/* 1. Foundational Styles
-------------------------------------------- */

:root {
    /* Colors */
    --primary-color: #4682B4; /* SteelBlue */
    --primary-color-dark: #5a9bd3;
    --text-primary: #333333;
    --text-secondary: #6c757d;
    --background-primary: #f5f5f5; /* Light Gray */
    --background-secondary: #ffffff;
    --background-tertiary: #e9ecef;
    --border-color: #dee2e6;
    --border-light: #f1f3f5;
    --input-background: #ffffff;
    --input-focus-background: #ffffff;
    --white: #fff;

    /* Status Colors */
    --status-success-bg: #d4edda;
    --status-error-bg: #f8d7da;
    --status-info-bg: #cce7ff;
    --status-warning-bg: #fff3cd;
    --warning-color: #ffc107;

    /* BMI Category Colors */
    --category-underweight: #0d6efd; /* Blue */
    --category-normal: #198754;      /* Green */
    --category-overweight: #ffc107; /* Yellow */
    --category-obese: #dc3545;       /* Red */

    /* Spacing & Radius */
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --border-radius-lg: 0.8rem;
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #5a9bd3;
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --background-primary: #000000; /* Pure Black */
        --background-secondary: #1a1a1a;
        --background-tertiary: #333333;
        --border-color: #333333;
        --border-light: #4a4a4a;
        --input-background: #1a1a1a;
        --input-focus-background: #333333;

        --status-success-bg: #032d1a;
        --status-error-bg: #3c1113;
        --status-info-bg: #002a4d;
        --status-warning-bg: #332701;
    }
}

.dark-mode {
    --primary-color: #5a9bd3 !important;
    --text-primary: #f9fafb !important;
    --text-secondary: #d1d5db !important;
    --background-primary: #000000 !important; 
    --background-secondary: #1a1a1a !important;
    --background-tertiary: #333333 !important;
    --border-color: #333333 !important;
    --border-light: #4a4a4a !important;
    --input-background: #1a1a1a !important;
    --input-focus-background: #333333 !important;

    --status-success-bg: #032d1a !important;
    --status-error-bg: #3c1113 !important;
    --status-info-bg: #002a4d !important;
    --status-warning-bg: #332701 !important;
}

.dark-mode .btn-secondary {
    background-color: var(--background-tertiary);
    color: var(--text-primary);
}

.dark-mode .result-card {
    background-color: var(--background-secondary);
}

body.bmi-calculator-tool {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-primary);
    color: var(--text-primary);
    margin: 0;
    padding-top: 100px; /* Header spacing fix */
    transition: background-color 0.3s, color 0.3s;
}

.bmi-calculator-tool .container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* 2. General Components (Cards, Buttons, etc.)
-------------------------------------------- */

.bmi-calculator-tool .card {
    background-color: var(--background-secondary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.bmi-calculator-tool .card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.bmi-calculator-tool .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem var(--spacing-lg);
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.bmi-calculator-tool .btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.bmi-calculator-tool .btn-primary:hover {
    background-color: var(--primary-color-dark);
    transform: translateY(-2px);
}

.bmi-calculator-tool .btn-secondary {
    background-color: var(--background-tertiary);
    color: var(--text-primary);
}

.bmi-calculator-tool .btn-secondary:hover {
    background-color: var(--border-light);
}

/* 3. Tool-Specific Styles
-------------------------------------------- */

.bmi-calculator-tool .tool-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.bmi-calculator-tool .tool-header h1 {
    font-size: 2.8rem;
    font-weight: 700;
    margin: 0 0 var(--spacing-md) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.bmi-calculator-tool .tool-header h1 i {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.bmi-calculator-tool .tool-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Form Styles */
.bmi-calculator-tool .form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.bmi-calculator-tool .form-group {
    display: flex;
    flex-direction: column;
}

.bmi-calculator-tool .form-group label {
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
}

.bmi-calculator-tool .input-wrapper {
    position: relative;
}

.bmi-calculator-tool .form-control {
    width: 100%;
    padding: 0.8rem var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--input-background);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.bmi-calculator-tool .form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(70, 130, 180, 0.2);
}

.bmi-calculator-tool .form-control.error {
    border-color: #dc3545;
}

.bmi-calculator-tool .error-message {
    color: #dc3545;
    font-size: 0.85rem;
    margin-top: var(--spacing-sm);
    display: none; /* Hidden by default */
}

/* Unit & Gender Toggles */
.bmi-calculator-tool .unit-toggle, .bmi-calculator-tool .gender-selection {
    display: flex;
    background-color: var(--background-tertiary);
    border-radius: 50px;
    padding: var(--spacing-xs);
    width: 100%;
}

.bmi-calculator-tool .unit-option, .bmi-calculator-tool .gender-option {
    flex: 1;
    position: relative;
}

.bmi-calculator-tool .unit-option input, .bmi-calculator-tool .gender-option input {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.bmi-calculator-tool .unit-label, .bmi-calculator-tool .gender-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.7rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    text-align: center;
}

.bmi-calculator-tool .unit-option input:checked + .unit-label,
.bmi-calculator-tool .gender-option input:checked + .gender-label {
    background-color: var(--primary-color);
    color: var(--white);
    box-shadow: 0 2px 8px rgba(70, 130, 180, 0.3);
}

/* Results & Content Styles */
.bmi-calculator-tool .results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.bmi-calculator-tool .result-card {
    background-color: var(--background-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
}

.bmi-calculator-tool .result-card h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0 0 var(--spacing-sm) 0;
}

.bmi-calculator-tool .result-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.bmi-calculator-tool .result-card .unit {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.bmi-calculator-tool .content-section {
    margin-bottom: var(--spacing-xl);
}

.bmi-calculator-tool .content-section:last-child {
    margin-bottom: 0;
}

.bmi-calculator-tool .content-section h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 2px solid var(--border-light);
    padding-bottom: var(--spacing-sm);
}

.bmi-calculator-tool .content-section ul {
    padding-left: var(--spacing-md);
    text-align: left;
}

.bmi-calculator-tool .content-section li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

/* Disclaimer */
.bmi-calculator-tool .disclaimer {
    background-color: var(--status-warning-bg);
    color: #856404;
    border: 1px solid var(--warning-color);
    border-left-width: 5px;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-size: 0.9rem;
}

.bmi-calculator-tool.dark-mode .disclaimer {
    background-color: #332701;
    color: #ffc107;
    border-color: #4d3802;
}

/* 4. Animations & Media Queries
-------------------------------------------- */

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

.bmi-calculator-tool .results-grid, .bmi-calculator-tool .content-section, .bmi-calculator-tool .disclaimer {
    animation: fadeIn 0.5s ease-in-out forwards;
}

@media (max-width: 768px) {
    body.bmi-calculator-tool {
        padding-top: 80px;
    }

    .bmi-calculator-tool .container {
        padding: var(--spacing-md);
    }

    .bmi-calculator-tool .tool-header h1 {
        font-size: 2.2rem;
    }

    .bmi-calculator-tool .form-grid {
        grid-template-columns: 1fr;
    }

    .bmi-calculator-tool .action-buttons {
        flex-direction: column;
    }

    .bmi-calculator-tool .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .bmi-calculator-tool .card {
        padding: var(--spacing-lg);
    }

    .bmi-calculator-tool .tool-header h1 {
        font-size: 1.8rem;
        gap: var(--spacing-sm);
    }

    .bmi-calculator-tool .tool-header h1 i {
        font-size: 1.6rem;
    }

    .bmi-calculator-tool .unit-label, .bmi-calculator-tool .gender-label {
        font-size: 0.8rem;
        padding: 0.6rem;
    }
}

/* Recommended Tools, FAQ, Ads */
.bmi-calculator-tool .recommended-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.bmi-calculator-tool .tool-card-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--background-tertiary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
}

.bmi-calculator-tool .tool-card-link:hover {
    transform: translateY(-5px);
    background-color: var(--border-light);
    box-shadow: var(--shadow-md);
}

.bmi-calculator-tool .tool-card-link i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.bmi-calculator-tool .faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
}

.bmi-calculator-tool .faq-item:last-child {
    border-bottom: none;
}

.bmi-calculator-tool .faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.bmi-calculator-tool .faq-question::after {
    content: '\f078'; /* Font Awesome chevron-down */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    transition: transform 0.3s ease;
}

.bmi-calculator-tool .faq-question[aria-expanded='true']::after {
    transform: rotate(180deg);
}

.bmi-calculator-tool .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    color: var(--text-secondary);
    padding-top: var(--spacing-sm);
}

.bmi-calculator-tool .faq-answer p {
    margin: 0;
    padding-top: var(--spacing-sm);
    line-height: 1.6;
}

.bmi-calculator-tool .ad-placeholder {
    background-color: var(--background-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: 600;
    margin: var(--spacing-lg) auto;
    min-height: 90px;
    text-align: center;
}

/* BMI Category Ranges */
.bmi-calculator-tool .bmi-ranges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.bmi-calculator-tool .range-card {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    text-align: center;
    color: var(--white);
    transition: all 0.3s ease;
}

.bmi-calculator-tool .range-card h4 {
    margin: 0 0 0.25rem 0;
    font-size: 1rem;
    font-weight: 600;
}

.bmi-calculator-tool .range-card p {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 500;
}

.bmi-calculator-tool .range-card.category-underweight {
    background-color: var(--category-underweight);
}

.bmi-calculator-tool .range-card.category-normal {
    background-color: var(--category-normal);
}

.bmi-calculator-tool .range-card.category-overweight {
    background-color: var(--category-overweight);
    color: var(--text-primary); /* Yellow needs dark text */
}

.bmi-calculator-tool .range-card.category-obese {
    background-color: var(--category-obese);
}

/* Main Result Color Coding */
.bmi-calculator-tool .result-card .value.category-underweight,
.bmi-calculator-tool .result-card .unit.category-underweight {
    color: var(--category-underweight);
}

.bmi-calculator-tool .result-card .value.category-normal,
.bmi-calculator-tool .result-card .unit.category-normal {
    color: var(--category-normal);
}

.bmi-calculator-tool .result-card .value.category-overweight,
.bmi-calculator-tool .result-card .unit.category-overweight {
    color: var(--category-overweight);
}

.bmi-calculator-tool .result-card .value.category-obese,
.bmi-calculator-tool .result-card .unit.category-obese {
    color: var(--category-obese);
}

/* Dark Mode Specificity Fixes */
.bmi-calculator-tool.dark-mode .card {
    background: var(--background-secondary) !important;
    border-color: var(--border-color) !important;
}

.bmi-calculator-tool.dark-mode .form-control {
    background-color: var(--input-background) !important;
    color: var(--text-primary) !important;
    border-color: var(--border-color) !important;
}

.bmi-calculator-tool.dark-mode .form-control:focus {
    background-color: var(--input-focus-background) !important;
    border-color: var(--primary-color) !important;
}

.bmi-calculator-tool.dark-mode .unit-toggle, 
.bmi-calculator-tool.dark-mode .gender-selection {
    background-color: var(--background-tertiary) !important;
}

.bmi-calculator-tool.dark-mode .btn-secondary {
    background-color: var(--background-tertiary) !important;
    color: var(--text-primary) !important;
}

.bmi-calculator-tool.dark-mode .btn-secondary:hover {
    background-color: var(--border-light) !important;
}