/* Reset & Base */
:root {
    --bg-color: #FDFCF8;
    --text-color: #1A1A1A;
    --primary-color: #C8553D; /* Rust */
    --secondary-color: #004E64; /* Deep Blue */
    --surface-color: #F5F2EA;
    --accent-color: #E6AA68; /* Amber */
    --font-heading: 'Cinzel', serif;
    --font-body: 'Inter', sans-serif;
    --spacing-unit: 1rem;
    --max-width: 1200px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

ul {
    list-style: none;
}

h1, h2, h3 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-unit);
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.hidden {
    display: none;
}

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

/* Typography */
h1 {
    font-size: 2.5rem;
    color: var(--secondary-color);
}

h2 {
    font-size: 2rem;
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

p {
    margin-bottom: 1rem;
}

/* Buttons */
.cta-button {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-size: 0.9rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

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

.cta-button.secondary {
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
}

.cta-button.small {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

/* Nav */
nav {
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a:not(.cta-button) {
    font-size: 0.95rem;
    color: var(--text-color);
}

/* Hero */
#hero {
    padding: 6rem 2rem;
    text-align: center;
    background: linear-gradient(to bottom, var(--bg-color), var(--surface-color));
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.eyebrow {
    display: block;
    font-family: var(--font-heading);
    color: var(--primary-color);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.tagline {
    font-size: 1.25rem;
    color: #555;
    margin-bottom: 2.5rem;
}

.cta-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Sections */
section {
    padding: 5rem 0;
}

section:nth-child(even) {
    background-color: var(--surface-color);
}

/* Vision */
.vision-content {
    max-width: 800px;
    font-size: 1.2rem;
}

.definition {
    border-left: 4px solid var(--secondary-color);
    padding-left: 1.5rem;
    font-style: italic;
    margin-bottom: 2rem;
}

/* Summit */
.summit-date {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 3rem;
    margin-top: -1.5rem;
}

.summit-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

/* Lab Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: white;
    padding: 2rem;
    border: 1px solid rgba(0,0,0,0.05);
    box-shadow: 0 4px 6px rgba(0,0,0,0.02);
    transition: transform 0.2s ease;
}

.card:hover {
    transform: translateY(-5px);
}

.card h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.card-link {
    color: var(--secondary-color);
    font-size: 0.9rem;
    font-weight: 600;
}

.card-link:hover {
    color: var(--primary-color);
    opacity: 1;
}

/* People */
.section-intro {
    font-size: 1.2rem;
    color: #555;
    margin-bottom: 2.5rem;
    text-align: center;
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.person {
    background: white;
    padding: 1.5rem;
    border-left: 3px solid var(--secondary-color);
    position: relative;
}

.person.human {
    border-left-color: var(--accent-color);
    background: linear-gradient(to right, rgba(230, 170, 104, 0.05), white);
}

.person.ai {
    border-left-color: var(--secondary-color);
    background: linear-gradient(to right, rgba(0, 78, 100, 0.05), white);
}

.person .badge {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    margin-bottom: 0.75rem;
}

.person.human .badge {
    background: var(--accent-color);
    color: white;
}

.person.ai .badge {
    background: var(--secondary-color);
    color: white;
}

.person h3 {
    margin-bottom: 0.25rem;
    font-size: 1.1rem;
}

.person .role {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #777;
    margin-bottom: 0.75rem;
}

.person p:last-child {
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Updates Form */
.form-container {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    background: var(--secondary-color);
    color: white;
    padding: 3rem;
    border-radius: 8px;
}

.form-container h2 {
    color: white;
    border-bottom-color: var(--accent-color);
}

.form-group {
    margin: 2rem 0;
}

input[type="email"] {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 4px;
    font-family: var(--font-body);
    font-size: 1rem;
}

/* Footer */
footer {
    background-color: var(--text-color);
    color: rgba(255,255,255,0.6);
    padding: 3rem 0;
    text-align: center;
    font-size: 0.9rem;
}

.footer-tagline {
    font-family: var(--font-heading);
    color: var(--accent-color);
    margin-top: 0.5rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .summit-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .cta-group {
        flex-direction: column;
    }
    
    .form-container {
        padding: 2rem 1rem;
    }
}