body {
    background: #f4f6fb;
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}
.app-sidebar {
    width: 250px;
    min-height: 100vh;
    background: #0f172a;
}
.app-sidebar a {
    color: #cbd5e1;
    text-decoration: none;
    display: flex;
    gap: .6rem;
    align-items: center;
    padding: .7rem 1rem;
    border-radius: .5rem;
}
.app-sidebar a:hover,
.app-sidebar a.active {
    background: #1e293b;
    color: #fff;
}
.app-main {
    min-height: 100vh;
}
.stat-card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, .06);
}
.upload-box {
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    background: #f8fafc;
}
.result-item {
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    background: #fff;
}
.hero {
    background: linear-gradient(135deg, #0f172a, #1d4ed8);
    color: #fff;
    border-radius: 24px;
}
.badge-invoice {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
}
@media (max-width: 991px) {
    .app-sidebar {
        width: 100%;
        min-height: auto;
    }
}