:root {
    --bg: #f4f7fb;
    --panel: #ffffff;
    --ink: #0f172a;
    --muted: #64748b;
    --brand: #0f766e;
    --brand-dark: #134e4a;
    --accent: #f59e0b;
    --border: #dbe4f0;
}
html, body {
    height: 100%;
    margin: 0;
}

body {
    min-height: 100vh;
    background: radial-gradient(circle at top left, #ecfeff, transparent 25%), 
                linear-gradient(180deg, #f8fafc 0%, #eef4ff 100%);
    color: var(--ink);
    font-family: "Segoe UI", "Trebuchet MS", sans-serif;
}

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

.sidebar {
    width: 260px;
    min-height: 100vh;
    background: linear-gradient(180deg, #0f172a, #1e293b);
    color: #cbd5f5;
    
    display: flex;
    flex-direction: column;

    position: sticky;
    top: 0;

    overflow-y: auto;   /* 👈 THIS FIXES THE HIDDEN MENU */
}

.sidebar-menu {
    flex: 1;
    overflow-y: auto;
}

.sidebar h1 {
    font-size: 1.75rem;
    margin: 0.75rem 0 0.25rem;
}

.sidebar p {
    color: rgba(255,255,255,.7);
    margin: 0;
}

.brand-mark {
    width: 56px;
    height: 56px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #fbbf24, #fb7185);
    font-size: 1.5rem;
    font-weight: 700;
}

.sidebar .nav-link {
    color: rgba(255,255,255,.86);
    border-radius: 14px;
    padding: 0.85rem 1rem;
}

.sidebar .nav-link:hover {
    background: rgba(255,255,255,.1);
    color: #fff;
}

.main-content {
    flex: 1;
    padding: 2rem;
    min-height: 100vh;
}

.topbar {
    margin-bottom: 1.5rem;
}

.page-title {
    margin: 0;
    font-size: 2rem;
}

.page-subtitle {
    color: var(--muted);
}

.panel-card,
.stat-card {
    border: 1px solid rgba(219, 228, 240, .8);
    border-radius: 24px;
    box-shadow: 0 15px 35px rgba(15, 23, 42, .06);
    background: rgba(255,255,255,.92);
}

.stat-card {
    padding: 1.4rem;
}

.stat-card span {
    color: var(--muted);
    display: block;
}

.stat-card strong {
    display: block;
    font-size: 2rem;
    margin-top: 0.5rem;
}

.alert-strip,
.list-line,
.meta-grid {
    display: grid;
    gap: 0.45rem;
}

.alert-strip,
.list-line {
    padding: 0.9rem 0;
    border-bottom: 1px solid var(--border);
}

.meta-grid {
    grid-template-columns: repeat(2, 1fr);
    margin-top: 1rem;
}

.meta-grid span {
    color: var(--muted);
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand), #0891b2);
    border: none;
}

@media (max-width: 991px) {
    .app-shell {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .main-content {
        padding: 1rem;
    }
}