:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #64748b;
    --accent: #0ea5e9;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 12px;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Navbar */
.navbar {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover)) !important;
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: -0.5px;
    font-size: 1.25rem;
    color: white !important;
}

.nav-link {
    color: white !important;
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, transform 0.2s;
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border);
    padding: 1.25rem 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-body {
    padding: 1.5rem;
}

/* Forms */
.form-label {
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.form-control, .form-select {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.625rem 0.875rem;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

/* Tables */
.table-container {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.table {
    margin-bottom: 0;
    color: var(--text-main);
}

.table thead th {
    background-color: #f1f5f9;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.table tbody td {
    padding: 1rem;
    color: var(--text-main);
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background-color: rgba(79, 70, 229, 0.02);
}

/* Tabs */
.nav-tabs {
    border-bottom: 1px solid var(--border);
    gap: 1.5rem;
}

.nav-tabs .nav-link {
    border: none;
    padding: 0.75rem 0;
    font-weight: 600;
    color: var(--text-muted);
    position: relative;
    transition: color 0.2s;
}

.nav-tabs .nav-link:hover {
    color: var(--primary);
}

.nav-tabs .nav-link.active {
    color: var(--primary);
    background: transparent;
}

.nav-tabs .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary);
}

/* Buttons */
.btn-primary {
    background-color: var(--primary);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    padding: 0.625rem 1.25rem;
    transition: all 0.2s;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

/* Animations */
.animate-fade-in {
    animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Custom UI Components */
.chart-container {
    padding: 10px;
    min-height: 300px;
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
}

.stat-value {
    font-size: 1.875rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.badge-cause {
    padding: 0.35em 0.65em;
    font-size: 0.75em;
    font-weight: 700;
    border-radius: 6px;
}