:root {
    color-scheme: dark;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #0b0f14;
    color: #edf2f7;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at top, #132335, #0b0f14 48%); }
.centered { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.container { width: min(1120px, calc(100% - 40px)); margin: 48px auto; }
.topbar { display: flex; align-items: center; justify-content: space-between; padding: 18px 28px; border-bottom: 1px solid #243241; background: rgba(11, 15, 20, .88); }
.brand { color: #65d8ff; font-size: 1.05rem; font-weight: 800; letter-spacing: .04em; text-decoration: none; text-transform: uppercase; }
.card { background: rgba(21, 29, 39, .94); border: 1px solid #2a3a4a; border-radius: 16px; padding: 28px; box-shadow: 0 18px 70px rgba(0, 0, 0, .3); }
.login-card { width: min(440px, 100%); }
h1 { margin: 12px 0 8px; font-size: clamp(1.75rem, 4vw, 2.4rem); }
h2 { margin: 14px 0 8px; }
.muted { color: #a8b4c1; }
label { display: block; margin: 18px 0 7px; color: #cbd5df; font-weight: 650; }
input, select { width: 100%; border: 1px solid #3b4b5d; border-radius: 9px; padding: 12px 13px; background: #0c131b; color: #fff; font: inherit; }
input:focus, select:focus { outline: 3px solid rgba(56, 189, 248, .25); border-color: #38bdf8; }
button { margin-top: 22px; width: 100%; border: 0; border-radius: 9px; padding: 12px 16px; background: #16a3d4; color: #041016; font: inherit; font-weight: 800; cursor: pointer; }
button:hover { background: #65d8ff; }
button.secondary { margin: 0; width: auto; background: transparent; color: #dbe7f1; border: 1px solid #3b4b5d; }
.alert { margin-top: 18px; padding: 12px; border: 1px solid #7f1d1d; border-radius: 9px; background: #3b1117; color: #fecaca; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-top: 32px; }
.status { display: inline-flex; padding: 5px 9px; border-radius: 999px; background: #253242; color: #c9d4df; font-size: .8rem; font-weight: 750; }
.status-ok { background: #123c2b; color: #86efac; }
.nav { display: flex; gap: 18px; margin-left: auto; margin-right: 24px; }
.nav a, .back-link { color: #b8c7d6; text-decoration: none; }
.nav a:hover, .back-link:hover { color: #65d8ff; }
.page-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.button-link { display: inline-flex; width: auto; margin-top: 12px; border-radius: 9px; padding: 10px 14px; background: #16a3d4; color: #041016; font-weight: 800; text-decoration: none; }
.button-link:hover { background: #65d8ff; }
.notice { margin: 22px 0; padding: 13px; border: 1px solid #166534; border-radius: 9px; background: #123c2b; color: #bbf7d0; }
.table-wrap { margin-top: 26px; overflow-x: auto; border: 1px solid #2a3a4a; border-radius: 14px; }
table { width: 100%; border-collapse: collapse; background: rgba(21, 29, 39, .94); }
th, td { padding: 15px 18px; border-bottom: 1px solid #2a3a4a; text-align: left; }
th { color: #a8b4c1; font-size: .8rem; text-transform: uppercase; }
tr:last-child td { border-bottom: 0; }
.empty-state { margin-top: 28px; text-align: center; }
.form-page { width: min(680px, 100%); margin: 0 auto; }
.form-card { margin-top: 18px; }
.field-help { margin: 7px 0 0; color: #8fa0b1; font-size: .9rem; }
@media (max-width: 720px) {
    .topbar { align-items: flex-start; flex-wrap: wrap; }
    .nav { order: 3; width: 100%; margin: 12px 0 0; }
    .page-heading { align-items: flex-start; flex-direction: column; }
}