/* 
 * MODERN PROFESSIONAL LAB COLOR CALCULATOR
 * Multi-generational appeal: Gen X, Millennials, Gen Z
 * Professional yet modern with subtle premium touches
 */

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

/* Modern Professional Color Variables */
:root {
    /* Primary Colors - Modern Professional */
    --primary-bg: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --secondary-bg: #ffffff;
    --card-bg: rgba(255, 255, 255, 0.9);
    --accent-bg: rgba(248, 249, 250, 0.8);
    
    /* Borders and Lines */
    --border-color: rgba(0, 0, 0, 0.1);
    --border-light: rgba(0, 0, 0, 0.05);
    --border-accent: rgba(23, 162, 184, 0.3);
    
    /* Text Colors */
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --text-muted: #8ba2b5;
    --text-white: #ffffff;
    
    /* Modern Accent Colors */
    --accent-primary: #3498db;
    --accent-secondary: #2ecc71;
    --accent-warning: #f39c12;
    --accent-danger: #e74c3c;
    --accent-purple: #9b59b6;
    --accent-teal: #1abc9c;
    
    /* CMYK Inspired Colors */
    --cyan-primary: #00bcd4;
    --magenta-primary: #e91e63;
    --yellow-primary: #ffc107;
    --black-primary: #37474f;
    
    /* Interactive States */
    --hover-bg: rgba(52, 152, 219, 0.1);
    --active-bg: rgba(52, 152, 219, 0.2);
    --focus-shadow: 0 0 0 3px rgba(52, 152, 219, 0.3);
    
    /* Modern Shadows */
    --shadow-soft: 0 2px 20px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-strong: 0 15px 50px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(52, 152, 219, 0.2);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    /* Modern Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
}

/* Dark Mode Variables */
:root[data-theme="dark"] {
    /* Primary Colors - Elegant Dark Mode */
    --primary-bg: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 100%);
    --secondary-bg: rgba(15, 15, 35, 0.95);
    --card-bg: rgba(26, 26, 46, 0.9);
    --accent-bg: rgba(20, 20, 40, 0.8);
    
    /* Borders and Lines - Subtle */
    --border-color: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.04);
    --border-accent: rgba(100, 149, 237, 0.3);
    
    /* Text Colors - High Contrast */
    --text-primary: #e8eaed;
    --text-secondary: #bdc1c6;
    --text-muted: #9aa0a6;
    --text-white: #ffffff;
    
    /* Modern Accent Colors - Vibrant but Elegant */
    --accent-primary: #6495ed;
    --accent-secondary: #20c997;
    --accent-warning: #ffc107;
    --accent-danger: #dc3545;
    --accent-purple: #9b59b6;
    --accent-teal: #17a2b8;
    
    /* CMYK Inspired Colors - Dark mode variants */
    --cyan-primary: #06b6d4;
    --magenta-primary: #ec4899;
    --yellow-primary: #eab308;
    --black-primary: #1f2937;
    
    /* Interactive States - Smooth */
    --hover-bg: rgba(100, 149, 237, 0.1);
    --active-bg: rgba(100, 149, 237, 0.2);
    --focus-shadow: 0 0 0 3px rgba(100, 149, 237, 0.3);
    
    /* Modern Shadows - Enhanced for Dark */
    --shadow-soft: 0 2px 20px rgba(0, 0, 0, 0.4);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-strong: 0 15px 50px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(100, 149, 237, 0.3);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    /* Modern Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
}

/* Base Typography */
body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--primary-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* FIXED: Subtle Modern Status Bar */
.status-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateY(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

.status-bar.visible {
    transform: translateY(0);
}

.status-bar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 1200px;
    padding: 0 var(--spacing-lg);
    gap: var(--spacing-lg);
}

.status-info,
.delta-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.status-label,
.delta-label {
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.75rem;
}

.status-value,
.delta-value {
    background: var(--accent-primary);
    color: var(--text-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.75rem;
    min-width: 50px;
    text-align: center;
}

.quick-actions-bar {
    display: flex;
    gap: var(--spacing-sm);
}

.status-action-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-action-btn:hover {
    background: var(--hover-bg);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Container Layout with Modern Spacing */
.calculator-container {
    max-width: 1200px;
    margin: var(--spacing-xl) auto;
    padding: var(--spacing-xxl);
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    margin-top: 60px; /* Account for status bar */
}

/* Modern Header Design */
.app-header {
    margin-bottom: var(--spacing-xxl);
    padding-bottom: var(--spacing-xl);
    position: relative;
}

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

.header-text {
    text-align: center;
    flex: 1;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.app-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--cyan-primary), var(--magenta-primary), var(--yellow-primary));
    border-radius: var(--radius-sm);
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.app-header .subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    font-weight: 400;
    opacity: 0.8;
}

/* Theme Toggle Button */
.theme-toggle {
    width: 48px;
    height: 48px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--card-bg);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-light);
}

.theme-toggle:hover {
    background: var(--hover-bg);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.theme-toggle:active {
    transform: translateY(0);
}

.theme-icon {
    transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-icon {
    transform: rotate(20deg);
}

/* Install App Button */
.install-button {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--accent-secondary);
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.install-button:hover {
    background: #27ae60;
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

/* Horizontal Equation Layout */
.calculator-main {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.calculator-main .color-section {
    flex: 0 0 300px;
    min-height: 400px;
}

.equation-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    width: 100%;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

/* Modern Color Sections */
.color-section {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.color-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--cyan-primary), var(--magenta-primary));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.color-section:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
    border-color: var(--border-accent);
}

.color-section h2 {
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    letter-spacing: -0.01em;
}

/* FIXED: Beautiful Color Swatches */
.color-display {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    gap: var(--spacing-lg);
}

.color-swatch {
    width: 100px;
    height: 100px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #ffffff;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: all 0.3s ease;
    cursor: pointer;
}

.color-swatch::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, #f0f0f0 25%, transparent 25%), 
        linear-gradient(-45deg, #f0f0f0 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #f0f0f0 75%), 
        linear-gradient(-45deg, transparent 75%, #f0f0f0 75%);
    background-size: 10px 10px;
    background-position: 0 0, 0 5px, 5px -5px, -5px 0px;
    opacity: 0.3;
}

.color-swatch:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: var(--shadow-glow);
    border-color: var(--accent-primary);
}

/* Real-time color update animation */
.color-swatch.color-updated {
    animation: colorSwatchUpdate 0.5s ease-out;
    border-color: var(--accent-secondary);
    box-shadow: 0 0 15px rgba(46, 204, 113, 0.4);
}

@keyframes colorSwatchUpdate {
    0% {
        transform: scale(1);
        box-shadow: var(--shadow-soft);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 20px rgba(46, 204, 113, 0.6);
    }
    100% {
        transform: scale(1);
        box-shadow: var(--shadow-soft);
    }
}

/* Enhanced color swatch transitions */
.color-swatch {
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* Loading state for color swatches */
.color-swatch.loading {
    position: relative;
    opacity: 0.7;
}

.color-swatch.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 30px;
    height: 30px;
    margin: -15px 0 0 -15px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: swatchSpinner 1s linear infinite;
}

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

/* Color equation symbols */
.color-equation-symbol {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-secondary);
    user-select: none;
    opacity: 0.6;
    transition: all 0.2s ease;
}

.color-equation-symbol:hover {
    opacity: 1;
    color: var(--accent-primary);
}

/* Modern Input Groups */
.input-groups {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-group {
    background: var(--accent-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-light);
    transition: all 0.2s ease;
}

.input-group:hover {
    background: rgba(248, 249, 250, 1);
    border-color: var(--border-accent);
}

.group-label {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.input-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(85px, 1fr));
    gap: var(--spacing-md);
}

.input-field {
    display: flex;
    flex-direction: column;
    position: relative;
}

.input-field label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
}

.input-field input {
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-mono);
    font-weight: 600;
    text-align: center;
    background: var(--secondary-bg);
    transition: all 0.2s ease;
    color: var(--text-primary);
}

.input-field input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: var(--focus-shadow);
    transform: scale(1.02);
}

.input-field input:hover {
    border-color: var(--accent-primary);
}

/* Modern Preset Controls */
.preset-controls {
    display: flex;
    justify-content: space-between;
    align-items: end;
    margin-bottom: var(--spacing-lg);
    gap: var(--spacing-lg);
}

.preset-dropdown-container {
    flex: 1;
}

.preset-dropdown-container label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.preset-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--secondary-bg);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
}

.preset-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: var(--focus-shadow);
}

/* Modern Quick Actions */
.quick-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.quick-action-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--secondary-bg);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.quick-action-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: var(--text-white);
    transform: translateY(-1px);
}

/* Modern Delta Section */
.delta-section {
    grid-column: 1 / -1;
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.delta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--yellow-primary), var(--black-primary));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.delta-indicator {
    width: 80px;
    height: 80px;
    border: 3px solid var(--accent-primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    position: relative;
    overflow: hidden;
}

.delta-symbol {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Modern Delta Values */
.delta-values {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.delta-item {
    background: var(--accent-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: all 0.2s ease;
}

.delta-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.delta-item label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.delta-item span {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Modern Calculate Section */
.calculate-section {
    text-align: center;
    margin: var(--spacing-xxl) 0;
}

.calculate-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
}

.calculate-button {
    padding: var(--spacing-lg) var(--spacing-xxl);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--shadow-medium);
    position: relative;
    overflow: hidden;
}

.calculate-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.calculate-button:hover::before {
    left: 100%;
}

.calculate-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

.calculate-button:active {
    transform: translateY(0);
}

#reset-all-btn {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#reset-all-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* Modern Results Section */
.results-section {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xxl);
    margin-top: var(--spacing-xl);
    display: none;
    position: relative;
    overflow: hidden;
}

.results-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--cyan-primary), var(--magenta-primary), var(--yellow-primary), var(--black-primary));
}

.results-section.visible {
    display: block;
    animation: slideInUp 0.5s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.total-delta-e {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.total-delta-e h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.01em;
}

.delta-e-value {
    background: linear-gradient(135deg, var(--accent-bg), rgba(248, 249, 250, 1));
    border-radius: var(--radius-xl);
    padding: var(--spacing-xxl);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

.delta-e-number {
    font-family: var(--font-mono);
    font-size: 4rem;
    font-weight: 800;
    color: var(--text-primary);
    display: block;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.delta-e-label {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
}

/* Modern Tolerance Indicators */
.tolerance-zone {
    margin-top: var(--spacing-lg);
}

.tolerance-indicator {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: var(--shadow-soft);
    transition: all 0.2s ease;
}

.tolerance-indicator:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

.tolerance-indicator.good {
    background: linear-gradient(135deg, var(--accent-secondary), #27ae60);
    color: var(--text-white);
}

.tolerance-indicator.acceptable {
    background: linear-gradient(135deg, var(--accent-warning), #e67e22);
    color: var(--text-white);
}

.tolerance-indicator.poor {
    background: linear-gradient(135deg, var(--accent-danger), #c0392b);
    color: var(--text-white);
}

/* Modern Tools Section */
.tools-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xxl);
}

.history-panel,
.export-panel,
.testing-panel {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all 0.2s ease;
}

.history-panel:hover,
.export-panel:hover,
.testing-panel:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.history-panel h3,
.export-panel h3,
.testing-panel h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.01em;
}

/* Modern Export Buttons */
.export-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.export-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    color: var(--accent-primary);
    border: 2px solid var(--accent-primary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.export-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--accent-primary);
    transition: left 0.3s ease;
    z-index: -1;
}

.export-btn:hover::before {
    left: 0;
}

.export-btn:hover {
    color: var(--text-white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

/* Modern History List */
.history-list {
    max-height: 250px;
    overflow-y: auto;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    background: var(--accent-bg);
}

.history-item {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-mono);
    font-size: 0.875rem;
}

.history-item:hover {
    background: var(--hover-bg);
    transform: translateX(5px);
}

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

.clear-history-btn {
    width: 100%;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.clear-history-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* Suggestions Container */
.suggestions-container {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.suggestions-container h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.suggestions-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.suggestion-item {
    background: var(--accent-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    border: 1px solid var(--border-light);
    transition: all 0.2s ease;
}

.suggestion-item:hover {
    background: var(--hover-bg);
    transform: translateX(5px);
}

/* G7 Analysis Section */
.g7-analysis-container {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.g7-analysis-container h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

/* Modern Responsive Design */
@media (max-width: 768px) {
    .calculator-container {
        padding: var(--spacing-lg);
        margin: var(--spacing-sm);
    }
    
    .equation-container {
        flex-direction: column;
        align-items: center;
    }
    
    .calculator-main .color-section {
        flex: 1;
        max-width: 100%;
    }
    
    .color-equation-symbol {
        font-size: 2rem !important;
        transform: rotate(90deg);
        margin: var(--spacing-md) 0;
    }
    
    .input-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .preset-controls {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }
    
    .quick-actions {
        justify-content: center;
    }
    
    .calculate-controls {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .tools-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .export-buttons {
        flex-direction: column;
    }
    
    .status-bar-content {
        flex-direction: column;
        height: auto;
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .status-bar {
        height: auto;
        min-height: 50px;
    }
}

@media (max-width: 480px) {
    .color-swatch {
        width: 120px;
        height: 120px;
    }
    
    .delta-e-number {
        font-size: 2.5rem;
    }
    
    .app-header h1 {
        font-size: 2rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .header-controls {
        justify-content: center;
    }
    
    .calculator-container {
        margin-top: 80px;
    }
}

/* Professional Tooltips System */
.tooltip-container {
    position: relative;
    display: inline-block;
}

.tooltip-trigger {
    cursor: help;
    position: relative;
}

.tooltip-content {
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: var(--text-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.4;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0.0, 0.2, 1);
    z-index: 1000;
    box-shadow: var(--shadow-medium);
    max-width: 300px;
    white-space: normal;
}

.tooltip-content::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--text-primary);
}

.tooltip-trigger:hover .tooltip-content,
.tooltip-trigger:focus .tooltip-content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-4px);
}

/* Professional inline help system */
.inline-help {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-left: var(--spacing-xs);
}

.help-icon {
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--accent-primary);
    color: var(--text-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: help;
    transition: all 0.2s ease;
    position: relative;
}

.help-icon:hover {
    background: var(--accent-purple);
    transform: scale(1.1);
    box-shadow: var(--shadow-soft);
}

.help-icon::before {
    content: '?';
}

/* Enhanced tooltips for printing professionals */
.printing-tooltip {
    background: linear-gradient(135deg, var(--text-primary), var(--black-primary));
    padding: var(--spacing-lg);
    max-width: 350px;
    border: 1px solid var(--border-light);
}

.printing-tooltip .tooltip-title {
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
}

.printing-tooltip .tooltip-description {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-sm);
    line-height: 1.5;
}

.printing-tooltip .tooltip-tip {
    font-size: 0.8rem;
    color: var(--cyan-primary);
    font-style: italic;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

/* Context-sensitive help panels */
.help-panel {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-md);
    display: none;
    position: relative;
    overflow: hidden;
}

.help-panel.visible {
    display: block;
    animation: slideInUp 0.3s ease-out;
}

.help-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-teal));
}

.help-panel h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.help-panel h4::before {
    content: '💡';
    font-size: 1.1rem;
}

.help-panel p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.help-panel .help-example {
    background: var(--accent-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--accent-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    margin: var(--spacing-md) 0;
}

.help-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

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

.help-toggle.active {
    background: var(--accent-primary);
    color: var(--text-white);
    border-color: var(--accent-primary);
}

/* Focus indicators for accessibility */
button:focus,
input:focus,
select:focus {
    outline: none;
    box-shadow: var(--focus-shadow);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
        --accent-bg: #ffffff;
    }
}

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

/* Hide premium elements until implemented */
.premium-feature,
.premium-badge {
    display: none;
}

/* Workflow Container - Step-by-step calculation process */
.workflow-container {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin: var(--spacing-lg) 0;
    display: none;
    position: relative;
    overflow: hidden;
}

.workflow-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--cyan-primary), var(--magenta-primary), var(--yellow-primary));
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.workflow-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
}

.workflow-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.workflow-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.workflow-close:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.workflow-steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.workflow-step {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    position: relative;
}

.workflow-step.pending {
    background: var(--accent-bg);
    opacity: 0.6;
}

.workflow-step.processing {
    background: rgba(52, 152, 219, 0.1);
    border-left: 3px solid var(--accent-primary);
    animation: pulse 2s infinite;
}

.workflow-step.completed {
    background: rgba(46, 204, 113, 0.1);
    border-left: 3px solid var(--accent-secondary);
}

.workflow-step.error {
    background: rgba(231, 76, 60, 0.1);
    border-left: 3px solid var(--accent-danger);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    position: relative;
    flex-shrink: 0;
}

.workflow-step.processing .step-indicator {
    border-color: var(--accent-primary);
    background: rgba(52, 152, 219, 0.1);
}

.workflow-step.completed .step-indicator {
    border-color: var(--accent-secondary);
    background: var(--accent-secondary);
}

.workflow-step.error .step-indicator {
    border-color: var(--accent-danger);
    background: rgba(231, 76, 60, 0.1);
}

.step-number {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.workflow-step.completed .step-number {
    display: none;
}

.step-checkmark {
    font-size: 1.25rem;
    color: var(--text-white);
    font-weight: 700;
}

.step-spinner {
    font-size: 1.25rem;
    color: var(--accent-primary);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.step-content {
    flex: 1;
    min-width: 0;
}

.step-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.step-details {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    line-height: 1.4;
    white-space: pre-wrap;
}

/* Workflow Toggle Button */
.workflow-toggle-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    color: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.workflow-toggle-btn:hover {
    background: var(--accent-primary);
    color: var(--text-white);
}

.workflow-toggle-btn.active {
    background: var(--accent-primary);
    color: var(--text-white);
}

/* Ensure monospace for values */
.value,
.important-value {
    font-family: var(--font-mono);
    font-weight: 600;
}

/* Loading states */
.calculating {
    opacity: 0.7;
    pointer-events: none;
}

.calculating .calculate-button {
    background: var(--text-muted);
    cursor: not-allowed;
}

/* Success states */
.success-flash {
    animation: successFlash 0.5s ease-out;
}

@keyframes successFlash {
    0% { background-color: transparent; }
    50% { background-color: rgba(46, 204, 113, 0.2); }
    100% { background-color: transparent; }
}
/*
 Enhanced Tooltip System */
.tooltip-enhanced {
    position: relative;
    cursor: help;
}

.tooltip-enhanced:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #1a252f 0%, #2c3e50 100%);
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 0.9rem;
    white-space: pre-line;
    z-index: 1001;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
    margin-bottom: 8px;
    max-width: 320px;
    text-align: left;
    line-height: 1.4;
    font-weight: 400;
    animation: tooltipFadeIn 0.3s ease-out;
}

.tooltip-enhanced:hover::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: #1a252f;
    z-index: 1001;
    margin-bottom: 2px;
    animation: tooltipFadeIn 0.3s ease-out;
}

@keyframes tooltipFadeIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Tooltip positioning variants */
.tooltip-enhanced.tooltip-left:hover::after {
    left: 0;
    transform: translateX(0);
}

.tooltip-enhanced.tooltip-left:hover::before {
    left: 20px;
    transform: translateX(0);
}

.tooltip-enhanced.tooltip-right:hover::after {
    right: 0;
    left: auto;
    transform: translateX(0);
}

.tooltip-enhanced.tooltip-right:hover::before {
    right: 20px;
    left: auto;
    transform: translateX(0);
}

.tooltip-enhanced.tooltip-bottom:hover::after {
    top: 100%;
    bottom: auto;
    margin-top: 8px;
    margin-bottom: 0;
}

.tooltip-enhanced.tooltip-bottom:hover::before {
    top: 100%;
    bottom: auto;
    border-top-color: transparent;
    border-bottom-color: #1a252f;
    margin-top: 2px;
    margin-bottom: 0;
}

/* Mobile tooltip adjustments */
@media (max-width: 768px) {
    .tooltip-enhanced:hover::after {
        max-width: 280px;
        font-size: 0.85rem;
        padding: 10px 14px;
    }
    
    .tooltip-enhanced:hover::before {
        border-width: 5px;
    }
}

/* Disable tooltips on touch devices to prevent issues */
@media (hover: none) and (pointer: coarse) {
    .tooltip-enhanced:hover::after,
    .tooltip-enhanced:hover::before {
        display: none;
    }
    
    /* Add tap-to-show functionality for mobile */
    .tooltip-enhanced.tooltip-active::after {
        display: block;
    }
    
    .tooltip-enhanced.tooltip-active::before {
        display: block;
    }
}

/* Gold accent enhancements */
.tooltip-enhanced.gold-accent {
    color: #d4af37;
}

.tooltip-enhanced.gold-accent:hover::after {
    background: linear-gradient(135deg, #d4af37 0%, #b8941f 100%);
    color: white;
}

.tooltip-enhanced.gold-accent:hover::before {
    border-top-color: #d4af37;
}

/* Accessibility improvements */
.tooltip-enhanced:focus::after,
.tooltip-enhanced:focus::before {
    display: block;
}

.tooltip-enhanced[aria-describedby] {
    outline: 2px solid #007bff;
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .tooltip-enhanced:hover::after {
        background: #000000;
        border: 2px solid #ffffff;
    }
    
    .tooltip-enhanced:hover::before {
        border-top-color: #000000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .tooltip-enhanced:hover::after,
    .tooltip-enhanced:hover::before {
        animation: none;
    }
}/* Gold A
ccent System */
:root {
    --gold-primary: #d4af37;
    --gold-light: #f4e4a6;
    --gold-dark: #b8941f;
    --gold-gradient: linear-gradient(135deg, #d4af37 0%, #f4e4a6 50%, #d4af37 100%);
}

/* Gold accent text */
.gold-accent {
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 600;
}

/* Gold accent for important values */
.important-value .value {
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

/* Gold border accents */
.gold-border {
    border-color: var(--gold-primary) !important;
}

/* Gold shadow effects */
.gold-shadow {
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.2);
}

/* Gold button variants */
.btn-gold {
    background: transparent;
    border: 2px solid var(--gold-primary);
    color: var(--gold-primary);
    transition: all 0.3s ease;
}

.btn-gold:hover {
    background: var(--gold-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3);
}

/* Enhanced button outlines */
.calculate-button,
.reset-button,
.export-btn,
.quick-action-btn {
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.calculate-button {
    border-color: #007bff;
}

.calculate-button:hover {
    border-color: var(--gold-primary);
    box-shadow: 0 0 0 2px rgba(212, 175, 55, 0.3);
}

.reset-button {
    border-color: #dc3545;
}

.export-btn,
.quick-action-btn {
    border-color: #6c757d;
}

.export-btn:hover,
.quick-action-btn:hover {
    border-color: var(--gold-primary);
    color: var(--gold-primary);
}

/* Gold accents for excellent results */
.delta-e-value.excellent {
    background: linear-gradient(135deg, #f4e4a6 0%, #fff9e6 100%);
    border: 2px solid var(--gold-primary);
}

.delta-e-value.excellent .delta-e-number {
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tolerance-zone.excellent {
    background: var(--gold-gradient);
    color: white;
    border: 1px solid var(--gold-dark);
}

/* Gold accents for section headers */
.color-section h2,
.delta-section h2 {
    position: relative;
}

.color-section h2::after,
.delta-section h2::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: var(--gold-gradient);
    border-radius: 1px;
}

/* Premium status indicators */
.status-value.complete {
    color: var(--gold-primary);
    font-weight: 600;
}

.delta-value.excellent {
    color: var(--gold-primary);
    font-weight: 700;
}

/* Responsive gold accents */
@media (max-width: 768px) {
    .gold-accent,
    .important-value .value {
        /* Fallback for mobile devices that might not support background-clip */
        color: var(--gold-primary);
    }
}

/* High contrast mode adjustments */
@media (prefers-contrast: high) {
    .gold-accent,
    .important-value .value {
        color: #000000;
        background: none;
        -webkit-text-fill-color: #000000;
    }
    
    .btn-gold {
        border-color: #000000;
        color: #000000;
    }
}