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@media(max-width:390px){.shell{padding-inline:17px}.header-inner{padding-inline:17px;gap:10px}.brand{width:132px}.header-divider{display:none}.help-brand{font-size:9px;max-width:45px;line-height:1.5}.header-actions .button{font-size:9px;padding:8px 9px;gap:8px}.hero-copy h1{font-size:38px}.hero-copy>p{font-size:12px}.hero-actions{gap:17px}.hero-actions>.button{font-size:11px;padding:12px 15px;gap:14px}.hero-actions>.text-link{font-size:10px}.hero-meta{font-size:7px;gap:5px}.hero-diagram{padding:25px 19px 18px;min-height:355px}.diagram-source{width:94%;padding:13px}.diagram-source small{font-size:6px}.diagram-gateway{padding:18px 14px;gap:11px}.diagram-gateway strong{font-size:13px}.gateway-envelope{width:35px;height:35px}.gateway-spark{font-size:24px}.diagram-destination{width:94%;padding:12px 13px}.diagram-destination strong{font-size:9px}.diagram-destination small{font-size:6px}.section-heading h2{font-size:25px}.section-heading{gap:9px}.guide-count{font-size:7px;padding-inline:5px}.guide-grid{gap:10px}.guide-card{padding:17px 14px 14px;min-height:239px}.guide-card h3{font-size:16px}.guide-card p{font-size:9px}.card-bottom{font-size:7px}.card-badge{font-size:6px}.category-filter{font-size:9px;padding:5px 8px}.settings-top{padding:18px 16px;gap:9px}.settings-top h3{font-size:13px}.settings-list{padding-inline:16px}.settings-list dd{gap:5px}.settings-list code{font-size:8px}.copy-button{font-size:7px;padding:4px 5px}.settings-bottom{padding-inline:16px}.help-bottom:before{inset-inline:17px}.help-bottom h2{font-size:24px}.help-bottom>div{padding-left:48px}.help-bottom>.button{margin-left:48px}.article-heading h1{font-size:30px}.article-heading>p{font-size:12px}.scope-card{padding:15px;gap:10px}.scope-card p{font-size:10px}.prerequisites{padding:19px}.prerequisites li{font-size:11px}.guide-step{padding:20px 17px}.step-heading h2{font-size:18px}.step-heading{gap:10px}.step-text,.step-bullets{font-size:11px}.step-tip{font-size:9px;padding:11px}.visual-body{padding:16px 13px}.visual-value code{font-size:9px}.visual-flow{flex-direction:column;gap:7px}.flow-item{flex-direction:row;text-align:left;padding:11px;font-size:10px;justify-content:flex-start}.flow-arrow{transform:rotate(90deg);height:13px}.related-list{grid-template-columns:1fr}.related-link{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}

/* Comfortable reading contrast for long-form setup instructions. */
.mobile-platform-select{display:none}.platform-icon.thunderbird{background:#edf5ff;color:#498bcc;border-color:#daeafa;font-size:14px}
.guide-card p{font-size:12px;color:#52637b}.card-bottom{font-size:11px}.principle p{font-size:12px;color:#52637b}.principle h2{font-size:14px}.section-heading p{font-size:14px}.category-filter{font-size:12px}.search-bar input{font-size:14px}.search-hint{font-size:10px}.quick-copy>p{font-size:14px}.quick-note{font-size:11px}.settings-list dt{font-size:11px;color:#52637b}.settings-list dd,.settings-list code{font-size:12px;color:#314967}.settings-top div>span,.settings-bottom{font-size:10px}.copy-button{font-size:10px}.help-bottom p{font-size:12px}.article-heading>p{color:#52637b;font-size:15px}.article-meta{font-size:10px}.scope-card h2{font-size:13px;color:#10203d}.scope-card p{font-size:13px;color:#415a78}.prerequisites li{font-size:14px;color:#52637b}.step-text,.step-bullets{font-size:14px;color:#52637b}.step-tip{font-size:12px;color:#415a78}.step-tip.warning{color:#906a32}.step-tip.success{color:#4a7c63}.visual-field>span{font-size:11px;color:#52637b}.visual-value code{font-size:12px;color:#314967}.visual h3{font-size:14px;color:#10203d}.visual-caption{font-size:10px;color:#52637b}.visual-chrome>span{font-size:9px}.path-item{font-size:12px;color:#415a78}.flow-item{font-size:12px;color:#415a78}.code-example pre{font-size:12px}.troubleshooting summary{font-size:14px;color:#314967}.troubleshooting details p{font-size:14px;color:#52637b}.guide-sources>p,.guide-sources a{font-size:12px;color:#52637b}.article-end p{font-size:12px;color:#52637b}.guide-nav a{font-size:12px}.toc-nav a{font-size:11px;color:#52637b}.sidebar-cta p{font-size:11px}.sidebar-cta strong{font-size:12px}.sidebar-cta a{font-size:11px}.guide-nav .platform-icon.thunderbird{font-size:9px}.related-link{font-size:12px}
@media(max-width:850px) and (min-width:651px){.guide-nav a{font-size:10px}.toc-nav a{font-size:10px}.scope-card p{font-size:12px}.step-text,.step-bullets,.prerequisites li{font-size:13px}.visual-value code{font-size:11px}.visual-flow{flex-direction:column}.flow-item{flex-direction:row;padding:12px;text-align:left;justify-content:flex-start}.flow-arrow{transform:rotate(90deg);height:14px}}
@media(max-width:650px){.mobile-platform-select{display:grid;gap:7px;margin-bottom:25px}.mobile-platform-select>span{font-size:10px;color:#526780}.mobile-platform-select select{appearance:auto;width:100%;border:1px solid #e2eafb;background:#fff;color:#314967;font:inherit;font-size:12px;padding:11px 12px;border-radius:9px}.mobile-platform-select select:focus-visible{outline:3px solid #ffb11f;outline-offset:3px;box-shadow:0 0 0 1px #0a2ca2}.guide-card p{font-size:11px;color:#52637b}.guide-card h3{font-size:18px}.card-bottom{font-size:9px}.card-badge{font-size:7px}.principle p{font-size:12px}.section-heading p{font-size:12px}.category-filter{font-size:11px}.quick-copy>p{font-size:13px}.settings-list dd,.settings-list code{font-size:11px}.copy-button{font-size:9px}.settings-list dd{flex-wrap:wrap}.settings-list code{max-width:100%}.settings-list dt{font-size:10px}.article-heading>p{font-size:14px}.article-meta{font-size:9px}.scope-card p{font-size:12px}.prerequisites li,.step-text,.step-bullets{font-size:14px;line-height:1.95}.step-tip{font-size:12px}.visual-value code{font-size:11px}.visual-field>span{font-size:10px}.visual-caption{font-size:9px}.visual-chrome>span{font-size:8px}.path-item{font-size:11px}.visual-flow{flex-direction:column;gap:7px}.flow-item{flex-direction:row;text-align:left;padding:12px;font-size:11px;justify-content:flex-start}.flow-arrow{transform:rotate(90deg);height:14px}.article-mobile-toc summary{font-size:12px}.article-mobile-toc a{font-size:12px}.troubleshooting summary,.troubleshooting details p{font-size:13px}.guide-sources>p,.guide-sources a{font-size:11px}.related-link{font-size:11px}}
@media(max-width:390px){.guide-grid{grid-template-columns:1fr}.guide-card{min-height:190px;padding:22px}.card-top{flex-direction:row;align-items:center}.guide-card h3{font-size:20px}.guide-card p{font-size:12px}.card-bottom{font-size:10px}.card-badge{font-size:8px}.settings-list code{font-size:10px}.step-text,.step-bullets,.prerequisites li{font-size:13px}}

/* Keep instructions and copied settings readable at every viewport size. */
.hero-meta,.card-badge,.guide-count,.category-filter,.settings-top div>span,.settings-bottom,.article-meta,.article-breadcrumb,.visual-caption,.guide-sources>p,.guide-sources a,.footer-bottom,.site-footer>div>p{font-size:11px}
.guide-card p{font-size:14px;line-height:1.8}.card-bottom{font-size:12px}.guide-card{min-height:260px}.card-badge{font-size:10px}.principle p{font-size:13px}.settings-list dd,.settings-list code{font-size:13px}.settings-list dt{font-size:12px}.copy-button{font-size:11px}.quick-note{font-size:12px}.visual-value code{font-size:13px}.visual-field>span{font-size:12px}.visual-chrome>span{font-size:10px}.path-item,.flow-item{font-size:13px}.code-example pre{font-size:13px}.code-title,.code-title button{font-size:11px}.article-end p{font-size:14px}.help-bottom p{font-size:13px}.sidebar-title,.steps-heading{font-size:10px}.article-mobile-toc a{font-size:13px}.hero-copy>.eyebrow,.section-heading .eyebrow,.quick-copy>.eyebrow{font-size:10px}.site-footer>nav{font-size:12px}
@media(max-width:850px) and (min-width:651px){.hero-meta{font-size:10px}.step-text,.step-bullets,.prerequisites li{font-size:14px}.settings-list code{font-size:12px}.settings-list dd{flex-wrap:wrap}.settings-top div>span,.settings-bottom{font-size:11px}.quick-copy>p{font-size:14px}}
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@media(max-width:390px){.guide-card{min-height:210px}.guide-card p{font-size:14px}.card-badge{font-size:10px}.card-bottom{font-size:12px}.settings-list code{font-size:13px}.step-text,.step-bullets,.prerequisites li{font-size:14px}}

/* Local platform marks: shared by the guide navigation, cards and article titles. */
.platform-icon{overflow:hidden}
.platform-icon img{display:block;width:70%;height:70%;max-width:100%;object-fit:contain}
.platform-icon.gmail img{width:72%;height:66%}
.platform-icon.plesk img{width:84%;height:70%}
.platform-icon.cpanel img{width:82%;height:72%}
.guide-nav .platform-icon{width:34px;height:34px;border-radius:9px}
.guide-nav .platform-icon svg{width:22px;height:22px}
.guide-nav a{gap:12px;min-height:51px}
.article-heading-top .platform-icon{width:54px;height:54px;border-radius:14px}
.related-link .platform-icon{width:34px;height:34px;border-radius:9px}
.footer-brand-image{display:block;width:205px;line-height:0}
.footer-brand-image img{display:block;width:100%;height:auto;aspect-ratio:2170/725;object-fit:contain}
@media(max-width:900px) and (min-width:651px){.guide-nav .platform-icon{width:30px;height:30px;border-radius:8px}.guide-nav a{gap:9px}}
@media(max-width:650px){.footer-brand-image{width:180px}.article-heading-top .platform-icon{width:49px;height:49px}.related-link .platform-icon{width:32px;height:32px}}
/* Downloadable API integrations share the established BEF palette. */
.guide-downloads{margin:24px 0;padding:26px;border:1px solid #dbe3fa;border-radius:22px;background:linear-gradient(120deg,#f5f8ff,#fff);display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}.guide-downloads h2{font-size:22px;margin:7px 0;color:#000052}.guide-downloads p{margin:0;color:#657897}.download-links{display:flex;flex-wrap:wrap;gap:10px}.download-links .button{font-size:13px;max-width:100%;white-space:normal}.platform-icon.wisecp-api{color:#102ca6;background:#edf2ff}@media(max-width:640px){.guide-downloads{padding:20px}.download-links,.download-links .button{width:100%}}