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

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --danger-color: #dc2626;
    --danger-hover: #b91c1c;
    --success-color: #16a34a;
    --warning-color: #d97706;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

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

#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 30px;
}

.app-header h1 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* Navigation Tabs */
.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 4px;
    background: var(--card-bg);
    padding: 4px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: inline-flex;
}

.nav-tab {
    padding: 10px 24px;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.nav-tab:hover {
    color: var(--text-primary);
    background: var(--bg-color);
}

.nav-tab.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Notification */
.notification {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-weight: 500;
    animation: slideDown 0.3s ease;
}

.notification.success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.notification.error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.notification.warning {
    background: #fffbeb;
    color: #92400e;
    border: 1px solid #fde68a;
}

.notification.hidden {
    display: none;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Views */
.view {
    display: none;
}

.view.active {
    display: block;
    animation: fadeIn 0.2s ease;
}

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

.view-header {
    margin-bottom: 24px;
}

.view-header h2 {
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.view-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Forms */
.entry-form {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.form-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.form-group {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 140px;
}

.form-group label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input.invalid {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.form-actions {
    display: flex;
    gap: 8px;
    flex: 0 0 auto;
    min-width: auto;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    white-space: nowrap;
}

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

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

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.82rem;
}

.btn-icon {
    padding: 4px 8px;
    font-size: 0.8rem;
}

.hidden {
    display: none !important;
}

/* Summary Section */
.summary-section {
    background: var(--card-bg);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.summary-section h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.summary-filter {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.summary-filter label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.summary-filter input {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.85rem;
}

.summary-cards {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.summary-card {
    flex: 1;
    min-width: 150px;
    padding: 12px 16px;
    background: var(--bg-color);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.summary-label {
    display: block;
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.summary-value {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Table */
.table-container {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

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

.data-table th {
    background: var(--bg-color);
    padding: 10px 12px;
    text-align: left;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
}

.data-table td {
    padding: 10px 12px;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr:hover {
    background: var(--bg-color);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.action-btns {
    display: flex;
    gap: 4px;
}

.empty-message {
    padding: 40px 20px;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

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

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    max-width: 400px;
    width: 90%;
}

.modal-content h3 {
    margin-bottom: 8px;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

/* Responsive */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
    }

    .form-group {
        min-width: 100%;
    }

    .summary-cards {
        flex-direction: column;
    }

    .nav-tabs {
        width: 100%;
    }

    .nav-tab {
        flex: 1;
        text-align: center;
    }
}