:root {
    --primary-color: #2563eb;
    --secondary-color: #4f46e5;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --background-gradient: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
    --glass-bg: rgba(255, 255, 255, 0.95);
    --text-dark: #1e293b;
    --text-light: #f8fafc;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    min-height: 100vh;
    background: var(--background-gradient);
    padding: 2rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--glass-bg);
    border-radius: 2rem;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.app-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--primary-color);
    border-radius: 1.5rem;
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.logo-icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

.app-header span {
    font-size: 1.1rem;
    opacity: 0.9;
}

.app-nav {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.nav-btn {
    background: white;
    border: none;
    padding: 1.5rem;
    border-radius: 1rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-dark);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.nav-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.1);
    background: var(--primary-color);
    color: white;
}

.nav-btn i {
    font-size: 1.75rem;
}

.app-section {
    background: white;
    border-radius: 1.5rem;
    padding: 2.5rem;
    margin-bottom: 2rem;
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.4s ease;
}

.app-section.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.section-header i {
    font-size: 2rem;
    color: var(--primary-color);
    background: #e0e7ff;
    padding: 1rem;
    border-radius: 0.75rem;
}

.form-group {
    margin-bottom: 1.75rem;
}

label {
    display: block;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}

input {
    width: 100%;
    padding: 1rem 1.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 0.75rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px #bfdbfe;
    outline: none;
}

.action-btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.75rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1rem;
}

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

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

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

.action-btn:hover {
    opacity: 0.92;
    transform: translateY(-2px);
}

.transaction-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 2rem;
}

.status-card {
    padding: 1.5rem;
    border-radius: 1rem;
    margin-top: 2rem;
    display: none;
    align-items: center;
    gap: 1rem;
}

.status-card i {
    font-size: 2rem;
}

.success {
    background: #d1fae5;
    border: 2px solid var(--success-color);
    color: #065f46;
}

.error {
    background: #fee2e2;
    border: 2px solid var(--danger-color);
    color: #991b1b;
}

.account-card {
    background: white;
    border-radius: 1.5rem;
    padding: 2rem;
    margin-top: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.transaction-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    margin: 1rem 0;
    background: #f8fafc;
    border-radius: 1rem;
    position: relative;
    overflow: hidden;
}

.transaction-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--success-color);
}

.transaction-item.withdrawal::before {
    background: var(--danger-color);
}

.transaction-icon {
    font-size: 1.75rem;
}

.transaction-details {
    flex-grow: 1;
}

.transaction-type {
    font-weight: 600;
    color: var(--text-dark);
}

.transaction-amount {
    font-size: 1.25rem;
    font-weight: 700;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    
    .app-nav {
        grid-template-columns: 1fr;
    }
    
    .app-section {
        padding: 1.5rem;
    }
    
    .transaction-grid {
        grid-template-columns: 1fr;
    }
}