:root {
    --primary: #2563eb;
    --primary-600: #1d4ed8;
    --muted: #6b7280;
    --bg: #ffffff;
    --card-bg: #ffffff;
    --surface: #f8fafc;
    --success: #10b981;
    --danger: #ef4444;
    --radius: 12px;
    --shadow: 0 6px 18px rgba(15,23,42,0.06);
    --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, "Roboto", "Helvetica Neue", Arial;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    background: var(--surface);
    color: #0f172a;
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.45;
    font-size: 15px;
}

/* Navigation */
.navbar {
    background: transparent;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(15,23,42,0.04);
}
.navbar-brand {
    font-weight: 600;
    color: var(--primary);
    font-size: 1.2rem;
}

/* Containers */
.container {
    max-width: 1150px;
}

/* Stat cards */
.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    border: 1px solid rgba(15,23,42,0.03);
}
.stat-card-icon {
    width: 56px;
    height: 56px;
    border-radius: 10px;
    background: linear-gradient(180deg, rgba(37,99,235,0.06), rgba(29,78,216,0.04));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.4rem;
}
.stat-card-info h3 {
    margin: 0;
    font-size: 1.25rem;
    color: #0f172a;
    font-weight: 700;
}
.stat-card-info p {
    margin: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

/* Cards */
.glass-card, .card {
    background: var(--card-bg);
    border-radius: calc(var(--radius) - 2px);
    box-shadow: var(--shadow);
    border: 1px solid rgba(15,23,42,0.04);
    overflow: hidden;
}
.glass-card .card-header {
    padding: 0.9rem 1.2rem;
    background: transparent;
    border-bottom: 1px solid rgba(15,23,42,0.03);
}
.glass-card .card-header h5 {
    margin: 0;
    font-size: 1rem;
    color: #0f172a;
    font-weight: 600;
}
.glass-card .card-body {
    padding: 1rem;
    color: #0f172a;
}

/* Forms */
.form-control {
    border-radius: 8px;
    border: 1px solid rgba(15,23,42,0.06);
    padding: .6rem .75rem;
    background: #fff;
    color: #0f172a;
}
.input-group .form-control[readonly] {
    background: #f3f4f6;
}

/* Tables */
.table {
    background: transparent;
    border-collapse: separate;
}
.table thead th {
    font-weight: 600;
    color: #0f172a;
    border-bottom: 1px solid rgba(15,23,42,0.06);
    background: transparent;
    padding: 0.75rem 0.75rem;
}
.table tbody td {
    padding: 0.65rem 0.75rem;
    color: #0f172a;
    vertical-align: middle;
    border-top: 1px solid rgba(15,23,42,0.03);
}
.table tbody tr:hover {
    background: #fbfdff;
}

/* Truncate */
.truncate {
    max-width: 280px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Buttons */
.btn-primary {
    background: var(--primary);
    border: none;
    color: #fff;
    padding: .45rem .9rem;
    border-radius: 8px;
    font-weight: 600;
    box-shadow: 0 6px 18px rgba(37,99,235,0.12);
}
.btn-outline-secondary {
    color: var(--primary-600);
    border: 1px solid rgba(15,23,42,0.06);
    background: transparent;
}

/* Modals */
.modal-content {
    border-radius: 12px;
    padding: 0;
    overflow: hidden;
    border: 1px solid rgba(15,23,42,0.04);
}
.modal-body {
    padding: 1rem;
}

/* Small text */
.text-muted {
    color: var(--muted) !important;
}

/* Notifications (reuse existing) */
.notification {
    border-radius: 10px;
    padding: .9rem 1.1rem;
    box-shadow: 0 10px 30px rgba(15,23,42,0.08);
    font-size: 0.95rem;
    color: #0f172a;
}

/* Charts container */
.chart-card {
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

/* Utility */
.mb-3 { margin-bottom: 1rem; }
.mt-3 { margin-top: 1rem; }
.gap-2 { gap: .5rem; }

/* Responsive tweaks */
@media (max-width: 768px) {
    .stat-card { padding: .9rem; }
    .stat-card-icon { width: 48px; height: 48px; }
    .container { padding-left: 1rem; padding-right: 1rem; }
}

/* Accessibility: focus */
.form-control:focus, .btn:focus, .btn-primary:focus {
    outline: 3px solid rgba(37,99,235,0.12);
    outline-offset: 2px;
}

/* Footer small */
.footer {
    padding: 2rem 0;
    color: var(--muted);
    font-size: .9rem;
}