/* ===============================================
   BMI CALCULATOR - USING MODERNTOOLS UNIFIED THEME WITH BLUE-GREEN ACCENT
   =============================================== */

/* Use modern tools color scheme with blue-green theme */
:root {
    --primary-color: #0066cc;
    --secondary-color: #00cec8;
    --accent-color: #0088ff;
    --text-color: #111827;
    --text-secondary: #4B5563;
    --text-tertiary: #6B7280;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border-color: #E5E7EB;
    --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);
    --radius-base: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;    
    --radius-2xl: 1.5rem;
    
    /* Gray color scale for consistency */
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    
    /* BMI specific colors */
    --underweight-color: #3B82F6;
    --normal-color: #10B981;
    --overweight-color: #F59E0B;
    --obese-color: #EF4444;
    
    /* Success and warning colors */
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
    
    /* Aliases for compatibility */
    --brand-primary: var(--primary-color);
    --brand-secondary: var(--secondary-color);
    --text-primary: var(--text-color);
}

/* Dark theme */
[data-theme="dark"] {
    --text-color: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-tertiary: #9CA3AF;
    --bg-primary: #111827;
    --bg-secondary: #1F2937;
    --bg-tertiary: #374151;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    
    /* Gray color scale for dark theme */
    --gray-100: #374151;
    --gray-200: #4B5563;
    --gray-300: #6B7280;
    --gray-400: #9CA3AF;
    
    /* Aliases for compatibility */
    --brand-primary: var(--primary-color);
    --brand-secondary: var(--secondary-color);
    --text-primary: var(--text-color);
}

/* Theme-aware background support */
body {
    background: var(--bg-primary);
}

/* Main Layout */
.main-content {
    min-height: 100vh;
}

/* ===============================================
   HERO SECTION STYLES
   =============================================== */

.tool-hero {
    margin-top: 0;
    padding: 120px 0 80px;
    position: relative;
    z-index: 2;
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(59, 130, 246, 0.1) 30%, rgba(16, 185, 129, 0.1) 70%, var(--bg-primary) 100%);
    overflow: hidden;
}

.tool-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(0, 102, 204, 0.03) 0%, 
        rgba(0, 206, 200, 0.05) 50%, 
        rgba(0, 136, 255, 0.03) 100%);
    z-index: -1;
}

.tool-hero .container {
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-icon {
    width: 120px;
    height: 120px;
    margin: 0 auto 32px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.hero-icon i {
    font-size: 48px;
    color: white;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    line-height: 1.1;
}

.hero-content p {
    font-size: clamp(1.125rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* ===============================================
   CALCULATOR SECTION STYLES
   =============================================== */

.calculator-main {
    padding: 80px 0 120px;
    background: var(--bg-primary);
}

.calculator-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Mode Toggle */
.calculator-mode-toggle {
    margin-bottom: 32px;
    display: flex;
    justify-content: center;
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-secondary);
    padding: 8px 20px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.toggle-label {
    font-weight: 600;
    color: var(--text-tertiary);
    user-select: none;
}

.toggle-label.active {
    color: var(--primary-color);
}

.mode-toggle {
    position: relative;
    width: 60px;
    height: 32px;
    background: var(--gray-200);
    border: none;
    border-radius: 16px;
    cursor: pointer;
}

.mode-toggle.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 28px;
    height: 28px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.mode-toggle.active .toggle-slider {
    transform: translateX(28px);
}

/* Calculator Card */
.calculator-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    margin-bottom: 40px;
}

/* Display Area */
.calculator-display {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.display-result {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
}

.result-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
}

.result-unit {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.display-formula {
    font-size: 1rem;
    color: var(--text-tertiary);
    font-weight: 500;
}

/* Input Sections */
.calculator-inputs {
    margin-bottom: 32px;
}

.input-section {
    display: none;
}

.input-section.active {
    display: block;
}

.metric-inputs,
.imperial-inputs {
    display: grid;
    gap: 24px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}

.input-group input {
    padding: 16px 20px;
    border: 2px solid var(--border-color);    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.input-group input:invalid {
    border-color: var(--border-color); /* Default border for untouched invalid fields */
}

.input-group input.user-touched:invalid {
    border-color: var(--danger-color); /* Red border only after user interaction */
}

/* Height Imperial Inputs */
.height-imperial {
    display: grid;
    grid-template-columns: 1fr auto 1fr auto;
    gap: 12px;
    align-items: center;
}

.unit-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Action Buttons */
.calculator-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    padding-top: 12px;
}

.btn {
    display: flex;    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px 32px;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    min-width: 140px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    box-shadow: var(--shadow-lg);
}

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

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

/* ===============================================
   RESULTS SECTION STYLES
   =============================================== */

.results-section {
    margin-bottom: 40px;
}

.results-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.result-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.result-header {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.result-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 16px;
}

.bmi-value {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.result-content {
    display: grid;
    gap: 32px;
}

/* Category Indicator */
.category-indicator {
    text-align: center;
}

.category-bar {
    position: relative;
    height: 12px;
    border-radius: 6px;
    display: flex;
    margin-bottom: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.category-segment {
    flex: 1;
    height: 100%;
}

.category-segment.underweight {
    background: var(--underweight-color);
}

.category-segment.normal {
    background: var(--normal-color);
}

.category-segment.overweight {
    background: var(--overweight-color);
}

.category-segment.obese {
    background: var(--obese-color);
}

.category-pointer {
    position: absolute;
    top: -4px;
    width: 20px;
    height: 20px;
    background: var(--text-color);
    border: 3px solid white;
    border-radius: 50%;
    transform: translateX(-50%);
    box-shadow: var(--shadow-md);
}

.category-labels {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* Category Result */
.category-result h4,
.weight-range h4,
.recommendations h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 12px;
}

.category-result p {
    font-size: 1.125rem;
    font-weight: 600;
    padding: 12px 20px;
    border-radius: var(--radius-lg);
    text-align: center;
}

.weight-range p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

/* Recommendations */
.recommendations ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 12px;
}

.recommendations li {
    padding: 16px 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Category-specific styling */
.category-underweight {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--underweight-color);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.category-normal {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--normal-color);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.category-overweight {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--overweight-color);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.category-obese {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--obese-color);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ===============================================
   INFO SECTION STYLES
   =============================================== */

.info-section {
    margin-top: 60px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.info-card {
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.info-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.info-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
}

.info-header i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* BMI Chart */
.bmi-chart {
    display: grid;
    gap: 16px;
}

.chart-item {
    display: grid;
    grid-template-columns: 20px 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 12px 0;
}

.chart-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.chart-color.underweight {
    background: var(--underweight-color);
}

.chart-color.normal {
    background: var(--normal-color);
}

.chart-color.overweight {
    background: var(--overweight-color);
}

.chart-color.obese {
    background: var(--obese-color);
}

.chart-range {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.chart-label {
    font-weight: 700;
    color: var(--text-color);
    text-align: right;
}

/* Info Content */
.info-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

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

.info-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.info-content li {
    padding: 8px 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 24px;
}

.info-content li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ===============================================
   PERSONAL INFORMATION SECTION
   =============================================== */

.personal-info {
    margin-bottom: 32px;
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.input-group select {
    padding: 16px 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
}

.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.input-group select option {
    background: var(--bg-primary);
    color: var(--text-color);
    padding: 10px;
}

/* Personal Summary in Results */
.personal-summary {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.personal-summary h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 16px;
    text-align: center;
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.summary-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.summary-value {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1rem;
}

/* Age and Gender Specific Notes */
.age-specific-note,
.gender-note {
    margin-top: 12px;
    padding: 12px 16px;
    background: rgba(0, 102, 204, 0.05);
    border-left: 4px solid var(--primary-color);
    border-radius: 0 var(--radius-base) var(--radius-base) 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.age-specific-note.warning {
    background: rgba(245, 158, 11, 0.05);
    border-left-color: var(--warning-color);
}

.age-specific-note.info {
    background: rgba(59, 130, 246, 0.05);
    border-left-color: var(--underweight-color);
}

/* ===============================================
   RESPONSIVE DESIGN
   =============================================== */

@media (max-width: 768px) {
    .tool-hero {
        padding: 100px 0 60px;
    }
    
    .hero-content {
        padding: 0 20px;
    }
    
    .hero-icon {
        width: 80px;
        height: 80px;
        margin-bottom: 24px;
    }
    
    .hero-icon i {
        font-size: 32px;
    }
    
    .calculator-main {
        padding: 60px 0 80px;
    }
    
    .calculator-card {
        padding: 24px;
        margin: 0 20px;
    }
    
    .calculator-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .result-card {
        padding: 24px;
        margin: 0 20px;
    }
    
    .bmi-value {
        font-size: 3rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        padding: 0 20px;
    }
    
    .height-imperial {
        grid-template-columns: 1fr auto 1fr auto;
        gap: 8px;
    }
    
    .category-labels {
        font-size: 0.75rem;
    }
    
    /* Responsive design for new elements */
    .input-row {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .summary-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .personal-info {
        padding: 20px;
        margin-bottom: 24px;
    }
}

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .result-value {
        font-size: 2.5rem;
    }
    
    .bmi-value {
        font-size: 2.5rem;
    }
    
    .toggle-container {
        gap: 12px;
        padding: 6px 16px;
    }
    
    .calculator-display {
        padding: 20px;
    }
}