:root {
    --brand-cian: #00f2ff; /* Basado en el logo */
    --grey-metal: #a0a0a0; /* Estética aluminio */
    --dark-bg: #0b0b0b;
    --card-bg: #141414;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--dark-bg);
    color: #d1d1d1;
    margin: 0;
    font-size: 13px; /* Tamaño reducido para look técnico */
    line-height: 1.4;
}

header {
    background-color: #000;
    padding: 0.8rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--brand-cian);
    position: sticky; 
    top: 0; 
    z-index: 1000;
}

.logo img { 
    height: 45px; 
    width: auto; 
}

nav a {
    color: var(--grey-metal);
    text-decoration: none;
    margin-left: 15px;
    font-size: 0.7rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

nav a:hover { 
    color: var(--brand-cian); 
}

/* Hero: Ingeniería Energética Solar */
.hero {
    padding: 60px 5%;
    text-align: center;
    border-bottom: 1px solid #222;
}

.hero h1 { 
    font-size: 1.8rem; 
    margin: 0; 
    color: #fff; 
    letter-spacing: -0.5px; 
}

.hero h1 span {
    color: var(--brand-cian);
    display: block;
    font-size: 2.2rem;
    text-shadow: 0 0 15px rgba(0, 242, 255, 0.3);
    margin-top: 5px;
}

/* Los 4 Pilares de Linearsun */
.servicios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    padding: 40px 5%;
}

.card {
    background: var(--card-bg);
    padding: 20px;
    border-left: 2px solid var(--grey-metal);
}

.card h2 { 
    color: var(--brand-cian); 
    margin-top: 0; 
    font-size: 1rem; 
    text-transform: uppercase; 
}

.card p { 
    font-size: 0.8rem; 
    color: #aaa; 
    margin-bottom: 0; 
}

/* Proceso Técnico Certificado */
.proceso-tecnico {
    background-color: #000;
    padding: 50px 5%;
    text-align: center;
}

.proceso-tecnico h2 { 
    font-size: 1.3rem; 
    margin-bottom: 30px; 
    color: #fff; 
}

.steps-container { 
    display: flex; 
    flex-wrap: wrap; 
    justify-content: center; 
    gap: 10px; 
}

.step-box { 
    flex: 1; 
    min-width: 160px; 
    max-width: 220px; 
    padding: 15px; 
    border: 1px solid #222; 
}

.step-num { 
    color: var(--brand-cian); 
    font-weight: bold; 
    font-size: 1.2rem; 
    display: block; 
    margin-bottom: 5px; 
}

.step-box h3 { 
    font-size: 0.9rem; 
    margin: 5px 0; 
    color: #eee; 
}

.step-box p { 
    font-size: 0.75rem; 
    color: #888; 
}

/* Footer con datos oficiales */
footer {
    padding: 40px 5%;
    background: #000;
    text-align: center