/* Video 3: giao diện Admin tách biệt hoàn toàn với giao diện User */
.admin-body { background: #f4f5f7; }

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

.admin-sidebar {
    width: 250px;
    flex-shrink: 0;
    background: #1c1f26;
    color: #fff;
    display: flex;
    flex-direction: column;
    padding: 1.5rem 1rem;
}

.admin-brand {
    color: #fff;
    text-decoration: none;
    font-weight: 800;
    letter-spacing: .5px;
    font-size: 1.15rem;
    margin-bottom: 2rem;
    display: block;
}
.admin-brand small { display: block; font-weight: 500; opacity: .6; font-size: .7rem; }

.admin-nav { display: flex; flex-direction: column; gap: .25rem; flex: 1; }

.admin-nav-link {
    color: #b8bcc6;
    text-decoration: none;
    padding: .65rem .9rem;
    border-radius: .5rem;
    font-weight: 500;
    font-size: .92rem;
}
.admin-nav-link:hover { background: #2a2e38; color: #fff; }
.admin-nav-link.active { background: var(--brand, #e53935); color: #fff; }

.admin-logout { margin-top: auto; }

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

.admin-topbar {
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.admin-content { padding: 1.75rem; }

.admin-auth-body {
    background: #f4f5f7;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.admin-auth-shell { width: 100%; max-width: 480px; padding: 2rem; }