:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 16px;
    --input-bg: #fefefe;
}

body.dark-theme {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --border: #334155;
    --input-bg: #0f172a;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 2rem 1rem;
}

.dashboard {
    max-width: 1100px;
    margin: 0 auto;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2.5rem;
    text-align: left;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.02em;
    margin-bottom: 0.25rem;
}

header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.btn-icon {
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text-main);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

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

.btn-icon svg {
    width: 24px;
    height: 24px;
}

.hidden {
    display: none !important;
}

/* Controls Bar */
.controls-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1rem 1.5rem;
}

.search-box {
    flex: 1;
    min-width: 200px;
    position: relative;
    display: flex;
    align-items: center;
}

.search-box .icon {
    position: absolute;
    left: 1rem;
    width: 20px;
    height: 20px;
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 3rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    background-color: var(--input-bg);
    color: var(--text-main);
    transition: all 0.2s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.filter-group select {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    background-color: var(--input-bg);
    color: var(--text-main);
    cursor: pointer;
    min-width: 150px;
    transition: all 0.2s ease;
}

.filter-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.btn-secondary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: transparent;
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-secondary .icon {
    width: 20px;
    height: 20px;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* Summary Cards */
.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.summary-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.summary-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--primary);
    border-radius: 4px 0 0 4px;
}

.summary-card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.summary-card .amount, .summary-card .count {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-main);
    line-height: 1.2;
}

.summary-card .amount {
    color: var(--primary);
}

/* Layout */
.main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 900px) {
    .main-content {
        grid-template-columns: 350px 1fr;
    }
}

.left-column {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Sections */
h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: var(--text-main);
}

/* Form Styles */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-main);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    background-color: var(--input-bg);
    color: var(--text-main);
    transition: all 0.2s ease;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    background-color: var(--card-bg);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.btn-primary {
    flex: 1;
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.875rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

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

.btn-primary:active {
    transform: scale(0.98);
}

/* Charts Section */
.charts-container {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.chart-wrapper {
    position: relative;
    height: 250px;
    width: 100%;
}

.chart-wrapper.full-width {
    height: 300px;
}

.mt-4 {
    margin-top: 2.5rem;
}

@media (min-width: 768px) and (max-width: 899px) {
    .charts-container {
        flex-direction: row;
    }
    .chart-wrapper {
        flex: 1;
    }
}

/* Expense List */
.expense-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.expense-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    background-color: var(--card-bg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    animation: slideIn 0.4s ease-out forwards;
}

.expense-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.expense-item.deleting {
    animation: fadeOut 0.3s forwards;
    pointer-events: none;
}

.expense-info {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.expense-name {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--text-main);
}

.expense-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.category-badge {
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

.expense-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.expense-amount-display {
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--text-main);
}

.btn-delete, .btn-edit {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-delete:hover {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.btn-edit:hover {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.btn-delete svg, .btn-edit svg {
    width: 20px;
    height: 20px;
}

.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--text-muted);
    background-color: var(--bg-color);
    border-radius: 12px;
    border: 2px dashed var(--border);
}

.empty-state.hidden {
    display: none;
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: scale(1);
    }
    to {
        opacity: 0;
        transform: scale(0.95);
    }
}