/* Modern POS System Styling */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --bg-light: #f8fafc;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-dark);
}

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

header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 10px;
    letter-spacing: -1px;
}

header p {
    font-size: 1.25rem;
    opacity: 0.95;
    font-weight: 500;
}

.main-content {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    padding: 40px;
}

.section {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
}

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

.section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s;
    background: white;
}

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

.form-group small {
    display: block;
    margin-top: 8px;
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Custom checkbox styling */
.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 12px;
    transform: scale(1.3);
    accent-color: var(--primary-color);
    cursor: pointer;
}

.form-group label:has(input[type="checkbox"]) {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    margin-bottom: 0;
    padding: 0;
}

.form-group label:has(input[type="checkbox"]):hover {
    color: var(--primary-color);
}

/* Signature checkbox specific styling */
#signatureCheckboxGroup {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-bottom: 0;
    padding: 0;
    background: transparent;
    border: none;
    min-height: 48px;
}

/* Override any display: block that might be applied */
#signatureCheckboxGroup[style*="display: block"] {
    display: flex !important;
}

#signatureCheckboxGroup label {
    margin-bottom: 0;
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 600;
    display: flex;
    align-items: center;
    cursor: pointer;
    width: 100%;
    padding: 12px 0;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow);
    width: 100%;
    padding: 16px;
    font-size: 1.125rem;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

.btn-secondary:hover {
    background: var(--secondary-hover);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success-color);
    color: white;
    box-shadow: var(--shadow);
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
}

.btn-success:hover {
    background: var(--success-hover);
    transform: translateY(-1px);
}

.btn-danger {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    transition: all 0.2s ease;
    margin-bottom: 25px;
}

.btn-danger:hover {
    background: #c82333;
    transform: translateY(-1px);
}

/* Items Section */
#itemsList {
    margin-bottom: 20px;
}

.item-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr 60px;
    gap: 12px;
    align-items: end;
    margin-bottom: 12px;
    padding: 16px;
    background: var(--bg-light);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.item-row label {
    font-weight: 600;
    margin-bottom: 4px;
    display: block;
    font-size: 0.875rem;
}

.item-row input {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95rem;
}

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

.remove-item-btn {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 10px 12px;
    cursor: pointer;
    font-size: 1.25rem;
    transition: all 0.2s;
}

.remove-item-btn:hover {
    background: #dc2626;
    transform: scale(1.05);
}

/* Total Preview */
.total-preview {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    padding: 24px;
    border-radius: 12px;
    border: 2px solid #667eea30;
}

.total-preview h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.total-line {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    font-size: 1rem;
    color: var(--text-dark);
}

.total-line.total-amount {
    border-top: 2px solid #667eea;
    margin-top: 8px;
    padding-top: 16px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Success Message */
.success-message {
    background: white;
    border-radius: 12px;
    padding: 32px;
    margin-top: 32px;
    border-left: 6px solid var(--success-color);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.success-message h3 {
    color: var(--success-color);
    font-size: 1.75rem;
    margin-bottom: 16px;
    font-weight: 700;
}

.success-message p {
    color: var(--text-light);
    margin-bottom: 24px;
    font-size: 1rem;
}

.button-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

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

.success-message {
    animation: fadeIn 0.3s ease-out;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.3s ease-out, visibility 0.3s ease-out;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-spinner {
    text-align: center;
    color: white;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 6px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loading-text {
    font-size: 1.25rem;
    font-weight: 600;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    margin: 0;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2.5rem;
    }

    .main-content {
        padding: 24px;
    }

    .item-row {
        grid-template-columns: 1fr;
    }

    .button-group {
        grid-template-columns: 1fr;
    }

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