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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* Navigation Header */
.main-header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.nav-logo h2 {
    color: #2c3e50;
    font-weight: 700;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #3498db;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #3498db;
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    margin-top: 70px;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-content h2 {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.cta-button {
    display: inline-block;
    background: #fff;
    color: #667eea;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* About Section */
.about {
    padding: 80px 0;
    background: #fff;
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

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

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #555;
}

.skills {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.skill-tag {
    background: #3498db;
    color: white;
    padding: 8px 16px;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Blog Section */
.blog {
    padding: 80px 0;
    background: #f8f9fa;
}

.blog h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.blog-post {
    background: #fff;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.blog-post:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.post-image {
    height: 200px;
    overflow: hidden;
    background: #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.post-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    font-size: 1.2rem;
    font-weight: 600;
    color: white;
    text-align: center;
    padding: 1rem;
}

.post-image[data-image="cautiva"] {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.post-image[data-image="iot"] {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.post-image[data-image="mit"] {
    background: linear-gradient(135deg, #fd746c 0%, #ff9068 100%);
}

.post-content {
    padding: 2rem;
}

.post-content h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    color: #2c3e50;
}

.post-meta {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-style: italic;
}

.post-excerpt {
    color: #555;
    margin-bottom: 1.5rem;
}

.post-full {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #eee;
}

.post-full h4 {
    color: #2c3e50;
    margin: 1.5rem 0 0.5rem;
    font-size: 1.1rem;
}

.post-full p {
    margin-bottom: 1rem;
    color: #555;
}

.read-more-btn {
    background: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.3s ease;
}

.read-more-btn:hover {
    background: #2980b9;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background: #fff;
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.contact-item {
    text-align: center;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 10px;
    transition: transform 0.3s ease;
}

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

.contact-item h4 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.contact-item p {
    color: #555;
}

.contact-item a {
    color: #3498db;
    text-decoration: none;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* Footer */
.main-footer {
    background: #2c3e50;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-content h2 {
        font-size: 1.2rem;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .about, .blog, .contact {
        padding: 60px 0;
    }
    
    .blog-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .skills {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero {
        margin-top: 120px;
        padding: 80px 0 40px;
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .post-content {
        padding: 1.5rem;
    }
    
    .container {
        padding: 0 15px;
    }
}

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

.blog-post {
    animation: fadeInUp 0.6s ease-out;
}

.blog-post:nth-child(1) { animation-delay: 0.1s; }
.blog-post:nth-child(2) { animation-delay: 0.2s; }
.blog-post:nth-child(3) { animation-delay: 0.3s; }

/* Scroll Behavior */
html {
    scroll-behavior: smooth;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #3498db;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #2980b9;
}

/* Loading States for actual images */
.post-image.loading {
    background: linear-gradient(90deg, #f0f0f0 25%, transparent 37%, #f0f0f0 63%);
    background-size: 400% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0% {
        background-position: 100% 0;
    }
    100% {
        background-position: -100% 0;
    }
}