:root {
    --primary-color: #0088cc;
    --secondary-color: #1e90ff;
    --accent-color: #32cd32;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 20px;
    background: rgba(255, 255, 255, 0.95);
    min-height: 100vh;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 20px;
    color: white;
    box-shadow: var(--box-shadow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.logo i {
    font-size: 2rem;
}

.balance-box {
    background: rgba(255, 255, 255, 0.2);
    padding: 15px;
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.balance {
    display: flex;
    align-items: center;
    gap: 15px;
}

.balance i {
    font-size: 2rem;
}

.balance-label {
    display: block;
    font-size: 0.9rem;
    opacity: 0.9;
}

.balance-amount {
    font-size: 1.8rem;
    font-weight: bold;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

h2 {
    color: var(--dark-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.stat-card {
    background: white;
    padding: 15px;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.stat-card i {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.stat-card h3 {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--dark-color);
}

/* Actions Section */
.actions-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.action-btn {
    background: white;
    border: none;
    padding: 20px 15px;
    border-radius: var(--border-radius);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
    font-size: 1rem;
    color: var(--dark-color);
}

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

.action-btn:hover i {
    color: white;
}

.action-btn i {
    font-size: 1.8rem;
    color: var(--primary-color);
}

/* Referral Section */
.referral-box {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.referral-box input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.copy-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.copy-btn:hover {
    background: var(--secondary-color);
}

.referral-info {
    background: #e8f4fc;
    padding: 15px;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.referral-info p {
    margin: 5px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Activity Section */
.activity-list {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.activity-item {
    padding: 15px;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: center;
    gap: 15px;
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 40px;
    height: 40px;
    background: var(--light-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.activity-details {
    flex: 1;
}

.activity-title {
    font-weight: bold;
    margin-bottom: 3px;
}

.activity-time {
    font-size: 0.8rem;
    color: #666;
}

.activity-amount {
    font-weight: bold;
    color: var(--success-color);
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 400px;
    max-height: 80vh;
    overflow-y: auto;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #eee;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.modal-header h2 {
    color: white;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.modal-body {
    padding: 20px;
}

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

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.hint {
    display: block;
    margin-top: 5px;
    font-size: 0.85rem;
    color: #666;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 15px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 136, 204, 0.3);
}

.withdraw-submit {
    background: linear-gradient(135deg, var(--success-color), #27ae60);
}

.modal-info {
    background: #f8f9fa;
    padding: 12px;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    color: #666;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Profile Modal */
.profile-info {
    text-align: center;
    margin-bottom: 20px;
}

.avatar {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.user-details h3 {
    margin-bottom: 10px;
    color: var(--dark-color);
}

.user-details p {
    margin: 5px 0;
    color: #666;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 20px;
}

.profile-stat {
    background: #f8f9fa;
    padding: 15px;
    border-radius: var(--border-radius);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.profile-stat i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.profile-stat span {
    font-size: 0.85rem;
    color: #666;
}

.profile-stat strong {
    font-size: 1.1rem;
    color: var(--dark-color);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--dark-color);
    color: white;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    z-index: 1001;
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .profile-stats {
        grid-template-columns: 1fr;
    }
}