:root {
    --primary-color: #0f172a; /* Slate 900 */
    --accent-color: #3b82f6; /* Blue 500 */
    --bg-light: #f8fafc; /* Slate 50 */
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --border-color: #e2e8f0;
}

body {
    background-color: var(--bg-light);
    color: #1e293b;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar Customization */
.navbar {
    background-color: var(--primary-color) !important;
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: -0.5px;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    transition: color 0.2s;
}

/* Card Styling */
.card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem;
}

/* Button Refinement */
.btn-primary {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
}

.btn-primary:hover {
    background-color: #2563eb;
    border-color: #2563eb;
}

.btn-success {
    background-color: #10b981;
    border-color: #10b981;
}

/* Footer Enhancement */
.footer {
    background-color: #ffffff !important;
    border-top: 1px solid var(--border-color) !important;
    margin-top: auto;
}

/* Table Styling */
.table th {
    background-color: #f1f5f9;
    color: #475569;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem;
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: #0f172a;
}

/* Hero Section override for index.php */
.bg-primary {
    background-color: var(--primary-color) !important;
}

.rounded-5 {
    border-radius: 24px !important;
}

/* Alerts */
.alert {
    border-radius: 10px;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}