.theta-container {
    max-width: 600px;
    margin: 0 auto;
    font-family: sans-serif;
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}
.theta-container h2 {
    font-size: 1.2rem;
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}
.category-block {
    margin-bottom: 25px;
}
.category-block h3 {
    font-size: 1.1rem;
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 5px;
    margin-bottom: 15px;
    color: #555;
}
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.checkbox-label {
    display: flex;
    align-items: center;
    background: #f9f9f9;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s;
    border: 1px solid #eee;
}
.checkbox-label:hover {
    background: #f0f8ff;
}
.checkbox-label input {
    margin-right: 15px;
    width: 20px;
    height: 20px;
}
.checkbox-text {
    font-size: 1rem;
    color: #444;
}
.submit-wrap {
    text-align: center;
    margin-top: 30px;
}
.btn-primary {
    background: #3498db;
    color: #fff;
    border: none;
    padding: 15px 40px;
    font-size: 1.1rem;
    border-radius: 30px;
    cursor: pointer;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(52, 152, 219, 0.3);
    transition: 0.3s;
}
.btn-primary:disabled {
    background: #ccc;
    box-shadow: none;
    cursor: not-allowed;
}
.btn-primary:hover:not(:disabled) {
    background: #2980b9;
}
#step-loading {
    text-align: center;
    padding: 50px 0;
}
.loader {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.result-message {
    background: #f4fafe;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 30px;
    color: #333;
    border: 1px solid #bce0fd;
}
.line-btn-wrap {
    text-align: center;
    margin-bottom: 20px;
}
.btn-line {
    display: inline-block;
    background: #06C755;
    color: #fff;
    text-decoration: none;
    padding: 15px 30px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(6, 199, 85, 0.3);
}
.btn-line:hover {
    background: #05b04a;
    color: #fff;
}
.btn-secondary {
    background: transparent;
    border: 1px solid #ccc;
    color: #666;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    display: block;
    margin: 0 auto;
}

.nickname-wrap {
    margin-bottom: 25px;
}
.nickname-wrap label {
    display: block;
    font-size: 0.95rem;
    color: #555;
    margin-bottom: 8px;
    font-weight: bold;
}
.nickname-wrap input {
    width: 100%;
    box-sizing: border-box;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    background: #f9f9f9;
}
.nickname-wrap input:focus {
    outline: none;
    border-color: #3498db;
    background: #fff;
}