:root {
    --ink: #18212f;
    --muted: #6d7684;
    --line: #e6eaf0;
    --paper: #f6f8fb;
    --accent: #0f766e;
}

body {
    background: var(--paper);
    color: var(--ink);
}

.app-shell {
    display: grid;
    grid-template-columns: 250px minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    background: #151922;
    color: #fff;
    padding: 22px;
}

.brand {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0;
    padding: 8px 0 22px;
}

.sidebar .nav-link {
    color: #b9c0cc;
    border-radius: 8px;
    margin-bottom: 6px;
    padding: 10px 12px;
}

.sidebar .nav-link.active,
.sidebar .nav-link:hover {
    background: #263040;
    color: #fff;
}

.main {
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 18px 28px;
}

.topbar h1 {
    font-size: 1.35rem;
    margin: 0;
}

.topbar span {
    color: var(--muted);
    font-size: .92rem;
}

.content {
    padding: 28px;
}

.metric {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 18px;
}

.metric span {
    color: var(--muted);
    font-size: .88rem;
}

.metric strong {
    display: block;
    font-size: 1.45rem;
    margin-top: 8px;
}

.panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 20px;
}

.footer {
    color: var(--muted);
    padding: 18px 28px 30px;
    font-size: .85rem;
}

.login-screen {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #f6f8fb, #eaf3f1);
}

.login-panel {
    width: min(420px, calc(100vw - 32px));
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 28px;
    box-shadow: 0 20px 45px rgba(24, 33, 47, .08);
}

.table-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }

    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }
}