:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --dark-color: #1f2937;
    --light-gray: #f3f4f6;
    --border-color: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--light-gray);
    min-height: 100vh;
}

.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    width: 100%;
    max-width: 450px;
}

.logo h1 {
    color: var(--primary-color);
    font-size: 24px;
    text-align: center;
    margin-bottom: 10px;
}

.auth-card h2 {
    font-size: 28px;
    margin-bottom: 30px;
    text-align: center;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 14px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    background-color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

.btn-block {
    width: 100%;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 18px;
}

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.text-center {
    text-align: center;
}

.mt-3 {
    margin-top: 20px;
}

.mt-4 {
    margin-top: 30px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.navbar {
    background-color: white;
    box-shadow: var(--shadow);
    padding: 16px 0;
    margin-bottom: 30px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand h2 {
    color: var(--primary-color);
    font-size: 20px;
}

.nav-menu {
    display: flex;
    gap: 20px;
}

.nav-menu a {
    color: var(--text-primary);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: var(--light-gray);
    text-decoration: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.payment-card,
.verification-card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    max-width: 600px;
    margin: 40px auto;
}

.payment-card h1,
.verification-card h1 {
    font-size: 32px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.payment-card p,
.verification-card p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.payment-info {
    background-color: var(--light-gray);
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 30px;
    text-align: center;
}

.payment-amount h2 {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.amount {
    font-size: 48px;
    font-weight: bold;
    color: var(--primary-color);
}

.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
}

.dashboard-header h1 {
    font-size: 32px;
    color: var(--text-primary);
}

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-header {
    padding: 20px;
    background-color: var(--light-gray);
    border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
    font-size: 20px;
    color: var(--text-primary);
}

.card-body {
    padding: 20px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-row .label {
    font-weight: 500;
    color: var(--text-secondary);
}

.info-row .value {
    color: var(--text-primary);
    text-align: right;
}

.stat-box {
    text-align: center;
    padding: 20px;
    background-color: var(--light-gray);
    border-radius: 8px;
    margin-bottom: 15px;
}

.stat-box:last-child {
    margin-bottom: 0;
}

.stat-value {
    font-size: 32px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

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

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background-color: var(--light-gray);
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    color: var(--text-primary);
}

.table td {
    color: var(--text-secondary);
}

.text-muted {
    color: var(--text-secondary);
}

.loading {
    text-align: center;
    padding: 30px;
}

.spinner {
    border: 4px solid var(--light-gray);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .auth-card,
    .payment-card,
    .verification-card {
        padding: 30px 20px;
    }

    .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav-container {
        flex-direction: column;
        gap: 15px;
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .info-row {
        flex-direction: column;
        gap: 5px;
    }

    .info-row .value {
        text-align: left;
    }

    .table {
        font-size: 14px;
    }

    .table th,
    .table td {
        padding: 8px;
    }
}

@media (max-width: 480px) {
    .amount {
        font-size: 36px;
    }

    .dashboard-header h1 {
        font-size: 24px;
    }

    .auth-card h2 {
        font-size: 24px;
    }
}