24px; flex-direction: column; align-items: stretch; gap: 20px; }
  .case-cta h2 { font-size: 26px; }
  .calculator-layout { grid-template-columns: 1fr; margin-top: 28px; gap: 24px; }
  .product-options { grid-template-columns: 1fr; }
  .product-options label { min-height: 64px; padding: 18px; margin: 0; }
  .calc-check { min-height: 44px; margin: 8px 0; }
  .estimate-result { padding: 24px; }
  .estimate-result output { font-size: clamp(27px, 8vw, 38px); overflow-wrap: anywhere; }
  footer { padding: 24px 20px calc(24px + env(safe-area-inset-bottom)); flex-wrap: wrap; gap: 20px; line-height: 1.6; }
  #analytics-consent { max-height: calc(100svh - 24px); overflow: auto; padding-bottom: calc(20px + env(safe-area-inset-bottom)); }
}
@media (max-width: 360px) {
  header { padding-inline: 16px; gap: 8px; }
  header .brand-label { max-width: 112px; }
  header > nav > a:first-child { font-size: 10px; }
  .vision-hero { padding-inline: 18px; }
  .discipline-strip { gap: 8px; font-size: 10px; }
}
@media (max-width:620px) {
  .discipline-strip { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; padding-inline: 20px; text-align: center; }
  .discipline-strip i { display: none; }
  .discipline-strip span { min-width: 0; }
}
@media (max-width:620px) {
  .mobile-language nav { width: 88px; min-width: 88px; align-items: stretch; padding: 6px; gap: 4px; border-radius: 16px; }
  .mobile-language nav > a { flex: 0 0 44px; width: 100%; height: 44px; min-height: 44px; padding: 0; margin: 0; line-height: 1; border: 0; }
  .mobile-language summary { margin: 0; }
}
/* Keep copyable content selectable, without selection handles on interface chrome. */
body { -webkit-user-select: none; user-select: none; }
main h1, main h2, main h3, main p, main dt, main dd, main figcaption,
.contact-channel small, .identity-card > p, .about-copy, .case-body,
input, textarea { -webkit-user-select: text; user-select: text; }
header, nav, summary, button, .primary-cta, .estimate-link, .vision-work-link,
.art, .project-link, .next-project, .back, .language-switch, .mobile-language {
  -webkit-user-select: none !important; user-select: none !important;
  -webkit-touch-callout: none;
}