/* ==========================================================================
   Preservative Efficacy Testing - Stylesheet
   Brand Colors: #6B46C1 (primary purple), #14B8A6 (accent teal)
   ========================================================================== */

/* CSS Variables */
:root {
    --color-primary: #6B46C1;
    --color-primary-dark: #553C9A;
    --color-primary-light: #E9D5FF;
    --color-accent: #14B8A6;
    --color-accent-light: #CCFBF1;
    --color-text: #1A1A2E;
    --color-text-light: #4A5568;
    --color-white: #FFFFFF;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --transition: 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

strong {
    font-weight: 600;
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm);
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation */
.main-nav {
    position: sticky;
    top: 0;
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-primary);
}

.nav-logo:hover {
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    margin: 0;
    padding: 0;
}

.nav-menu a {
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.9375rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all var(--transition);
}

.nav-menu a:hover {
    color: var(--color-primary);
    text-decoration: none;
    background: var(--color-primary-light);
}

.nav-cta {
    background: var(--color-primary) !important;
    color: var(--color-white) !important;
}

.nav-cta:hover {
    background: var(--color-primary-dark) !important;
    color: var(--color-white) !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle-bar {
    width: 24px;
    height: 3px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 50%, var(--color-accent-light) 100%);
    padding: var(--spacing-xxl) 0;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-content h1 {
    font-size: 2.75rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.hero-ctas {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.hero-trust {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.hero-trust span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.hero-trust span::before {
    content: '✓';
    color: var(--color-accent);
    font-weight: 700;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

/* Sections */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-alt {
    background: var(--color-gray-50);
}

/* Summary Section */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.summary-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    text-align: center;
    border-top: 4px solid var(--color-primary);
}

.summary-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.summary-card h3 {
    font-size: 1rem;
    color: var(--color-text-light);
    margin: 0 0 var(--spacing-xs);
}

.summary-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.summary-card p:last-child {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin: 0;
}

.summary-callout {
    background: var(--color-primary-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-primary);
}

.summary-callout p {
    margin: 0;
}

/* Callout Boxes */
.callout {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    margin: var(--spacing-xl) 0;
}

.callout h4 {
    margin-top: 0;
}

.callout-info {
    background: var(--color-accent-light);
    border-left: 4px solid var(--color-accent);
}

.callout-recommendation {
    background: var(--color-primary-light);
    border-left: 4px solid var(--color-primary);
}

.callout-savings {
    background: #FEF3C7;
    border-left: 4px solid #F59E0B;
}

.callout ul {
    margin-bottom: 0;
}

/* Images */
.image-container {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.image-container img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.decision-tree-img {
    max-width: 500px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

th, td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-gray-200);
}

th {
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 600;
}

tr:hover {
    background: var(--color-gray-50);
}

.comparison-table td:first-child,
.pricing-table td:first-child {
    font-weight: 600;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--color-primary-light);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-bottom: var(--spacing-xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: calc(-1 * var(--spacing-xl) - 12px);
    width: 28px;
    height: 28px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

.timeline-content {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

.timeline-content h4 {
    color: var(--color-primary);
    margin-top: 0;
}

.timeline-content p {
    margin-bottom: 0;
}

/* Checklist */
.checklist {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin: var(--spacing-xl) 0;
}

.checklist h3 {
    margin-top: 0;
    color: var(--color-primary);
}

.checklist ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.checklist li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.checklist li::before {
    content: '☐';
    color: var(--color-primary);
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* Section CTA */
.section-cta {
    margin-top: var(--spacing-xl);
    text-align: center;
}

/* Video Container */
.video-container {
    margin: var(--spacing-xl) 0;
}

.video-container h3 {
    margin-top: 0;
}

.video-container iframe {
    width: 100%;
    max-width: 560px;
    aspect-ratio: 16/9;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

/* FAQ Section */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-white);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

.faq-question:hover {
    background: var(--color-gray-50);
}

.faq-icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--color-primary);
    transition: transform var(--transition);
}

.faq-icon::before {
    width: 2px;
    height: 14px;
    left: 11px;
    top: 5px;
}

.faq-icon::after {
    width: 14px;
    height: 2px;
    left: 5px;
    top: 11px;
}

.faq-question[aria-expanded="true"] .faq-icon::before {
    transform: rotate(90deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition);
}

.faq-answer p {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    margin: 0;
}

/* Resources */
.resource-list {
    display: grid;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.resource-item {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--color-accent);
}

.resource-item h4 {
    margin: 0 0 var(--spacing-xs);
}

.resource-item h4 a {
    color: var(--color-primary);
}

.resource-item p {
    margin: 0;
    color: var(--color-text-light);
    font-size: 0.9375rem;
}

/* Contact Section */
.section-contact {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-gray-50) 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: var(--spacing-xxl);
    align-items: start;
}

.contact-form-container {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: grid;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 600;
    font-size: 0.9375rem;
}

.required {
    color: #DC2626;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-sm);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group-checkbox {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.form-group-checkbox input {
    margin-top: 4px;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.form-group-checkbox label {
    font-weight: 400;
    font-size: 0.875rem;
}

.btn-submit {
    margin-top: var(--spacing-sm);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.trust-signals,
.contact-summary {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.trust-signals h3,
.contact-summary h3 {
    margin-top: 0;
    font-size: 1.125rem;
    color: var(--color-primary);
}

.trust-signals ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.trust-signals li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
}

.check-icon {
    color: var(--color-accent);
    font-weight: 700;
}

.contact-summary p {
    margin-bottom: var(--spacing-xs);
}

.contact-summary p:last-child {
    margin-bottom: 0;
}

/* Footer */
.site-footer {
    background: var(--color-text);
    color: var(--color-gray-300);
    padding: var(--spacing-xl) 0;
}

.footer-content {
    text-align: center;
}

.footer-disclaimer {
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    font-size: 0.875rem;
}

.footer-disclaimer p {
    margin: 0;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.footer-links a {
    color: var(--color-gray-300);
    font-size: 0.875rem;
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-copyright {
    font-size: 0.875rem;
}

.footer-copyright p {
    margin: 0;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .hero-image {
        order: -1;
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .checklist ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-trust {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .hero-ctas {
        flex-direction: column;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
        display: none;
    }

    .nav-menu-open {
        display: flex;
    }

    .summary-grid {
        grid-template-columns: 1fr;
    }

    .timeline {
        padding-left: var(--spacing-lg);
    }

    .timeline-marker {
        left: calc(-1 * var(--spacing-lg) - 10px);
        width: 24px;
        height: 24px;
        font-size: 0.625rem;
    }

    table {
        font-size: 0.875rem;
    }

    th, td {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .contact-form-container {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--spacing-xl) 0;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .btn {
        width: 100%;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .main-nav,
    .hero-ctas,
    .section-cta,
    .contact-form-container,
    .video-container,
    .site-footer {
        display: none;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    h1, h2, h3 {
        page-break-after: avoid;
    }

    .section {
        padding: 1rem 0;
    }
}