:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --success: #2ecc71;
    --danger: #f72585;
    --warning: #ff9f1c;
    --dark: #212529;
    --light: #f8f9fa;
    --white: #ffffff;
    --gray: #6c757d;
    --radius: 12px;
    --shadow: 0 4px 15px rgba(0,0,0,0.08);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: #f4f7fe;
    color: var(--dark);
    line-height: 1.6;
}

.main-container {
    max-width: 1100px;
    margin: 30px auto;
    padding: 0 20px;
}

.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 25px;
    margin-bottom: 25px;
    border: none;
}

h1, h2, h3 {
    font-weight: 700;
    color: var(--dark);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    gap: 8px;
    text-decoration: none;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--secondary); transform: translateY(-2px); }

.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-secondary { background: var(--gray); color: white; }

.btn-block { width: 100%; }
.btn-sm { padding: 8px 16px; font-size: 12px; }

.form-control {
    width: 100%;
    padding: 12px 15px;
    border-radius: 10px;
    border: 1px solid #e0e0e0;
    background: #fcfcfc;
    font-size: 15px;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    background: white;
    box-shadow: 0 0 0 4px rgba(67, 97, 238, 0.1);
}

.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.table th {
    text-align: left;
    padding: 15px;
    background: #f8f9fa;
    color: var(--gray);
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.table td {
    padding: 15px;
    border-bottom: 1px solid #f0f0f0;
    font-size: 14px;
}

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    color: white;
    text-transform: uppercase;
}

.navbar {
    background: var(--white);
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.navbar-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-name {
    font-size: 20px;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.alert {
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert-danger { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: white;
    margin: 5% auto;
    padding: 30px;
    border-radius: 15px;
    width: 95%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

/* Admin Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
}

.stat-info h3 {
    font-size: 13px;
    color: var(--gray);
    margin: 0;
}

.stat-info p {
    font-size: 18px;
    font-weight: 800;
    margin: 0;
}

@media (max-width: 768px) {
    .balance-section { grid-template-columns: 1fr; }
    .navbar-container { flex-direction: column; gap: 15px; }
}