:root {
    --primary-color: #4a6bff;
    --secondary-color: #f8f9fa;
    --accent-color: #ff6b6b;
    --text-color: #333;
    --light-text: #6c757d;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-image: url("../images/bg.webp");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 600px;
    margin: 30px auto;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.container:hover {
    transform: translateY(-5px);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 25px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
    position: relative;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 1.1em;
    background: linear-gradient(45deg, #0949fb, #ea40c2, #16d67d, #3399ff, #ae2cda);
    background-size: 400% 400%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

input,
select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s;
}

input:focus,
select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 107, 255, 0.2);
}

input[type="submit"] {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 10px;
}

input[type="submit"]:hover {
    background-color: #3a5bef;
}

.required::after {
    content: " *";
    color: var(--accent-color);
}

.message {
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    text-align: center;
    display: none;
}

.error-message {
    background-color: #f8d7da;
    color: #721c24;
    display: none;
}

.success-message {
    background-color: #d4edda;
    color: #155724;
    display: none;
}

.form-footer {
    text-align: center;
    margin-top: 20px;
    color: var(--light-text);
    font-size: 14px;
}

.class-selection {
    display: flex;
    gap: 10px;
}

.class-selection select {
    flex: 1;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin: 20px;
    }

    .class-selection {
        flex-direction: column;
    }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}