/* Variables para colores y fuentes */
:root {
    --color-primary: #3498db; /* Azul moderno */
    --color-secondary: #2c3e50; /* Gris oscuro para fondo */
    --color-text: #333;
    --color-light: #f5f5f5;
    --color-accent: #e74c3c; /* Rojo para botones de acción */
    --font-family: 'Poppins', sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-light);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- Botones --- */
.btn {
    display: inline-block;
    padding: 10px 25px;
    margin: 5px 10px 5px 0;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: background-color 0.3s, transform 0.2s;
}

.primary-btn {
    background-color: var(--color-primary);
    color: white;
}
.primary-btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

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

.app-store-btn {
    background-color: #4CAF50; /* Verde Play Store */
    color: white;
}
.app-store-btn:hover {
    background-color: #388E3C;
}

/* --- HEADER / HERO --- */
.hero {
    background-color: var(--color-secondary);
    color: var(--color-light);
    padding: 100px 0;
    text-align: center;
}

.hero h1 {
    font-size: 3em;
    margin-bottom: 10px;
}
.hero .tagline {
    font-size: 1.5em;
    font-weight: 300;
    margin-bottom: 30px;
}

/* --- SECCIONES GENERALES --- */
.section {
    padding: 80px 0;
    text-align: center;
}
.section:nth-child(even) { /* Color de fondo alternado */
    background-color: white;
}

.section h2 {
    font-size: 2em;
    margin-bottom: 40px;
}

/* --- HABILIDADES --- */
.skill-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
}
.skill-list span {
    background-color: var(--color-primary);
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9em;
}

/* --- PROYECTOS --- */
.project-card {
    display: flex;
    align-items: center;
    text-align: left;
    gap: 40px;
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 40px;
}

.project-card:nth-child(odd) {
    flex-direction: row-reverse; /* Alternar el diseño */
}

.project-details {
    flex: 2;
}
.project-image {
    flex: 1;
    min-width: 200px;
    height: 200px;
    background-color: var(--color-light); /* Color para simular la imagen */
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--color-text);
}

.project-details h3 {
    color: var(--color-primary);
    margin-bottom: 10px;
}
.project-desc {
    margin-bottom: 15px;
}

/* --- FOOTER --- */
.footer {
    background-color: var(--color-secondary);
    color: var(--color-light);
    padding: 40px 0;
    text-align: center;
}
.footer p {
    margin-bottom: 10px;
}
.social-links a {
    color: var(--color-light);
    text-decoration: none;
    margin: 0 10px;
    transition: color 0.3s;
}
.social-links a:hover {
    color: var(--color-primary);
}

/* RESPONSIVE: Adaptación para móviles */
@media (max-width: 768px) {
    .hero {
        padding: 80px 20px;
    }
    .hero h1 {
        font-size: 2.5em;
    }
    
    .project-card {
        flex-direction: column; /* Apilar en móviles */
        text-align: center;
    }
    .project-card:nth-child(odd) {
        flex-direction: column; /* Asegurar que se apile también */
    }
    .project-image {
        order: -1; /* Mover la imagen arriba en móviles */
        margin-bottom: 20px;
    }
    .project-links {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
}