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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #059669;
    --danger: #dc2626;
    --warning: #d97706;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.screen {
    min-height: 100vh;
}

#auth-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.auth-container {
    background: var(--card-bg);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-container h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--primary);
}

.auth-form h2 {
    margin-bottom: 1rem;
    color: var(--text);
}

.auth-form p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.auth-form input {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1.125rem;
    text-align: center;
    letter-spacing: 0.5rem;
    margin-bottom: 1.5rem;
    transition: border-color 0.2s;
}

.auth-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.auth-form button {
    width: 100%;
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.auth-form button:hover {
    background: var(--primary-dark);
}

header {
    background: var(--card-bg);
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

header h1 {
    color: var(--primary);
    font-size: 1.75rem;
}

.logout-btn {
    padding: 0.5rem 1rem;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
}

.logout-btn:hover {
    background: #b91c1c;
}

.tab-nav {
    background: var(--card-bg);
    padding: 0 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: 0;
}

.tab-btn {
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-muted);
    border-bottom: 3px solid transparent;
    transition: all 0.2s;
    min-height: 48px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    white-space: nowrap;
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-btn:hover, .tab-btn:active {
    color: var(--primary);
    background: var(--bg);
}

.tab-content {
    display: none;
    padding: 2rem;
}

.tab-content.active {
    display: block;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.summary-card, .quick-add {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
}

.summary-card h3, .quick-add h3 {
    margin-bottom: 1.5rem;
    color: var(--text);
}

.summary-stats {
    display: grid;
    gap: 1rem;
}

.stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border);
}

.stat:last-child {
    border-bottom: none;
}

.stat .label {
    color: var(--text-muted);
    font-weight: 500;
}

.stat .value {
    font-weight: 600;
    font-size: 1.125rem;
}

.stat .value.income {
    color: var(--success);
}

.stat .value.expense {
    color: var(--danger);
}

.stat .value.profit {
    color: var(--primary);
}

.quick-add {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.quick-btn {
    padding: 1rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.income-btn:hover {
    background: #047857;
}

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

.expense-btn:hover {
    background: #b91c1c;
}

.form-section {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.form-section h2 {
    margin-bottom: 1.5rem;
    color: var(--text);
}

.entry-form {
    display: grid;
    gap: 1rem;
}

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

/* Checkbox styles removed - no longer needed */

.merchant-section {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.merchant-section h4 {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.merchant-list {
    display: grid;
    gap: 0.75rem;
}

.entry-form input, .entry-form select {
    padding: 1rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s;
    -webkit-appearance: none;
    appearance: none;
    min-height: 44px;
    width: 100%;
}

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

.entry-form button {
    padding: 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    min-height: 48px;
    touch-action: manipulation;
    -webkit-appearance: none;
    appearance: none;
}

.entry-form button:hover, .entry-form button:active {
    background: var(--primary-dark);
}

.fuel-extras {
    background: var(--bg);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.receipt-upload {
    margin-top: 1rem;
}

.receipt-upload label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text);
    font-weight: 500;
}

.receipt-upload input[type="file"] {
    width: 100%;
    padding: 0.75rem;
    border: 2px dashed var(--border);
    border-radius: 0.5rem;
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
}

.receipt-upload input[type="file"]:hover {
    border-color: var(--primary);
}

.receipt-preview {
    margin-top: 0.5rem;
}

.receipt-preview img {
    max-width: 200px;
    max-height: 200px;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.receipt-display {
    margin-top: 1rem;
    text-align: center;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.receipt-display img {
    max-width: 200px;
    max-height: 300px;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    cursor: pointer;
    margin: 20px 0;
}

.entries-section {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto;
}

.entries-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text);
}

.entries-list {
    display: grid;
    gap: 1rem;
}

.entry-item {
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: var(--bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    gap: 0.75rem;
    min-height: 120px;
}

.entry-top-section {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.entry-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}


.entry-thumbnail-section {
    width: 80px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.entry-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin-top: 0.5rem;
}

.entry-item:has(.income) {
    flex-direction: column;
}

.entry-item:has(.income) .entry-info {
    align-items: flex-start;
}

.edit-btn, .delete-btn {
    padding: 0.5rem 0.75rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.8rem;
    cursor: pointer;
    font-weight: 500;
    min-height: 36px;
    min-width: 60px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

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

.edit-btn:hover, .edit-btn:active {
    background: #b45309;
}

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

.delete-btn:hover, .delete-btn:active {
    background: #b91c1c;
}

.entry-date {
    color: var(--text-muted);
    font-size: 0.875rem;
    min-width: 80px;
}

.entry-details {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.entry-receipt-thumbnail {
    width: 80px;
    height: 60px;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    object-fit: cover;
    cursor: pointer;
    flex-shrink: 0;
}

.entry-receipt-thumbnail:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.entry-description {
    font-weight: 500;
    color: var(--text);
}

.entry-category {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: capitalize;
}

.entry-amount {
    font-weight: 600;
    font-size: 1.125rem;
}

.entry-amount.income {
    color: var(--success);
}

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

.reports-section {
    max-width: 1000px;
    margin: 0 auto;
}

.reports-section h2 {
    margin-bottom: 2rem;
    color: var(--text);
    text-align: center;
}

.report-controls {
    margin-bottom: 2rem;
    text-align: center;
}

.report-controls select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1rem;
    background: var(--card-bg);
}

.report-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.report-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
}

.report-card h3 {
    margin-bottom: 1.5rem;
    color: var(--text);
}

.report-stats {
    display: grid;
    gap: 1rem;
}

.category-list {
    display: grid;
    gap: 0.75rem;
}

.category-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.category-name {
    font-weight: 500;
    color: var(--text);
    text-transform: capitalize;
}

.category-amount {
    font-weight: 600;
    color: var(--primary);
}


@media (max-width: 768px) {
    .dashboard-grid,
    .report-summary {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .entry-item {
        grid-template-columns: 1fr;
        text-align: left;
        gap: 0.75rem;
    }
    
    .entry-actions {
        justify-content: center;
        margin-top: 0.5rem;
    }
    
    .tab-nav {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .tab-nav::-webkit-scrollbar {
        display: none;
    }
    
    .tab-content {
        padding: 1rem;
    }
    
    .form-section {
        margin-bottom: 1rem;
        padding: 1.5rem;
    }
    
    .entries-section {
        padding: 1.5rem;
    }
    
    header {
        padding: 1rem;
    }
    
    .auth-container {
        margin: 1rem;
        padding: 2rem;
    }
}

/* iOS Safari specific fixes */
@supports (-webkit-touch-callout: none) {
    .entry-form input[type="number"],
    .entry-form input[type="date"],
    .entry-form input[type="text"] {
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    .tab-nav {
        padding-bottom: env(safe-area-inset-bottom);
    }
}

.hidden {
    display: none !important;
}

/* Edit Modal Styles */
.edit-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.edit-modal-content {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.edit-modal h3 {
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--primary);
}

.edit-form-group {
    margin-bottom: 1rem;
}

.edit-form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text);
}

.edit-form-group input,
.edit-form-group select,
.edit-form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 0.5rem;
    background: var(--bg);
    color: var(--text);
    font-size: 1rem;
}

.edit-form-group textarea {
    resize: vertical;
    min-height: 3rem;
}

.edit-modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.edit-modal-actions button {
    flex: 1;
    padding: 0.75rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.edit-save-btn {
    background: var(--success);
    color: white;
}

.edit-save-btn:hover {
    background: var(--success-dark);
}

.edit-cancel-btn {
    background: var(--border);
    color: var(--text);
}

.edit-cancel-btn:hover {
    background: var(--text-muted);
}

/* Image Modal Styles */
.image-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.image-modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-modal-close {
    position: absolute;
    top: -50px;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    z-index: 2001;
}

.image-modal-close:hover {
    background: rgba(255, 255, 255, 1);
}

.image-modal img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 0.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Tax Estimation Styles */
.tax-method-selector {
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.tax-method-selector label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
}

.tax-method-selector input[type="radio"] {
    margin: 0;
}

.tax-settings {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tax-rate-input,
.mileage-rate-input {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.tax-rate-input label,
.mileage-rate-input label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.tax-rate-input input,
.mileage-rate-input input {
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    background: var(--bg);
    color: var(--text);
    width: 120px;
}

.tax-results {
    border-top: 1px solid var(--border);
    padding-top: 1rem;
}

.mobile-text {
    display: none;
}

.desktop-text {
    display: inline;
}

.receipt-remove-btn {
    background: var(--danger);
    color: white;
    border: none;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    cursor: pointer;
    margin-left: 0.5rem;
}

.receipt-remove-btn:hover {
    background: #c53030;
}

@media (max-width: 768px) {
    .mobile-text {
        display: inline;
    }
    
    .desktop-text {
        display: none;
    }
    
    .tax-method-selector {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .tax-settings {
        flex-direction: column;
        gap: 0.75rem;
    }
}

.settings-section {
    max-width: 600px;
    margin: 0 auto;
}

.settings-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.settings-card h3 {
    color: var(--text);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.settings-card h4 {
    color: var(--text);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.message {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-top: 1rem;
    font-weight: 500;
}

.message.success {
    background: #dcfce7;
    color: var(--success);
    border: 1px solid #bbf7d0;
}

.message.error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

/* Upload Loading States */

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top: 2px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}

.expense-uploading {
    opacity: 0.7;
}


@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Trends Button */
.trends-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.trends-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

/* Trends Modal */
.trends-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 1rem;
}

.trends-modal.hidden {
    display: none;
}

.trends-modal-content {
    background: var(--card-bg);
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.trends-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.trends-modal-header h3 {
    margin: 0;
    color: var(--text);
    font-size: 1.25rem;
}

.trends-modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: 0.25rem;
    transition: all 0.2s ease;
}

.trends-modal-close:hover {
    background: var(--border);
    color: var(--text);
}

.trends-modal-body {
    padding: 1.5rem;
    flex: 1;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.trends-loading {
    text-align: center;
    color: var(--text-muted);
}

.trends-loading .spinner {
    width: 24px;
    height: 24px;
    border-width: 3px;
    margin-right: 0;
    margin-bottom: 1rem;
}

.trends-chart-container {
    width: 100%;
    height: 400px;
    position: relative;
}

.trends-chart-container.hidden {
    display: none;
}

.trends-error {
    text-align: center;
    color: var(--danger);
    padding: 2rem;
}

.trends-error.hidden {
    display: none;
}

/* Mobile Responsiveness for Trends Modal */
@media (max-width: 768px) {
    .trends-modal-content {
        max-width: 100%;
        max-height: 100vh;
        border-radius: 0;
        margin: 0;
    }
    
    .trends-modal-header {
        padding: 1rem;
    }
    
    .trends-modal-header h3 {
        font-size: 1.1rem;
    }
    
    .trends-modal-body {
        padding: 1rem;
        min-height: 300px;
    }
    
    .trends-chart-container {
        height: 300px;
    }
}