:root {
    --azul-escuro: #122a44;
    --dourado: #f1c40f;
    --cinza-claro: #f4f4f4;
    --branco: #ffffff;
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    background-color: var(--azul-escuro);
    color: var(--branco);
}

.container { width: 85%; margin: auto; overflow: hidden; }

header {
    background: rgba(18, 42, 68, 0.9);
    padding: 20px 0;
    position: sticky; top: 0; z-index: 100;
}

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

nav ul { display: flex; list-style: none; }

nav ul li a { color: white; text-decoration: none; margin-left: 20px; font-weight: bold; }

.logo { height: 50px; }

.hero {
    height: 80vh;
    display: flex;
    align-items: center;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(18,42,68,0.8)), url('../img/hero-bg.jpg');
    background-size: cover;
    text-align: center;
}

.highlight { color: var(--dourado); }

.btn-primary {
    background: var(--dourado);
    color: var(--azul-escuro);
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    display: inline-block;
    margin-top: 20px;
}

.grid-usinas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 50px 0;
}

.card {
    background: #1a3a5a;
    border-radius: 10px;
    overflow: hidden;
    transition: 0.3s;
}

.card:hover { transform: translateY(-10px); }

.card-img { height: 200px; background-size: cover; background-position: center; }

.card-content { padding: 20px; }

.tag {
    background: var(--dourado);
    color: var(--azul-escuro);
    padding: 3px 10px;
    font-size: 0.8rem;
    font-weight: bold;
    border-radius: 3px;
}