/* Lung Research Florida - Main CSS
   Advanced Medical Website Styling - 2025 */

/* CSS Variables for Brand Colors */
:root {
    --primary-color: #0066cc;
    --primary-dark: #004499;
    --secondary-color: #f5a742;
    --accent-color: #e74c3c;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --background-white: #ffffff;
    --background-light: #f8f9fa;
    --border-light: #e9ecef;
    --shadow-light: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 20px rgba(0,0,0,0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

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

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--background-white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    left: -9999px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
}

.skip-link:focus {
    left: 20px;
    top: 20px;
    z-index: 999;
}

/* Header Styles */
.main-header {
    background: var(--background-white);
    box-shadow: var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.clinic-logo {
    height: 60px;
    width: auto;
}

.clinic-info h1 {
    color: var(--primary-color);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    line-height: 1.2;
}

.clinic-subtitle {
    color: var(--text-light);
    font-size: 0.95rem;
    font-weight: 500;
}

.header-contact {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: right;
}

.contact-item {
    font-size: 0.9rem;
}

.contact-item strong {
    color: var(--text-dark);
    margin-right: 0.5rem;
}

.phone-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

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

/* Navigation Styles - FIXED TO BE STICKY */
.main-navigation {
    background: var(--primary-color);
    box-shadow: var(--shadow-light);
    position: sticky;
    top: 100px; /* Position below the header */
    z-index: 99;
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    margin: 0;
}

.nav-link {
    display: block;
    padding: 1rem 1.5rem;
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border-bottom: 3px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255,255,255,0.1);
    border-bottom-color: var(--secondary-color);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: auto;
    z-index: 1001;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: white;
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    line-height: 1.5;
}

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

.btn-primary:hover {
    background: #0052a3;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.btn-secondary:hover {
    background: #e09629;
    transform: translateY(-2px);
}

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

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

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #004499 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.page-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.page-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 800px;
    margin: 0 auto;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--background-light) 0%, var(--background-white) 100%);
    padding: 4rem 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    line-height: 1.3;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-benefits {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.benefit-icon {
    font-size: 1.5rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

/* News Banner */
.research-news {
    background: var(--primary-color);
    color: white;
    padding: 1.5rem 0;
}

.news-banner {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.news-icon {
    font-size: 2rem;
}

.news-content h3 {
    color: white;
    margin-bottom: 0.5rem;
}

.news-content p {
    opacity: 0.9;
}

/* Quick Actions */
.quick-actions {
    padding: 4rem 0;
    background: var(--background-light);
}

.action-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.action-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.action-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.action-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 700;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto;
}

/* Featured Trials */
.featured-trials {
    padding: 4rem 0;
}

.trials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.trial-card {
    background: white;
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

.trial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.trial-status {
    background: var(--secondary-color);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: inline-block;
    border-radius: 20px;
}

.trial-status.enrolling {
    background: #27ae60;
}

.trial-content {
    padding: 1.5rem;
}

.trial-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
    font-weight: 600;
}

.trial-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.trial-details {
    margin-bottom: 1.5rem;
}

.detail-item {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.detail-item strong {
    color: var(--text-dark);
}

.trials-cta {
    text-align: center;
    margin-top: 3rem;
}

/* Research Areas */
.research-areas {
    padding: 4rem 0;
    background: var(--background-light);
}

.areas-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.area-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.area-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 1rem;
}

.area-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.focus-list {
    list-style: none;
    margin: 1rem 0;
}

.focus-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.focus-list li::before {
    content: "•";
    color: var(--secondary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.learn-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.learn-more:hover {
    text-decoration: underline;
}

/* Innovation Spotlight */
.innovation-spotlight {
    padding: 4rem 0;
}

.innovation-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.innovation-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    position: relative;
}

.innovation-badge {
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    position: absolute;
    top: -10px;
    right: 20px;
}

.innovation-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    margin-top: 1rem;
}

/* Benefits Grid */
.participation-benefits {
    padding: 4rem 0;
    background: var(--background-light);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.benefit-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-light);
}

.benefit-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.benefit-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* About Doctor */
.about-doctor {
    padding: 4rem 0;
}

.doctor-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.doctor-info h2 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 2rem;
}

.doctor-info h3 {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.credentials {
    margin: 2rem 0;
}

.credentials h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.credentials ul {
    list-style: none;
    padding: 0;
}

.credentials li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.credentials li::before {
    content: "✓";
    color: var(--secondary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

.doctor-photo {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
}

/* Contact CTA */
.contact-cta {
    padding: 4rem 0;
    background: var(--primary-color);
    color: white;
}

.cta-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 2rem;
}

.cta-text h2 {
    color: white;
    margin-bottom: 1rem;
}

.cta-actions {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-option h3 {
    color: white;
    margin-bottom: 0.5rem;
}

.location-info {
    text-align: center;
}

.location-info h3 {
    color: white;
    margin-bottom: 1rem;
}

/* Footer */
.main-footer {
    background: var(--text-dark);
    color: white;
    padding: 3rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: white;
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
}

.footer-section ul li a:hover {
    color: white;
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.2);
    color: rgba(255,255,255,0.7);
}

.footer-bottom a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
}

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

/* Enhanced Sticky Navigation with Scroll Effect */
@media (min-width: 993px) {
    .main-navigation.scrolled {
        top: 80px; /* Adjust based on header height */
        box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
}

/* Responsive Design - Mobile First Approach */
@media (max-width: 992px) {
    /* Reset sticky navigation for mobile */
    .main-navigation {
        position: relative;
        top: auto;
        z-index: 1000;
    }
    
    /* Navigation Mobile Styles */
    .main-navigation .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.5rem 20px;
    }
    
    .mobile-menu-toggle {
        display: flex;
        position: relative;
        z-index: 1001;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--primary-color);
        flex-direction: column;
        box-shadow: -2px 0 5px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        z-index: 1000;
        overflow-y: auto;
        padding-top: 60px;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        padding: 1rem 1.5rem;
        border-bottom: 1px solid rgba(255,255,255,0.1);
        border-left: 3px solid transparent;
    }
    
    .nav-link:hover,
    .nav-link.active {
        background: rgba(255,255,255,0.1);
        border-left-color: var(--secondary-color);
        border-bottom-color: rgba(255,255,255,0.1);
    }
    
    /* Mobile menu overlay */
    .nav-menu.active::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 280px;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: -1;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .logo-section {
        flex-direction: column;
    }
    
    .clinic-info h1 {
        font-size: 1.8rem;
    }
    
    .clinic-subtitle {
        font-size: 0.85rem;
    }
    
    .header-contact {
        text-align: center;
        flex-direction: row;
        justify-content: center;
        gap: 1rem;
    }
    
    .contact-item {
        font-size: 0.8rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .page-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .news-banner {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .action-cards {
        grid-template-columns: 1fr;
    }
    
    .trials-grid {
        grid-template-columns: 1fr;
    }
    
    .areas-grid {
        grid-template-columns: 1fr;
    }
    
    .innovation-grid {
        grid-template-columns: 1fr;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .doctor-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .cta-content {
        grid-template-columns: 1fr;
    }
    
    .cta-actions {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-cta {
        justify-content: center;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-cta .btn {
        width: 100%;
        max-width: 300px;
    }
}

/* Mobile menu hamburger specific styles */
@media (max-width: 480px) {
    .clinic-info h1 {
        font-size: 1.5rem;
    }
    
    .clinic-subtitle {
        font-size: 0.75rem;
        line-height: 1.2;
    }
    
    .clinic-logo {
        height: 45px;
    }
    
    .header-contact {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .nav-menu {
        width: 100%;
        right: -100%;
    }
    
    .nav-menu.active::before {
        display: none;
    }
}