.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid var(--border-color);
}

header h1 {
    color: var(--dark-color);
    font-weight: 900;
    font-size: 2.5rem;
    text-transform: uppercase;
    letter-spacing: -1px;
    text-shadow: 2px 2px 0 var(--primary-color);
}

nav ul {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

nav a {
    color: var(--dark-color);
    font-weight: 700;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    position: relative;
    border: 2px solid transparent;
    text-transform: uppercase;
}

nav a:hover {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

nav a.active {
    color: var(--primary-color);
    border: 2px solid var(--border-color);
    background-color: white;
    box-shadow: 3px 3px 0px var(--border-color);
}

/* Mobile Menu Button */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    box-shadow: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--dark-color);
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
}

/* Media Queries */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header {
        flex-direction: column;
        align-items: flex-start;
        position: relative;
    }
    
    header h1 {
        font-size: 2rem;
        margin-bottom: 1rem;
    }
    
    nav {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }
    
    nav::-webkit-scrollbar {
        display: none; /* Chrome, Safari, Edge */
    }
    
    nav ul {
        display: flex;
        gap: 0.75rem;
        padding-bottom: 0.5rem;
        min-width: max-content;
    }
    
    nav a {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
        white-space: nowrap;
    }
    
    .charts-container {
        flex-direction: column;
    }
    
    .transaction-filters {
        flex-direction: column;
    }
    
    .date-range {
        flex-direction: column;
    }
    
    .modal-content {
        width: 90%;
    }
    
    .card p {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0.75rem;
    }
    
    header h1 {
        font-size: 1.75rem;
    }
    
    nav ul {
        gap: 0.5rem;
    }
    
    nav a {
        padding: 0.4rem 0.6rem;
        font-size: 0.75rem;
    }
    
    .summary-cards {
        grid-template-columns: 1fr;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.page.active {
    animation: fadeIn 0.5s ease-in-out;
}

.card, .chart-card, .recent-transactions, .transactions-list, .subscriptions-list, .setting-group {
    animation: fadeIn 0.5s ease-in-out;
}