/* ==========================================================================
   Doors & Windows Calculator - Professional Styling
   ========================================================================== */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #6B4F3A;
    --primary-dark: #6B4F3A;
    --primary-light: #42a5f5;
    --secondary-color: #ff6f00;
    --secondary-dark: #D4B896;
    --success-color: #D4B896;
    --danger-color: #e53935;
    --warning-color: #fb8c00;
    
    /* Neutral Colors */
    --dark: #212121;
    --dark-gray: #424242;
    --medium-gray: #757575;
    --light-gray: #e0e0e0;
    --lighter-gray: #f5f5f5;
    --white: #ffffff;
    
    /* Accent Colors */
    --window-accent: #1976d2;
    --door-accent: #6d4c41;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding-bottom: var(--spacing-2xl);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================================================
   Header
   ========================================================================== */
.header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
    color: var(--white);
    padding: var(--spacing-xl) 0;
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.logo i {
    font-size: 2.5rem;
    animation: swing 2s ease-in-out infinite;
}

@keyframes swing {
    0%, 100% { transform: rotate(0deg); }
    25% { transform: rotate(-5deg); }
    75% { transform: rotate(5deg); }
}

.logo h1 {
     font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.95;
    font-weight: 300;
}

/* ==========================================================================
   Main Content
   ========================================================================== */
.main-content {
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

/* ==========================================================================
   Tab Navigation
   ========================================================================== */
.tab-navigation {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    border-bottom: 2px solid var(--light-gray);
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    color: var(--medium-gray);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    position: relative;
    bottom: -2px;
}

.tab-btn i {
    font-size: 1.2rem;
}

.tab-btn:hover {
    color: var(--primary-color);
    background: var(--lighter-gray);
}

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

/* ==========================================================================
   Tab Content
   ========================================================================== */
.tab-content {
    display: none;
    animation: fadeIn var(--transition-normal);
}

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

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.section-title i {
    color: var(--primary-color);
}

/* ==========================================================================
   Calculator Grid
   ========================================================================== */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

/* ==========================================================================
   Calculator Form
   ========================================================================== */
.calculator-form {
    background: var(--lighter-gray);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--light-gray);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.form-group label i {
    color: var(--primary-color);
    font-size: 1rem;
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1rem;
    border: 2px solid var(--light-gray);
    border-radius: var(--radius-md);
    background: var(--white);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.form-control:hover {
    border-color: var(--medium-gray);
}

.help-text {
    display: block;
    font-size: 0.85rem;
    color: var(--medium-gray);
    margin-top: var(--spacing-xs);
    font-style: italic;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    font-family: inherit;
}

.btn i {
    font-size: 1.1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    width: 100%;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
    background: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

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

.btn-danger:hover {
    background: var(--secondary-dark);
    transform: translateY(-2px);
}

/* ==========================================================================
   Diagram Container
   ========================================================================== */
.diagram-container {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--light-gray);
    overflow-y: auto;
    max-height: 800px;
}

.diagram-container h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.diagram-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.diagram-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--lighter-gray);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.diagram-item:hover {
    background: var(--white);
    border-color: var(--primary-color);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.diagram-item.selected {
    background: var(--primary-light);
    border-color: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

.diagram-visual {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.diagram-item p {
    font-weight: 600;
    color: var(--dark-gray);
    font-size: 0.9rem;
}

.window-svg, .door-svg {
    width: 100%;
    height: 100%;
}

/* ==========================================================================
   Info Sections
   ========================================================================== */
.glazing-info, .material-info {
    background: var(--lighter-gray);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.glazing-info h4, .material-info h4 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.glazing-info h4 i, .material-info h4 i {
    color: var(--primary-color);
}

.glazing-info ul, .material-info ul {
    list-style: none;
}

.glazing-info li, .material-info li {
    padding: var(--spacing-sm) 0;
    color: var(--dark-gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

.glazing-info li strong, .material-info li strong {
    color: var(--dark);
}

/* ==========================================================================
   Items List
   ========================================================================== */
.items-list {
    background: var(--lighter-gray);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--light-gray);
}

.items-list h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.items-list h3 i {
    color: var(--primary-color);
}

.items-container {
    display: grid;
    gap: var(--spacing-md);
}

.item-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 2px solid var(--light-gray);
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--spacing-lg);
    align-items: center;
    transition: all var(--transition-normal);
}

.item-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.item-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.item-detail {
    display: flex;
    flex-direction: column;
}

.item-detail-label {
    font-size: 0.85rem;
    color: var(--medium-gray);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.item-detail-value {
    font-size: 1rem;
    color: var(--dark);
    font-weight: 600;
}

.item-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

.item-price {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--success-color);
    margin-bottom: var(--spacing-sm);
}

.btn-remove {
    background: var(--danger-color);
    color: var(--white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn-remove:hover {
    background: var(--secondary-dark);
    transform: scale(1.05);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--medium-gray);
    font-style: italic;
}

/* ==========================================================================
   Summary & Pricing
   ========================================================================== */
.summary-grid {
    display: grid;
    gap: var(--spacing-2xl);
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.summary-card {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    color: var(--white);
    transition: all var(--transition-normal);
}

.summary-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.windows-icon {
    background: rgba(25, 118, 210, 0.3);
}

.doors-icon {
    background: rgba(109, 76, 65, 0.3);
}

.price-icon {
    background: rgba(67, 160, 71, 0.3);
}

.card-content h3 {
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.card-value {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.card-label {
    font-size: 0.85rem;
    opacity: 0.8;
}

/* ==========================================================================
   Breakdown Section
   ========================================================================== */
.breakdown-section {
    background: var(--lighter-gray);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 2px solid var(--light-gray);
}

.breakdown-section h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.breakdown-section h3 i {
    color: var(--primary-color);
}

.breakdown-category {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    border: 2px solid var(--light-gray);
}

.breakdown-category h4 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--light-gray);
}

.breakdown-items {
    margin-bottom: var(--spacing-md);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--light-gray);
}

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

.breakdown-item-info {
    flex: 1;
}

.breakdown-item-name {
    font-weight: 600;
    color: var(--dark);
    margin-bottom: var(--spacing-xs);
}

.breakdown-item-details {
    font-size: 0.9rem;
    color: var(--medium-gray);
}

.breakdown-item-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--success-color);
}

.breakdown-subtotal {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--lighter-gray);
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
}

.breakdown-subtotal strong {
    color: var(--primary-color);
    font-size: 1.3rem;
}

.breakdown-total {
    background: linear-gradient(135deg, var(--success-color) 0%, #2e7d32 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--white);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.breakdown-total h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.total-amount {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.total-note {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ==========================================================================
   Action Buttons
   ========================================================================== */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.action-buttons .btn {
    flex: 1;
    min-width: 150px;
    justify-content: center;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: rgba(0, 0, 0, 0.1);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
}

.footer p {
    margin-bottom: var(--spacing-sm);
}

.footer-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 1200px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .diagram-container {
        max-height: 600px;
    }
}

@media (max-width: 768px) {
    body {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .logo i {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .main-content {
        padding: var(--spacing-lg);
    }
    
    .tab-navigation {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
        justify-content: center;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .diagram-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .item-card {
        grid-template-columns: 1fr;
    }
    
    .item-actions {
        align-items: flex-start;
        flex-direction: row;
        justify-content: space-between;
        width: 100%;
    }
    
    .summary-cards {
        grid-template-columns: 1fr;
    }
    
    .card-value {
        font-size: 2rem;
    }
    
    .total-amount {
        font-size: 2.5rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.5rem;
    }
    
    .item-details {
        grid-template-columns: 1fr;
    }
    
    .diagram-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   Print Styles
   ========================================================================== */
@media print {
    body {
        background: var(--white);
    }
    
    .header, .footer, .tab-navigation, .calculator-form, .diagram-container, .action-buttons {
        display: none;
    }
    
    .main-content {
        box-shadow: none;
        padding: 0;
    }
    
    .tab-content {
        display: block !important;
    }
    
    .summary-card, .breakdown-category {
        break-inside: avoid;
    }
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.item-card {
    animation: slideIn var(--transition-normal);
}

/* ==========================================================================
   Accessibility
   ========================================================================== */
*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --light-gray: #999;
        --medium-gray: #666;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}