/* Installation extends the public product shell, never the legacy account theme. */
body.bt-product.bt-installation { background: linear-gradient(180deg, #f3f7f9 0, #fff 660px); }
.bt-product.bt-installation #main { max-width: 1220px; margin: auto; padding: 48px 34px 65px; }
.bt-product.bt-installation #main a { color: #007d96; text-decoration: underline; text-underline-offset: 3px; }
.bt-product.bt-installation #main p { color: #65747e; font-size: 13px; line-height: 1.85; }
.bt-product.bt-installation #main code { font-family: ui-monospace, "Cascadia Code", monospace; font-size: .9em; overflow-wrap: anywhere; color: #365f70; }
.bt-product.bt-installation #main .bt-eyebrow { font-size: 10px; letter-spacing: .13em; color: #007d96; font-weight: 700; margin-bottom: 14px; }
.bt-product.bt-installation #main h1 { font-size: clamp(36px, 4.2vw, 55px); line-height: 1.08; letter-spacing: -.05em; }
.bt-product.bt-installation #main h2 { font-size: 26px; margin-bottom: 15px; line-height: 1.2; }
.bt-product.bt-installation #main h3 { font-size: 20px; margin-bottom: 10px; }
.bt-product.bt-installation #main strong { color: #28343e; }
.bt-guide-intro { padding: 0 0 30px; max-width: 840px; }
.bt-product.bt-installation #main .bt-guide-intro>p:not(.bt-eyebrow) { font-size: 15px; max-width: 650px; margin-top: 20px; }
.bt-guide-steps { display: flex; flex-wrap: wrap; list-style: none; padding: 0; margin: 27px 0 0; gap: 0; }
.bt-guide-steps li { display: flex; align-items: center; gap: 9px; font-size: 11px; font-weight: 700; padding: 0 23px; border-right: 1px solid #cfdce3; }
.bt-guide-steps li:first-child { padding-left: 0; }
.bt-guide-steps li:last-child { border: 0; }
.bt-guide-steps span { color: #007d96; font-size: 10px; letter-spacing: .05em; }
.bt-guide-prerequisite { display: flex; gap: 15px; padding: 20px 24px; margin: 0 0 30px; border: 1px solid #d1e2e9; border-left: 3px solid #18879f; background: #eef5f8; border-radius: 3px; }
.bt-guide-prerequisite strong { display: block; font-size: 13px; margin-bottom: 4px; }
.bt-product.bt-installation #main .bt-guide-prerequisite p { font-size: 12px; margin: 0; }
.bt-guide-proof-icon { flex-shrink: 0; display: flex; align-items: center; justify-content: center; width: 23px; height: 23px; border-radius: 50%; border: 1px solid #a9cad6; background: #fff; color: #007d96; margin-top: 2px; font-size: 12px; }
.bt-guide-columns { display: grid; grid-template-columns: 1.12fr 1fr; gap: 28px; align-items: start; }
.bt-guide-card { min-width: 0; padding: 30px; border: 1px solid #d7e1e7; border-radius: 5px; background: #fff; box-shadow: 0 6px 20px #25475a06; }
.bt-guide-columns>.bt-guide-card { border-top: 3px solid #16869e; padding-top: 28px; }
.bt-guide-next { display: grid; gap: 24px; min-width: 0; }
.bt-guide-next .bt-guide-card { background: #f8fafb; box-shadow: none; }
.bt-product.bt-installation #main .bt-guide-next p+p { margin-top: 16px; }
.bt-guide-form { display: grid; margin-top: 24px; gap: 6px; }
.bt-guide-form label { color: #28343e; font-size: 12px; font-weight: 700; }
.bt-guide-form input, .bt-guide-form select, .bt-guide-result textarea { appearance: auto; width: 100%; min-width: 0; border: 1px solid #bdcdd6; border-radius: 3px; background: #fbfdfe; color: #28343e; padding: 11px 12px; font: inherit; font-size: 13px; line-height: 1.5; }
.bt-guide-form input::placeholder { color: #8298a4; }
.bt-guide-form select { padding-right: 8px; }
.bt-product.bt-installation #main .bt-guide-help { color: #687d89; font-size: 11px; line-height: 1.8; margin: 2px 0 16px; }
.bt-guide-button { justify-self: start; display: inline-flex; justify-content: center; align-items: center; padding: 12px 22px; background: #087f96; color: #fff; border: 1px solid #087f96; border-radius: 4px; box-shadow: 0 3px 0 #006b7f; font: inherit; font-weight: 700; font-size: 12px; line-height: 1.5; cursor: pointer; }
.bt-guide-button:hover { background: #006a80; }
.bt-guide-button-secondary { background: #fff; color: #007d96; box-shadow: none; margin-top: 12px; }
.bt-guide-button-secondary:hover { background: #edf6f9; }
.bt-guide-button:disabled { opacity: .55; cursor: not-allowed; }
.bt-product.bt-installation [hidden] { display: none !important; }
.bt-guide-result { margin-top: 30px; border-top: 1px solid #d7e1e7; padding-top: 25px; overflow-wrap: anywhere; }
.bt-guide-code-label { display: block; font-size: 11px; font-weight: 700; margin: 15px 0 8px; }
.bt-product.bt-installation #main #tracking-code { display: block; font: 11px/1.8 ui-monospace, "Cascadia Code", monospace; color: #284c5d; background: #f0f6f8; resize: vertical; min-height: 200px; padding: 15px; }
.bt-product.bt-installation #main .bt-guide-error { padding: 12px 15px; background: #fff3f1; color: #9a382d; border-left: 3px solid #c65b4a; margin-top: 18px; }
.bt-check-list { list-style: decimal; padding-left: 18px; margin: 18px 0; }
.bt-check-list li { padding-left: 4px; color: #65747e; font-size: 12px; line-height: 1.85; }
.bt-check-list li+li { margin-top: 10px; }
.bt-check-list li::marker { color: #007d96; font-weight: 700; }
.bt-guide-text-link { display: inline-block; margin-top: 19px; font-size: 12px; font-weight: 700; }
.bt-guide-troubleshooting { margin-top: 30px; padding-top: 27px; }
.bt-guide-troubleshooting details { padding: 16px 0; border-bottom: 1px solid #dce5ea; }
.bt-guide-troubleshooting summary { cursor: pointer; font-size: 13px; line-height: 1.7; font-weight: 700; list-style: disclosure-closed inside; }
.bt-guide-troubleshooting details[open] summary { list-style-type: disclosure-open; }
.bt-product.bt-installation #main .bt-guide-troubleshooting details p { max-width: 900px; margin: 12px 0 0; font-size: 12px; }
.bt-product.bt-installation #main .bt-guide-troubleshooting>p:last-child { font-size: 11px; margin-top: 20px; }
@media (max-width: 760px) {
    .bt-product.bt-installation #main { padding: 35px 24px 45px; }
    .bt-product.bt-installation #main h1 { font-size: 43px; }
    .bt-product.bt-installation #main .bt-guide-intro>p:not(.bt-eyebrow) { font-size: 13px; }
    .bt-guide-steps { gap: 10px 0; margin-top: 21px; }
    .bt-guide-steps li { font-size: 10px; padding-inline: 12px; gap: 6px; }
    .bt-guide-prerequisite { padding: 16px; gap: 11px; margin-bottom: 24px; }
    .bt-product.bt-installation #main .bt-guide-prerequisite p { font-size: 11px; }
    .bt-guide-columns { grid-template-columns: 1fr; gap: 24px; }
    .bt-guide-card { padding: 24px; }
    .bt-guide-columns>.bt-guide-card { padding-top: 23px; }
    .bt-guide-next { grid-template-columns: 1fr 1fr; gap: 18px; }
    .bt-product.bt-installation #main .bt-guide-next h2 { font-size: 21px; }
    .bt-product.bt-installation #main .bt-guide-next p, .bt-check-list li { font-size: 11px; }
    .bt-guide-next .bt-guide-card { padding: 20px; }
}
@media (max-width: 540px) {
    .bt-guide-next { grid-template-columns: 1fr; gap: 22px; }
    .bt-product.bt-installation #main .bt-guide-next h2 { font-size: 24px; }
    .bt-product.bt-installation #main .bt-guide-next p, .bt-check-list li { font-size: 12px; }
}
@media (max-width: 380px) {
    .bt-product.bt-installation #main { padding-inline: 18px; }
    .bt-product.bt-installation #main h1 { font-size: 36px; }
    .bt-product.bt-installation #main h2 { font-size: 24px; }
    .bt-guide-steps li { font-size: 9px; padding-inline: 8px; gap: 4px; }
    .bt-guide-steps span { font-size: 8px; }
    .bt-guide-card, .bt-guide-next .bt-guide-card { padding: 20px; }
    .bt-guide-prerequisite { padding: 14px 12px; gap: 8px; }
    .bt-guide-proof-icon { width: 18px; height: 18px; font-size: 10px; }
    .bt-guide-prerequisite strong { font-size: 12px; }
    .bt-product.bt-installation #main .bt-guide-help { font-size: 10px; }
    .bt-guide-form select { font-size: 11px; }
    .bt-product.bt-installation #main #tracking-code { font-size: 10px; padding: 11px; }
}