* { box-sizing: border-box; }
html { color-scheme: light dark; scroll-padding-top: 24px; }
body { margin: 0; background: var(--background); color: var(--text); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 16px; line-height: 1.6; }
a { color: var(--primary); text-underline-offset: 4px; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 5px; }
button { font: inherit; }
img { display: block; max-width: 100%; }
h1, h2, p, figure { margin: 0; }
h1, h2 { line-height: 1.12; letter-spacing: -.035em; }
.shell { width: min(1160px, calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: absolute; left: 16px; top: -120px; z-index: 10; padding: 12px 20px; background: var(--surface); border: 2px solid var(--primary); }
.skip-link:focus { top: 16px; }
.site-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; min-height: 120px; border-bottom: 1px solid var(--disabled); }
.wordmark { display: inline-flex; gap: 12px; align-items: center; color: var(--text); text-decoration: none; font-size: 22px; line-height: 1.15; font-weight: 750; letter-spacing: -.025em; }
.wordmark img { border-radius: 13px; }
.wordmark small { display: block; margin-top: 5px; color: var(--text-muted); font-size: 12px; font-weight: 450; letter-spacing: .02em; }
nav { display: flex; gap: 24px; flex-wrap: wrap; }
nav a { min-height: 44px; display: flex; align-items: center; text-decoration: none; font-size: 14px; color: var(--text-muted); }
nav a:hover { color: var(--primary); text-decoration: underline; }
.hero { display: grid; grid-template-columns: 1.3fr 1fr; gap: 90px; padding-block: 80px 88px; align-items: center; }
.eyebrow { color: var(--text-muted); font-size: 12px; font-weight: 650; letter-spacing: .1em; text-transform: uppercase; }
.hero-copy > .eyebrow { display: flex; align-items: center; gap: 10px; color: var(--primary); margin-bottom: 24px; }
.status-dot { height: 8px; width: 8px; border-radius: 50%; background: var(--primary); }
h1 { font-size: clamp(40px, 4.4vw, 60px); font-weight: 750; }
h1 span { color: var(--primary); }
.lead { margin-top: 28px; color: var(--text-muted); max-width: 490px; font-size: 18px; line-height: 1.65; }
.installation { margin-top: 36px; }
.install-actions { display: flex; gap: 12px; }
.install-button { position: relative; display: grid; grid-template-columns: 1fr auto; text-align: left; min-height: 78px; padding: 16px 18px; border: 0; border-radius: 14px; background: var(--primary); color: var(--on-primary); font-weight: 650; text-decoration: none; flex: 1; line-height: 1.4; }
.install-button > :first-child { grid-column: 1; }
.install-button .button-detail { grid-column: 1; display: block; margin-top: 4px; font-size: 12px; font-weight: 400; }
.install-button > [aria-hidden] { grid-column: 2; grid-row: 1 / 3; align-self: center; margin-left: 8px; font-size: 20px; }
.install-button:disabled { background: var(--disabled); color: var(--on-disabled); cursor: not-allowed; }
.install-button[href]:hover { box-shadow: 0 0 0 3px var(--surface), 0 0 0 5px var(--primary); }
.install-note { margin-top: 16px; font-size: 12px; color: var(--text-muted); max-width: 450px; }
.phone-card { background: var(--surface); border: 1px solid var(--disabled); border-radius: 24px; padding: 28px; }
.card-top { display: flex; justify-content: space-between; gap: 12px; align-items: center; margin-bottom: 28px; }
.card-top > :last-child { color: var(--primary); font-size: 24px; }
.phone-card h2 { font-size: 30px; margin-bottom: 12px; }
.phone-card > p:not(.qr-note) { color: var(--text-muted); font-size: 14px; }
.qr-code { margin-block: 24px 16px; display: flex; align-items: center; flex-direction: column; }
.qr-code img { background: #fff; width: 184px; height: 184px; border-radius: 12px; padding: 4px; }
.qr-code figcaption { margin-top: 12px; font-size: 14px; color: var(--text); overflow-wrap: anywhere; font-weight: 600; }
.qr-note { font-size: 12px; color: var(--text-muted); }
.text-link { display: inline-block; margin-top: 14px; padding-block: 10px; font-size: 13px; font-weight: 600; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; padding-block: 40px 52px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--disabled); }
.principle-number { color: var(--primary); font-size: 12px; font-weight: 650; }
.principles h2 { font-size: 22px; margin-top: 14px; margin-bottom: 12px; }
.principles p { font-size: 14px; color: var(--text-muted); }
.faq-section { display: grid; grid-template-columns: 1fr 1.55fr; gap: 80px; padding-block: 80px; }
.section-intro h2 { font-size: 36px; margin-block: 18px; }
.section-intro > p:last-child { color: var(--text-muted); font-size: 15px; }
.faq-list { border-top: 1px solid var(--disabled); }
details { border-bottom: 1px solid var(--disabled); }
summary { display: flex; align-items: center; justify-content: space-between; gap: 24px; list-style: none; min-height: 76px; padding: 18px 4px; font-size: 16px; font-weight: 600; cursor: pointer; line-height: 1.4; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--primary); font-size: 24px; font-weight: 400; }
details[open] summary::after { content: "−"; }
.answer { padding: 0 28px 24px 4px; color: var(--text-muted); font-size: 14px; overflow-wrap: anywhere; }
.answer p + p { margin-top: 12px; }
.answer strong { color: var(--text); font-weight: 600; }
.support-section { display: grid; grid-template-columns: 1.3fr 1fr; gap: 60px; padding: 36px; border: 1px solid var(--disabled); border-radius: 20px; background: var(--surface); }
.support-section h2 { font-size: 28px; margin-block: 14px; }
.support-section p:not(.eyebrow) { font-size: 14px; color: var(--text-muted); }
.support-contact { align-self: center; overflow-wrap: anywhere; }
.support-link { display: inline-block; padding-block: 12px; font-size: 18px; font-weight: 600; }
.support-note { margin-top: 16px; }
.site-footer { padding-block: 36px; display: flex; justify-content: space-between; gap: 24px; color: var(--text-muted); font-size: 11px; }
@media (max-width: 960px) {
  .hero { gap: 36px; }
  .install-actions { flex-direction: column; }
  .faq-section { gap: 40px; }
  .principles { gap: 24px; }
  .support-section { gap: 32px; }
}
@media (max-width: 680px) {
  .shell { width: calc(100% - 40px); }
  .site-header { min-height: auto; padding-block: 24px 16px; flex-wrap: wrap; gap: 16px; }
  nav { gap: 24px; width: 100%; }
  nav a { font-size: 14px; }
  .hero { grid-template-columns: 1fr; padding-block: 40px; gap: 36px; }
  h1 { font-size: clamp(36px, 9.4vw, 52px); }
  .lead { font-size: 16px; margin-top: 24px; }
  .installation { margin-top: 28px; }
  .install-actions { flex-direction: row; flex-wrap: wrap; }
  .install-button { min-width: 140px; }
  .phone-card { padding: 24px; }
  .desktop-break { display: none; }
  .principles { grid-template-columns: 1fr; gap: 28px; padding-block: 32px; }
  .principles article { padding-left: 34px; position: relative; }
  .principle-number { position: absolute; left: 0; top: 2px; }
  .principles h2 { margin-top: 0; }
  .faq-section { grid-template-columns: 1fr; gap: 28px; padding-block: 48px; }
  .section-intro h2 { font-size: 30px; }
  summary { min-height: 76px; }
  .support-section { grid-template-columns: 1fr; padding: 24px; gap: 20px; }
  .support-section h2 { font-size: 26px; }
  .site-footer { flex-direction: column; gap: 12px; font-size: 12px; }
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}