:root { --panel-bg:#f5f7fa; --card-border:#e5e7eb; }
body { background:var(--panel-bg); color:#172033; }
.navbar-brand { font-weight:700; letter-spacing:-.02em; }
.card { border:1px solid var(--card-border); border-radius:1rem; box-shadow:0 8px 30px rgba(18,38,63,.05); }
.mailbox-card { transition:transform .12s ease, box-shadow .12s ease; }
.mailbox-card:hover { transform:translateY(-1px); box-shadow:0 10px 30px rgba(18,38,63,.08); }
.progress { height:.55rem; background:#e9edf3; }
.form-control,.form-select,.btn { border-radius:.7rem; }
.muted-label { font-size:.78rem; text-transform:uppercase; letter-spacing:.06em; color:#76839a; font-weight:700; }
.setting-value { font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace; word-break:break-all; }