/* Technical Converters Page - Professional UX Optimized Styling */
/* Enhanced user experience with consistent blue design theme and professional typography */

:root {
    --primary-blue: #007AFF;
    --secondary-blue: #5AC8FA;
    --accent-blue: #0056CC;
    --light-blue: #E3F2FD;
    --dark-blue: #1565C0;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --background-white: #ffffff;
    --border-color: #e2e8f0;
    --gray-50: #f8fafc;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition-fast: 0.2s ease;
    
    /* Enhanced UX Variables - Technical Theme */
    --icon-primary: #007AFF;
    --icon-contrast: #ffffff;
    --title-primary: #1d1d1f;
    --title-secondary: #334155;
    --accent-gradient: linear-gradient(135deg, #007AFF 0%, #0056CC 100%);
    --shadow-subtle: 0 2px 8px rgba(0, 122, 255, 0.08);
    --shadow-elevated: 0 8px 25px rgba(0, 122, 255, 0.15);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    line-height: 1.6;
    color: var(--text-primary);
    font-weight: 400;
    letter-spacing: -0.01em;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 32px;
}

/* Professional Category Header */
.category-page {
    max-width: none;
}

.category-header {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 24px;
    padding: 56px 48px;
    margin-bottom: 72px;
    box-shadow: var(--shadow-elevated);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 48px;
}

.category-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.category-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.category-icon i {
    color: var(--icon-contrast);
    background: var(--accent-gradient);
    width: 96px;
    height: 96px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    box-shadow: var(--shadow-elevated);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.category-info {
    flex: 1;
}

.category-header h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin: 0 0 20px 0;
    color: var(--title-primary);
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #1d1d1f 0%, #374151 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-description {
    font-size: 1.125rem;
    margin: 0 0 28px 0;
    line-height: 1.7;
    color: var(--text-secondary);
    font-weight: 400;
    max-width: 600px;
}

.category-stats {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #f0f9ff 0%, #dbeafe 100%);
    border: 1px solid #3b82f6;
    border-radius: 12px;
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #1e40af;
    box-shadow: var(--shadow-subtle);
    transition: all var(--transition-fast);
}

.stat-badge:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-elevated);
}

.stat-badge i {
    color: var(--primary-blue);
    font-size: 0.9rem;
}

/* Enhanced Calculator Grid */
.calculators-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-bottom: 96px;
}

.calculator-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    padding: 28px;
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-subtle);
    position: relative;
    overflow: hidden;
}

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
}

.calculator-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-elevated);
    border-color: var(--primary-blue);
    text-decoration: none;
    background: linear-gradient(135deg, #fafbfc 0%, #f1f5f9 100%);
}

.calculator-card.featured::before {
    height: 4px;
}

.calculator-card.featured {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-elevated);
}

.calculators-grid .calculator-card .calculator-icon {
    margin-bottom: 20px;
    display: flex;
    justify-content: flex-start;
}

.calculators-grid .calculator-card .calculator-icon i {
    color: var(--icon-contrast) !important;
    background: var(--accent-gradient) !important;
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-elevated);
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

/* Override any icon color classes from icons.css */
.calculators-grid .calculator-card .calculator-icon i.fas {
    color: white !important;
    background: linear-gradient(135deg, #007AFF 0%, #0056CC 100%) !important;
}

.calculators-grid .calculator-card .calculator-icon i.icon {
    color: white !important;
    background: linear-gradient(135deg, #007AFF 0%, #0056CC 100%) !important;
}

.calculators-grid .calculator-card .calculator-icon i.icon-2xl {
    color: white !important;
    background: linear-gradient(135deg, #007AFF 0%, #0056CC 100%) !important;
}

.calculators-grid .calculator-card:hover .calculator-icon i {
    transform: scale(1.05);
    box-shadow: 0 12px 30px rgba(0, 122, 255, 0.3);
}

.calculators-grid .calculator-card .calculator-content {
    flex: 1;
    margin-bottom: 20px;
}

.calculators-grid .calculator-card .calculator-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--title-primary);
    margin: 0 0 12px 0;
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.calculators-grid .calculator-card .calculator-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0 0 20px 0;
    font-weight: 400;
}

.calculators-grid .calculator-card .calculator-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.calculators-grid .calculator-card .calculator-features .feature-tag {
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    color: var(--text-secondary);
    border: 1px solid #cbd5e1;
    transition: all var(--transition-fast);
}

.calculators-grid .calculator-card .calculator-features .feature-tag:hover {
    background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 100%);
    color: var(--text-primary);
}

.calculators-grid .calculator-card .calculator-status {
    margin-top: auto;
}

.calculators-grid .calculator-card .calculator-status .status-badge {
    padding: 8px 16px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.calculators-grid .calculator-card .calculator-status .status-badge.available {
    background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
    color: #15803d;
    border: 1px solid #22c55e;
    box-shadow: var(--shadow-subtle);
}

.calculators-grid .calculator-card .calculator-status .status-badge.coming-soon {
    background: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
    color: #92400e;
    border: 1px solid #f59e0b;
    box-shadow: var(--shadow-subtle);
}

/* Precision Standards Section */
.precision-standards {
    margin-bottom: 96px;
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 24px;
    padding: 56px 48px;
    box-shadow: var(--shadow-elevated);
    position: relative;
    overflow: hidden;
}

.precision-standards::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.standards-header {
    text-align: center;
    margin-bottom: 48px;
}

.standards-header .section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--title-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin: 0 0 16px 0;
    letter-spacing: -0.01em;
}

.standards-header .section-title i {
    color: var(--icon-contrast);
    background: var(--accent-gradient);
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-elevated);
}

.standards-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

.standards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.standard-item {
    text-align: center;
    padding: 32px 24px;
    background: linear-gradient(135deg, #fafbfc 0%, #f1f5f9 100%);
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-subtle);
}

.standard-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-elevated);
    border-color: var(--primary-blue);
}

.standard-item i {
    color: var(--icon-contrast);
    background: var(--accent-gradient);
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    box-shadow: var(--shadow-elevated);
    margin: 0 auto 20px;
    transition: all 0.3s ease;
}

.standard-item:hover i {
    transform: scale(1.05);
}

.standard-item h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--title-primary);
    margin: 0 0 12px 0;
    letter-spacing: -0.01em;
}

.standard-item p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Related Categories Section */
.related-categories {
    margin-bottom: 96px;
}

.related-categories .section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--title-primary);
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 0 0 48px 0;
    letter-spacing: -0.01em;
}

.related-categories .section-title i {
    color: var(--icon-contrast);
    background: var(--accent-gradient);
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-elevated);
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.related-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    padding: 32px;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-subtle);
    text-align: center;
}

.related-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-elevated);
    border-color: var(--primary-blue);
    text-decoration: none;
}

.related-card i {
    color: var(--icon-contrast);
    background: var(--accent-gradient);
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    box-shadow: var(--shadow-elevated);
    margin: 0 auto 20px;
    transition: all 0.3s ease;
}

.related-card:hover i {
    transform: scale(1.05);
}

.related-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--title-primary);
    margin: 0 0 12px 0;
    letter-spacing: -0.01em;
}

.related-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* FAQ Section */
.faq-section {
    margin: 96px auto;
    max-width: 1400px;
    padding: 56px 48px;
    border-radius: 24px;
}

.faq-header {
    text-align: center;
    margin-bottom: 48px;
}

.faq-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--title-primary);
    margin: 0 0 16px 0;
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.faq-title i {
    color: var(--icon-contrast);
    background: var(--accent-gradient);
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow-elevated);
}

.faq-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.faq-container {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-subtle);
}

.faq-item:hover {
    box-shadow: var(--shadow-elevated);
    border-color: var(--primary-blue);
}

.faq-item.active {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-elevated);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 24px 28px;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--title-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    line-height: 1.4;
}

.faq-question:hover {
    background: rgba(0, 122, 255, 0.04);
}

.faq-question:focus {
    outline: none;
    background: rgba(0, 122, 255, 0.08);
}

.faq-icon {
    color: var(--primary-blue);
    font-size: 1.2rem;
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--accent-blue);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s ease;
    background: rgba(0, 122, 255, 0.02);
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer-content {
    padding: 0 28px 28px;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.faq-answer-content p {
    margin: 0 0 16px 0;
}

.faq-answer-content p:last-child {
    margin-bottom: 0;
}

.faq-answer-content strong {
    color: var(--title-primary);
    font-weight: 600;
}

.faq-highlight {
    background: linear-gradient(135deg, #fef3c7 0%, #fed7aa 100%);
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 600;
    color: #92400e;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .calculators-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .standards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .container {
        padding: 20px 16px;
    }
    
    .category-header {
        padding: 40px 32px;
        margin-bottom: 56px;
        flex-direction: column;
        text-align: center;
        gap: 32px;
    }
    
    .category-header h1 {
        font-size: 2.5rem;
    }
    
    .category-description {
        font-size: 1rem;
        max-width: 100%;
    }
    
    .category-stats {
        justify-content: center;
    }
    
    .calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .precision-standards {
        padding: 40px 32px;
    }
    
    .standards-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .related-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-section {
        padding: 40px 32px;
        margin: 72px auto;
    }
    
    .faq-title {
        font-size: 2rem;
        flex-direction: column;
        gap: 12px;
    }
    
    .faq-title i {
        width: 48px;
        height: 48px;
        font-size: 1.25rem;
    }
}

@media (max-width: 640px) {
    .category-header {
        padding: 32px 24px;
        margin-bottom: 48px;
    }
    
    .category-header h1 {
        font-size: 2rem;
    }
    
    .category-description {
        font-size: 0.95rem;
    }
    
    .stat-badge {
        font-size: 0.8rem;
        padding: 8px 12px;
    }
    
    .precision-standards {
        padding: 32px 24px;
    }
    
    .faq-section {
        padding: 32px 24px;
        margin: 56px auto;
    }
    
    .faq-title {
        font-size: 1.75rem;
    }
    
    .faq-question {
        padding: 18px 20px;
        font-size: 0.95rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .faq-icon {
        align-self: flex-end;
        margin-left: 0;
    }
    
    .faq-answer-content {
        padding: 0 20px 20px;
        font-size: 0.9rem;
    }
}