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

:root {
    --primary-green: #10b981;
    --dark-green: #059669;
    --light-green: #d1fae5;
    --accent-gold: #f59e0b;
    --danger-red: #ef4444;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f0fdf4 0%, #ecfdf5 100%);
    min-height: 100vh;
    color: var(--text-primary);
}

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

/* Header */
header {
    text-align: center;
    padding: 30px 0;
}

header h1 {
    font-size: 2.5rem;
    color: var(--dark-green);
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Dashboard Cards */
.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.balance-card {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--dark-green) 100%);
    color: white;
}

.balance-card h3 {
    color: rgba(255, 255, 255, 0.9);
}

.income-card {
    border-left: 4px solid var(--primary-green);
}

.expense-card {
    border-left: 4px solid var(--danger-red);
}

.card h3 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.amount {
    font-size: 2rem;
    font-weight: 700;
}

.balance-card .amount {
    font-size: 2.5rem;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 30px;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.left-panel, .right-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px var(--light-green);
}

.btn {
    width: 100%;
    padding: 14px 24px;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.btn-income {
    background: linear-gradient(135deg, var(--primary-green) 0%, var(--dark-green) 100%);
    color: white;
}

.btn-income:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-expense {
    background: linear-gradient(135deg, var(--danger-red) 0%, #dc2626 100%);
    color: white;
}

.btn-expense:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

/* Chart */
.chart-card {
    min-height: 350px;
}

.chart-card canvas {
    max-height: 280px;
}

/* Transactions */
.transactions-header {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 12px;
}

.tab-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--light-green);
    color: var(--dark-green);
}

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

.transactions-list {
    max-height: 400px;
    overflow-y: auto;
}

.transaction-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px;
    border-radius: 10px;
    margin-bottom: 8px;
    background: var(--bg-color);
    transition: background 0.2s;
}

.transaction-item:hover {
    background: #e5e7eb;
}

.transaction-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.transaction-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.transaction-item.income .transaction-icon {
    background: var(--light-green);
}

.transaction-item.expense .transaction-icon {
    background: #fee2e2;
}

.transaction-details h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.transaction-details .category {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: capitalize;
}

.transaction-amount {
    font-size: 1.1rem;
    font-weight: 700;
}

.transaction-item.income .transaction-amount {
    color: var(--primary-green);
}

.transaction-item.expense .transaction-amount {
    color: var(--danger-red);
}

.delete-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all 0.2s;
    opacity: 0;
}

.transaction-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    background: #fee2e2;
    color: var(--danger-red);
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Scrollbar */
.transactions-list::-webkit-scrollbar {
    width: 6px;
}

.transactions-list::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 3px;
}

.transactions-list::-webkit-scrollbar-thumb {
    background: var(--primary-green);
    border-radius: 3px;
}

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

.transaction-item {
    animation: slideIn 0.3s ease-out;
}