:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #ffffff;
    --surface-color: #f8fafc;
    --text-color: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --focus-color: #3b82f6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --spacing-unit: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--bg-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
    text-decoration: none;
    z-index: 100;
    border-radius: 0 0 4px 0;
}

.skip-link:focus {
    top: 0;
}

header {
    background: var(--primary-color);
    color: white;
    padding: calc(var(--spacing-unit) * 2) 0;
    box-shadow: var(--shadow-md);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 2);
}

nav a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
    border-radius: 4px;
    transition: background-color 0.2s ease, color 0.2s ease;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

nav a:focus {
    outline: 2px solid white;
    outline-offset: 2px;
}

nav a[aria-current="page"] {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    font-weight: 600;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 2);
}

main {
    flex: 1;
    padding: calc(var(--spacing-unit) * 4) 0;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 3);
    line-height: 1.2;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 2);
    line-height: 1.2;
}

h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1);
    line-height: 1.2;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.stat-card {
    background: var(--surface-color);
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card h3 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.cap-section {
    background: var(--surface-color);
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 8px;
    margin-bottom: calc(var(--spacing-unit) * 4);
    border: 1px solid var(--border-color);
}

.cap-controls {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 2);
    align-items: center;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.cap-controls label {
    font-weight: 500;
}

.cap-message {
    padding: calc(var(--spacing-unit) * 2);
    border-radius: 4px;
    font-weight: 500;
    min-height: calc(var(--spacing-unit) * 6);
}

.cap-message.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.cap-message.warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
}

.cap-message.danger {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.chart-section {
    background: var(--surface-color);
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 8px;
    margin-bottom: calc(var(--spacing-unit) * 4);
    border: 1px solid var(--border-color);
}

.chart-container {
    min-height: 300px;
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1);
}

.chart-bar {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
}

.chart-label {
    min-width: 100px;
    font-weight: 500;
}

.chart-bar-fill {
    flex: 1;
    background: var(--primary-color);
    height: 32px;
    border-radius: 4px;
    transition: width 0.3s ease;
    position: relative;
}

.chart-bar-value {
    position: absolute;
    right: calc(var(--spacing-unit) * 1);
    top: 50%;
    transform: translateY(-50%);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
}

.recent-section {
    background: var(--surface-color);
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.recent-item {
    padding: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s ease;
}

.recent-item:last-child {
    border-bottom: none;
}

.recent-item:hover {
    background-color: rgba(37, 99, 235, 0.05);
}

.recent-info {
    flex: 1;
}

.recent-description {
    font-weight: 500;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.recent-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.recent-amount {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--primary-color);
}

.empty-state {
    color: var(--text-secondary);
    text-align: center;
    padding: calc(var(--spacing-unit) * 4);
    font-style: italic;
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="file"],
select {
    width: 100%;
    padding: calc(var(--spacing-unit) * 1.5);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
select:focus {
    outline: none;
    border-color: var(--focus-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

input[type="checkbox"]:focus {
    outline: 2px solid var(--focus-color);
    outline-offset: 2px;
}

button,
.btn-primary,
.btn-secondary,
.btn-danger {
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
    font-family: inherit;
}

button:focus,
.btn-primary:focus,
.btn-secondary:focus,
.btn-danger:focus {
    outline: 2px solid var(--focus-color);
    outline-offset: 2px;
}

button:active,
.btn-primary:active,
.btn-secondary:active,
.btn-danger:active {
    transform: translateY(1px);
}

.btn-primary,
button[type="submit"] {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover,
button[type="submit"]:hover {
    background: var(--primary-hover);
}

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

.btn-secondary:hover {
    background: #475569;
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-icon {
    padding: calc(var(--spacing-unit) * 0.5);
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.5rem;
    line-height: 1;
}

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

.form-section {
    max-width: 600px;
}

.form-group {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.required {
    color: var(--danger-color);
}

.help-text {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: calc(var(--spacing-unit) * 0.5);
}

.error-message {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: calc(var(--spacing-unit) * 0.5);
    min-height: 1.5rem;
}

.status-message {
    padding: calc(var(--spacing-unit) * 2);
    border-radius: 4px;
    margin-top: calc(var(--spacing-unit) * 2);
    font-weight: 500;
}

.status-message.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.status-message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.form-actions {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 4);
}

.validation-info {
    margin-top: calc(var(--spacing-unit) * 6);
    padding: calc(var(--spacing-unit) * 3);
    background: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.validation-info ul {
    margin-left: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 2);
}

.validation-info li {
    margin-bottom: calc(var(--spacing-unit) * 1);
    line-height: 1.5;
}

.validation-info code {
    background: rgba(37, 99, 235, 0.1);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

.controls-bar {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 3);
    padding: calc(var(--spacing-unit) * 3);
    background: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.search-box,
.filter-box {
    flex: 1;
}

.search-options {
    margin-top: calc(var(--spacing-unit) * 1);
}

.search-options label {
    display: inline-flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1);
    font-size: 0.875rem;
}

.sort-controls {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 3);
    flex-wrap: wrap;
}

.sort-controls button {
    background: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.sort-controls button:hover {
    background: rgba(37, 99, 235, 0.05);
    border-color: var(--primary-color);
}

.sort-controls button[aria-pressed="true"] {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.sort-icon {
    margin-left: calc(var(--spacing-unit) * 0.5);
}

.records-table-wrapper {
    overflow-x: auto;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.records-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.records-table th {
    background: var(--surface-color);
    padding: calc(var(--spacing-unit) * 2);
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
}

.records-table td {
    padding: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--border-color);
}

.records-table tr:hover {
    background: rgba(37, 99, 235, 0.02);
}

.records-table mark {
    background: #fef08a;
    padding: 2px 4px;
    border-radius: 2px;
}

.records-cards {
    display: none;
}

.record-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 2);
    transition: box-shadow 0.2s ease;
}

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

.record-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.record-description {
    font-weight: 600;
    font-size: 1.125rem;
    margin-bottom: calc(var(--spacing-unit) * 0.5);
}

.record-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.record-amount {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.record-category {
    display: inline-block;
    padding: calc(var(--spacing-unit) * 0.5) calc(var(--spacing-unit) * 1.5);
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.record-actions {
    display: flex;
    gap: calc(var(--spacing-unit) * 1);
}

.action-btn {
    padding: calc(var(--spacing-unit) * 1) calc(var(--spacing-unit) * 2);
    font-size: 0.875rem;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal[hidden] {
    display: none;
}

.modal-content {
    background: white;
    padding: calc(var(--spacing-unit) * 4);
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    box-shadow: var(--shadow-lg);
}

.modal-content h3 {
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.modal-content p {
    margin-bottom: calc(var(--spacing-unit) * 3);
    line-height: 1.5;
}

.modal-actions {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    justify-content: flex-end;
}

.settings-group {
    margin-bottom: calc(var(--spacing-unit) * 5);
    padding: calc(var(--spacing-unit) * 3);
    background: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.settings-group > p {
    color: var(--text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.currency-rates {
    margin-top: calc(var(--spacing-unit) * 3);
}

.categories-list {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(var(--spacing-unit) * 1.5);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.add-category {
    margin-top: calc(var(--spacing-unit) * 2);
}

.data-actions {
    display: grid;
    gap: calc(var(--spacing-unit) * 3);
}

.action-item {
    padding: calc(var(--spacing-unit) * 3);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.action-item h4 {
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.action-item p {
    color: var(--text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.warning-text {
    color: var(--danger-color);
    font-weight: 500;
}

.about-content {
    max-width: 800px;
}

.about-content h3 {
    margin-top: calc(var(--spacing-unit) * 4);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.about-content ul {
    margin-left: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.about-content li {
    margin-bottom: calc(var(--spacing-unit) * 1);
    line-height: 1.5;
}

.contact-info {
    margin-top: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 3);
    background: var(--surface-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.contact-info p {
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.contact-info a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-info a:hover {
    text-decoration: underline;
}

.contact-info a:focus {
    outline: 2px solid var(--focus-color);
    outline-offset: 2px;
    border-radius: 2px;
}

footer {
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: calc(var(--spacing-unit) * 3) 0;
    margin-top: auto;
    text-align: center;
    color: var(--text-secondary);
}

*:focus-visible {
    outline: 2px solid var(--focus-color);
    outline-offset: 2px;
}