:root {
    --primary-color: #184D5A;
    --secondary-color: #2980b9;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --shadow-light: rgba(0, 0, 0, 0.08);
    --shadow-medium: rgba(0, 0, 0, 0.12);
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius: 8px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
}

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

*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
    line-height: 1.5;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding: 0;
    margin: 0;
}

/* Typography */
h1, h2, h3 {
    color: var(--primary-color);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin: var(--spacing-md) 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(24, 77, 90, 0.1);
    position: relative;
}

h1::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 2px;
}

@media (min-width: 768px) {
    h1 {
        font-size: 1.875rem;
        font-weight: 800;
        margin: var(--spacing-lg) 0;
    }
    
    h1::after {
        width: 80px;
        height: 4px;
    }
}

/* Header */
.header {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 249, 250, 0.95) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
}

@media (min-width: 768px) {
    .header {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

/* Layout */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    max-width: 100%;
    margin: 0 auto;
    width: 100%;
}

@media (min-width: 768px) {
    .main-content {
        grid-template-columns: 380px 1fr;
        gap: var(--spacing-lg);
        padding: var(--spacing-lg);
        width: 95%;
        max-width: none;
    }
}

/* Enhanced Language Selector */
.language-selector {
    position: fixed;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    z-index: 1000;
}

.language-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-color);
    box-shadow: 0 2px 8px var(--shadow-light);
}

.language-toggle:hover {
    background: var(--bg-color);
    border-color: var(--primary-color);
}

.language-toggle .dropdown-arrow {
    transition: transform 0.2s ease;
}

.language-toggle.active .dropdown-arrow {
    transform: rotate(180deg);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-xs);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 16px var(--shadow-medium);
    min-width: 140px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
}

.language-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm);
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.875rem;
    border-radius: 0;
}

.lang-option:first-child {
    border-top-left-radius: var(--border-radius);
    border-top-right-radius: var(--border-radius);
}

.lang-option:last-child {
    border-bottom-left-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
}

.lang-option:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

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

.lang-flag {
    width: 16px;
    height: 12px;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
    border-radius: 2px;
}

/* Old language selector styles to remove */
.lang-btn {
    display: none;
}

/* Enhanced Piece Cards - 2 Row Layout */
.pieces-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xs);
}

.piece-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: var(--spacing-sm);
    transition: var(--transition);
    box-shadow: 0 1px 3px var(--shadow-light);
    position: relative;
    overflow: hidden;
}

.piece-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.piece-card:hover {
    box-shadow: 0 2px 8px var(--shadow-medium);
    transform: translateY(-1px);
    border-color: var(--primary-color);
}

/* Row 1: Size + Buttons */
.piece-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xs);
    gap: var(--spacing-xs);
}

.piece-dimensions {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.piece-dimensions svg {
    color: var(--primary-color);
    flex-shrink: 0;
    width: 12px;
    height: 12px;
}

.dimensions-text {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.8rem;
}

.piece-name {
    background: linear-gradient(135deg, var(--success-color), #229954);
    color: white;
    padding: 2px 6px;
    border-radius: 8px;
    font-size: 0.65rem;
    font-weight: 500;
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    box-shadow: 0 1px 2px rgba(39, 174, 96, 0.2);
}

.piece-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.btn-simple {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background: white;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.btn-simple::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.btn-simple:hover::before {
    width: 35px;
    height: 35px;
}

.btn-simple svg {
    z-index: 1;
    position: relative;
    width: 11px;
    height: 11px;
}

.btn-add {
    border-color: var(--success-color);
    color: var(--success-color);
}

.btn-add:hover {
    background: var(--success-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(39, 174, 96, 0.3);
}

.btn-subtract {
    border-color: var(--warning-color);
    color: var(--warning-color);
}

.btn-subtract:hover:not(:disabled) {
    background: var(--warning-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(243, 156, 18, 0.3);
}

.btn-subtract:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    border-color: var(--border-color);
    color: var(--text-light);
}

.btn-remove-all {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.btn-remove-all:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 3px 6px rgba(231, 76, 60, 0.3);
}

/* Row 2: Count + Area */
.piece-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 8px;
    background: var(--bg-color);
    border-radius: 4px;
    gap: var(--spacing-sm);
}

.info-row {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.info-label {
    font-size: 0.7rem;
    color: var(--text-light);
    font-weight: 500;
}

.info-value {
    font-size: 0.75rem;
    color: var(--text-color);
    font-weight: 600;
}

/* Compact Summary Stats */
.summary-stats {
    display: flex;
    gap: var(--spacing-sm);
    padding: 6px var(--spacing-sm);
    background: linear-gradient(135deg, var(--bg-color) 0%, #f1f3f4 100%);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-sm);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.stat-item svg {
    color: var(--primary-color);
    flex-shrink: 0;
    width: 12px;
    height: 12px;
}

.stat-label {
    font-size: 0.65rem;
    color: var(--text-light);
    font-weight: 500;
}

.stat-value {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-color);
}

@media (max-width: 767px) {
    .summary-stats {
        flex-direction: column;
        gap: 4px;
        padding: 6px;
    }
    
    .piece-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .piece-actions {
        align-self: stretch;
        justify-content: space-around;
    }
    
    .piece-info {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }
    
    .info-row {
        justify-content: space-between;
    }
}

/* Compact control panel */
.control-panel {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: 0 2px 8px var(--shadow-light);
    border: 1px solid var(--border-color);
    height: fit-content;
}

.panel-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0;
    color: var(--primary-color);
    font-size: 1rem;
}

.divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
    margin: var(--spacing-md) 0;
}

.sheet-config, .piece-input, .piece-list-section {
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.section-title h3 {
    margin: 0;
    font-size: 0.8rem;
    color: var(--text-color);
    font-weight: 600;
}

.section-title svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

/* Enhanced Piece Input Section */
.piece-form-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--spacing-sm);
    align-items: end;
}

/* Specific positioning for form elements */
/* Name (1st child) goes to row 2, col 1 */
.input-grid .input-group:nth-child(1) { 
    grid-column: 1;
    grid-row: 2;
}

/* Width (2nd child) goes to row 1, col 1 */
.input-grid .input-group:nth-child(2) { 
    grid-column: 1;
    grid-row: 1;
}

/* Height (3rd child) goes to row 1, col 2 */
.input-grid .input-group:nth-child(3) { 
    grid-column: 2;
    grid-row: 1;
}

/* Quantity (4th child) goes to row 2, col 2 */
.input-grid .input-group:nth-child(4) { 
    grid-column: 2;
    grid-row: 2;
}

@media (max-width: 767px) {
    .input-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto auto;
        gap: var(--spacing-xs);
    }
    
    /* Mobile: Width first */
    .input-grid .input-group:nth-child(2) { 
        grid-column: 1;
        grid-row: 1;
    }

    /* Mobile: Height second */
    .input-grid .input-group:nth-child(3) { 
        grid-column: 1;
        grid-row: 2;
    }

    /* Mobile: Name third */
    .input-grid .input-group:nth-child(1) { 
        grid-column: 1;
        grid-row: 3;
    }

    /* Mobile: Quantity fourth */
    .input-grid .input-group:nth-child(4) { 
        grid-column: 1;
        grid-row: 4;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.input-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-color);
}

.input-group label svg {
    color: var(--text-light);
    flex-shrink: 0;
}

.form-input {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    transition: var(--transition);
    background: white;
    height: 34px;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(24, 77, 90, 0.1);
}

.form-input::placeholder {
    color: var(--text-light);
    font-size: 0.7rem;
}

/* Compact Piece Preview */
.piece-preview {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.preview-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.preview-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-color);
}

.piece-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 120px;
    background: white;
    border: 1px dashed var(--border-color);
    border-radius: var(--border-radius);
    position: relative;
    overflow: hidden;
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-light);
    font-size: 0.75rem;
}

.preview-placeholder svg {
    opacity: 0.5;
}

.piece-rectangle {
    background: var(--primary-color);
    opacity: 0.8;
    border-radius: 2px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.625rem;
    font-weight: 600;
    transition: var(--transition);
    min-width: 20px;
    min-height: 15px;
}

.piece-rectangle:hover {
    opacity: 1;
    transform: scale(1.05);
}

.preview-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs);
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
}

.preview-info.hidden {
    display: none;
}

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

.info-item .label {
    color: var(--text-light);
    font-weight: 500;
}

.info-item span:last-child {
    font-weight: 600;
    color: var(--text-color);
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-xs);
}

@media (max-width: 767px) {
    .form-actions {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-xs);
    }
}

/* Quick Add Section */
/* Legacy quick-add-section - remove this */
/* .quick-add-section {
    flex: 1;
} */

.quick-add-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: var(--spacing-xs);
}

.quick-add-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--spacing-xs);
    justify-items: stretch;
    align-items: stretch;
}

.quick-add-btn {
    font-size: 0.6rem;
    padding: var(--spacing-xs);
    min-width: auto;
    height: 26px;
    text-align: center;
    justify-self: stretch;
    position: relative;
    overflow: hidden;
    transition: all 0.2s ease;
}

.quick-add-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.quick-add-btn.active {
    transform: scale(0.95);
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.quick-add-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s ease;
}

.quick-add-btn.active::after {
    width: 100px;
    height: 100px;
}

@media (max-width: 767px) {
    .quick-add-buttons {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto auto;
    }
}

.btn-outline {
    background: rgb(235, 235, 235);
    border: 1.5px solid var(--border-color);
    color: var(--text-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(24, 77, 90, 0.3);
}

.btn-outline:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Form Actions */
.form-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: flex-start; /* Ensure left alignment */
}

/* Quick Add Section */
.quick-add-section {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start; /* Left align quick add section */
}

/* Add Actions Row */
.add-actions-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

.swap-section {
    display: flex;
    align-items: center;
}

/* Deprecated - keeping for backward compatibility */
.add-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: stretch;
}

.add-actions .btn-group {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
    justify-content: flex-end;
}

#swap-dimensions {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    flex-shrink: 0;
}

.btn-add-piece {
    flex: 1;
    height: 36px;
    padding: 0 var(--spacing-md);
    font-size: 0.8rem;
    font-weight: 600;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.btn-add-piece.pulse-hint {
    animation: pulseHint 1s ease-in-out 2;
}

@keyframes pulseHint {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(24, 77, 90, 0.7);
    }
    70% {
        transform: scale(1.02);
        box-shadow: 0 0 0 8px rgba(24, 77, 90, 0);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(24, 77, 90, 0);
    }
}

@media (max-width: 767px) {
    .add-actions-row {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: stretch;
    }
    
    .swap-section {
        justify-content: center;
    }
    
    .btn-add-piece {
        height: 40px;
        font-size: 0.85rem;
    }
    
    /* Legacy responsive styles */
    .add-actions {
        gap: var(--spacing-sm);
    }
    
    .add-actions .btn-group {
        justify-content: center;
    }
}

/* Enhanced Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-light);
    background: var(--bg-color);
    border-radius: var(--border-radius);
}

.empty-state svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.6;
}

.empty-state p {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.empty-state small {
    font-size: 0.75rem;
    opacity: 0.8;
}

/* Enhanced Results Panel */
.results-title-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.layout-actions {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.view-controls, .export-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Enhanced Loading State */
.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.loading-text {
    text-align: center;
}

.loading-progress {
    width: 200px;
    margin-top: var(--spacing-sm);
}

.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* Enhanced Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-md);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.stat-item svg {
    color: var(--primary-color);
    flex-shrink: 0;
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-light);
    margin-bottom: 2px;
}

.stat-value {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-color);
}

/* Enhanced No Results */
.no-results-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.no-results-content svg {
    margin-bottom: var(--spacing-lg);
    opacity: 0.4;
    color: var(--text-light);
}

.no-results-content h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
    font-size: 1.125rem;
}

.no-results-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    align-items: flex-start;
}

.step {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-light);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}
.panel-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--bg-color);
}

.panel-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0;
    color: var(--primary-color);
    font-size: 1.125rem;
}

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

.section-title h3 {
    margin: 0;
    font-size: 1rem;
    color: var(--text-color);
}

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

.divider {
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
    margin: var(--spacing-lg) 0;
}

.config-grid {
    display: grid;
    gap: var(--spacing-sm);
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    align-items: end;
}

@media (max-width: 767px) {
    .config-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(4, auto);
        gap: var(--spacing-xs);
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .config-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
    }
}

.add-button-group {
    display: flex;
    align-items: end;
}

.btn-add-piece, .btn-calculate {
    width: 100%;
    justify-content: center;
    font-weight: 600;
}

.calculate-section {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}
.control-panel {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow-light);
    border: 1px solid var(--border-color);
    height: fit-content;
}

.sheet-config, .piece-input, .piece-list-section {
    margin-bottom: var(--spacing-lg);
}

.sheet-config h2, .piece-input h2 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.piece-list-section h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.config-row, .input-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
    align-items: end;
}

@media (max-width: 767px) {
    .config-row {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xs);
    }
    
    .input-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-xs);
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px var(--shadow-light);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 4px 8px var(--shadow-medium);
}

.card-compact {
    padding: var(--spacing-md);
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--card-bg);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(24, 77, 90, 0.1);
}

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

.form-control[type="number"] {
    text-align: right;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.btn svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border-color: var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-color);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

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

.btn-success:hover:not(:disabled) {
    background-color: #229954;
    border-color: #229954;
    transform: translateY(-1px);
}

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

.btn-danger:hover:not(:disabled) {
    background-color: #c0392b;
    border-color: #c0392b;
    transform: translateY(-1px);
}

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

.btn-warning:hover:not(:disabled) {
    background-color: #e67e22;
    border-color: #e67e22;
    transform: translateY(-1px);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-block {
    width: 100%;
}

/* Button groups */
.btn-group {
    display: grid;
    gap: var(--spacing-sm);
    grid-template-columns: 1fr 1fr;
}

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

/* Accordion */
.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--bg-color) 0%, #f1f3f4 100%);
    cursor: pointer;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    color: var(--text-color);
}

.accordion-header:hover {
    background: linear-gradient(135deg, #f1f3f4 0%, #e8eaed 100%);
    border-color: var(--primary-color);
}

.accordion-header .toggle-icon {
    font-size: 1.1rem;
    transition: transform 0.2s ease;
}

.accordion-header.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.accordion-content {
    display: none;
    animation: fadeIn 0.2s ease-out;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Compact Pieces List Styles */
.pieces-container {
    margin-top: var(--spacing-sm);
}

.pieces-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: white;
    margin-bottom: var(--spacing-sm);
}

/* Hierarchical Structure Styles */
.dimension-group {
    background: white;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-xs);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    overflow: hidden;
}

.dimension-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.dimension-header:hover {
    background: linear-gradient(135deg, #bbdefb 0%, #90caf9 100%);
}

.dimension-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.dimension-toggle:hover {
    transform: scale(1.1);
}

.dimension-toggle .chevron {
    transition: transform 0.3s ease;
}

.dimension-toggle.expanded .chevron {
    transform: rotate(90deg);
}

.dimension-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.dimension-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-color);
}

.dimension-meta {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.total-pieces-badge,
.total-area-badge,
.name-count-badge {
    background: rgba(33, 150, 243, 0.1);
    color: var(--primary-color);
    padding: 2px 6px;
    border-radius: 12px;
    font-size: 0.625rem;
    font-weight: 500;
}

.dimension-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.dimension-content {
    background: #f8f9fa;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.dimension-content.expanded {
    max-height: 1000px;
}

/* Name Group Styles */
.name-group {
    margin: var(--spacing-xs);
    border-radius: var(--border-radius);
    overflow: hidden;
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.unnamed-name-group {
    border-left: 3px solid #ff9800;
}

.named-name-group {
    border-left: 3px solid #4caf50;
}

.name-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, #f5f5f5 0%, #eeeeee 100%);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.name-header:hover {
    background: linear-gradient(135deg, #eeeeee 0%, #e0e0e0 100%);
}

.name-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}

.name-toggle .chevron-small {
    transition: transform 0.3s ease;
}

.name-toggle.expanded .chevron-small {
    transform: rotate(90deg);
}

.name-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    cursor: pointer;
}

.name-title {
    font-weight: 600;
    font-size: 0.75rem;
    color: var(--text-color);
}

.name-title.unnamed {
    color: #ff9800;
    font-style: italic;
}

.name-quantity {
    font-size: 0.625rem;
    color: var(--text-light);
}

.name-actions {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}

.name-content {
    background: #fafafa;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.name-content.expanded {
    max-height: 500px;
}

/* Individual Piece Styles */
.individual-piece {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs);
    margin: var(--spacing-xs);
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.individual-piece:hover {
    background: linear-gradient(135deg, #f0f8ff 0%, #e1f0ff 100%);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(33, 150, 243, 0.1);
}

.piece-icon-container {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.piece-icon {
    font-size: 0.75rem;
}

.piece-details {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.piece-main-info {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.piece-name {
    font-weight: 500;
    font-size: 0.75rem;
    color: var(--text-color);
    flex-shrink: 0;
}

.piece-dims {
    font-size: 0.625rem;
    color: var(--primary-color);
    font-weight: 600;
    background: rgba(33, 150, 243, 0.1);
    padding: 1px 4px;
    border-radius: 4px;
    flex-shrink: 0;
}

.piece-meta {
    display: flex;
    gap: var(--spacing-xs);
}

.piece-qty,
.piece-area {
    font-size: 0.625rem;
    color: var(--text-light);
}

.piece-actions {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}

/* Action Button Styles */
.btn-action {
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    background: none;
    padding: 4px;
    opacity: 0.7;
}

.btn-action:hover {
    opacity: 1;
    transform: scale(1.05);
}

.btn-add {
    background: rgba(76, 175, 80, 0.1);
    color: #4caf50;
}

.btn-add:hover {
    background: rgba(76, 175, 80, 0.2);
}

.btn-duplicate {
    background: rgba(33, 150, 243, 0.1);
    color: #2196f3;
}

.btn-duplicate:hover {
    background: rgba(33, 150, 243, 0.2);
}

.btn-remove {
    background: rgba(244, 67, 54, 0.1);
    color: #f44336;
}

.btn-remove:hover {
    background: rgba(244, 67, 54, 0.2);
}

.btn-edit-small,
.btn-edit-piece {
    background: rgba(255, 152, 0, 0.1);
    color: #ff9800;
}

.btn-edit-small:hover,
.btn-edit-piece:hover {
    background: rgba(255, 152, 0, 0.2);
}

.btn-add-small {
    background: rgba(76, 175, 80, 0.1);
    color: #4caf50;
}

.btn-add-small:hover {
    background: rgba(76, 175, 80, 0.2);
}

.btn-duplicate-piece {
    background: rgba(33, 150, 243, 0.1);
    color: #2196f3;
}

.btn-duplicate-piece:hover {
    background: rgba(33, 150, 243, 0.2);
}

.btn-remove-small,
.btn-remove-piece {
    background: rgba(244, 67, 54, 0.1);
    color: #f44336;
}

.btn-remove-small:hover,
.btn-remove-piece:hover {
    background: rgba(244, 67, 54, 0.2);
}

.pieces-list:empty {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 50px;
    color: var(--text-light);
    font-size: 0.75rem;
    font-style: italic;
}

.pieces-list:empty::after {
    content: "No pieces added yet";
}

.piece-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    background: white;
    transition: var(--transition);
    font-size: 0.75rem;
}

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

.piece-item:hover {
    background-color: var(--bg-color);
}

.piece-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

/* Piece Group Styling */
.piece-group {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 3px solid var(--primary-color);
}

.piece-group:hover {
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%);
}

.group-actions {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.remove-group {
    background: none;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    transition: var(--transition);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.remove-group:hover {
    background-color: rgba(231, 76, 60, 0.15);
    transform: scale(1.05);
}

.remove-group svg {
    width: 14px;
    height: 14px;
}

.piece-dimensions {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.75rem;
}

.piece-quantity {
    color: var(--text-light);
    font-size: 0.625rem;
}

.remove-piece {
    background: none;
    border: none;
    color: var(--accent-color);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius);
    transition: var(--transition);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.remove-piece svg {
    width: 12px;
    height: 12px;
}

.remove-piece:hover {
    background-color: rgba(231, 76, 60, 0.1);
}

.pieces-summary {
    background: var(--bg-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    color: var(--text-color);
}

/* Piece List */
.piece-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
}

.piece-list::-webkit-scrollbar {
    width: 4px;
}

.piece-list::-webkit-scrollbar-track {
    background: var(--bg-color);
}

.piece-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.piece-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    background: linear-gradient(135deg, var(--bg-color) 0%, #f1f3f4 100%);
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
    transition: var(--transition);
}

.piece-group-header:hover {
    background: linear-gradient(135deg, #f1f3f4 0%, #e8eaed 100%);
}

.piece-group-content {
    display: none;
}

.piece-group-content.active {
    display: block;
}

.piece-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
    transition: var(--transition);
}

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

.piece-item:hover {
    background-color: var(--bg-color);
}

.piece-item small {
    color: var(--text-light);
    font-size: 0.75rem;
}

/* Stats */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stat-card {
    background: linear-gradient(135deg, var(--card-bg) 0%, #f8f9fa 100%);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow-medium);
}

.stat-card h3 {
    font-size: 0.7rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.stat-card .value {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.1;
}

.stat-card:nth-child(1) .value {
    color: var(--primary-color);
}

.stat-card:nth-child(2) .value {
    color: var(--success-color);
}

.stat-card:nth-child(3) .value {
    color: var(--accent-color);
}

.stat-card:nth-child(4) .value {
    color: var(--secondary-color);
}

/* SVG Layouts */
.layouts-container {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.layout-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: 0 2px 4px var(--shadow-light);
    transition: var(--transition);
}

.layout-item:hover {
    box-shadow: 0 4px 8px var(--shadow-medium);
    transform: translateY(-1px);
}

.layout-title {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
}

.svg-container {
    width: 100%;
    margin: var(--spacing-sm) 0;
}

.svg-container svg {
    width: 100%;
    height: auto;
    max-height: 300px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

/* Results Panel */
.results-panel {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow-light);
    border: 1px solid var(--border-color);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.results-header h2 {
    margin: 0;
    font-size: 1.125rem;
}

.layout-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.results-summary {
    background: var(--bg-color);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
}

.results-summary.hidden {
    display: none;
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    color: var(--text-light);
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Legend */
.legend {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.legend-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    font-size: 0.75rem;
    transition: var(--transition);
}

.legend-item:hover {
    background-color: var(--bg-color);
}

.legend-color {
    width: 1rem;
    height: 1rem;
    margin-right: var(--spacing-xs);
    border: 1px solid #333;
    border-radius: 2px;
    flex-shrink: 0;
}

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    z-index: 1000;
}

.language-button {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 2px 8px var(--shadow-medium);
}

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

.language-button svg {
    width: 1.25rem;
    height: 1.25rem;
}

.language-menu {
    display: none;
    position: absolute;
    top: 3rem;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px var(--shadow-medium);
    min-width: 7rem;
    overflow: hidden;
}

.language-menu.active {
    display: block;
    animation: fadeIn 0.2s ease-out;
}

.language-menu button {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: none;
    text-align: left;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-color);
    transition: var(--transition);
}

.language-menu button:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

/* Alert */
.alert {
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
    color: #c62828;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    display: none;
    border: 1px solid #ef5350;
    position: relative;
    animation: slideIn 0.3s ease-out;
}

.alert::before {
    content: '';
    position: absolute;
    left: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background-color: #d32f2f;
    border-radius: 2px;
}

.alert.show {
    display: block;
}

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

/* Enhanced Layout Container for Web & Mobile */
.layout-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
    max-height: 70vh;
    overflow: auto;
    position: relative;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    background: var(--bg-color);
}

.layout-container::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.layout-container::-webkit-scrollbar-track {
    background: var(--bg-color);
    border-radius: 4px;
}

.layout-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.layout-container::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* Sheets Container */
.sheets-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-sm);
    transform-origin: top left;
    transition: transform 0.3s ease;
}

/* Sheet Layout Cards */
.sheet-layout {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: 0 4px 12px var(--shadow-medium);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.sheet-layout:hover {
    box-shadow: 0 8px 24px var(--shadow-medium);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.sheet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--bg-color);
}

.sheet-header h4 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 600;
}

.sheet-info {
    font-size: 0.8rem;
    color: var(--text-light);
    background: var(--bg-color);
    padding: 4px 8px;
    border-radius: 12px;
}

/* Sheet Container with SVG */
.sheet-container {
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius);
    overflow: hidden;
    background: white;
    border: 1px solid var(--border-color);
    position: relative;
}

.sheet-svg {
    width: 100%;
    height: auto;
    display: block;
    background: #fafafa;
    transition: transform 0.3s ease;
}

/* Sheet Stats */
.sheet-stats {
    display: flex;
    justify-content: space-between;
    background: linear-gradient(135deg, var(--bg-color), #f1f3f4);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
}

.sheet-stats .stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

.sheet-stats .label {
    font-size: 0.7rem;
    color: var(--text-light);
    font-weight: 500;
}

.sheet-stats .value {
    font-size: 0.75rem;
    color: var(--text-color);
    font-weight: 600;
}

/* Interactive Controls for Layout */
.layout-controls {
    position: sticky;
    top: 0;
    z-index: 100;
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px var(--shadow-light);
}

.layout-controls.hidden {
    display: none !important;
}

.control-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
}

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

.control-btn svg {
    width: 14px;
    height: 14px;
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .layout-container {
        max-height: 60vh;
        padding: var(--spacing-xs);
    }
    
    .sheets-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        padding: var(--spacing-xs);
    }
    
    .sheet-layout {
        padding: var(--spacing-sm);
    }
    
    .sheet-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .sheet-header h4 {
        font-size: 1rem;
    }
    
    .sheet-container {
        margin-bottom: var(--spacing-sm);
    }
    
    .sheet-svg {
        max-height: 250px;
        width: auto;
        margin: 0 auto;
    }
    
    .sheet-stats {
        flex-direction: column;
        gap: 4px;
    }
    
    .control-buttons {
        justify-content: space-around;
    }
    
    .control-btn {
        padding: 8px;
        font-size: 0.7rem;
    }
    
    /* Touch-friendly interactions */
    .sheet-layout {
        cursor: pointer;
        -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
    }
    
    /* Pinch-to-zoom support */
    .layout-container {
        touch-action: pan-x pan-y pinch-zoom;
    }
}

/* Tablet Optimizations */
@media (min-width: 769px) and (max-width: 1024px) {
    .sheets-container {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }
    
    .sheet-svg {
        max-height: 350px;
    }
}

/* Desktop Optimizations */
@media (min-width: 1025px) {
    .layout-container {
        max-height: 75vh;
    }
    
    .sheets-container {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }
    
    .sheet-svg {
        max-height: 450px;
    }
    
    /* Hover effects for desktop */
    .sheet-container:hover .sheet-svg {
        transform: scale(1.02);
    }
}

/* No results state */
.no-results {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-light);
    min-height: 200px;
}

.no-results svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.no-results p {
    font-size: 1rem;
    margin: 0;
}

/* Loading state */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s linear infinite;
}

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

/* Responsive Design */
@media (max-width: 767px) {
    .main-content {
        padding: var(--spacing-xs);
        gap: var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .btn-group {
        grid-template-columns: 1fr;
    }
    
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .layouts-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    h1 {
        font-size: 1.25rem;
        margin: var(--spacing-sm) 0;
    }
    
    .language-switcher {
        top: var(--spacing-xs);
        right: var(--spacing-xs);
    }
    
    .language-button {
        width: 2rem;
        height: 2rem;
    }
    
    .language-button svg {
        width: 1rem;
        height: 1rem;
    }
}

/* Print Styles */
@media print {
    .language-switcher,
    .sidebar,
    .btn-group,
    .accordion-header {
        display: none !important;
    }
    
    .main-content {
        display: block;
        max-width: none;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
        page-break-inside: avoid;
        margin-bottom: 1rem;
    }
    
    .layouts-container {
        display: block;
    }
    
    .layout-item {
        page-break-inside: avoid;
        margin-bottom: 2rem;
        box-shadow: none;
        border: 2px solid #000;
    }
    
    .svg-container svg {
        border: 1px solid #000;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
    }
    
    .stats {
        display: flex;
        justify-content: space-around;
        margin-bottom: 1rem;
    }
    
    .stat-card {
        border: 1px solid #000;
        margin: 0 0.5rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000;
        --text-color: #000;
        --bg-color: #fff;
    }
}

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

/* Enhanced Responsive Design */
@media (max-width: 767px) {
    .main-content {
        grid-template-columns: 1fr;
        padding: var(--spacing-xs);
        gap: var(--spacing-sm);
    }
    
    .control-panel, .results-panel {
        padding: var(--spacing-md);
    }
    
    .results-header {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }
    
    .layout-actions {
        justify-content: center;
    }
    
    .config-row {
        grid-template-columns: 1fr 1fr;
    }
    
    .input-row {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 0.8rem;
    }
    
    .language-selector {
        position: relative;
        top: auto;
        right: auto;
        margin: var(--spacing-sm) auto;
        justify-content: center;
    }
    
    .header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .main-content {
        grid-template-columns: 340px 1fr;
        gap: var(--spacing-md);
        width: 95%;
        max-width: none;
    }
}

@media (min-width: 1024px) {
    .main-content {
        grid-template-columns: 420px 1fr;
        gap: var(--spacing-xl);
        width: 95%;
        max-width: none;
    }
}

/* Print Styles */
@media print {
    .language-selector,
    .control-panel,
    .results-header,
    .btn,
    body > *:not(.results-panel) {
        display: none !important;
    }
    
    .results-panel {
        box-shadow: none;
        border: none;
        padding: 0;
        margin: 0;
    }
    
    .layout-item svg {
        max-height: none !important;
        width: 100%;
        height: auto;
        page-break-inside: avoid;
    }
    
    .layout-item {
        page-break-inside: avoid;
        margin-bottom: 1cm;
    }
}

/* Utilities */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center {
    text-align: center;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }