:root {
    --background-color: #f4f7f6;
    --text-color: #333;
    --primary-color: #0a2e5c;
    --secondary-color: #0056b3;
    --surface-color: #ffffff;
    --shadow-color: rgba(0,0,0,0.1);
    --hero-overlay: rgba(10, 46, 92, 0.7);
    --hero-text-color: #ffffff;
}

[data-theme="dark"] {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #0056b3;
    --secondary-color: #03dac6;
    --surface-color: #1e1e1e;
    --shadow-color: rgba(255,255,255,0.1);
    --hero-overlay: rgba(0, 0, 0, 0.6);
    --hero-text-color: #ffffff;
}

/* Estilos Generales */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

h1, h2 {
    color: var(--primary-color);
}

/* Header y Navegación */
header {
    background-color: var(--surface-color);
    box-shadow: 0 2px 5px var(--shadow-color);
    padding: 1rem 5%;
    position: fixed;
    width: 90%;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
}

nav ul li {
    margin-left: 2rem;
}

nav ul li a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: var(--secondary-color);
}

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: 1rem;
}

/* Sección Hero */
#hero {
    position: relative;
    overflow: hidden;
    background: linear-gradient(var(--hero-overlay), var(--hero-overlay)), url('https://via.placeholder.com/1500x800.png/0a2e5c/ffffff?text=Blue+Dragonfly+Tech') no-repeat center center/cover;
    color: var(--hero-text-color);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 5%;
}

#tsparticles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    color: var(--hero-text-color);
}

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

.cta-button {
    background-color: #007bff;
    color: #ffffff;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: var(--secondary-color);
}

/* Secciones Generales */
main section {
    padding: 6rem 5%;
    text-align: center;
}

#about, #services, #contact {
    background-color: var(--surface-color);
    transition: background-color 0.3s;
}

#services {
    background-color: var(--background-color);
    transition: background-color 0.3s;
}

/* Tarjetas de Servicios */
.service-cards {
    display: flex;
    justify-content: space-around;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.card {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 8px var(--shadow-color);
    flex-basis: 30%;
    min-width: 280px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.card h3 {
    color: var(--secondary-color);
    margin-top: 0;
}

/* Formulario de Contacto */
#contact form {
    max-width: 600px;
    margin: 2rem auto 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#contact input, #contact textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: inherit;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

#contact button {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 1rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

#contact button:hover {
    background-color: var(--secondary-color);
}

/* Pie de página */
footer {
    background-color: var(--primary-color);
    color: var(--hero-text-color);
    text-align: center;
    padding: 2rem 0;
    transition: background-color 0.3s, color 0.3s;
}

.social-media {
    margin-bottom: 1rem;
}

.social-media a {
    color: var(--hero-text-color);
    margin: 0 0.5rem;
    text-decoration: none;
    font-size: 1.2rem;
}