.signup-form {
    max-width: 450px;
    margin: 40px auto;
    padding: 40px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

/* Header */
.signup-header {
    text-align: center;
    margin-bottom: 35px;
}

.signup-header h2 {
    font-size: 28px;
    font-weight: 700;
    color: #2c3e50;
    margin: 0 0 8px 0;
}

.signup-header p {
    font-size: 15px;
    color: #7f8c8d;
    margin: 0;
}

/* Input groups */
.input-group {
    margin-bottom: 24px;
}

.input-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 8px;
}

.input-group .required {
    color: #e74c3c;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border: 2px solid #e0e6ed;
    border-radius: 10px;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.input-group input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 4px rgba(52, 152, 219, 0.1);
}

.input-group input::placeholder {
    color: #bdc3c7;
}

/* Custom checkbox */
.checkbox-group {
    margin: 28px 0;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    user-select: none;
    position: relative;
}

.checkbox-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    cursor: pointer;
}

.checkmark {
    min-width: 22px;
    height: 22px;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    margin-right: 12px;
    background: #fff;
    transition: all 0.3s ease;
}

.checkbox-label input:checked ~ .checkmark {
    background: #3498db;
    border-color: #3498db;
}

.checkbox-label input:checked ~ .checkmark:after {
    content: '✓';
    position: absolute;
    left: 6px;
    top: 2px;
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.checkbox-text {
    font-size: 14px;
    color: #555;
    line-height: 1.5;
}

.checkbox-text a {
    color: #3498db;
    font-weight: 600;
    text-decoration: none;
}

.checkbox-text a:hover {
    text-decoration: underline;
}

/* Submit button */
.submit-btn {
    width: 100%;
    padding: 16px;
    font-size: 16px;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.submit-btn:active {
    transform: translateY(0);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .signup-form {
        margin: 20px;
        padding: 30px 25px;
    }
    
    .signup-header h2 {
        font-size: 24px;
    }
    
    .input-group input {
        padding: 12px 14px;
    }
}

@media (max-width: 480px) {
    .signup-form {
        margin: 15px;
        padding: 25px 20px;
        border-radius: 12px;
    }
    
    .signup-header {
        margin-bottom: 25px;
    }
    
    .input-group {
        margin-bottom: 20px;
    }
}