/**
 * Peptide Calculator Styles v2.0.0
 * SEO-optimized tool page styling with clean medical design
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Primary Colors - Medical Blue */
    --pc-primary: #2563eb;
    --pc-primary-dark: #1d4ed8;
    --pc-primary-light: #3b82f6;
    --pc-primary-bg: #eff6ff;
    
    /* Secondary Colors */
    --pc-secondary: #0f766e;
    --pc-secondary-light: #14b8a6;
    
    /* Text Colors */
    --pc-text-primary: #1e293b;
    --pc-text-secondary: #64748b;
    --pc-text-muted: #94a3b8;
    
    /* Background Colors */
    --pc-bg-white: #ffffff;
    --pc-bg-light: #f8fafc;
    --pc-bg-lighter: #f1f5f9;
    --pc-bg-border: #e2e8f0;
    
    /* Status Colors */
    --pc-error: #dc2626;
    --pc-error-bg: #fef2f2;
    --pc-success: #16a34a;
    --pc-success-bg: #f0fdf4;
    --pc-warning: #d97706;
    --pc-warning-bg: #fffbeb;
    
    /* Spacing */
    --pc-spacing-xs: 0.25rem;
    --pc-spacing-sm: 0.5rem;
    --pc-spacing-md: 1rem;
    --pc-spacing-lg: 1.5rem;
    --pc-spacing-xl: 2rem;
    --pc-spacing-2xl: 3rem;
    
    /* Border Radius */
    --pc-radius-sm: 0.375rem;
    --pc-radius-md: 0.5rem;
    --pc-radius-lg: 0.75rem;
    --pc-radius-xl: 1rem;
    
    /* Shadows */
    --pc-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --pc-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --pc-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --pc-transition-fast: 150ms ease-in-out;
    --pc-transition-normal: 250ms ease-in-out;
}

/* ============================================
   Tool Page Layout
   ============================================ */
.peptide-tool-page {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--pc-text-primary);
    max-width: 900px;
    margin: 0 auto;
    padding: var(--pc-spacing-md);
    box-sizing: border-box;
}

.peptide-tool-page * {
    box-sizing: border-box;
}

/* ============================================
   Page Header & Title
   ============================================ */
.peptide-page-header {
    text-align: center;
    margin-bottom: var(--pc-spacing-2xl);
    padding-bottom: var(--pc-spacing-xl);
    border-bottom: 2px solid var(--pc-bg-border);
}

.peptide-page-title {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--pc-text-primary);
    margin: 0 0 var(--pc-spacing-lg) 0;
    line-height: 1.2;
    letter-spacing: -0.025em;
}

@media screen and (max-width: 768px) {
    .peptide-page-title {
        font-size: 1.75rem;
    }
}

/* ============================================
   Anchor Navigation
   ============================================ */
.peptide-anchor-nav {
    margin-top: var(--pc-spacing-lg);
}

.peptide-anchor-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--pc-spacing-sm);
    list-style: none;
    margin: 0;
    padding: 0;
}

.peptide-anchor-link {
    display: inline-block;
    padding: var(--pc-spacing-sm) var(--pc-spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--pc-text-secondary);
    text-decoration: none;
    background: var(--pc-bg-light);
    border: 1px solid var(--pc-bg-border);
    border-radius: var(--pc-radius-md);
    transition: all var(--pc-transition-fast);
}

.peptide-anchor-link:hover,
.peptide-anchor-link:focus {
    color: var(--pc-primary);
    background: var(--pc-primary-bg);
    border-color: var(--pc-primary-light);
    text-decoration: none;
}

@media screen and (max-width: 600px) {
    .peptide-anchor-list {
        gap: var(--pc-spacing-xs);
    }
    
    .peptide-anchor-link {
        padding: var(--pc-spacing-xs) var(--pc-spacing-sm);
        font-size: 0.8125rem;
    }
}

/* ============================================
   Section Styling
   ============================================ */
.peptide-section {
    margin-bottom: var(--pc-spacing-2xl);
}

.peptide-section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--pc-text-primary);
    margin: 0 0 var(--pc-spacing-lg) 0;
    padding-bottom: var(--pc-spacing-sm);
    border-bottom: 2px solid var(--pc-primary);
    display: inline-block;
}

@media screen and (max-width: 768px) {
    .peptide-section-title {
        font-size: 1.25rem;
    }
}

/* ============================================
   Introduction Section
   ============================================ */
.peptide-intro-section {
    background: var(--pc-bg-light);
    padding: var(--pc-spacing-xl);
    border-radius: var(--pc-radius-lg);
    border-left: 4px solid var(--pc-primary);
}

.peptide-intro-content {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--pc-text-secondary);
}

.peptide-intro-content p {
    margin: 0 0 var(--pc-spacing-md) 0;
}

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

/* ============================================
   Calculator Section
   ============================================ */
.peptide-calculator-section {
    scroll-margin-top: var(--pc-spacing-xl);
}

.peptide-calculator-wrapper {
    max-width: 100%;
}

.peptide-calculator-container {
    background: var(--pc-bg-white);
    border-radius: var(--pc-radius-xl);
    box-shadow: var(--pc-shadow-lg);
    overflow: hidden;
    border: 1px solid var(--pc-bg-border);
}

/* ============================================
   Calculator Form
   ============================================ */
.peptide-calculator-form {
    padding: var(--pc-spacing-xl);
}

.peptide-form-group {
    margin-bottom: var(--pc-spacing-lg);
}

.peptide-form-group:last-of-type {
    margin-bottom: var(--pc-spacing-md);
}

.peptide-form-label {
    display: block;
    font-weight: 600;
    font-size: 0.9375rem;
    color: var(--pc-text-primary);
    margin-bottom: var(--pc-spacing-sm);
}

.peptide-form-unit {
    font-weight: 500;
    color: var(--pc-primary);
    font-size: 0.875rem;
    margin-left: var(--pc-spacing-xs);
}

.peptide-form-input {
    width: 100%;
    padding: var(--pc-spacing-md);
    font-size: 1rem;
    border: 2px solid var(--pc-bg-border);
    border-radius: var(--pc-radius-md);
    background: var(--pc-bg-white);
    color: var(--pc-text-primary);
    transition: all var(--pc-transition-fast);
    outline: none;
}

.peptide-form-input::placeholder {
    color: var(--pc-text-muted);
}

.peptide-form-input:hover {
    border-color: var(--pc-primary-light);
}

.peptide-form-input:focus {
    border-color: var(--pc-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.peptide-form-hint {
    display: block;
    font-size: 0.8125rem;
    color: var(--pc-text-secondary);
    margin-top: var(--pc-spacing-xs);
}

/* ============================================
   Form Actions
   ============================================ */
.peptide-form-actions {
    display: flex;
    gap: var(--pc-spacing-md);
    margin-top: var(--pc-spacing-xl);
}

.peptide-calculate-btn,
.peptide-reset-btn {
    flex: 1;
    padding: var(--pc-spacing-md) var(--pc-spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--pc-radius-md);
    cursor: pointer;
    transition: all var(--pc-transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.peptide-calculate-btn {
    background: linear-gradient(135deg, var(--pc-primary) 0%, var(--pc-primary-dark) 100%);
    color: white;
    box-shadow: var(--pc-shadow-md);
}

.peptide-calculate-btn:hover,
.peptide-calculate-btn:focus {
    background: linear-gradient(135deg, var(--pc-primary-dark) 0%, #1e40af 100%);
    transform: translateY(-1px);
    box-shadow: var(--pc-shadow-lg);
    outline: none;
}

.peptide-calculate-btn:active {
    transform: translateY(0);
    box-shadow: var(--pc-shadow-sm);
}

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

.peptide-reset-btn:hover,
.peptide-reset-btn:focus {
    background: var(--pc-bg-border);
    color: var(--pc-text-primary);
    border-color: var(--pc-text-muted);
    outline: none;
}

@media screen and (max-width: 480px) {
    .peptide-form-actions {
        flex-direction: column;
    }
}

/* ============================================
   Error Messages
   ============================================ */
.peptide-error-container {
    display: flex;
    align-items: center;
    gap: var(--pc-spacing-sm);
    margin: 0 var(--pc-spacing-xl) var(--pc-spacing-lg) var(--pc-spacing-xl);
    padding: var(--pc-spacing-md) var(--pc-spacing-lg);
    background: var(--pc-error-bg);
    border: 1px solid #fecaca;
    border-radius: var(--pc-radius-md);
    color: var(--pc-error);
    font-size: 0.9375rem;
    font-weight: 500;
    animation: slideDown var(--pc-transition-normal);
}

.peptide-error-icon {
    font-size: 1.125rem;
    flex-shrink: 0;
}

.peptide-error-message {
    flex: 1;
}

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

/* ============================================
   Results Section
   ============================================ */
.peptide-results {
    padding: 0 var(--pc-spacing-xl) var(--pc-spacing-xl) var(--pc-spacing-xl);
    animation: fadeIn var(--pc-transition-normal);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.peptide-results-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--pc-text-primary);
    margin: 0 0 var(--pc-spacing-lg) 0;
    padding-bottom: var(--pc-spacing-sm);
    border-bottom: 2px solid var(--pc-bg-border);
}

.peptide-results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--pc-spacing-md);
    margin-bottom: var(--pc-spacing-lg);
}

.peptide-result-card {
    background: var(--pc-bg-light);
    border: 2px solid var(--pc-bg-border);
    border-radius: var(--pc-radius-lg);
    padding: var(--pc-spacing-lg);
    text-align: center;
    transition: all var(--pc-transition-fast);
}

.peptide-result-card:hover {
    border-color: var(--pc-primary-light);
    transform: translateY(-2px);
    box-shadow: var(--pc-shadow-md);
}

.peptide-result-card-primary {
    background: linear-gradient(135deg, var(--pc-primary-bg) 0%, #dbeafe 100%);
    border-color: var(--pc-primary-light);
}

.peptide-result-card-primary:hover {
    border-color: var(--pc-primary);
}

.peptide-result-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--pc-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--pc-spacing-sm);
}

.peptide-result-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--pc-text-primary);
    line-height: 1.2;
    margin-bottom: var(--pc-spacing-xs);
}

.peptide-result-card-primary .peptide-result-value {
    color: var(--pc-primary);
}

.result-number {
    font-variant-numeric: tabular-nums;
}

.peptide-result-unit {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--pc-text-secondary);
    margin-left: var(--pc-spacing-xs);
}

.peptide-result-formula {
    font-size: 0.6875rem;
    color: var(--pc-text-muted);
    font-style: italic;
}

@media screen and (max-width: 600px) {
    .peptide-results-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Summary Section
   ============================================ */
.peptide-summary {
    background: var(--pc-success-bg);
    border: 1px solid #bbf7d0;
    border-radius: var(--pc-radius-md);
    padding: var(--pc-spacing-lg);
    text-align: center;
}

.peptide-summary-text {
    margin: 0;
    font-size: 1rem;
    color: var(--pc-text-primary);
    line-height: 1.6;
}

.summary-highlight {
    color: var(--pc-success);
    font-weight: 700;
}

/* ============================================
   Formula Section
   ============================================ */
.peptide-formula-section {
    scroll-margin-top: var(--pc-spacing-xl);
}

.peptide-formula-content {
    display: flex;
    flex-direction: column;
    gap: var(--pc-spacing-lg);
}

.peptide-formula-box {
    background: var(--pc-bg-white);
    border: 1px solid var(--pc-bg-border);
    border-radius: var(--pc-radius-lg);
    padding: var(--pc-spacing-lg);
    box-shadow: var(--pc-shadow-sm);
}

.peptide-formula-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--pc-text-primary);
    margin: 0 0 var(--pc-spacing-sm) 0;
}

.peptide-formula-code {
    display: block;
    background: var(--pc-bg-lighter);
    padding: var(--pc-spacing-md);
    border-radius: var(--pc-radius-md);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.9375rem;
    color: var(--pc-primary);
    margin-bottom: var(--pc-spacing-sm);
    overflow-x: auto;
}

.peptide-formula-desc {
    font-size: 0.9375rem;
    color: var(--pc-text-secondary);
    margin: 0;
}

/* ============================================
   Example Section
   ============================================ */
.peptide-example-section {
    scroll-margin-top: var(--pc-spacing-xl);
}

.peptide-example-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--pc-spacing-xl);
}

@media screen and (max-width: 768px) {
    .peptide-example-content {
        grid-template-columns: 1fr;
    }
}

.peptide-example-scenario,
.peptide-example-steps {
    background: var(--pc-bg-white);
    border: 1px solid var(--pc-bg-border);
    border-radius: var(--pc-radius-lg);
    padding: var(--pc-spacing-lg);
    box-shadow: var(--pc-shadow-sm);
}

.peptide-example-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--pc-text-primary);
    margin: 0 0 var(--pc-spacing-md) 0;
}

.peptide-example-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.peptide-example-list li {
    padding: var(--pc-spacing-sm) 0;
    border-bottom: 1px solid var(--pc-bg-border);
    font-size: 0.9375rem;
}

.peptide-example-list li:last-child {
    border-bottom: none;
}

.peptide-example-steps-list {
    margin: 0 0 var(--pc-spacing-lg) 0;
    padding-left: var(--pc-spacing-lg);
}

.peptide-example-steps-list li {
    padding: var(--pc-spacing-sm) 0;
    font-size: 0.9375rem;
    color: var(--pc-text-secondary);
}

.peptide-example-result {
    background: var(--pc-primary-bg);
    border: 1px solid #bfdbfe;
    border-radius: var(--pc-radius-md);
    padding: var(--pc-spacing-md);
    font-size: 0.9375rem;
    color: var(--pc-text-primary);
}

/* ============================================
   FAQ Section
   ============================================ */
.peptide-faq-section {
    scroll-margin-top: var(--pc-spacing-xl);
}

.peptide-faq-container {
    display: flex;
    flex-direction: column;
    gap: var(--pc-spacing-sm);
}

.peptide-faq-item {
    background: var(--pc-bg-white);
    border: 1px solid var(--pc-bg-border);
    border-radius: var(--pc-radius-md);
    overflow: hidden;
}

.peptide-faq-question {
    margin: 0;
}

.peptide-faq-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--pc-spacing-md) var(--pc-spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    color: var(--pc-text-primary);
    background: var(--pc-bg-light);
    border: none;
    cursor: pointer;
    text-align: left;
    transition: background var(--pc-transition-fast);
}

.peptide-faq-toggle:hover,
.peptide-faq-toggle:focus {
    background: var(--pc-bg-lighter);
    outline: none;
}

.peptide-faq-toggle[aria-expanded="true"] {
    background: var(--pc-primary-bg);
    color: var(--pc-primary);
}

.peptide-faq-icon {
    font-size: 1.25rem;
    font-weight: 400;
    transition: transform var(--pc-transition-fast);
}

.peptide-faq-toggle[aria-expanded="true"] .peptide-faq-icon {
    transform: rotate(45deg);
}

.peptide-faq-answer {
    padding: var(--pc-spacing-md) var(--pc-spacing-lg);
    font-size: 0.9375rem;
    color: var(--pc-text-secondary);
    line-height: 1.7;
    border-top: 1px solid var(--pc-bg-border);
}

.peptide-faq-answer[hidden] {
    display: none;
}

/* ============================================
   Disclaimer Section
   ============================================ */
.peptide-disclaimer-section {
    margin-top: var(--pc-spacing-2xl);
    padding-top: var(--pc-spacing-xl);
    border-top: 2px solid var(--pc-bg-border);
}

.peptide-disclaimer-container {
    background: var(--pc-warning-bg);
    border: 1px solid #fcd34d;
    border-radius: var(--pc-radius-lg);
    padding: var(--pc-spacing-lg);
}

.peptide-disclaimer-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--pc-warning);
    margin: 0 0 var(--pc-spacing-md) 0;
    display: flex;
    align-items: center;
    gap: var(--pc-spacing-sm);
}

.peptide-disclaimer-title::before {
    content: '⚠';
    font-size: 1.25rem;
}

.peptide-disclaimer-content {
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--pc-text-secondary);
}

.peptide-disclaimer-content p {
    margin: 0;
}

/* ============================================
   AdSense Friendly Spacing
   ============================================ */
.peptide-section::after {
    content: '';
    display: block;
    height: var(--pc-spacing-xl);
    clear: both;
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .peptide-tool-page {
        max-width: 100%;
        padding: 0;
    }
    
    .peptide-anchor-nav,
    .peptide-form-actions,
    .peptide-error-container,
    .peptide-faq-toggle {
        display: none !important;
    }
    
    .peptide-faq-answer {
        display: block !important;
    }
    
    .peptide-calculator-container,
    .peptide-section {
        box-shadow: none;
        border: 1px solid #000;
        break-inside: avoid;
    }
    
    .peptide-results {
        display: block !important;
    }
}

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

/* ============================================
   High Contrast Mode
   ============================================ */
@media (prefers-contrast: high) {
    .peptide-calculator-container,
    .peptide-section,
    .peptide-formula-box,
    .peptide-example-scenario,
    .peptide-example-steps,
    .peptide-faq-item {
        border-width: 2px;
    }
    
    .peptide-form-input {
        border-width: 2px;
    }
    
    .peptide-calculate-btn {
        border: 2px solid currentColor;
    }
}

/* ============================================
   Focus Visible for Keyboard Navigation
   ============================================ */
.peptide-anchor-link:focus-visible,
.peptide-form-input:focus-visible,
.peptide-calculate-btn:focus-visible,
.peptide-reset-btn:focus-visible,
.peptide-faq-toggle:focus-visible {
    outline: 3px solid var(--pc-primary);
    outline-offset: 2px;
}