/* ================================
   Design System Variables
   ================================ */
:root {
    /* Colors - Field to Evidence Palette */
    --primary-teal: #0D7377;
    --primary-teal-light: #14919B;
    --primary-teal-dark: #094B4E;
    --accent-terracotta: #C4785F;
    --accent-terracotta-light: #D9967E;
    --accent-terracotta-dark: #A05945;

    /* Neutrals - Improved contrast */
    --charcoal: #2B2D42;
    --charcoal-light: #4A4D6A;
    --gray-dark: #4A4E63;
    --gray-medium: #6B7280;
    --gray-light: #E5E7EB;
    --off-white: #F8F9FA;
    --white: #FFFFFF;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Merriweather', Georgia, serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Layout */
    --container-width: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;

    /* Focus */
    --focus-ring: 0 0 0 3px rgba(13, 115, 119, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--charcoal);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* Focus styles for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-teal);
    outline-offset: 2px;
    box-shadow: var(--focus-ring);
}

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

/* ================================
   Typography
   ================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--charcoal);
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    font-weight: 600;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--charcoal-light);
}

.lead {
    font-size: 1.25rem;
    font-weight: 400;
    line-height: 1.7;
    color: var(--gray-dark);
}

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

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--charcoal);
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--gray-dark);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
}

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

/* ================================
   Navigation
   ================================ */
.nav-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-teal);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    color: var(--charcoal-light);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-teal);
    background-color: rgba(13, 115, 119, 0.05);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--charcoal);
    transition: var(--transition);
}

/* ================================
   Main Banner Section
   ================================ */
.main-banner {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-teal-dark) 0%, var(--primary-teal) 100%);
    margin-top: 72px;
    overflow: hidden;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(13, 115, 119, 0.6) 0%, rgba(9, 75, 78, 0.5) 100%);
    z-index: 1;
}

.banner-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    padding: var(--spacing-xl) var(--spacing-md);
}

.banner-title {
    font-size: 4rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.banner-subtitle {
    font-size: 1.35rem;
    color: rgba(255, 255, 255, 0.95);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    line-height: 1.7;
}

.banner-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.banner-background-image {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-color: var(--primary-teal-dark);
    z-index: 0;
    opacity: 0.7;
}

/* ================================
   Buttons
   ================================ */
.btn {
    display: inline-block;
    padding: 0.9rem 2rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-teal-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 115, 119, 0.3);
}

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

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

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

.btn-primary-inverted:hover {
    background-color: var(--off-white);
    transform: translateY(-2px);
}

.btn-text {
    color: var(--primary-teal);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-text:hover {
    color: var(--primary-teal-dark);
    gap: 0.75rem;
}

/* ================================
   Impact Stats Section
   ================================ */
.impact-stats {
    background-color: var(--white);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--gray-light);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    text-align: center;
}

.stat-item {
    padding: var(--spacing-md);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-teal);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1rem;
    color: var(--gray-dark);
    font-weight: 500;
}

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

.section-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.content-text h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--charcoal);
}

.content-image {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.image-placeholder {
    aspect-ratio: 4/3;
    background: var(--gray-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-medium);
    border-radius: var(--border-radius);
}

/* ================================
   Featured Section
   ================================ */
.featured-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--white);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.featured-card {
    background: var(--white);
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    transition: var(--transition);
}

.featured-card:hover {
    border-color: var(--primary-teal);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.featured-year {
    display: inline-block;
    background-color: var(--primary-teal);
    color: var(--white);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
}

.featured-type {
    color: var(--primary-teal) !important;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs) !important;
}

.featured-description {
    color: var(--gray-dark);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.featured-link {
    color: var(--primary-teal);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    transition: var(--transition);
}

.featured-link:hover {
    color: var(--primary-teal-dark);
    transform: translateX(4px);
}

.card-tag {
    display: inline-block;
    background-color: rgba(13, 115, 119, 0.1);
    color: var(--primary-teal);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
}

.featured-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--charcoal);
}

.featured-card p {
    color: var(--gray-dark);
    margin-bottom: var(--spacing-md);
}

.card-link {
    color: var(--primary-teal);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.card-link:hover {
    color: var(--primary-teal-dark);
    gap: 0.75rem;
}

/* ================================
   Projects Preview
   ================================ */
.projects-preview {
    padding: var(--spacing-xl) 0;
    background-color: var(--off-white);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.project-card {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}

.project-image {
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.project-image .image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-teal-light), var(--accent-terracotta-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.project-content {
    padding: var(--spacing-md);
}

.project-location {
    display: inline-block;
    color: var(--accent-terracotta);
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.project-content h3 {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-sm);
}

.project-content p {
    color: var(--gray-dark);
    margin-bottom: var(--spacing-md);
}

/* ================================
   CTA Section
   ================================ */
.cta-section {
    background: linear-gradient(135deg, var(--primary-teal) 0%, var(--primary-teal-dark) 100%);
    color: var(--white);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.cta-section h2 {
    color: var(--white);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.cta-section p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-md);
}

/* ================================
   Footer
   ================================ */
.footer {
    background-color: var(--charcoal);
    color: var(--gray-light);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-section h3 {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: var(--gray-light);
    font-size: 0.95rem;
}

.footer-tagline {
    margin-top: var(--spacing-sm);
    font-style: italic;
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: var(--gray-light);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-teal-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--charcoal-light);
}

.footer-bottom p {
    color: var(--gray-medium);
    font-size: 0.9rem;
}

/* ================================
   Accessibility Utilities
   ================================ */
.skip-to-content {
    position: absolute;
    top: -100px;
    left: 0;
    background: var(--primary-teal);
    color: var(--white);
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    font-weight: 600;
    z-index: 10000;
    border-radius: 0 0 var(--border-radius) 0;
}

.skip-to-content:focus {
    top: 0;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ================================
   Back to Top Button
   ================================ */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--primary-teal);
    color: var(--white);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    font-size: 1.5rem;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-teal-dark);
    transform: translateY(-4px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* ================================
   Animation Utilities
   ================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.fade-in-element {
    opacity: 0;
    animation: fadeInUp 0.6s ease-out forwards;
}

.fade-in-element.fade-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* Stagger animation delays for multiple elements */
.fade-in-element:nth-child(1) { animation-delay: 0.1s; }
.fade-in-element:nth-child(2) { animation-delay: 0.2s; }
.fade-in-element:nth-child(3) { animation-delay: 0.3s; }
.fade-in-element:nth-child(4) { animation-delay: 0.4s; }
.fade-in-element:nth-child(5) { animation-delay: 0.5s; }

/* ================================
   External Link Indicator
   ================================ */
a[target="_blank"]::after {
    content: " ↗";
    font-size: 0.85em;
    vertical-align: super;
    margin-left: 0.15em;
}

a[target="_blank"].no-icon::after {
    content: "";
}

/* ================================
   Utility Classes
   ================================ */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.placeholder-content {
    text-align: center;
    padding: 3rem 2rem;
    background: white;
    border-radius: var(--border-radius);
    margin: 2rem 0;
}

.placeholder-content p {
    color: var(--gray-dark);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.text-link {
    color: var(--primary-teal);
    font-weight: 600;
    text-decoration: underline;
}

.text-link:hover {
    color: var(--primary-teal-dark);
}

/* ================================
   Contact Form
   ================================ */
.contact-form {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--charcoal);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.required {
    color: var(--accent-terracotta);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: 1rem;
    color: var(--charcoal);
    transition: var(--transition);
    background-color: var(--white);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-teal);
    box-shadow: 0 0 0 3px rgba(13, 115, 119, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form button[type="submit"] {
    width: 100%;
}

@media (min-width: 768px) {
    .contact-form button[type="submit"] {
        width: auto;
        min-width: 200px;
    }
}

.contact-note {
    background: var(--off-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-terracotta);
}

.contact-note p {
    margin-bottom: var(--spacing-sm);
    color: var(--gray-dark);
}

.contact-note ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-md);
}

.contact-note li {
    margin-bottom: 0.5rem;
    color: var(--gray-dark);
}

.contact-note code {
    background: var(--white);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
    color: var(--primary-teal);
}

/* Contact Page - Simple Version */
.contact-info-box {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    text-align: center;
}

.contact-info-box h2 {
    color: var(--charcoal);
    margin-bottom: var(--spacing-sm);
}

.contact-info-box .lead {
    font-size: 1.1rem;
    color: var(--gray-dark);
    margin-bottom: var(--spacing-lg);
}

.contact-method {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) 0;
    border-top: 2px solid var(--gray-light);
}

.contact-method:first-of-type {
    border-top: none;
}

.contact-method h3 {
    color: var(--primary-teal);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

.contact-email {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-teal);
    text-decoration: none;
    transition: var(--transition);
}

.contact-email:hover {
    color: var(--primary-teal-dark);
    text-decoration: underline;
}

.interest-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) auto;
    max-width: 500px;
    text-align: left;
}

.interest-list li {
    padding: 0.75rem 0;
    color: var(--gray-dark);
    border-bottom: 1px solid var(--gray-light);
    padding-left: 1.5rem;
    position: relative;
}

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

.interest-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-terracotta);
    font-weight: bold;
}

.response-note {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 2px solid var(--gray-light);
    color: var(--gray-medium);
    font-style: italic;
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .main-banner {
        min-height: 70vh;
    }

    .banner-title {
        font-size: 2.5rem;
    }

    .banner-subtitle {
        font-size: 1.1rem;
    }

    .banner-buttons {
        flex-direction: column;
    }

    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 44px;
        height: 44px;
    }
    
    .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        z-index: 999;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .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, -7px);
    }
    
    .section-content {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .featured-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .banner-title {
        font-size: 2rem;
    }

    .banner-subtitle {
        font-size: 1rem;
    }

    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 0.95rem;
    }

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