/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Medical Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #059669;
    --accent-color: #dc2626;
    --neutral-50: #f8fafc;
    --neutral-100: #f1f5f9;
    --neutral-200: #e2e8f0;
    --neutral-300: #cbd5e1;
    --neutral-400: #94a3b8;
    --neutral-500: #64748b;
    --neutral-600: #475569;
    --neutral-700: #334155;
    --neutral-800: #1e293b;
    --neutral-900: #0f172a;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--neutral-800);
    background-color: var(--neutral-50);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

h1 {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    line-height: 1.5;
    min-height: 44px;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-full {
    width: 100%;
}

.btn-loader {
    margin-left: var(--spacing-sm);
}

/* Header */
.header {
    background-color: white;
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav {
    padding: var(--spacing-md) 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
}

.nav-brand i {
    margin-right: var(--spacing-sm);
    font-size: 1.75rem;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    text-decoration: none;
    color: var(--neutral-700);
    font-weight: var(--font-weight-medium);
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--neutral-700);
}

/* Hero Section */
.hero {
    padding: 120px 0 var(--spacing-3xl);
    background: linear-gradient(135deg, var(--neutral-50) 0%, var(--neutral-100) 100%);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--neutral-900);
    margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--neutral-600);
    margin-bottom: var(--spacing-2xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.trust-indicators {
    display: flex;
    gap: var(--spacing-xl);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--neutral-600);
    font-weight: var(--font-weight-medium);
}

.trust-item i {
    color: var(--secondary-color);
    font-size: 1.25rem;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.hero-image img {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

/* About Section */
.about {
    padding: var(--spacing-3xl) 0;
    background-color: white;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-lg);
}

.section-header p {
    font-size: 1.25rem;
    color: var(--neutral-600);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-3xl);
}

.feature-card {
    background-color: var(--neutral-50);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.feature-icon i {
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.5rem;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    color: var(--neutral-600);
    line-height: 1.7;
}

/* Testimonials */
.testimonials {
    margin-top: var(--spacing-3xl);
}

.testimonials h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-2xl);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.testimonial-card {
    background-color: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.testimonial-image {
    margin-bottom: var(--spacing-lg);
}

.testimonial-image img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--neutral-200);
}

.testimonial-content p {
    font-style: italic;
    color: var(--neutral-600);
    margin-bottom: var(--spacing-lg);
}

.testimonial-rating {
    color: #fbbf24;
}

/* Register Section */
.register {
    padding: var(--spacing-3xl) 0;
    background-color: var(--neutral-50);
}

.register-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: start;
    margin-bottom: var(--spacing-3xl);
}

.register-content h2 {
    font-size: 2.5rem;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-lg);
}

.register-content p {
    font-size: 1.125rem;
    color: var(--neutral-600);
    margin-bottom: var(--spacing-2xl);
}

.medical-professionals {
    margin-top: var(--spacing-2xl);
}

.medical-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.medical-grid img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* Form Styles */
.register-form {
    background-color: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

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

.form-group label {
    font-weight: var(--font-weight-medium);
    color: var(--neutral-700);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select {
    padding: var(--spacing-md);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    background-color: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input.error,
.form-group select.error {
    border-color: var(--accent-color);
}

.error-message {
    color: var(--accent-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: block;
}

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

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
    line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--neutral-300);
    border-radius: var(--radius-sm);
    position: relative;
    background-color: white;
    flex-shrink: 0;
    margin-top: 2px;
}

.checkbox-label input[type="checkbox"]:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.form-footer {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.form-footer p {
    color: var(--neutral-600);
    font-size: 0.875rem;
}

.form-footer i {
    color: var(--secondary-color);
    margin-right: var(--spacing-xs);
}

.link {
    color: var(--primary-color);
    text-decoration: none;
}

.link:hover {
    text-decoration: underline;
}

/* Testing Kit Showcase */
.testing-kit-showcase {
    background-color: white;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.testing-kit-showcase h3 {
    text-align: center;
    font-size: 1.75rem;
    margin-bottom: var(--spacing-2xl);
    color: var(--neutral-900);
}

.kit-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.kit-grid img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.kit-features {
    list-style: none;
}

.kit-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    color: var(--neutral-700);
}

.kit-features i {
    color: var(--secondary-color);
    font-size: 1.125rem;
}

/* Contact Section */
.contact {
    padding: var(--spacing-3xl) 0;
    background-color: white;
}

.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.contact-content h2 {
    font-size: 2.5rem;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-lg);
}

.contact-content p {
    font-size: 1.125rem;
    color: var(--neutral-600);
    margin-bottom: var(--spacing-2xl);
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.contact-item i {
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.contact-item h4 {
    font-size: 1.125rem;
    color: var(--neutral-900);
    margin-bottom: var(--spacing-xs);
}

.contact-item p {
    color: var(--neutral-600);
    margin: 0;
}

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

/* Footer */
.footer {
    background-color: var(--neutral-900);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
}

.footer-brand i {
    margin-right: var(--spacing-sm);
    font-size: 1.75rem;
}

.footer-section p {
    color: var(--neutral-300);
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul li a {
    color: var(--neutral-300);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid var(--neutral-700);
    padding-top: var(--spacing-xl);
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-bottom p {
    color: var(--neutral-400);
    margin: 0;
}

.footer-bottom a {
    color: var(--primary-color);
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: white;
    margin: 10% auto;
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-xl);
}

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

.modal-header i {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
}

.modal-header h3 {
    font-size: 1.75rem;
    color: var(--neutral-900);
    margin: 0;
}

.modal-body {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.modal-body p {
    color: var(--neutral-600);
    line-height: 1.7;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .trust-indicators {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .register-container {
        grid-template-columns: 1fr;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .kit-grid {
        grid-template-columns: 1fr;
    }
    
    .medical-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero {
        padding: 100px 0 var(--spacing-2xl);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .register-content h2,
    .contact-content h2 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .register-form,
    .testing-kit-showcase {
        padding: var(--spacing-lg);
    }
}

/* Animation for form submission */
@keyframes pulse {
    0% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 1;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus styles for accessibility */
.btn:focus,
input:focus,
select:focus,
a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --neutral-600: #000000;
        --neutral-700: #000000;
        --neutral-800: #000000;
        --neutral-900: #000000;
    }
}



/* Testimonial Avatar Styles */
.testimonial-avatar {
    width: 80px;
    height: 80px;
    background-color: var(--neutral-200);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.testimonial-avatar i {
    font-size: 2rem;
    color: var(--neutral-500);
}