/* Modern Resistor Colour Code Calculator Styles - Clean Version */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables for consistent theming */
:root {
    --primary-color: #5b65ea;
    --secondary-color: #6c757d;
    --accent-color: #17a2b8;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    
    --border-color: #dee2e6;
    --border-radius: 8px;
    --border-radius-sm: 6px;
    --border-radius-lg: 12px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.entry-header {display: none;}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #ffffff;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-primary);
}

/* Main Container - Clean Card Design */
.main-container {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 40px;
    max-width: 1200px;
    width: 100%;
    border: 1px solid var(--border-color);
}

/* Main Title - Simple Gradient */
.main-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 35px;
    color: var(--primary-color);
    letter-spacing: -0.5px;
}

/* Tab Design - Clean Style */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 35px;
    justify-content: center;
    background: var(--bg-secondary);
    padding: 4px;
    border-radius: var(--border-radius);
}

.tab-btn {
    flex: 1;
    max-width: 250px;
    padding: 12px 24px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.tab-btn.active {
    background: var(--bg-primary);
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover:not(.active) {
    color: var(--text-primary);
}

.tab-content {
    display: none;
}

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

/* Band Selector - Clean Button Design */
.band-selector-container {
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.band-selector-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.band-selector {
    display: flex;
    gap: 10px;
}

.band-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 65px;
    height: 65px;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.band-btn:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.band-btn.active .band-label,
.band-btn.active .band-value {
    color: white;
}

.band-label {
    font-size: 10px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.band-value {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1;
}

/* Reset Button - Simple Style */
.reset-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.reset-btn:hover {
    background: #c82333;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Calculator Layout */
.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 30px;
}

/* Resistor Container - Light Background */
.resistor-container {
    background: var(--bg-secondary);
    padding: 30px;
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
}

/* Result Display - Clean Card */
.result-display {
    background: var(--bg-primary);
    padding: 25px;
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--border-color);
}

.result-value-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.result-value {
    font-size: 32px;
    font-weight: 600;
    color: var(--primary-color);
}

/* Copy Button - Simple Design */
.copy-btn {
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.copy-btn:hover svg {
    stroke: white;
}

.result-details {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 15px;
    line-height: 1.5;
}

/* Tolerance Range - Simple Badge */
.tolerance-range {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
}

.range-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 13px;
}

.range-min, .range-max {
    font-weight: 600;
    color: var(--success-color);
    font-size: 14px;
}

.range-separator {
    color: var(--text-muted);
}

/* Share Link Button - Primary Style */
.share-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.share-link-btn:hover {
    background: #4c56d2;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Unit Selector - Toggle Style */
.unit-selector {
    display: inline-flex;
    gap: 0;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

.unit-btn {
    padding: 8px 14px;
    background: var(--bg-primary);
    border: none;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-right: 1px solid var(--border-color);
}

.unit-btn:last-child {
    border-right: none;
}

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

.unit-btn:hover:not(.active) {
    background: var(--bg-secondary);
}

/* Result Conversions - Grid Cards */
.result-conversions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 15px;
}

.conversion-item {
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    text-align: center;
    border: 1px solid var(--border-color);
}

.conversion-label {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.conversion-value {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Band Controls - Clean Cards */
.band-control {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
}

.band-header {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.band-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 13px;
    font-weight: 600;
}

/* Color Grid - Color Buttons */
.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 8px;
}

.color-btn {
    min-height: 60px;
    padding: 8px;
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    font-size: 12px;
    font-weight: 500;
    text-align: center;
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
    white-space: pre-line;
    line-height: 1.2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.color-btn.selected {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(91, 101, 234, 0.2);
    transform: scale(1.05);
}

.color-btn:hover:not(.selected) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 0, 0, 0.2);
}

/* Value to Color Tab Styles */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-field {
    width: 100%;
    padding: 12px 15px;
    font-size: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-normal);
    background: var(--bg-primary);
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(91, 101, 234, 0.1);
}

.input-field::placeholder {
    color: var(--text-muted);
}

/* Common Values - Quick Select */
.common-values-section {
    margin-bottom: 20px;
}

.common-values-grid {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.common-value-btn {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

/* Value Layout */
.value-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

/* Tolerance Grid */
.tolerance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 10px;
}

.tolerance-btn {
    padding: 12px 8px;
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    font-size: 12px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    line-height: 1.3;
}

.tolerance-btn.selected {
    border-color: var(--text-primary) !important;
    box-shadow: 0 0 0 3px rgba(91, 101, 234, 0.2);
}

.tolerance-btn:hover:not(.selected) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
    border-color: rgba(0, 0, 0, 0.2);
}

/* Advanced Toggle */
.advanced-toggle-container {
    margin-top: 20px;
}

.advanced-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
}

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

.advanced-section {
    margin-top: 20px;
}

/* Calculation Display */
.calculation-display {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-top: 20px;
    border: 1px solid var(--border-color);
}

.calc-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.calc-row:last-child {
    border-bottom: none;
}

.calc-label {
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.calc-value {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

/* Color Display */
.color-display {
    display: flex;
    gap: 12px;
    margin-top: 25px;
    justify-content: center;
    flex-wrap: wrap;
}

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

.color-box-inner {
    width: 80px;
    height: 65px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 13px;
    border-radius: var(--border-radius-sm);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.color-box-label {
    margin-top: 8px;
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.color-box-name {
    font-size: 12px;
    color: var(--text-primary);
    font-weight: 500;
    margin-top: 2px;
}

/* Responsive Design */
@media (min-width: 1200px) {
    .main-container {
        width: 1200px;
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .calculator-layout {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    
    .value-layout {
        grid-template-columns: 1fr;
        gap: 25px;
    }
}

@media (max-width: 768px) {
    .main-container {
        padding: 25px 20px;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        max-width: 100%;
    }
    
    .band-selector-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .band-selector {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .result-value {
        font-size: 26px;
    }
    
    .common-values-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }
    
    .result-conversions {
        grid-template-columns: 1fr;
    }
    
    .color-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .tolerance-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .main-container {
        padding: 20px 15px;
    }
    
    .main-title {
        font-size: 1.5rem;
    }
    
    .band-btn {
        width: 55px;
        height: 55px;
    }
    
    .band-value {
        font-size: 20px;
    }
    
    .result-value {
        font-size: 22px;
    }
    
    .color-display {
        gap: 8px;
    }
    
    .color-box-inner {
        width: 65px;
        height: 55px;
        font-size: 11px;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }
    
    .main-container {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .reset-btn,
    .share-link-btn,
    .copy-btn {
        display: none;
    }
}

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        *:focus {
            outline: 3px solid #667eea !important;
            outline-offset: 2px !important;
        }
        
        button:focus-visible {
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.5);
        }
        
        .skip-to-content {
            position: absolute;
            left: -9999px;
            z-index: 999;
            padding: 1em;
            background: #667eea;
            color: white;
            text-decoration: none;
            border-radius: 4px;
        }
        
        .skip-to-content:focus {
            left: 50%;
            transform: translateX(-50%);
            top: 10px;
        }