:root {
    --primary: #2ecc71; /* Verde Koalla */
    --bg: #121212;
    --card: #1e1e1e;
    --text: #ffffff;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: sans-serif;
    margin: 0;
    text-align: center;
}

header { padding: 40px 20px; }
.logo { max-width: 150px; margin-bottom: 10px; }

.step { display: none; padding: 20px; animation: fadeIn 0.3s; }
.step.active { display: block; }

.grid-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    max-width: 500px;
    margin: 0 auto;
}

button {
    background: var(--card);
    border: 2px solid #333;
    color: white;
    padding: 20px;
    border-radius: 12px;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover { border-color: var(--primary); background: #252525; }

.grid-visual {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 400px;
    margin: 0 auto;
}

.system-card {
    background: var(--card);
    border-radius: 15px;
    overflow: hidden;
    cursor: pointer;
}

.system-card img { width: 100%; display: block; }
.system-card p { padding: 10px; margin: 0; }

.app-card {
    background: var(--card);
    margin: 20px auto;
    padding: 20px;
    border-radius: 20px;
    max-width: 400px;
    border-top: 4px solid var(--primary);
}

.app-logo { width: 80px; height: 80px; border-radius: 15px; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }