:root {
    color-scheme: light;
    --page: #f8fafc;
    --card: #fff;
    --text: #172033;
    --muted: #56677d;
    --accent: #0465ae;
    --accent-hover: #034f88;
    --tint: #edf5fc;
    --border: #dce5ee;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--text);
    background: var(--page);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); }
a:focus-visible, video:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
img { max-width: 100%; }
.skip-link { position: absolute; top: 8px; left: 16px; z-index: 10; padding: 12px 18px; background: var(--card); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.site-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    max-width: 1168px;
    min-height: 90px;
    margin: 0 auto;
    padding: 20px 24px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; }
.brand-mark { display: flex; align-items: center; justify-content: center; min-width: 76px; height: 48px; padding: 8px; background: #fff; border: 1px solid var(--border); border-radius: 10px; }
.brand-mark img { display: block; }
.brand-name { font-size: 21px; font-weight: 750; letter-spacing: -.04em; }
.back-link { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; text-decoration: none; }
.back-link:hover, .text-link:hover { text-decoration: underline; }
.page-content { max-width: 1168px; padding: 0 24px; margin: 0 auto; }
.page-intro { max-width: 760px; margin: 46px auto 48px; text-align: center; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
h1 { margin: 0 0 18px; font-size: clamp(30px, 4.4vw, 46px); font-weight: 750; line-height: 1.15; letter-spacing: -.035em; }
.intro-description { max-width: 640px; margin: 0 auto; color: var(--muted); font-size: 18px; line-height: 1.7; }
.platform-selector { display: flex; justify-content: center; gap: 10px; margin: -12px 0 30px; }
.platform-tab { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 11px 22px; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); background: var(--card); font: inherit; font-size: 15px; font-weight: 650; line-height: 1.5; cursor: pointer; }
.platform-tab[aria-selected="true"] { color: var(--accent); background: var(--tint); border-color: var(--accent); }
.platform-tab:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.platform-tab:disabled { cursor: default; color: var(--muted); opacity: .7; }
.platform-coming-soon { padding: 2px 8px; border: 1px solid var(--border); border-radius: 999px; font-size: 10px; font-weight: 600; line-height: 1.5; }
.platform-section { margin-bottom: 58px; }
.platform-overview { display: grid; grid-template-columns: minmax(0, 1fr) 342px; align-items: center; gap: 56px; padding: 46px 58px; border: 1px solid var(--border); border-radius: 24px; background: var(--card); }
.platform-label { display: inline-flex; padding: 5px 14px; margin-bottom: 18px; color: var(--accent); background: var(--tint); border-radius: 999px; font-size: 13px; font-weight: 700; }
.platform-intro h2 { margin: 0 0 18px; font-size: clamp(27px, 3.2vw, 37px); line-height: 1.2; letter-spacing: -.025em; }
.platform-intro > p { max-width: 460px; margin: 0; color: var(--muted); font-size: 17px; }
.overview-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 16px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 48px; padding: 12px 20px; border: 1px solid transparent; border-radius: 9px; font-size: 15px; font-weight: 650; line-height: 1.5; text-decoration: none; text-align: center; }
.button-primary { color: #fff; background: var(--accent); }
.button-primary:hover { color: #fff; background: var(--accent-hover); }
.text-link { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 650; text-decoration: none; }
.app-summary { display: flex; align-items: center; gap: 14px; max-width: 430px; padding-top: 24px; margin-top: 32px; border-top: 1px solid var(--border); }
.app-summary img { flex-shrink: 0; border: 1px solid var(--border); border-radius: 11px; }
.app-summary p { margin: 0; font-size: 13px; line-height: 1.55; }
.app-summary strong, .app-summary span { display: block; }
.app-summary span { margin-top: 3px; color: var(--muted); }
.video-card { scroll-margin-top: 24px; width: 100%; max-width: 342px; margin: 0; justify-self: center; }
.video-container { overflow: hidden; border: 1px solid #253047; border-radius: 16px; background: #101829; box-shadow: 0 16px 40px rgba(15, 23, 42, .15); }
video { display: block; width: 100%; height: auto; aspect-ratio: 9 / 16; max-height: 610px; object-fit: contain; }
.video-card figcaption { margin-top: 16px; text-align: center; font-size: 13px; line-height: 1.6; }
.video-card figcaption strong, .video-card figcaption span { display: block; }
.video-card figcaption span { color: var(--muted); }
.instructions { padding-top: 58px; scroll-margin-top: 24px; }
.instructions-heading { margin-bottom: 30px; }
.instructions-heading h2 { max-width: 740px; margin: 0 0 10px; font-size: clamp(25px, 3vw, 32px); line-height: 1.3; letter-spacing: -.025em; }
.instructions-heading > p:last-child { margin: 0; color: var(--muted); }
.installation-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; padding: 0; margin: 0; list-style: none; }
.installation-steps > li { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; min-width: 0; padding: 26px; border: 1px solid var(--border); border-radius: 14px; background: var(--card); }
.step-number { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; width: 36px; height: 36px; color: var(--accent); background: var(--tint); border-radius: 11px; font-size: 15px; font-weight: 750; }
.installation-steps h3 { margin: 0 0 10px; font-size: 17px; line-height: 1.4; }
.installation-steps p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.installation-steps strong { color: var(--text); font-weight: 650; }
.installation-steps p.step-note { margin-top: 12px; font-size: 12px; line-height: 1.6; }
.address { overflow-wrap: anywhere; }
.address-link { white-space: nowrap; font-weight: 650; }
.share-symbol { display: inline-flex; width: 25px; height: 25px; margin: 0 3px; color: var(--accent); vertical-align: middle; }
.share-symbol svg { width: 100%; height: 100%; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.menu-symbol { display: inline-flex; align-items: center; justify-content: center; min-width: 29px; height: 25px; padding: 0 4px 4px; color: var(--text); background: var(--tint); border-radius: 5px; font-size: 20px; font-weight: 700; vertical-align: middle; }
.login-callout { display: flex; align-items: center; justify-content: space-between; gap: 32px; padding: 30px 34px; margin-top: 32px; border: 1px solid var(--border); border-radius: 14px; background: var(--tint); }
.login-callout h2 { margin: 0 0 5px; font-size: 21px; line-height: 1.35; }
.login-callout p { margin: 0; color: var(--muted); font-size: 15px; }
.login-callout .button { flex-shrink: 0; }
.site-footer { display: flex; justify-content: space-between; align-items: center; gap: 24px; max-width: 1120px; margin: 0 auto; padding: 24px 0 32px; border-top: 1px solid var(--border); color: var(--muted); font-size: 12px; }
.site-footer a { font-weight: 600; text-decoration: none; }

@media (max-width: 1000px) {
    .platform-overview { grid-template-columns: minmax(0, 1fr) 290px; gap: 34px; padding: 34px; }
    .installation-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .site-footer { margin-left: 24px; margin-right: 24px; }
}
@media (max-width: 700px) {
    .site-header { min-height: 76px; padding: 16px 20px; gap: 16px; }
    .brand-mark { min-width: 64px; height: 42px; }
    .brand-name { font-size: 18px; }
    .back-link { font-size: 12px; gap: 5px; }
    .page-content { padding: 0 16px; }
    .page-intro { margin: 28px auto 30px; }
    .intro-description { font-size: 16px; }
    .platform-selector { margin: -6px 0 24px; gap: 8px; }
    .platform-tab { padding: 10px 16px; font-size: 14px; gap: 7px; }
    .platform-overview { grid-template-columns: 1fr; gap: 30px; padding: 26px 22px; border-radius: 18px; }
    .platform-intro > p { font-size: 16px; }
    .overview-actions { margin-top: 22px; }
    .app-summary { margin-top: 24px; padding-top: 20px; }
    .video-card { max-width: 290px; }
    .instructions { padding-top: 40px; }
    .instructions-heading { margin-bottom: 22px; }
    .installation-steps { grid-template-columns: 1fr; gap: 12px; }
    .installation-steps > li { flex-direction: row; gap: 16px; padding: 22px 18px; }
    .installation-steps h3 { font-size: 16px; }
    .login-callout { align-items: flex-start; flex-direction: column; gap: 20px; padding: 24px 22px; }
    .login-callout .button { width: 100%; }
    .site-footer { align-items: flex-start; flex-direction: column; gap: 8px; margin-left: 16px; margin-right: 16px; }
    .platform-section { margin-bottom: 38px; }
}
@media (max-width: 380px) {
    .brand-name { display: none; }
    .platform-overview { padding: 22px 16px; }
    .button { font-size: 14px; padding-left: 14px; padding-right: 14px; }
    .installation-steps > li { gap: 12px; padding: 20px 15px; }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
}
@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --page: #101720;
        --card: #172230;
        --text: #edf3fa;
        --muted: #afbdce;
        --accent: #56b7ff;
        --accent-hover: #8bd0ff;
        --tint: #1c3349;
        --border: #304255;
    }
    .button-primary { color: #0c2132; }
    .button-primary:hover { color: #0c2132; }
    .brand-mark { border-color: #ccd5df; }
}

.instruction-privacy { max-width: 1120px; margin: 0 auto 24px; padding: 0 16px; color: var(--muted); font-size: 12px; line-height: 1.5; }