* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --secondary: #2ecc71;
    --secondary-dark: #27ae60;
    --danger: #e74c3c;
    --danger-dark: #c0392b;
    --warning: #f39c12;
    --warning-dark: #d35400;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --gray: #95a5a6;
    --light-gray: #f5f7fa;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius: 12px;
}

body {
    background-color: var(--light-gray);
    color: var(--dark);
    line-height: 1.6;
    padding-bottom: 40px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

header {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    padding: 18px 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo i {
    font-size: 1.8rem;
}

.current-date {
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 0.95rem;
}

.nav-tabs {
    display: flex;
    background: white;
    border-radius: 50px;
    padding: 5px;
    margin: 20px 0 25px;
    box-shadow: var(--shadow);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab {
    flex: 1;
    min-width: 100px;
    text-align: center;
    padding: 12px 5px;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

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

.page {
    display: none;
    animation: fadeIn 0.4s ease;
}

.page.active {
    display: block;
}

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

.card {
    background: white;
    border-radius: var(--radius);
    padding: 22px;
    margin-bottom: 22px;
    box-shadow: var(--shadow);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 18px;
    margin-bottom: 25px;
}

.stat-card {
    background: white;
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
}

.stat-card.income::after {
    background: linear-gradient(90deg, var(--secondary), var(--secondary-dark));
}

.stat-card.expense::after {
    background: linear-gradient(90deg, var(--danger), var(--danger-dark));
}

.stat-card.balance::after {
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
}

.stat-label {
    font-size: 1rem;
    color: var(--gray);
    margin-bottom: 5px;
}

.stat-value {
    font-size: 2.1rem;
    font-weight: 700;
    margin: 8px 0 5px;
}

.stat-detail {
    font-size: 0.95rem;
    color: var(--gray);
}

.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 26px;
    border-radius: 50px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s;
    font-size: 1rem;
    box-shadow: var(--shadow);
}

.btn:hover {
    opacity: 0.92;
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

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

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

.btn-warning {
    background: var(--warning);
}

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

.btn-secondary:hover {
    background: #7f8c8d;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

.form-control {
    width: 100%;
    padding: 13px 16px;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s;
    background-color: #fafbfc;
}

.form-control:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.table-container {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid #eee;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

th, td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: var(--dark);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background-color: #f8f9fa;
}

.actions {
    display: flex;
    gap: 8px;
}

.action-btn {
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.action-btn i {
    pointer-events: none;
}

.action-btn.edit {
    background: var(--warning);
    color: white;
}

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

.date-header {
    background: #f8f9fa;
    padding: 12px 18px;
    font-weight: 600;
    border-radius: 10px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.date-title {
    font-size: 1.1rem;
    color: var(--dark);
    font-weight: 700;
}

.date-summary {
    display: flex;
    gap: 15px;
    font-size: 0.9rem;
    font-weight: 500;
}

.summary-expense {
    color: var(--danger-dark);
}

.summary-income {
    color: var(--secondary-dark);
}

.history-selector {
    text-align: center;
    margin: 20px 0;
}

.history-text {
    color: var(--primary);
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 20px;
    transition: all 0.3s;
    display: inline-block;
}

.history-text:hover {
    background: rgba(52, 152, 219, 0.1);
    color: var(--primary-dark);
}

.date-picker-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.date-picker-content {
    background: white;
    border-radius: var(--radius);
    width: 90%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    animation: fadeIn 0.3s;
}

.date-picker-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.date-picker-header span {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark);
}

.close-date-picker {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray);
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

.close-date-picker:hover {
    background: #f0f0f0;
    color: var(--danger);
}

.date-picker-body {
    padding: 20px;
}

.date-picker-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.date-picker-actions .btn {
    flex: 1;
}

.record-item {
    display: flex;
    justify-content: space-between;
    padding: 14px 16px;
    border-bottom: 1px solid #f0f0f0;
    transition: background 0.2s;
}

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

.record-item:hover {
    background-color: #fafafa;
}

.record-info {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.record-type {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    width: fit-content;
}

.record-type.income {
    background: rgba(46, 204, 113, 0.12);
    color: var(--secondary-dark);
}

.record-type.expense {
    background: rgba(231, 76, 60, 0.12);
    color: var(--danger-dark);
}

.record-details {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    font-size: 0.95rem;
    color: #666;
}

.record-amount {
    font-weight: 700;
    font-size: 1.1rem;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 5px;
}

.record-amount.income {
    color: var(--secondary-dark);
}

.record-amount.expense {
    color: var(--danger-dark);
}

.record-bucket {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray);
}

.filter-bar {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.filter-item {
    flex: 1;
    min-width: 200px;
}

.export-options {
    display: flex;
    gap: 12px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    width: 90%;
    max-width: 500px;
    padding: 28px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-title {
    font-size: 1.4rem;
    margin-bottom: 22px;
    text-align: center;
    color: var(--dark);
}

.modal-actions {
    display: flex;
    gap: 12px;
    margin-top: 25px;
}

.modal-actions .btn {
    flex: 1;
}

.date-picker {
    display: flex;
    gap: 12px;
}

.date-select {
    flex: 1;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray);
    cursor: pointer;
    transition: all 0.2s;
}

.close-modal:hover {
    color: var(--danger);
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 1.1rem;
}

.form-row {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.brand-item {
    background: #f8fafb;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 12px;
    border: 1px solid #eee;
}

.brand-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.remove-brand {
    background: var(--danger);
    color: white;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

footer {
    text-align: center;
    padding: 25px 0;
    color: var(--gray);
    font-size: 0.9rem;
    margin-top: 20px;
}

.water-animation {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 20px;
    background: linear-gradient(90deg, #3498db, #2ecc71);
    opacity: 0.1;
}

@media (max-width: 768px) {
    .stats {
        grid-template-columns: 1fr;
    }
    
    .filter-item {
        min-width: 100%;
    }
    
    .date-picker {
        flex-direction: column;
    }
    
    .header-content {
        flex-direction: column;
        gap: 12px;
    }
    
    .nav-tabs {
        margin-top: 15px;
    }
}

@media (max-width: 480px) {
    .card {
        padding: 18px;
    }
    
    .stat-value {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: 12px 20px;
        font-size: 0.95rem;
    }
    
    .modal-content {
        padding: 20px 15px;
    }
}