.smtp-detail{padding:40px 0 8px}.smtp-detail .container{max-width:780px}.sd-crumbs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:13px;color:var(--fg-muted);margin-bottom:28px}.sd-crumbs a{color:var(--fg-muted);transition:color .12s}.sd-crumbs a:hover{color:var(--fg-primary)}.sd-crumbs [data-lucide]{width:13px;height:13px;color:var(--fg-subtle)}.sd-crumbs [aria-current]{color:var(--fg-body);font-weight:600;font-family:var(--font-mono)}.sd-head{margin-bottom:28px}.sd-head-meta{display:flex;align-items:center;gap:10px;margin-bottom:14px}.sd-kind{font-size:11px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent-primary);background:var(--accent-primary-a);padding:4px 10px;border-radius:999px}.sd-sev{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:600;color:var(--fg-muted);padding:4px 10px;border-radius:999px;box-shadow:inset 0 0 0 1px var(--card-border)}.sd-sev .smtp-dot{width:8px;height:8px;border-radius:50%}.sd-sev.is-ok .smtp-dot{background:var(--accent-success)}.sd-sev.is-warn .smtp-dot{background:var(--accent-warning)}.sd-sev.is-bad .smtp-dot{background:var(--accent-secondary)}.sd-head h1{font-size:38px;line-height:1.1;font-weight:700;letter-spacing:-.02em;color:var(--fg-primary);margin:0 0 10px;font-family:var(--font-mono)}.sd-sub{font-size:19px;line-height:27px;color:var(--fg-body);margin:0 0 12px;text-wrap:pretty}.sd-updated{font-size:13px;color:var(--fg-subtle);margin:0}.sd-tldr{background:var(--card-bg);box-shadow:inset 0 0 0 1.5px var(--accent-primary);border-radius:var(--r-card);padding:24px 26px;margin-bottom:20px}.sd-tldr-lbl{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-primary);margin-bottom:10px}.sd-tldr-lbl [data-lucide]{width:14px;height:14px}.sd-tldr>p{font-size:16px;line-height:25px;color:var(--fg-body);margin:0}.sd-tldr-fix{margin-top:16px;padding-top:16px;border-top:1px solid var(--card-border)}.sd-tldr-fix-lbl{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--fg-subtle);margin-bottom:5px}.sd-tldr-fix-lbl [data-lucide]{width:12px;height:12px}.sd-tldr-fix p{font-size:14.5px;line-height:22px;color:var(--fg-muted);margin:0}.sd-verdict{display:flex;align-items:flex-start;gap:10px;font-size:14px;line-height:21px;color:var(--fg-body);background:var(--card-bg-raised);box-shadow:inset 0 0 0 1px var(--card-border);border-radius:12px;padding:14px 16px;margin-bottom:20px}.sd-verdict b{color:var(--fg-primary)}.sd-verdict .smtp-dot{width:9px;height:9px;border-radius:50%;flex-shrink:0;margin-top:6px}.sd-verdict.is-warn .smtp-dot{background:var(--accent-warning)}.sd-verdict.is-bad .smtp-dot{background:var(--accent-secondary)}.sd-verdict.is-ok .smtp-dot{background:var(--accent-success)}.sd-verdict [data-lucide]{width:16px;height:16px;color:var(--accent-primary);flex-shrink:0;margin-top:3px}.sd-block{margin-top:34px}.sd-block h2{font-size:22px;line-height:1.25;font-weight:700;letter-spacing:-.01em;color:var(--fg-primary);margin:0 0 16px}.sd-block>p{font-size:15.5px;line-height:26px;color:var(--fg-body);margin:0}.sd-causes{display:flex;flex-direction:column;gap:12px}.sd-cause{background:var(--card-bg);box-shadow:inset 0 0 0 1px var(--card-border);border-radius:12px;padding:16px 18px}.sd-cause-title{font-size:15px;font-weight:600;color:var(--fg-primary);margin-bottom:5px}.sd-cause p{font-size:14px;line-height:21px;color:var(--fg-muted);margin:0}.sd-steps{list-style:none;counter-reset:sd;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}.sd-steps li{counter-increment:sd;position:relative;background:var(--card-bg);box-shadow:inset 0 0 0 1px var(--card-border);border-radius:12px;padding:18px 20px 18px 58px}.sd-steps li:before{content:counter(sd);position:absolute;left:18px;top:18px;width:26px;height:26px;border-radius:50%;background:var(--accent-primary);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700;font-family:var(--font-ui)}.sd-step-title{font-size:15px;font-weight:600;color:var(--fg-primary);margin-bottom:5px}.sd-steps p{font-size:14px;line-height:21px;color:var(--fg-muted);margin:0}.sd-code{margin:12px 0 0;padding:12px 14px;overflow-x:auto;background:var(--input-bg);box-shadow:inset 0 0 0 1px var(--card-border);border-radius:8px;font-family:var(--font-mono);font-size:12.5px;line-height:1.7;color:var(--fg-body)}.sd-pair-note{font-size:14px;line-height:21px;color:var(--fg-muted);margin:0 0 14px}.sd-related{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}.sd-rel-card{display:flex;align-items:center;gap:12px;background:var(--card-bg);box-shadow:inset 0 0 0 1px var(--card-border);border-radius:12px;padding:12px 14px;transition:box-shadow .12s,background .12s,transform .12s}.sd-rel-card:hover{box-shadow:inset 0 0 0 1px var(--accent-primary);background:var(--card-bg-raised);transform:translateY(-1px)}.sd-rel-mean{font-size:13px;line-height:18px;color:var(--fg-body)}.sd-faqs{display:flex;flex-direction:column;gap:10px}.sd-faq{background:var(--card-bg);box-shadow:inset 0 0 0 1px var(--card-border);border-radius:12px;overflow:hidden}.sd-faq summary{list-style:none;cursor:pointer;user-select:none;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:16px 18px;font-size:15px;font-weight:600;color:var(--fg-primary)}.sd-faq summary::-webkit-details-marker{display:none}.sd-faq-chev{width:17px;height:17px;color:var(--fg-muted);flex-shrink:0;transition:transform .2s}.sd-faq[open] .sd-faq-chev{transform:rotate(180deg)}.sd-faq p{margin:0;padding:0 18px 18px;font-size:14px;line-height:22px;color:var(--fg-muted)}.sd-back{margin-top:36px}.sd-back a{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--accent-primary);transition:gap .12s}.sd-back a:hover{gap:11px}.sd-back [data-lucide]{width:15px;height:15px}@media(max-width:760px){.sd-head h1{font-size:30px}.sd-sub{font-size:17px}.sd-tldr{padding:20px}}@media(prefers-reduced-motion:reduce){.sd-rel-card,.sd-back a,.sd-faq-chev{transition:none}}