:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #17202a; background: #f3f5f7; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
.shell { width: min(1180px, calc(100% - 32px)); margin: 0 auto; padding: 32px 0 48px; }
.panel { background: #fff; border: 1px solid #dce2e8; border-radius: 6px; padding: 24px; }
.narrow { max-width: 420px; margin: 10vh auto 0; }
h1, h2 { margin: 0 0 16px; }
h1 { font-size: 26px; }
h2 { font-size: 18px; }
.muted { color: #687581; font-size: 14px; }
form { display: grid; gap: 14px; }
label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; }
input, select { width: 100%; border: 1px solid #c8d0d8; border-radius: 4px; padding: 10px 11px; font: inherit; background: #fff; }
select[multiple] { min-height: 120px; }
button { border: 0; border-radius: 4px; padding: 10px 14px; color: #fff; background: #1769aa; font: inherit; font-weight: 600; cursor: pointer; }
button:hover { background: #125487; }
button:disabled { opacity: .55; cursor: wait; }
button.quiet { padding: 7px 10px; color: #375466; background: #e7eef3; }
.hidden { display: none !important; }
.error { min-height: 20px; margin: 0; color: #b42318; font-size: 14px; }
.message { min-height: 20px; margin: 0; color: #17633c; font-size: 14px; }
.topbar { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #dce2e8; padding: 0 0 16px; }
.topbar strong { font-size: 20px; }
.toolbar { display: flex; gap: 12px; align-items: end; padding: 20px 0; }
.select-label { width: min(360px, 100%); }
.mail-layout { display: grid; grid-template-columns: minmax(260px, 360px) 1fr; gap: 16px; min-height: 560px; }
.mail-list { display: grid; align-content: start; gap: 8px; }
.mail-item { background: #fff; border: 1px solid #dce2e8; border-radius: 5px; padding: 14px; cursor: pointer; }
.mail-item.active { border-color: #1769aa; box-shadow: inset 3px 0 #1769aa; }
.mail-item strong, .mail-item span { display: block; overflow-wrap: anywhere; }
.mail-item strong { margin-bottom: 5px; }
.mail-item span { color: #687581; font-size: 13px; }
.mail-detail { background: #fff; border: 1px solid #dce2e8; border-radius: 5px; padding: 22px; overflow-wrap: anywhere; }
.mail-detail h2 { margin-bottom: 8px; }
.mail-detail pre { white-space: pre-wrap; font: inherit; line-height: 1.55; }
.admin-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 20px 0; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 9px 8px; border-bottom: 1px solid #e6eaee; text-align: left; vertical-align: top; }
@media (max-width: 760px) { .mail-layout, .admin-grid { grid-template-columns: 1fr; } .toolbar { align-items: stretch; flex-direction: column; } }