body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #0a0f1c;
    color: #fff;
}

header {
    text-align: center;
    padding: 40px;
    background: linear-gradient(90deg, #0f172a, #1e293b);
}

h1 {
    margin: 0;
    font-size: 2.5em;
}

.container {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 50px;
}

.card {
    background: #111827;
    padding: 30px;
    border-radius: 12px;
    width: 250px;
    text-align: center;
    transition: 0.3s;
    box-shadow: 0 0 20px rgba(0,255,255,0.1);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 0 30px rgba(0,255,255,0.3);
}

.btn {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background: #06b6d4;
    color: black;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
}

.form-container {
    max-width: 500px;
    margin: 50px auto;
    background: #111827;
    padding: 30px;
    border-radius: 12px;
}

form {
    display: flex;
    flex-direction: column;
}

input, select {
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 6px;
    border: none;
}

pre {
    margin-top: 20px;
    background: black;
    padding: 15px;
    border-radius: 8px;
    overflow: auto;
}

.resultado {
    margin-top: 20px;
}

.success {
    background: #022c22;
    border: 1px solid #10b981;
    padding: 15px;
    border-radius: 8px;
}

.error {
    background: #2c0202;
    border: 1px solid #ef4444;
    padding: 15px;
    border-radius: 8px;
}

nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    background: #020617;
    padding: 15px;
}

nav a {
    color: #06b6d4;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

.bar {
    width: 100%;
    height: 10px;
    background: #1f2937;
    border-radius: 5px;
    overflow: hidden;
    margin-top: 10px;
}

#bar-fill {
    height: 100%;
    width: 0%;
    background: #06b6d4;
    transition: width 1s;
}

code {
    display: block;
    background: #0f172a;
    padding: 10px;
    border-radius: 6px;
    margin-top: 10px;
    color: #38bdf8;
}