.sumbartron-form {
    background: linear-gradient(135deg, #1a1a2e 80%, #0f3460 100%);
    border: 3px solid #00ffe7;
    border-radius: 18px;
    box-shadow: 0 0 40px #00ffe7, 0 0 80px #ff004c inset, 0 0 10px #fff3;
    color: #fff;
    padding: 36px 28px;
    max-width: 420px;
    margin: 7vh auto;
    text-align: center;
    font-family: 'Orbitron', 'Roboto', sans-serif;
    position: relative;
    z-index: 10;
    animation: sumbartron-glow 2s infinite alternate;
}
@keyframes sumbartron-glow {
    0% { box-shadow: 0 0 40px #00ffe7, 0 0 80px #ff004c inset; }
    100% { box-shadow: 0 0 60px #ff004c, 0 0 120px #00ffe7 inset; }
}
.sumbartron-form h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.2em;
    letter-spacing: 2px;
    color: #00ffe7;
    text-shadow: 0 0 10px #ff004c, 0 0 20px #00ffe7;
    margin-bottom: 18px;
}
.sumbartron-form input, .sumbartron-form button {
    width: 92%;
    margin: 14px 0;
    padding: 13px;
    border-radius: 9px;
    border: none;
    font-size: 1.1em;
    background: #23234b;
    color: #fff;
    box-shadow: 0 0 8px #00ffe7 inset;
    outline: none;
    transition: box-shadow 0.3s;
}
.sumbartron-form input:focus {
    box-shadow: 0 0 16px #ff004c inset;
}
.sumbartron-form button {
    background: linear-gradient(90deg, #00ffe7, #ff004c);
    color: #111;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s, color 0.3s;
    border: 2px solid #fff;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.sumbartron-form button:hover {
    background: linear-gradient(90deg, #ff004c, #00ffe7);
    color: #fff;
}
.sumbartron-form a {
    color: #00ffe7;
    text-decoration: underline;
    font-weight: bold;
    margin: 0 6px;
    transition: color 0.2s;
}
.sumbartron-form a:hover {
    color: #ff004c;
}
.sumbartron-form .sumbartron-error {
    background: #ff004c;
    color: #fff;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-weight: bold;
    box-shadow: 0 0 10px #ff004c;
}
.sumbartron-form .sumbartron-success {
    background: #00ffe7;
    color: #111;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-weight: bold;
    box-shadow: 0 0 10px #00ffe7;
}
@media (max-width: 600px) {
    .sumbartron-form {
        max-width: 98vw;
        padding: 18px 2vw;
    }
}