:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --sidebar: #1e293b;
    --bg: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text: #334155;
    --text-muted: #64748b;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #ca8a04;
    --radius: 0.5rem;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.1);
}

body {
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.card {
    border: none;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
}

.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.navbar-brand {
    font-weight: 700;
}

.navbar-dark .nav-link.active,
.navbar-dark .nav-link.active:hover {
    color: #fff !important;
    background: rgba(37, 99, 235, 0.35);
    border-radius: var(--radius);
}

.navbar-dark .nav-link {
    padding: 0.45rem 0.75rem;
    border-radius: var(--radius);
}

.navbar-dark .nav-link:hover {
    background: rgba(255, 255, 255, 0.08);
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--sidebar);
    margin-bottom: 1rem;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.15);
}

.auth-card {
    max-width: 420px;
    margin: 0 auto;
}

.auth-logo {
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 1rem;
}