/* Minimalistic Design for Eduardo M. Gutiérrez Website */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
    font-size: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: #1a1a1a;
}

h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1.5rem;
    text-align: left;
    max-width: 70ch;
}

a {
    color: #2563eb;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-bottom-color 0.2s ease;
}

a:hover {
    border-bottom-color: #2563eb;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
    min-height: auto;
}

.section:first-child {
    padding-top: 8rem;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid #e5e7eb;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a1a1a;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    font-size: 0.95rem;
    color: #6b7280;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #2563eb;
    border-bottom: none;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    text-align: center;
    padding: 8rem 0 6rem;
}

.hero h1 {
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #6b7280;
    margin-bottom: 0.5rem;
}

.hero-description {
    font-size: 1.125rem;
    color: #4b5563;
    margin: 0 auto 3rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border-radius: 6px;
    font-weight: 500;
    text-align: center;
    transition: all 0.2s ease;
    border: 2px solid transparent;
    cursor: pointer;
    text-decoration: none;
}

.btn-primary {
    background: #2563eb;
    color: white;
}

.btn-primary:hover {
    background: #1d4ed8;
    border-bottom: none;
}

.btn-secondary {
    background: transparent;
    color: #2563eb;
    border-color: #2563eb;
}

.btn-secondary:hover {
    background: #2563eb;
    color: white;
    border-bottom: none;
}

/* Profile Image */
.profile-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 2rem;
    display: block;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

/* Research Cards */
.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.research-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid #e5e7eb;
}

.research-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.research-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.research-card-content {
    padding: 1.5rem;
}

.research-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.research-card p {
    color: #6b7280;
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.contact-item {
    text-align: center;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 8px;
}

.contact-icon {
    font-size: 2rem;
    color: #2563eb;
    margin-bottom: 1rem;
}

.contact-item h4 {
    margin-bottom: 0.5rem;
    color: #1a1a1a;
}

.contact-item p {
    color: #6b7280;
    margin: 0;
}

/* Video Container */
.video-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    margin: 2rem auto;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.video-container iframe {
    width: 100%;
    height: 450px;
    border: none;
}

/* Footer */
.footer {
    background: #f8fafc;
    padding: 3rem 0;
    text-align: center;
    border-top: 1px solid #e5e7eb;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
}

.footer-link {
    color: #6b7280;
    font-size: 0.95rem;
}

.footer p {
    color: #9ca3af;
    font-size: 0.875rem;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem 2rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .section {
        padding: 3rem 0;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .video-container iframe {
        height: 250px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .nav-container {
        padding: 1rem;
    }
    
    .container {
        padding: 0 1rem;
    }
}

/* Print Styles */
@media print {
    .nav, .footer {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
        padding: 1rem 0;
    }
    
    a {
        color: #000;
        text-decoration: underline;
    }
}

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

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #0f172a;
        color: #e2e8f0;
    }
    
    .nav {
        background: rgba(15, 23, 42, 0.95);
        border-bottom-color: #334155;
    }
    
    .nav-logo {
        color: #f1f5f9;
    }
    
    .hero {
        background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    }
    
    .research-card {
        background: #1e293b;
        border-color: #334155;
    }
    
    .contact-item {
        background: #1e293b;
    }
    
    .footer {
        background: #1e293b;
        border-top-color: #334155;
    }
    
    h1, h2, h3, h4, h5, h6 {
        color: #f1f5f9;
    }
}