/* === Variables === */
:root {
    --bg: #0f1117;
    --bg-card: #1a1d27;
    --bg-input: #252836;
    --border: #2e3144;
    --text: #e4e6ef;
    --text-muted: #8b8fa3;
    --income: #22c55e;
    --income-dim: rgba(34, 197, 94, 0.15);
    --expense: #ef4444;
    --expense-dim: rgba(239, 68, 68, 0.15);
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --radius: 10px;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

/* === Reset === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

#app {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px 16px;
}

/* === Header === */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* === Dashboard === */
.dashboard {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: var(--shadow);
}

.card-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.card-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.card-income {
    border-top: 3px solid var(--income);
}

.card-expense {
    border-top: 3px solid var(--expense);
}

.card-balance {
    border-top: 3px solid var(--primary);
}

/* === Text Colors === */
.text-income { color: var(--income); }
.text-expense { color: var(--expense); }

/* === Charts === */
.charts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 28px;
}

.chart-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.chart-container h2 {
    font-size: 1rem;
    margin-bottom: 16px;
    font-weight: 600;
}

.chart-wrapper {
    position: relative;
    min-height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-wrapper canvas {
    max-height: 260px;
}

.chart-empty {
    color: var(--text-muted);
    font-size: 0.9rem;
    position: absolute;
}

/* === Form === */
.form-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 28px;
    box-shadow: var(--shadow);
}

.form-section h2 {
    font-size: 1.1rem;
    margin-bottom: 18px;
    font-weight: 600;
}

.transaction-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

input, select {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 10px 12px;
    color: var(--text);
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
}

select option {
    background: var(--bg-input);
    color: var(--text);
}

/* === Toggle === */
.toggle-group {
    display: flex;
    gap: 8px;
}

.toggle-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-input);
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
}

.toggle-btn.active.toggle-income {
    background: var(--income-dim);
    border-color: var(--income);
    color: var(--income);
}

.toggle-btn.active.toggle-expense {
    background: var(--expense-dim);
    border-color: var(--expense);
    color: var(--expense);
}

/* === Buttons === */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: 8px 14px;
    font-size: 0.8rem;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 4px;
}

/* === Transactions === */
.transactions-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 28px;
    box-shadow: var(--shadow);
}

.transactions-section h2 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    font-weight: 600;
}

.filters {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.filters .form-group {
    flex: 1;
    min-width: 130px;
}

.table-wrap {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    text-align: left;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
}

tbody td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    font-size: 0.92rem;
}

tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

.text-right {
    text-align: right;
}

.badge {
    display: inline-block;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 3px 12px;
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.actions-cell {
    white-space: nowrap;
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: var(--bg-input);
    color: var(--primary);
}

.btn-icon-danger:hover {
    color: var(--expense);
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
    padding: 32px;
    font-size: 0.95rem;
}

/* === Footer === */
.footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.82rem;
    padding: 16px 0;
}

/* === Icon helper === */
.icon {
    font-size: 1.1rem;
}

/* === Responsive === */
@media (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
    }

    .charts {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .filters .form-group {
        min-width: auto;
    }

    .header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    table {
        font-size: 0.85rem;
    }

    thead th, tbody td {
        padding: 8px 6px;
    }
}

@media (max-width: 480px) {
    #app {
        padding: 16px 10px;
    }

    .card-value {
        font-size: 1.2rem;
    }
}