body {
    background: #edf1f7;
    color: #1f2937;
}

.admin-shell {
    min-height: 100vh;
}

.admin-background {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at top left, rgba(15, 23, 42, 0.08), transparent 35%),
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.12), transparent 28%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.55), rgba(255, 255, 255, 0.9));
    pointer-events: none;
    z-index: -1;
}

.admin-layout {
    display: flex;
    min-height: 100vh;
    padding: 0;
}

.admin-sidebar {
    width: 280px;
    background: rgba(15, 23, 42, 0.96);
    color: #fff;
    display: flex;
    flex-direction: column;
    padding: 24px;
    gap: 24px;
}

.admin-main {
    flex: 1;
    min-width: 0;
}

.admin-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 24px 28px;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(15, 23, 42, 0.08);
}

.brand-block {
    display: flex;
    align-items: center;
    gap: 14px;
}

.brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #fff, #cbd5e1);
    color: #0f172a;
    font-weight: 800;
    letter-spacing: 0.08em;
}

.brand-title {
    font-size: 1.05rem;
    font-weight: 700;
}

.brand-subtitle {
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.85rem;
}

.sidebar-nav .nav-link {
    color: rgba(255, 255, 255, 0.8);
    border-radius: 14px;
    padding: 12px 14px;
    margin-bottom: 6px;
}

.sidebar-nav .nav-link:hover,
.sidebar-nav .nav-link.active {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.admin-card,
.stat-card,
.empty-state,
.login-card {
    border-radius: 22px;
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

.admin-card .card-header {
    border-top-left-radius: 22px;
    border-top-right-radius: 22px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.85);
    padding: 22px;
    border: 1px solid rgba(15, 23, 42, 0.06);
}

.stat-label {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #64748b;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    margin-top: 8px;
}

.empty-state,
.empty-inline {
    background: rgba(255, 255, 255, 0.8);
    border: 1px dashed rgba(100, 116, 139, 0.28);
    padding: 24px;
}

.empty-state {
    text-align: center;
}

.participant-row,
.claim-row,
.history-row {
    padding: 12px 0;
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.participant-row:last-child,
.claim-row:last-child,
.history-row:last-child {
    border-bottom: 0;
    padding-bottom: 0;
}

.admin-tabs .nav-link {
    color: #334155;
    border-radius: 999px;
    padding: 10px 16px;
}

.admin-tabs .nav-link.active {
    background: #0f172a;
    color: #fff;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        radial-gradient(circle at top left, rgba(15, 23, 42, 0.12), transparent 30%),
        linear-gradient(180deg, #f8fafc, #e2e8f0);
}

.login-card {
    width: min(100%, 460px);
    background: rgba(255, 255, 255, 0.9);
}

@media (max-width: 991px) {
    .admin-layout {
        display: block;
    }

    .admin-sidebar {
        width: 100%;
    }

    .admin-topbar {
        padding: 18px 20px;
    }
}