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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 0;
}

/* Navigation Bar */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    padding: 20px 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 10px;
}

.nav-menu li a {
    text-decoration: none;
    color: #333;
    padding: 10px 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-menu li a:hover {
    background: #f0f0f0;
    color: #667eea;
}

.nav-menu li a.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
    padding: 20px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Home Page Feature Cards */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 25px;
}

.feature-card {
    background: white;
    border-radius: 15px;
    padding: 40px 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-decoration: none;
    color: inherit;
    text-align: center;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.feature-card h2 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.feature-card p {
    color: #666;
    font-size: 1rem;
}

/* Page Content */
.page-content {
    max-width: 800px;
    margin: 40px auto;
}

.single-card {
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.card.full-width {
    grid-column: 1 / -1;
}

.card-header {
    margin-bottom: 25px;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 15px;
}

.card-header h2 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.card-header p {
    color: #666;
    font-size: 0.9rem;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 600;
    color: #333;
    font-size: 0.95rem;
}

.form-group input {
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

.form-group small {
    color: #888;
    font-size: 0.85rem;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.result {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    display: none;
}

.result.show {
    display: block;
    animation: slideIn 0.3s ease;
}

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

.result.success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

.result.error {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    color: #721c24;
}

.result.info {
    background: #d1ecf1;
    border: 1px solid #bee5eb;
    color: #0c5460;
}

.payment-link {
    background: #f8f9fa;
    padding: 12px;
    border-radius: 6px;
    margin-top: 10px;
    word-break: break-all;
    font-family: monospace;
    font-size: 0.9rem;
}

.copy-btn {
    margin-top: 10px;
    padding: 8px 16px;
    background: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
}

.copy-btn:hover {
    background: #218838;
}

.status-badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.85rem;
    margin-top: 10px;
}

.status-success {
    background: #28a745;
    color: white;
}

.status-pending {
    background: #ffc107;
    color: #333;
}

.status-failed {
    background: #dc3545;
    color: white;
}

.transaction-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.transaction-item {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.transaction-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.transaction-field label {
    font-size: 0.85rem;
    color: #666;
    font-weight: 600;
}

.transaction-field span {
    font-size: 1rem;
    color: #333;
}

.empty-state {
    text-align: center;
    color: #999;
    padding: 40px;
    font-style: italic;
}

.loader {
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 1s linear infinite;
    margin: 10px auto;
}

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

/* Success Page */
.success-page {
    text-align: center;
    padding: 60px 40px;
}

.success-icon {
    font-size: 5rem;
    margin-bottom: 20px;
}

.success-page h1 {
    color: #28a745;
    margin-bottom: 15px;
}

.success-page p {
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 30px;
}

.success-actions {
    display: flex;
    flex-direction: column;
    gap: 15px;
    max-width: 300px;
    margin: 0 auto;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

/* Amount Tabs */
.amount-tabs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 15px;
}

.amount-tab {
    padding: 12px 20px;
    border: 2px solid #e0e0e0;
    background: white;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #333;
}

.amount-tab:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.amount-tab.active {
    border-color: #667eea;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

@media (max-width: 768px) {
    .amount-tabs {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .transaction-item {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        gap: 5px;
    }
    
    .nav-menu li a {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
    
    .nav-brand {
        font-size: 1.2rem;
    }
}