:root{--sed-navy:#0a2a4e;--sed-navy-soft:#315b82;--sed-amber:#f4a914;--sed-bg:#f7fafc;--sed-line:#dce6ef;--sed-success:#169b62;--sed-danger:#d94242}*{box-sizing:border-box}body.sed-brand{font-family:Inter,ui-rounded,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--sed-navy);background:var(--sed-bg) url('/assets/brand/istanbul-alaturka-background.webp') center bottom/cover fixed no-repeat;min-height:100vh}.sed-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.sed-card{width:min(100%,720px);background:#fffffff2;border:1px solid var(--sed-line);border-radius:28px;padding:clamp(22px,4vw,42px);box-shadow:0 20px 60px #0a2a4e14;backdrop-filter:blur(8px)}.sed-logo{display:block;max-width:min(100%,520px);max-height:210px;margin:0 auto 18px}.sed-title{text-align:center;font-size:clamp(28px,5vw,46px);margin:0 0 8px}.sed-lead{text-align:center;font-size:18px;line-height:1.6;color:#47647f}.sed-primary{display:inline-flex;align-items:center;justify-content:center;min-height:58px;padding:0 24px;border-radius:18px;background:var(--sed-navy);color:#fff;text-decoration:none;font-weight:900}.sed-muted{color:#678199}.sed-skyline{width:100%;max-height:220px;object-fit:contain;opacity:.45;margin-top:20px}@media(max-width:600px){.sed-shell{padding:12px}.sed-card{border-radius:20px;padding:20px}.sed-logo{max-height:140px}}