:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --background-color: #f8fafc;
    --text-color: #1e293b;
    --card-background: #ffffff;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* Header and Navigation */
header {
    background-color: var(--card-background);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Projects Section */
.projects {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    margin-top: 4rem;
}

.projects-intro {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 2rem;
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.8;
    font-style: italic;
}

.projects h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2rem;
    color: var(--primary-color);
}

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

.project-card {
    background: var(--card-background);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
}

.project-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

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

.project-card p {
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 1.5rem;
}

/* Social Section */
.social {
    padding: 5rem 2rem;
    text-align: center;
    background-color: #f0f9ff;
}

.social h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.social p {
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    background-color: var(--card-background);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
    color: var(--primary-color);
}

.social-link i {
    font-size: 1.5rem;
}

.social-link span {
    font-weight: 500;
}

/* Footer */
footer {
    background-color: var(--text-color);
    color: white;
    text-align: center;
    padding: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

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

    .social-links {
        gap: 1rem;
    }

    .social-link {
        padding: 0.5rem 1rem;
    }

    .social-link i {
        font-size: 1.25rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card, .social {
    animation: fadeIn 1s ease-out;
}

/* The Void Card Styles */
.void-card {
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    color: white;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.void-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(138, 43, 226, 0.3);
}

.void-card h3 {
    color: #e0e0e0;
    text-shadow: 0 0 10px rgba(138, 43, 226, 0.5);
}

.void-card p {
    color: #b0b0b0;
}

.void-icon {
    color: #8a2be2 !important;
    text-shadow: 0 0 15px rgba(138, 43, 226, 0.7);
}

.stars-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.star {
    position: absolute;
    background: white;
    border-radius: 50%;
    animation: twinkle 3s infinite;
}

.star1 {
    width: 2px;
    height: 2px;
    top: 20%;
    left: 15%;
    animation-delay: 0s;
}

.star2 {
    width: 1px;
    height: 1px;
    top: 35%;
    right: 20%;
    animation-delay: 0.5s;
}

.star3 {
    width: 3px;
    height: 3px;
    bottom: 30%;
    left: 25%;
    animation-delay: 1s;
}

.star4 {
    width: 1.5px;
    height: 1.5px;
    bottom: 20%;
    right: 15%;
    animation-delay: 1.5s;
}

.star5 {
    width: 2px;
    height: 2px;
    top: 60%;
    left: 50%;
    animation-delay: 2s;
}

@keyframes twinkle {
    0%, 100% {
        opacity: 0.3;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.2);
    }
}

/* Renfe Train Tracker Card Styles */
.renfe-card {
    background: linear-gradient(135deg, #d32f2f 0%, #e64a19 50%, #ff6f00 100%);
    color: white;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.renfe-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(211, 47, 47, 0.4);
}

.renfe-card h3 {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.renfe-card p {
    color: #ffe0b2;
}

.renfe-icon {
    color: #ffffff !important;
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.5);
}

.tracks-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 30%;
    pointer-events: none;
    overflow: hidden;
}

.track {
    position: absolute;
    height: 2px;
    background: rgba(255, 255, 255, 0.4);
    left: 0;
    width: 100%;
}

.track1 {
    bottom: 15px;
    animation: trackMove 2s linear infinite;
}

.track2 {
    bottom: 10px;
    animation: trackMove 2s linear infinite 0.1s;
}

.track-line {
    position: absolute;
    bottom: 12px;
    left: 0;
    width: 100%;
    height: 1px;
    background: repeating-linear-gradient(
        to right,
        rgba(255, 255, 255, 0.6) 0,
        rgba(255, 255, 255, 0.6) 10px,
        transparent 10px,
        transparent 20px
    );
    animation: trackMove 2s linear infinite;
}

.moving-train {
    position: absolute;
    bottom: 8px;
    left: -30px;
    animation: trainMove 4s linear infinite;
    pointer-events: none;
}

.train-icon-small {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    filter: drop-shadow(0 0 3px rgba(255, 255, 255, 0.5));
}

@keyframes trackMove {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-20px);
    }
}

@keyframes trainMove {
    0% {
        left: -30px;
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        left: calc(100% + 30px);
        opacity: 0;
    }
}