body {
    margin: 0;
    font-family: 'Poppins', sans-serif;
    background: url("https://images.unsplash.com/photo-1607082349566-187342175e2f") no-repeat center center/cover;
}

.overlay {
    background: rgba(0, 0, 0, 0.75);
    min-height: 100vh;
    padding: 40px;
}

.container {
    max-width: 1000px;
    margin: auto;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 0 40px rgba(255, 215, 0, 0.4);
    color: white;
}

h1 {
    text-align: center;
    color: gold;
    font-size: 32px;
}

.subtitle {
    text-align: center;
    margin-bottom: 25px;
    color: #ddd;
}

form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

input, select {
    padding: 10px;
    border-radius: 8px;
    border: none;
    outline: none;
}

input:focus, select:focus {
    box-shadow: 0 0 8px gold;
}

.checkbox {
    grid-column: span 2;
    font-size: 14px;
}

button {
    grid-column: span 2;
    padding: 12px;
    background: linear-gradient(45deg, gold, deeppink);
    border: none;
    border-radius: 30px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    transform: scale(1.05);
}

table {
    width: 100%;
    margin-top: 30px;
    border-collapse: collapse;
    background: rgba(255,255,255,0.1);
}

th {
    background: gold;
    color: black;
    padding: 10px;
}

td {
    padding: 8px;
    text-align: center;
}

tr:nth-child(even) {
    background: rgba(255,255,255,0.1);
}

.success {
    position: fixed;
    top: 20px;
    right: 20px;
    background: green;
    padding: 15px;
    border-radius: 10px;
    display: none;
    font-weight: bold;
}

.valid {
    border: 2px solid lime;
}

.invalid {
    border: 2px solid red;
}