body {
    background: #f5f7fb;
    font-size: 14px;
    color: #1f2937;
}
.app-shell {
    display: flex;
    min-height: 100vh;
}
.sidebar-area {
    width: 250px;
    background: #111827;
    color: #fff;
}
.main-area {
    flex: 1;
}
.topbar {
    padding: 12px 20px;
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
}
.page-body {
    padding: 20px;
}
.sidebar-brand {
    padding: 18px 16px;
    font-weight: 700;
    border-bottom: 1px solid rgba(255,255,255,.1);
}
.sidebar-nav {
    list-style: none;
    margin: 0;
    padding: 10px 0;
}
.sidebar-nav li a {
    display: block;
    color: #e5e7eb;
    text-decoration: none;
    padding: 10px 16px;
}
.sidebar-nav li a:hover {
    background: #1f2937;
}
.sidebar-nav .section {
    padding: 14px 16px 8px;
    font-size: 12px;
    text-transform: uppercase;
    color: #9ca3af;
}
.card {
    border: 0;
    box-shadow: 0 2px 10px rgba(15,23,42,.06);
}
.stat-box {
    color: #fff;
    padding: 20px 14px;
    border-radius: 8px;
    margin-bottom: 15px;
}
.stat-box .count {
    font-size: 28px;
    font-weight: bold;
}
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-card {
    width: 420px;
    background: #fff;
    border-radius: 10px;
    padding: 28px;
    box-shadow: 0 12px 35px rgba(15,23,42,.12);
}
.message-box {
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 10px;
    background: #fff;
}
.message-box.internal {
    background: #fffbeb;
}