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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f5f5;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Mobile-first approach */
.container {
    max-width: 100%;
    margin: 0 auto;
    background: white;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 15px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: none; /* Hidden on mobile */
}

.header h1 {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.header p {
    opacity: 0.9;
    font-size: 0.85rem;
}

/* Summary Cards - Mobile Stack */
.summary {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 15px;
    background: #f8f9fa;
}

.summary-card {
    background: white;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.summary-card h3 {
    font-size: 0.75rem;
    color: #6c757d;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 5px;
}

.summary-card .amount {
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
}

/* Mobile: Stack form and list vertically */
.content {
    display: flex;
    flex-direction: column;
    padding: 0;
    gap: 0;
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* Add Expense Form - Overlay on mobile, sidebar on desktop */
.add-expense {
    background: white;
    padding: 20px 15px;
    position: fixed;
    bottom: -100%;
    left: 0;
    right: 0;
    z-index: 150;
    box-shadow: 0 -2px 20px rgba(0,0,0,0.2);
    max-height: 85vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 20px 20px 0 0;
    transition: bottom 0.3s ease-in-out;
}

.add-expense.active {
    bottom: 0;
}

.form-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.close-form {
    display: block;
    font-size: 32px;
    color: #aaa;
    cursor: pointer;
    line-height: 1;
    padding: 0 5px;
}

.close-form:active {
    color: #000;
}

.add-expense h2 {
    margin-bottom: 0;
    color: #333;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.add-expense h2::before {
    content: "➕";
    display: none;
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #495057;
    font-weight: 500;
    font-size: 0.85rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #dee2e6;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s;
    -webkit-appearance: none;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

/* Compact button grid for mobile */
.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 12px;
}

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.btn-primary {
    background: #667eea;
    color: white;
    grid-column: 1 / -1; /* Full width */
}

.btn-primary::before {
    content: "💾";
}

.btn-primary:active {
    background: #5568d3;
    transform: scale(0.98);
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success::before {
    content: "📊";
}

.btn-success:active {
    background: #218838;
    transform: scale(0.98);
}

.btn-info {
    background: #17a2b8;
    color: white;
}

.btn-info::before {
    content: "📷";
}

.btn-info:active {
    background: #138496;
    transform: scale(0.98);
}

.btn-warning {
    background: #ffc107;
    color: #212529;
}

.btn-warning::before {
    content: "📥";
}

.btn-warning:active {
    background: #e0a800;
    transform: scale(0.98);
}

.btn-danger {
    background: #dc3545;
    color: white;
    grid-column: 1 / -1; /* Full width */
}

.btn-danger::before {
    content: "🗑️";
}

.btn-danger:active {
    background: #c82333;
    transform: scale(0.98);
}

/* Expense List */
.expense-list {
    background: #f8f9fa;
    padding: 15px;
    padding-bottom: 100px; /* Space for FAB */
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.expense-list h2 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.expense-list h2::before {
    content: "📝";
}

.filter-group {
    margin-bottom: 15px;
}

.filter-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid #dee2e6;
    border-radius: 10px;
    font-size: 0.95rem;
    background: white;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 35px;
}

.expenses {
    max-height: none;
    overflow-y: visible;
}

/* Prevent body scroll when modals are open */
body.modal-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
}

/* Floating Action Button (Mobile Only) */
.fab {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    cursor: pointer;
    z-index: 100;
    font-size: 32px;
    font-weight: 300;
    transition: all 0.3s ease;
}

.fab:active {
    transform: scale(0.95);
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.6);
}

.fab span {
    line-height: 1;
}

/* Form Overlay Background (Mobile Only) */
.form-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 140;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.form-overlay.active {
    display: block;
    opacity: 1;
}

.expense-item {
    background: white;
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    animation: slideIn 0.3s ease;
    position: relative;
}

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

.expense-details {
    flex: 1;
    margin-bottom: 10px;
}

.expense-amount {
    font-size: 1.5rem;
    font-weight: bold;
    color: #dc3545;
    margin-bottom: 5px;
}

.expense-description {
    color: #495057;
    font-size: 1rem;
    margin-bottom: 8px;
    font-weight: 500;
}

.expense-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 0.85rem;
    color: #6c757d;
    align-items: center;
}

.category-badge {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.category-food { background: #ffeaa7; color: #d63031; }
.category-transport { background: #74b9ff; color: #0984e3; }
.category-entertainment { background: #a29bfe; color: #6c5ce7; }
.category-shopping { background: #fd79a8; color: #e84393; }
.category-bills { background: #fab1a0; color: #e17055; }
.category-salon { background: #fdcb6e; color: #e17055; }
.category-other { background: #dfe6e9; color: #2d3436; }

.delete-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.3s;
    width: 100%;
    margin-top: 10px;
}

.delete-btn:active {
    background: #c82333;
    transform: scale(0.98);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #6c757d;
}

.empty-state p:first-child {
    font-size: 3rem;
}

.empty-state p:last-child {
    font-size: 1.1rem;
    margin-top: 15px;
}

.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 15px;
    display: none;
    font-size: 0.9rem;
}

/* Modal Styles - Mobile Optimized */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
    overflow-y: auto;
}

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

.modal-content {
    background-color: white;
    margin: 50px auto;
    padding: 25px 20px;
    border-radius: 15px;
    width: 90%;
    max-width: 400px;
    position: relative;
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-content h2 {
    margin-bottom: 10px;
    color: #333;
    font-size: 1.3rem;
}

.modal-content p {
    color: #6c757d;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 20px;
}

.close:hover,
.close:focus {
    color: #000;
}

#qrCodeContainer {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
}

#qrCodeContainer canvas,
#qrCodeContainer img {
    max-width: 100%;
    height: auto;
}

#qrFileInput {
    width: 100%;
    padding: 12px;
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    margin: 15px 0;
    cursor: pointer;
}

#importStatus {
    padding: 15px;
    border-radius: 8px;
    margin-top: 15px;
    display: none;
    font-size: 0.9rem;
}

#importStatus.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

#importStatus.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

/* QR Progress Indicator */
.qr-progress {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.progress-dot {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: #e9ecef;
    color: #6c757d;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.progress-dot:hover {
    background: #dee2e6;
    transform: scale(1.1);
}

.progress-dot.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: #667eea;
    transform: scale(1.15);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.progress-arrow {
    color: #adb5bd;
    font-size: 1.2rem;
    font-weight: bold;
}

/* QR Navigation Buttons */
.qr-navigation {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    flex-wrap: wrap;
}

.qr-navigation .btn {
    flex: 1;
    min-width: 120px;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:active {
    background: #5a6268;
    transform: scale(0.98);
}

/* Loading Spinner */
.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

/* QR Code Display */
#qrCodeDisplay {
    padding: 20px;
    background: #f8f9fa;
    border-radius: 10px;
    display: inline-block;
}

#qrCodeDisplay canvas,
#qrCodeDisplay img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* Export/Import Option Cards */
.export-import-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.option-card {
    background: white;
    border: 2px solid #dee2e6;
    border-radius: 12px;
    padding: 25px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
}

.option-card:hover {
    border-color: #667eea;
    background: #f8f9ff;
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.2);
}

.option-card:active {
    transform: translateY(-1px);
}

.option-icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.option-title {
    font-weight: 600;
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 5px;
}

.option-desc {
    font-size: 0.85rem;
    color: #6c757d;
}

/* QR Scanner Styles */
#qrScannerContainer {
    text-align: center;
    margin: 20px 0;
}

#qrVideo {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    border: 2px solid #667eea;
}

#qrScanStatus {
    padding: 15px;
    border-radius: 8px;
    display: none;
}

#qrScanStatus.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

#qrScanStatus.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

/* Import Options */
.import-options {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.import-options .btn {
    flex: 1;
    min-width: 140px;
}

/* Camera Preview */
#cameraPreview {
    margin: 20px 0;
    text-align: center;
}

#qrVideo {
    width: 100%;
    max-width: 400px;
    border-radius: 10px;
    border: 2px solid #667eea;
    margin-bottom: 15px;
}

#stopCameraBtn {
    width: 100%;
    max-width: 400px;
}

/* Desktop Responsive - Only activate on larger screens */
@media (min-width: 768px) {
    body {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        padding: 20px;
    }

    .container {
        max-width: 1000px;
        border-radius: 20px;
        box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        overflow: hidden;
    }

    .header {
        display: block; /* Show on desktop */
        position: static;
        padding: 30px;
    }

    .header h1 {
        font-size: 2rem;
        margin-bottom: 10px;
    }

    .header p {
        font-size: 0.95rem;
    }

    .summary {
        grid-template-columns: repeat(3, 1fr);
        gap: 20px;
        padding: 30px;
    }

    .summary-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .summary-card .amount {
        font-size: 1.8rem;
    }

    .content {
        flex-direction: row;
        padding: 30px;
        gap: 30px;
    }

    /* Desktop: Restore sidebar style */
    .add-expense {
        position: static;
        flex: 0 0 350px;
        height: fit-content;
        max-height: none;
        background: #f8f9fa;
        border-radius: 12px;
        box-shadow: none;
        transition: none;
        bottom: auto;
        left: auto;
        right: auto;
        padding: 25px;
    }

    .add-expense.active {
        bottom: auto;
    }

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

    .close-form {
        display: none; /* Hide close button on desktop */
    }

    .add-expense h2 {
        font-size: 1.3rem;
    }

    .add-expense h2::before {
        display: inline; /* Show emoji on desktop */
    }

    .button-grid {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    .btn {
        font-size: 1rem;
    }

    .btn-primary,
    .btn-danger {
        grid-column: auto;
    }

    .expense-list {
        flex: 1;
        padding: 25px;
        padding-bottom: 25px;
        border-radius: 12px;
        min-height: auto;
    }

    .expense-list h2 {
        font-size: 1.3rem;
    }

    .expenses {
        max-height: 500px;
        overflow-y: auto;
    }

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

    .expense-details {
        margin-bottom: 0;
    }

    .delete-btn {
        width: auto;
        margin-top: 0;
        padding: 8px 16px;
    }

    .btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }

    .delete-btn:hover {
        background: #c82333;
    }

    /* Hide FAB and overlay on desktop */
    .fab {
        display: none;
    }

    .form-overlay {
        display: none !important;
    }

    /* Desktop modal improvements */
    .modal-content {
        margin: 80px auto;
        max-width: 500px;
        padding: 35px 30px;
    }

    .modal-content h2 {
        font-size: 1.5rem;
    }
}

/* Large Desktop */
@media (min-width: 1200px) {
    .container {
        max-width: 1200px;
    }
}